KoogiA17 wrote:
99 EMS wrote:
I have never had any issues at all with this set up, no fouling or rubbing at all.
I was wondering how it compared with Birdie's Clarion replica, as I have a quote from him that the 7.5J x 16 ET 30 Borbets left 5mm clearance in the rear arch.
THE WHEELS FITTED TO 'TURBO KILLER' ARE BORBET 'B', THE WHEELS I HAVE FITTED ON THE CLARION 99T,ARE
BORBET 'A'.
BOTH DESIGNS OF WHEEL ARE 16 INCH,BOTH ET30,BOTH 7.5J........
IN OVER TEN YEARS OF USING THE 'CLARION 99T' IN MOTORSPORT,AND ALSO 2500 MILES TO 'TROLLHATTAN' AND BACK,(FULLY LADEN,AT TIMES WITH FOUR ADULTS& A BOOT FULL) FITTED WITH THE ABOVE 'BORBET A',THE TYRES,(205 45 16 BRIDGESTONES)HAVE NEVER RUBBED THE ARCHES....OR, ANY SUSPENSION COMPONENTS.
INDEED,THE 'ISSUE' HERE,IS THAT 'INCORRECT' OFFSET, 'WILL' ALLOW THE FRONT TYRES,TO CONTACT THE FRONT ROAD SPRINGS,ESPECIALLY ON FULL 'DROOP'(CAR JACKED UP),GOING LOCK TO LOCK.
ON THE REAR,THE FIRST POINT OF CONTACT,WITH AN 'INCORRECT' OFFSET INNER WHEEL RIM,IS THE REAR SRING PAN...THIS CAN BE 'ADJUSTED' IN THE AFFECTED AREA,WITH A 'BALL-PEIN' HAMMER,TO GENTLY 'DISH' THE OFFENDING PROFILE OF THE REAR SPRING PAN, GIVE AN EXTRA FEW MM,OF THE REQUIRED CLEARANCE.
IT MUST BE BOURNE IN MIND,THAT BOTH TYRES,AND SUSPENSION COMPONENTS,IN USE IN 'MOTORSPORT' PLACE HUGE LOADS,ONTO SUSPENSION BUSHES,AND TYRE WALLS,SUCH THAT EVERYTHING MOVES,UNDER HARD CORNERING,ESPECIALLY ON TARMAC.
THE REAR 'TORQUE ARMS',THAT LINK THE AXLE TO THE BODY,ALSO SIT CLOSER TO THE ,INSIDE RIM OF THE 'BORBETS',WITH THE ET30 OFFSET,BUT NOT SO MUCH,THAT IT IS AN ISSUE...
THE LOWER THE TYRE PROFILE,THE LESS DISTORTION,OF THE TYRE WALL....
HOWEVER,AS YOU INCREASE THE 'FOOTPRINT' OF THE TYRE,NOT ONLY DOES IT GIVE AN ALMOST(INCONCIEVABLE) INCREASE IN GRIP, ROADHOLDING&BRAKING.THE ADDITIONAL LOADING ON THE 'WHEEL BEARINGS' ,AND THE DRIVETRAIN,IS ALSO INCREASED....(LESS FRONT WHEELSPIN,MORE CONTACT SURFACE AREA OF THE TYRE,ALONG WITH AN INCREASE IN THE CO-EFFICIENT OF FRICTION,WITH THE ROAD SURFACE).
TO ILLUSTRATE THIS,IN A MORE 'MODERN' SCENARIO.....?
REGARDS THE 'JAGUAR I-PACE', FOR EXAMPLE. WHICH WAS DESIGNED PURELY AS AN 'ELECTRIC VEHICLE'.
