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PostPosted: Sun Oct 10, 2021 8:33 am 
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Arkwright.
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Joined: Sat Jan 20, 2007 6:33 pm
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Location: NETTLEHAM, LINCOLNSHIRE
Car Models: 1981 99 Turbo & 1985 90 5spd + Jaguar XF 250 S/brake & FIAT 500 TwinAir
Excellent write up as always Jools 8)

If i'd known you were playing locally I would have popped out to say hello :D

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PostPosted: Sun Oct 10, 2021 8:57 am 
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Joined: Sun May 21, 2006 11:18 pm
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
Car Models: OLD SAABS,VOLVOS&VW...
BillJ wrote:
BIRDIEMANGO wrote:
YOU CAN SEE THE 'MINTEX' PADS ON THE LEFT, START TO DISINTEGRATE WITH THE HEAT,BREAKING UP.....

Which answers my question above, then. Vented discs should keep the heat down a bit more and therefore give the pads an easier time.


I AM NOT SO SURE, HERE 'BILLJ'?

BOTH THE CLARION 99 TURBO,AND THE K900 HAVE THE FRONT BRAKE DISC HEAT SHIELDS REMOVED....FOR EXTRA COOLING.

BRAKE PAD 'BREAK-UP'ON THE 99 TURBO WAS NOT AN ISSUE,EVEN IN MUCH WARMER AMBIENT TEMPERATURES? SAME TRACK,SAME BRAKE SET-UP, ALTHOUGH THE 99 TURBO DOES HAVE DIRECT AIR DUCTING,FROM THE FRONT SPOILER APERTURES DIRECTED ONTO THE IINER SIDES OF THE SOLID FRONT BRAKE DISCS. :idea:

YES,THE VENTED DISC SET UP,WOULD CERTAINLY ASSIST IN HEAT DISSAPATION.

BUT,FIRST I WILL TRY A HARDER COMPOUND PAD,TO SEE WHAT HAPPENS....WITH THE SOLID FRONT DISCS?

CERTAINLY, ON THE 'WORKS' 99T RALLY CARS,FRONT PAD&DISC CHANGES WERE PART OF THE SERVICE HALT SCHEDULE,EVEN WITH THE MODIFIED SET-UP THAT SAAB ADOPTED,FROM STANDARD.

REGARDS '99 PETE' MENTIONING ABOUT THE MOBIL TURBO CHALLENGE CARS? I WAS LUCKY ENOUGH TO ACQUIRE THE PADDLE TYPE CLUTCH ASSEMBLY,FROM ONE OF THE ORIGINAL K900 RACE CARS, A FEW WEEKS AGO.THIS IS CURRENTLY BEING SEN'T OFF TO BE REFURBISHED AND RE-LINED. :wink:

I ALSO HAVE THE ORIGINAL ROLL CAGE(SAFETY DEVICES) FROM ONE OF THESE CARS......WHICH WHILST NOT SUITABLE FOR 'MODERN DAY' MOTORSPORT COMPETITION,IS PERFECTLY SUITABLE FOR TRACKDAY APPLICATIONS. I AM ASSURED THAT 'TIFF NEEDELL' HAS HAD, HIS HAND WRAPPED AROUND THE UPPER ROLL BAR,FROM BACK IN THE DAY. :wink:


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PostPosted: Sun Oct 10, 2021 9:04 am 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
Car Models: OLD SAABS,VOLVOS&VW...
ANOTHER ISSUE ALLEGDLY SUFFERED BY THE MOBIL SAAB TURBO CARS,WAS THE MELTING OF THE LOWER BALLJOINT RUBBER GAITERS?
I TO HAD SUFFERED THE SAME FATE,ON THE NEARSIDE :shock: SO MUCH SO,THAT THE JOINT NOW HAS PLAY IN IT!! IT WAS 'BRAND NEW' NOT 1500 MILES AGO...
IT GOT BINNED,AND THE BETTER 'CAST' TYPE OF BALLJOINT FITTED.

YESTERDAY,WAS ALSO THE FITTING OF SOME NEW FRONT TRW/LUCAS DISCS,AND THIS TIME STANDARD 'FERODO' PADS,TO SEE IF THE 'BITE' IS ANY DIFFERENT FOR ROAD USE?