TO ACHIEVE 'MAXIMUM RANGE',ON THE BATTERIES,THE UNDERSIDE,OF THE 'BELLYPAN' OF THE CAR IS COMPLETELY FLAT,THE DOOR HANDLES RETRACT,AND PARTICULAR ATTENTION,WAS PAID TO THE AERODYNAMICS OF THE CAR,IN IT'S DESIGN.THIS IS RATHER CONVENIENT,TO HOUSE THE HUGE BATTERY PACK,UNDER THE VEHICLE FLOORING,TO LOWER THE PROFILE OF THE CAR,AND IT'S CENTRE OF GRAVITY.
LOW FRICTION TYRES,ALONG WITH AESTHETICALLY,AERODYNAMICALLY DESIGNED ALLOY WHEELS ARE FITTED.....
IF 'WE' CHOOSE,TO CHANGE THOSE WHEELS AND TYRES,FOR A LARGER DIAMETER,AND/OR WIDTH? THEN THE WIDER FOOTPRINT,AS IT PUSHES THROUGH THE AIR,GREATER 'CONTACT' SURFACE AREA,INCREASE IN FRICTION,WILL HAVE A NEGATIVE EFFECT ON THE GIVEN 'MILEAGE RANGE' OF THE VEHICLE.
WHILST TO THE DRIVER,AN INCREASE IN GRIP,THE 'STANCE' OF THE VEHICLE,AND IMPROVEMENT IN BRAKING/STOPPING,MAY BE EXPERIENCED.
BACK TO THE 99/C900 HOWEVER? THE REAR AXLE,CAN BE COMPLIMENTED BY THE USE OF FITTING THE C900 REAR ANTI-ROLL BAR (THROW THE FRONT C900 ANTI-ROLL BAR IN THE BIN!).
THIS STIFFENS THE REAR END CONSIDERABLY,ALLOWOING AN INSIDE REAR WHEEL TO KICK UP,UNDER HARD CORNERING,EFFECTIVELY LOADING THE OUTSIDE REAR TYRE,WHICH WILL THEN START TO BREAK TRACTION,OR SLIDE PROGRESSIVELY....
OF COURSE,I COMBINE THIS WITH LEFT-FOOT BRAKING,TO CHANGE THE DIRECTION OF THE CAR,ALWAYS TRYING TO KEEP THE FRONT WHEELS,IN STRAIGHT AHEAD POSITION........
AS OPPOSED TO 'NOT HAVING' THE REAR ANTI-ROLL BAR,WHICH ALLOWS MORE REAR BODY ROLL,TO THE POINT WHERE BOTH REAR TYRES,WILL SUDDENLY LOSE GRIP,WHICH IS A LOT MORE DRAMATIC,AND LESS PREDICTIVE TO THE DRIVER...GIVING SUDDEN SNAP-OVERSTEER.
OF COURSE SUSPENSION SET-UP AND GEOMETRY,IS MUCH A PERSONAL CHOICE.IT MAY,OR MAY NOT SUIT A PARTICULAR DRIVING STYLE.
40MM LOWERING SPRINGS,BILSTEINS ALL AROUND,THAT C900 REAR ANTI-ROLL BAR,COMBINED WITH THE 7.5J ET30 ,16 INCH BORBETS,205 45 16 BRIDGESTONES,GIVES THE 'CLARION 99T' SUPERB,PREDICTABLE ROAD HOLDING,IN BOTH THE DRY,OR THE WET...I DO HOWEVER,HAVE RUBBER SUSPENSION BUSHES,FITTED ALL ROUND,APART FROM THE SHOCK ABSORBERS,WHICH ARE POLYBUSHED,ALONG WITH THE LONGER REAR AXLE 'TORQUE ARMS',FROM A LATER CAR.
A FURTHER GEOMETRY SET-UP,WITH A CUSTOMISED SPIRIT LEVEL,AND SOME STRING,GAVE ME THE CAMBER&TOE SETTINGS THAT I REQUIRED..ON THE FRONT....
CURRENTLY,MUCH CAREFUL MEASURING IS TAKING PLACE,TO SEE IF I CAN RUN 9J 16 INCH BORBET 'A' 108 PCD,WITH AN OFFEST ET15,ON THE 'DEVILS PLAYGROUND' 99T, TO FILL THOSE HUGE FIBRGLASS ARCHES,YET KEEP THE INSIDE EDGE OF THE WHEEL RIM,JUST 5MM FROM THE SUSPENSION COMPONENTS...