I THINK THAT NEARSIDE BRAKE DISC? IS NOT MUCH USE ANYMORE :roll: :lol: :shock:


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PostPosted: Sun Oct 10, 2021 9:19 am 
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Espin99T wrote:
Excellent write up as always Jools 8)

If i'd known you were playing locally I would have popped out to say hello :D


MORNING MAL,

AFTER THE NIGHT SPENT SLEEPING IN THE CARS,WHILST THE WIND&RAIN POUNDED ON THE WINDOWS? THEN A FULL DAY BEHIND THE WHEEL OF THE CARS,ON TRACK?(REMEBER,AN AVERAGE CAR RACE IS AROUND 20-30 MINS) :loco:

IT WAS DECIDED,THAT A STAY OVERNIGHT NEARBY 'CADWELL PARK' WAS IN ORDER? BUT......

WE NEEDED SOMEWHERE TO SAFELY PARK UP THE CARS,AS WELL?

AFTER YEARS SPENT,FINDING ACCOMODATION,IN THE REMOTEST PARTS OF SCANDINAVIA& IN ALL SEASONS?

I MANAGED TO FIND A SUITABLE LOCATION,IN THE FORM OF A LARGE 'BELL TENT' WITH PARKING IN A FIELD,AND FIREPIT,BBQ FACILITES AND TOILETS/SHOWER (NOT TOO FAR AWAY FROM YOU MAL) IN 'BULLINGTON'......

IT WAS A WISE DECISION,WITH THE EVENING FIRE LIT,BURGERS AND SAUSAGE ON THE BBQ EARLY EVENING,WE HAD AN EARLY NIGHT.......ALLOWING US TO DRIVE HOME REFRESHED ON THE SATURDAY MORNING.OVER A 500 MILE ROUND TRIP,INCLUDING TIME ON-TRACK.


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PostPosted: Sun Oct 10, 2021 9:26 am 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
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A FEW MORE PHOTOS FROM ON THE DAY..... TRYING TO KEEP UP WITH OUR TOYOTA MR2,AND KEEP THE MGZR BEHIND....


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PostPosted: Sun Oct 10, 2021 9:27 am 
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Location: NETTLEHAM, LINCOLNSHIRE
Car Models: 1981 99 Turbo & 1985 90 5spd + Jaguar XF 250 S/brake & FIAT 500 TwinAir
BIRDIEMANGO wrote:
Espin99T wrote:
Excellent write up as always Jools 8)

If i'd known you were playing locally I would have popped out to say hello :D


MORNING MAL,

AFTER THE NIGHT SPENT SLEEPING IN THE CARS,WHILST THE WIND&RAIN POUNDED ON THE WINDOWS? THEN A FULL DAY BEHIND THE WHEEL OF THE CARS,ON TRACK?(REMEBER,AN AVERAGE CAR RACE IS AROUND 20-30 MINS) :loco:

IT WAS DECIDED,THAT A STAY OVERNIGHT NEARBY 'CADWELL PARK' WAS IN ORDER? BUT......

WE NEEDED SOMEWHERE TO SAFELY PARK UP THE CARS,AS WELL?

AFTER YEARS SPENT,FINDING ACCOMODATION,IN THE REMOTEST PARTS OF SCANDINAVIA& IN ALL SEASONS?

I MANAGED TO FIND A SUITABLE LOCATION,IN THE FORM OF A LARGE 'BELL TENT' WITH PARKING IN A FIELD,AND FIREPIT,BBQ FACILITES AND TOILETS/SHOWER (NOT TOO FAR AWAY FROM YOU MAL) IN 'BULLINGTON'......

IT WAS A WISE DECISION,WITH THE EVENING FIRE LIT,BURGERS AND SAUSAGE ON THE BBQ EARLY EVENING,WE HAD AN EARLY NIGHT.......ALLOWING US TO DRIVE HOME REFRESHED ON THE SATURDAY MORNING.OVER A 500 MILE ROUND TRIP,INCLUDING TIME ON-TRACK.


I know the site, its just 10 minutes from my place :D

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PostPosted: Sun Oct 10, 2021 9:30 am 
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WITH GROUND CLEARANCE AT JUST 85MM :shock: YOU CAN SEE THE FULL COMPRESSION,ON THE SUSPENSION IN HARD CORNERING....


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Xtreme Sports Photography - Christina  (934)A.jpg
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PostPosted: Sun Oct 10, 2021 9:40 am 
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BIRDIEMANGO wrote:
SAME BRAKE SET-UP, ALTHOUGH THE 99 TURBO DOES HAVE DIRECT AIR DUCTING,FROM THE FRONT SPOILER APERTURES DIRECTED ONTO THE IINER SIDES OF THE SOLID FRONT BRAKE DISCS. :idea:

I don't think you would have gone to that trouble on the 99 if you hadn't thought it would make a difference so perhaps that's got something to do with it.
I know you say you don't need motorsport pads on a road-going car but I used DS2500 on my 9000 Aero when I was doing track-days in it and found that while they needed heat to really shine, they still gave noticeably better bite than standard pads when stone-cold so I was quite happy to leave them in all the time.
Your 900 brakes are exactly the same in that they have pads, a caliper and a disc, with absolutely no other similarity to my 9000's brakes of course :lol:

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PostPosted: Sun Oct 10, 2021 12:05 pm 
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Joined: Sat Jul 01, 2017 10:52 am
Posts: 146
Location: Suffolk
Car Models: Saab 99 turbo
Thanks Julian, that was spot on.
The links work well too, no problem at all. Using them I can see that my preferred choice of DS2500 are available for the Fords, so a little bit of careful adaptation and I will have what I really want. I look forward to hearing how you get on with your standard Ford pads too.

Friends of mine use DS3000 front and DS2500 rear on their trackday clios/ turbo clios to very good effect. They tell me they are the best pads they have used for this, the only downside being how expensive they are.

Incidentally, I have seen a statement from Ferodo advising that these pads (DS2500 at least), should not be used with drilled and / or grooved discs, as this reduces the life of the pads significantly and can have a detrimental affect on the discs too. Something to keep in mind.

I currently have EBC Greenstuff on my 99t and whilst they are an improvement over the standard pads I know I can do better, hence the DS2500s.


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PostPosted: Mon Oct 11, 2021 9:58 am 
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Location: Near Liverpool
Car Models: Saab 900 and 99
About 5 years ago I was looking for some better brake pads for my 99, I was looking at mk2 escort pads too, because of the limited choice for early Saab pads. I contacted Carbotech and explained the situation regarding pads for these cars, I was told there was no need to buy mk2 escort pads because they have the correct Saab pad shape in their system. I ordered a set in their 1521 'bobcat' compound, mainly because of its low temperature operating range and low dust.
The two main factors for me with pads on road cars is the 'from cold' braking and low dust. There is always an overlap when going up to the next compound and it depends on the primary use of the car.

http://carbotech-europe.com/compoundstechnical.html

Julians 900 was on standard pads and although they worked well, they didn't last long and as they wore, heat at the pad was becoming an issue, that heat has to go somewhere. Better brake pads is the obvious answer to give more time on the track and eliminate coming back in to change pads. Then the issue of retaining that heat at the pad/disc may well appear again and start boiling brake fluid, hopefully it will be fine with just the uprated pads, the next trackday will tell, if not, whats next, RBF brake fluid, titanium pad shims or put those T16 vented brakes he got from me? Or maybe just change everything. Then maybe he could have full track sessions, no brake fade, brake later as well.

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PostPosted: Tue Oct 12, 2021 6:01 pm 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
Car Models: OLD SAABS,VOLVOS&VW...
THANKS FOR THE LINK TO 'CARBOTECH',I HAVE BEEN IN TOUCH WITH THEM.....

FOR MOTORSPORT COMPOUNDS,IN EITHER XP10 OR XP 12,THIS WAS THE REPLY?

1986 Saab 900 Turbo 8v Front pads as Mintex 1581 in XP10 are £195+vat & delivery

1986 Saab 900 Turbo 8v Front pads as Mintex 1581 in XP12 are £210+vat & delivery

UK delivery for most areas is £12+vat

NOW WE HAVE TO CONSIDER HERE ''ARE WE GOING TO WIN ANY RACES''

THE ANSWER I AM AFRAID IS SADLY,NO.

THE WHOLE POINT OF THIS THREAD,IS TO DEMONSTRATE THE CAPABILITIES,OF AN OLD 1986 8 VALVE SAAB TURBO, THAT WAS RESCUED FROM BEING SCRAPPED.

I COULD SEE THE POTENTIAL WITH THE OLD K900,OF IT BECOMING AN EVERYDAY CLASSIC TO USE AND ENJOY? AND ALSO PARTICIPATING IN A BIT OF 'GRASSROOTS' MOTORSPORT,OTHERS MAYBE NOT SO MUCH?

THE REASON FOR THIS,WAS THE EVER ESCALATING COST'S OF COMPETING WITH THE 'CLARION 99 TURBO',AND ASSOCIATED INSURANCE FEE'S SHOULD THE 99 TURBO GET BENT? :oops: AFTER ALL,IT HAS PROVED ITSELF ON SEVERAL OCCASIONS,AMIDST STRONG OPPOSITION,IF FULL-ON MOTORSPORT COMPETITION,ON COMPLETLEY STANDARD BRAKE PADS....