YET,THE BIGGER,OR(HEAVIER) WIDER THE WHEEL AND TYRE? THE MORE LOAD WE EXERT ON THE SUSPENSION(AND STEERING)AND WE MUST TAKE THIS INTO ACCOUNT....
OR THAT 'SUPPOSED' INCREASE IN GRIP,AS WE GUN THE THROTTLE,MAY WELL TRANSLATE INTO UNSTABILTY,AT HIGH SPEED,OVER BUMPY TARMAC...WITH THE DAMPERS/SPRINGS(AND DRIVER) STRUGGLING WITH THAT EXTRA WEIGHT.
'MOTORSPORT' HIGH SPEED(CORNERING) &STABILTY,CAN BE COMPENSATED FOR SOMEWHAT,WITH FRONT CAMBER/CASTOR ADJUSTMENTS......GIVING INCREASED STEERING FEEDBACK,FASTER SELF-CORRECTION OF THE STEERING WHEEL,TO TRY AND HELP THE DRIVER,PARTICULARLY IN OLDER NON-POWER ASSISTED STEERING,SET-UPS,AS WITH THE 99.
ALLEGEDLY,THE FACTORY RALLY 99'S,ALSO HAD THE REAR AXLE,MODIFIED IN A JIG,TO GIVE 1 DEGREE,NEGATIVE CAMBER ALSO...AND I 'THINK' THEY DID THIS WITH THE 'MOBIL' RACE SERIES C900 T8,AS WELL.
SOME HAVE DEEMED IT NECESSARY,TO FIT AN ADJUSTABLE REAR 'PANHARD ROD',TO COMPENSATE FOR THE LOWERING OF THE SUSPENSION........
I HAVEN'T FELT THE NEED TO GO 'THIS' FAR YET....
INDEED IN IT'S CURRENT SET-UP,IT WAS ENOUGH TO ACHIEVE 21ST OVERALL,AND 2ND IN CLASS ON PART OF THE 'ISLE OF MAN'.... 'TT CIRCUIT'...ON ROAD TYRES,AGAINST CARS WITH FAR BIGGER ENGINES,WHICH WERE IN FULL RACE SPEC,ON SLICKS.
https://www.youtube.com/watch?v=KCWZ2d_ ... g&index=12 BUT THEN,WE START TO GET INTO THE REALMS OF THE UK MOTORSPORT 'BLUE BOOK',WHICH GIVES THE PARAMETERS,OF WHETHER SUSPENSION,PICK-UP POINTS CAN BE MOVED FROM ORIGINAL FACTORY SPEC,ADJUSTABLE LINK ARMS.......ETC.
NOW AT RISK,OF GOING TOO FAR 'OFF TOPIC',I HOPE THAT ANSWERS A FEW QUESTIONS,THE READERS MAY HAVE,ABOUT WHEELS,SUSPENSION GEOMETRY,ETC........ THAT, HAVE COME ABOUT?
WHILST 'TURBO KILLER' AND THE 'CLARION 99T',ARE VERY DIFFERENT IN THEIR POWER DELIVIRIES,AND BOTH DAVE AND I,DISAGREE OVER CERTAIN ELEMENTS,IN THEIR BUILD AND CONSTRUCTION? I SUPPOSE BOTH IN THEIR CURRENT STATE OF TUNE,GIVING SIMILAR POWER OUTPUTS,IT WOULD BE AN IDEA,TO 'PITCH' BOTH CARS,AGAINST EACH OTHER......?
BUT THEN,WE DID THAT ALREADY......
WHAT WE HAVEN'T DONE,IS TO TRY AGAIN,WITH THE CAR'S IN THEIR NEW 'STATE' OF TUNE....
IT MAY, TAKE A WHILE....
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