THE K900,IS ALSO ALLOWING ME TO SEE HOW THE(NOW SOMEWHAT ANCIENT!) 'APC' SYSTEM,IS ALLOWING THE 'BOOST' CHARACTERISTICS TO OPERATE,UNDER FULL 'TEST' CONDITIONS,WITH DIFFERING FUELS,AND OCTANE BOOSTERS.

IT 'HAS' HOWEVER HIGHLIGHTED THIS ISSUE WITH THE FRONT BRAKE PADS,SO IT MUST BE DEALT WITH...AND IT WILL BE.

NOW WE 'KNOW' IT IS AN ISSUE? THEN COLD AIR DUCTS WILL FASHIONED,AND DIRECTED AT THE INNER FRONT DISC FACES....

HOWEVER,IT MUST BE REMEMBERED,AT ALL TIMES THAT 'CLUBMAN' MOTORPSPORT IS THERE TO TAKE PART IN? THEREFORE ANY ASSOCIATED COST'S INVOLVED HAVE TO BE CAREFULLY CONSIDERED,AND ANY FACTORS THAT AFFECT THE RELIABILTY OF THE CAR ITSELF? MUST BE ADDRESSED,WITH AN ENGINEERING MIND......

I SHALL WAIT,FOR THE STANDARD 'FORD' TYPE PADS,TO TURN UP,AND ASSESS THEIR SUITABILITY FOR ADAPTION INTO THE SAAB FRONT CALIPERS. 'IF' THEY ARE SUITABLE,THEN PERHAP'S I WILL GO DOWN THE ROUTE OF THE 'YELLOWSTUFF' ESCORT MK2/CAPRI PADS...AT AROUND £65 PER SET.

MEANWHILE,THIS WEEKEND THE K900 IS ABOUT TO HIT THE 'ROLLING ROAD'......THE SAME ONE, I HAVE BEEN USING FOR YEARS.

DON'T BE EXPECTING ANY 'MAGIC' FIGURES :roll:

THIS THING WAS ONLY 155 BHP,BRAND NEW....AND THAT WAS OVER 35 YEARS ,AND 131,000 MILES AGO....

THING IS,NOBODY SEEM'S TO BE CAMPAIGNING 'SAAB'S IN MOTORSPORT MUCH ANYMORE? AND MANY PEOPLE OF THE MODERN GENERATION,HAVE NEVER EVEN SAT IN(A REAL SAAB) ONE?

SO, WHY BOTHER? BECAUSE I 'COULD' DRIVE ANY CAR I WAN'T.......?

NOWADAYS,3-400 BHP IS THE NORM,FOR A 'SPORTY' FAMILY SALOON.....STRAIGHT OUT OF THE SHOWROOM.

BUT THAT'S ALL ECU'S,TRACTION CONTROL,AND ENGINE'S THAT ARE PRETTY MUCH RACE-READY FROM THE FACTORY......

MAYBE I AM 'TOO' OLD SKOOL? BUT? THATS HALF THE FUN,OF TAKING SOMETHING THAT'S PAST IT'S BEST.......TURNING IT INTO ,SOMETHING ELSE,THAT PEOPLE ARE JUST NOT EXPECTING......

JUST BECAUSE.....

I CAN :wink:

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PostPosted: Tue Oct 12, 2021 6:05 pm 
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Car Models: 1981 99 Turbo & 1985 90 5spd + Jaguar XF 250 S/brake & FIAT 500 TwinAir
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REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988

And long may it continue :wink:

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PostPosted: Thu Oct 14, 2021 5:27 am 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
Car Models: OLD SAABS,VOLVOS&VW...
ALTHOUGH THEY MIGHT HAVE HAD THE EDGE ON THE LONGER STRAIGHTS?

HERE ARE A FEW MORE PICS(CLICK TO ENLARGE)OF EXACTLY HOW HARD THE 'MR2' AND THE 'MGZR', BOTH ON SEMI-SLICKS,WERE BEING PUSHED IN THE BEND'S BY THE OLD K900 BEHIND, ON THE ROAD-GOING BRIDGESTONES........


HOWEVER,PUSHING THE OLD SAAB TO IT'S ABSOLUTE LIMITS,ON TRACK?

THE 'ELECTRIC DRIVERS WINDOW HAD 'JAMMED' DOWN IN THE PADDOCK,AT LUNCH :roll: AND THE REMOVAL OF THE DRIVERS DOOR TRIM,AND A HEFTY WHACK WITH A HAMMER,THE MOTOR DECIDED TO WORK AGAIN.
ONCE THE WINDOW WAS BACK UP,THE FUSE WAS REMOVED..... :wall: :lol:

THE K900 'MANUAL' SLIDING SUNROOF,NOW A WELCOME BENEFIT TO 'FLING' OPEN ON THE 'COOLDOWN' LAP,TO GET SOME FRESH AIR,INTO THE CABIN..... :wink:


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PostPosted: Thu Oct 14, 2021 5:49 am 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
Car Models: OLD SAABS,VOLVOS&VW...
LAST WEEKEND,I DECIDED ENOUGH,WAS ENOUGH.......

I HAVE AN 'AVERSION' TO ALL THINGS 'ELECTRICAL' ON A MOTOR CAR,WHENCE PREVIOUSLY A 'MECHANICAL' DEVICE DID EXACTLY THE SAME TASK? ONLY MORE RELIABLY? HENCE THE ELECTRIC SUNROOF GETTING REMOVED!

TWO MANUAL WINDOW REGULATOR MECHANISM'S WERE 'STOLEN' OUT OF A COUPLE OF SLIGHTLY EARLIER 99 DOOR'S I HAD? CLEANED UP,AND LUBRICATED WITH PLENTY OF OIL&GREASE?

THESE ARE A 'STRAIGHT' SWAP FOR THE K900 ELECTRIC WINDOW REGULATOR SET-UP,AND THE HOLES ARE ALREADY PRESSED OUT,IN THE K900 DOORS FOR THEM,TO JUST 'BOLT IN' .....

THE ONLY 'ADAPTION' WAS TO CAREFULLY MARK THE REAR OF THE UPHOLSTERED ' HARDBOARD' THAT SURROUNDS THE BLACK PLASTIC 'INNER DOOR' PULL HANDLE? THEN USE A 25MM HOLE CUTTER TO ALLOW THE MANUAL 'WINDOW WINDER' TO POKE THROUGH THE HOLE....

THAT'S LOST US ANOTHER COUPLE OF KILOGRAMMES :lol:


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PostPosted: Sun Oct 17, 2021 6:32 am 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
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MORNING CHAPS,

THERE ARE SOME THINGS I AM UNABLE TO DO,AS I DON'T HAVE THE SPACE,TIME OR NECESSARY EQUIPMENT. ONE OF THOSE IS A 'DYNAMOMETER'.
ARRIVING AT THE 'ROLLING ROAD' YESTERDAY MORNING, SOMETHING AS USUAL? RATHER 'INTERESTINGLY' WAS CURRENTLY BEING WORKED ON.......

LAST TIME IT WAS A 'LAMBORGHINI JALPA' :corn:

THIS TIME........

I WOULD HAVE ONE OF THESE OVER A MK2 ESCORT, ANYDAY...... 8)


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PostPosted: Sun Oct 17, 2021 6:46 am 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
Car Models: OLD SAABS,VOLVOS&VW...
AROUND AN HOUR,WAS SPENT STRAPPING THE OLD K900 DOWN TO THE FLOOR,WITH VARIOUS CONNECTIONS AND WIRING ALL PLUGGED IN? THE FINAL STAGES OF PREPARATION,BEING THE MOST IMPORTANT......

A SET OF HEADPHONES,THAT DETECT EVEN THE SLIGHTEST ENGINE 'KNOCK',OR 'PINKING' (IN LAYMAN'S TERM'S) ARE WORN INSIDE THE CAR....

BUT BEFORE WE DID ANY 'RUNS'? MY MOST AMICABLE 'DYNO MAN' WHOM IS NOW 59 YEARS OF AGE,WAS JOINED BY HIS FATHER(WHOM IS STILL MECHANIC-ING!AT HIS AGE, IN THE GARAGE) AND A COUPLE OF MUGS, OF HOT TEA........

IT WAS AFTER ALL 10.30AM,ON A SATURDAY MORNING....! SO WE HAD A RARE OPPORTUNITY,TO HAVE A CHAT FOR A WHILE,REGARDING HOW THE 'MOTOR TRADE' HAS CHANGED OVER ALL THESE YEARS... :roll: :wall: :haynes:

THEY HAVE ALSO(NOW) TAKEN ON AN 'APPRENTICE' FROM THE LOCAL COLLEGE,WHERE HE HAS SPENT THE LAST 3 YEARS,ON A MECHANICS' COURSE?

THE YOUNG LAD SAY'S HE HAS LEARNT MORE,IN THIS WORKSHOP IN THE LAST 5 MONTHS....THAN HE EVER DID AT 'COLLEGE' :wink:


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PostPosted: Sun Oct 17, 2021 7:47 am 
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Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
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ONLY GETTING THE K900 ACTUALLY ON THE 'ROAD' BACK IN JUNE, OF THIS YEAR...? IT HAS HARDLY BEEN A 'STROLL IN THE PARK'.

AT IT'S FIRST COMPETIVE 'SPRINT' EVENT,ALTHOUGH IT WAS RUNNING WELL? IT WAS NOTICED ON THE FINAL RUN,AROUND THE CIRCUIT? BY BOTH OF THE WELL-EXPERIENCED 'SAAB' AFICIONADO'S,WHOM HAD COME ALONG TO HELP OUT AND SPECTATE? THAT 'AUDIBLE' ENGINE 'KNOCK' WAS OCCURING DOWN THE BACK STRAIGHT,AT THE 3 SISTERS CIRCUIT.

THE SUBSEQUENT DROP DOWN TO 'BASE BOOST'(AROUND 4 PSI)SOON FOLLOWED? THE ELUSIVE CAUSE?

WAS LATER IDENTIFIED AS THE 'FAILED' KNOCK SENSOR,WHICH HAD LITERALLY FALLEN APART, AFTER ALL THESE YEARS....
I HAVE NEVER HAD ONE OF THESE FAIL LIKE THIS BEFORE? AND IT WAS CERTAINLY,A 'LAST PORT OF CALL',IN TRYING TO DIAGNOSE THE ISSUE? NOT HELPED BY THE FACT,THAT IT IS BURIED UNDER THE INLET MANIFOLD,WITH PIPES,HOSES AND YEARS OF OIL&CRUD DOWN THERE...

NEXT UP,WAS THE RUN UP THE HILL AT 'PRESCOTT' SAAB FESTIVAL? AS A LAST MINUTE 'FIX' THE 'ABBOTT RACING' ALLOY BLEED VALVE HAD BEEN FITTED,SO AT LEAST WE HAD SOME GUARANTEED BOOST AROUND 10 PSI, WITH THE 'COLD START VALVE' BEING USED AS A 'FIFTH NJECTOR',THERE WAS NO AUDIBLE 'PINKING' UP THE HILL,OVER ALL 3 RUNS..


LATER ON THAT WEEK,IT WAS SIMPLY A CASE OF RUMMAGING IN ONE OF THE CHICKEN SHEDS,TO FIND A REPLACEMENT 'KNOCK SENSOR' AND SOME 'SPARE' APC VALVES& 'SOMEWHAT' RESTORE BOOST& THE 'APC' SYSTEM AGAIN.....

AT THIS POINT,I ALSO FOUND ANOTHER MATCHING USED 'WARM UP REGULATOR'?
THE 'WUR' THAT WAS CURRENTLY ON THE CAR,HAD THE SECURING BOLTS SEIZED SOLID! AND EVEN WITH THE ENGINE 'HOT',BOTH 'ALLEN KEY' BOLTS SIMPLY SHEARED OFF!
SO YET AGAIN,IT WAS A CASE,OF FINDING A DECENT 'USED' THERMOSTAT HOUSING TO SWAP OVER,ALONG WITH THE THERMO-TIME SWITCH AND COOLANT TEMP.SENSOR....JUST, SO I COULD TRY ANOTHER 'WUR'.

THIS IS EASIER 'SAID THAN DONE' THESE DAYS? AS THE ORIGINAL THERMOSTAT COVERS,HAVE A HABIT OF SHEARING THE RETAINING BOLTS,INTO THE THERMOSTATS HOUSINGS AS WELL.....

OF COURSE,ALL CAN BE DRILLED OUT? AND EITHER A NUT&BOLT ARRANGEMENT OR HELI-COILING ,CAN BE UTILISED TO RESTORE THE THREADS? BUT, IT IS ALL VERY TIME-CONSUMING WORKING ON OLDER CARS...VERY SELDOM IS IT? A 'TWO MINUTE JOB'.

IT MUST BE REMEBERED THAT THESE 99/K900 ARE REALLY GETTING ON NOW.....TIME TAKE'S IT'S TOLL,BUT THE BEST WAY ,TO REVEAL ANY RUNNING ISSUES IS 'ON TRACK'....

AND SO TO 'CADWELL PARK', RELENTLESSLY POUNDING THE K900 AROUND THE CIRCUIT,WITH SUPER-UNLEADED&OCTANE BOOSTER.... THE 'APC' SYSTEM,SEEMINGLY DOING IT'S STUFF?

I HAD SUSPECTED,THAT 'ADEQUATE' FUELLING UNDER LOAD, MAY BE AN ISSUE? POSSIBLY THE 'WUR' AT FAULT? HENCE THE 'COLD START INJECTOR' BEING WIRED UP,AS A RATHER CRUDE FIFTH INJECTOR...

THE 'WUR' IS CERTAINLY NOT, DOING IT'S 'WARM UP CYCLE' VERY EFFECTIVELY.....BUT THE K900 STARTS AND RUNS ,AND IDLE'S WELL,SO FOR THE LAST FEW MONTHS,IT HAS BEEN A CASE OF KEEPING IT RUNNING,TO ENJOY OVER THE SUMMER....

REGARDS POSSIBLE 'FUELLING ISSUES' THIS WAS SOMEWHAT EVIDENT,AS A NOTICABLE 'SURGE' IN BOOST,WHEN THE COLD START VALVE IS 'MANUALLY' ACTIVATED,WHILST DRIVING ON THE ROAD.

ALTHOUGH,I HAD COMPLETELY FORGOTTEN TO 'ACTIVATE' THIS(CRUDE FIFTH INJECTOR)ALL DAY AT 'CADWELL' :oops: AS THE K900 WAS RUNNING WELL,IN THE COOLER AMBIENT CONDITIONS.....AND WE HAD MORE IMPORTANT 'BRAKE' ISSUE'S TO WORRY ABOUT,OR RATHER THE 'LACK OF'.....?

I HAD ADJUSTED THE MIXTURE OVER THE LAST FEW MONTHS,ON THE K-JET FUEL DISTRIBUTION UNIT TO GIVE A 'LIGHT GREY' TAILPIPE,RATHER THAN A 'DARK TAN' COLOUR. THE 'DARK TAN' BEING THE IDEAL SHADE TO REPRESENT 'ECONOMY'......'LIGHT GREY' MORE-SO SLIGHTLY MORE RICH,ON THE MIXTURE......'DARK GREY' OR 'BLACK' BEING TOO RICH.

SO, WHAT WOULD THE 'ROLLING ROAD' REVEAL? REGARDS THE 'FUELLING'......?


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PostPosted: Sun Oct 17, 2021 8:39 am 
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Arkwright.
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Joined: Sat Jan 20, 2007 6:33 pm
Posts: 53608
Location: NETTLEHAM, LINCOLNSHIRE
Car Models: 1981 99 Turbo & 1985 90 5spd + Jaguar XF 250 S/brake & FIAT 500 TwinAir
As always Jools an excellent Sunday morning read, awaiting the next instalment :corn:

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PostPosted: Sun Oct 17, 2021 8:41 am 
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Joined: Sun May 21, 2006 11:18 pm
Posts: 4710
Location: REMAINING UNFAITHFUL TO FACTORY STANDARD SPECIFICATIONS SINCE 1988
Car Models: OLD SAABS,VOLVOS&VW...
VARIOUS FIGURES AND SPECS,BACK IN 1986 WHEN THE K900 T8 INTERCOOLER WAS 'BRAND NEW' OUT OF THE SHOWROOM?

153-155 BHP WAS STATED AS FLYWHEEL OUTPUT,ALONG WITH AROUND 173 LB.FT TORQUE.

BUT, WHAT WOULD A 131,000 MILE,35 YEAR OLD 900 TURBO 8 VALVE PUT OUT?

WE WOULD RUN THE CAR,ON JUST THE STANDARD K-JET SET UP TO BEGIN...

ON THE INITIAL FIRST RUN ON THE 'DYNO',THE 'AIR FUEL RATIO' COULD BE SEEN TO BE GOING FAR TOO LEAN?

THE 'RUN' WAS STOPPED,AS THERE IS ALWAYS THE POSSIBILTY,THAT ENGINE DESTRUCTION COULD OCCUR(HOLE IN PISTON ETC) DUE TO THE LACK OF ADEQUATE FUELLING.

ALTHOUGH I WAS QUITE PREPARED FOR US TO RUN THE K900,WITH THE 'APC' IN CONTROL,OF LIMITING 'BOOST' DUE TO ' ENGINE KNOCK' AND THE 'INADEQUATE FUELLING' ISSUE? AFTER ALL,IT HAD JUST DONE THIS ALL DAY AT 'CADWELL PARK'?

THERE WAS SOME DISCUSSION,AND OUR 'DYNO MAN' WAS HAPPY ENOUGH,FOR US TO CONNECT THE WIRING UP,TO THE 'COLD START VALVE' AND UTILISE IT AS THE 'FIFTH INJECTOR' BY FLICKING THE SWITCH INSIDE THE COCKPIT....? WE COULD THEN SEE FROM THE DATA,IF IT WAS SUPPLYING ENOUGH FUEL,TO 'MASK' THE 'AFR' DEFICIENCY?

THE FOLLOWING RUN,WOULD THERFORE BE CLOSELY MONITORED,TO SEE WHAT EFFECT THIS HAD ON THE 'AFR'? AND IF HE CONSIDERED IT 'SAFE' TO PROCEED?

HAVING THIS SET-UP,ALREADY WIRED UP ON THE 'CLARION 99 TURBO'...WE KNEW THAT IT WAS CRUDE,BUT EFFECTIVE,AND WAS ENOUGH TO GIVE THE 99 TURBO 180 BHP,AND 201 LB/FT TORQUE TEN YEARS PREVIOUS AND KEEP THE 'AFR' JUST A LITTLE ON THE RICH(SAFE) SIDE. HOWEVER, THE 'COLD START VALVE' ON THE 99 TURBO,IS OPERATED BY A 'CAM' ARRANGEMENT ON THE THROTTLE HOUSING,MICRO-SWICTHING A RELAY TO KICK-IN THE EXTRA FUELLING AT AROUND HALF THROTTLE.......

IT IS A LITTLE MORE COMPLICATED TO SET THIS UP,ON THE K900 WITH A WATER-HEATED THROTTLE HOUSING.THERE ARE LOT'S THING'S IN THE WAY,AND NONE OF THE HOLES ARE PRE-DRILLED IN THE CASTING.SO FOR NOW,THE 'COLD START VALVE' IS SIMPLY FIRED BY A SWITCH,MANUALLY IN THE COCKPIT.

AFTER SOME DISCUSSION,WITH OTHER 'FELLOW' SAAB NERD'S? IT WOULD SEEM THAT A VERY EARLY 16V THROTTLE HOUSING,SHOULD SUIT THE 8V K900,TO ALLOW THE FITTING OF SUCH A 'CAM OPERATED MICRO SWITCH' ARRANGEMENT? AND I MAY HAVE ONE OF THESE 'EARLY THROTTLE HOUSINGS' IN ONE OF THE SHEDS?

BUT, 'TIME' AS ALWAYS......?

NOW,IF YOU HAVE EVER EXPERIENCED THE SOUNDS,SMELLS AND VIBRATIONS OF YOUR CAR,WHILST IT IS ON THE 'ROLLING ROAD'? AND YOU ARE STOOD SAFELY,JUST FEET AWAY FROM THE EXHAUST...?

AS THE K900,STARTED TO BUILD BOOST, REVS EVER INCREASING,THE CACOPHONY OF NOISE..........THERE COMES A POINT,WHERE YOU REALLY DO THINK? IS IT ACTUALLY GOING TO BLOW UP!!!

YOU NEVER GET TO EXPERIENCE THAT SENSATION,WHEN YOU ARE RED-LINING THE ENGINE ON TRACK? AS THE EXHAUST,IS AT THE OTHER END OF THE CAR.

BUT? IT SOUNDS 8) GREAT....

166 BHP

171 LB/FT TORQUE

RUNNING A MAXIMUM OF 0.5 BAR BOOST,COLD START VALVE 'MANUALLY' ACTIVATED,WITH 'APC' SYSTEM

ANOTHER 3 RUNS FOLLOWED THIS,CONFIRMING THE RESULTS.


TIME,FOR ME TO SEND OFF THE ORIGINAL 'WUR' FOR REBUILD,AS WE SUSPECT THAT IS THE CAUSE OF THE LEAN 'AFR'.
BUT FIRST,I WILL RUN SOME TEST'S ON IT,TO SEE THE LINE PRESSURE'S ETC....DURING THE WARM UP CYCLE.THEN I HAVE A REFERENCE POINT.

THE GOOD NEWS BEING,I CAN STILL USE THE K900 WITH THE SPARE 'WUR' FITTED,THE 'APC' WILL KEEP EVERYTHING IN CHECK. AND IF I FANCY,A BIT OF EXTRA 'POWER', IT'S JUST THE FLICK OF A SWITCH.

IT WILL LIKELY BE 'SPRING' NOW BEFORE,I CAN TAKE THE K900 BACK UP TO THE 'DYNO' WITH IT'S NEWLY REBUILT 'WUR'........

THERE IS MORE TO COME,MUCH MORE.... :corn: :haynes:

JUST AN 'OLD' SAAB.


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