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PostPosted: Mon Nov 02, 2015 10:21 am 
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Joined: Thu May 13, 2004 8:05 am
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Location: Bedfordshire
Car Model: The TG 9000 Aero, Edna Aero...
For a quick road car, instead of using a 4.05, a hybrid box can be built using components form a 4.05 and 3.61 to give you an intermediate final drive ratio of circa 3.8 IIRC.


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PostPosted: Mon Jan 25, 2016 3:20 pm 
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Joined: Tue Jun 09, 2015 7:21 am
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Car Model: '97 Saab 9000 Aero
My Saab specialist is now rebuilding and strengthening the gearbox from the Hirsch car.
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We have found an interesting info on the ECU from the Hirsch car. The gearbox ratio is -5%, so I think the final drive is 3.82.
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He will also fitting a Quaife LSD, an Abbott lightened flywheel and a Sachs Performance pressure plate with Spec Stage 2+ Clutch.


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PostPosted: Mon Jan 25, 2016 5:42 pm 
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Location: Halewood, Merseyside
Car Model: Saab 9000 Aero
Iirc my box I built was a 4.05 and I fitted 9/5 5th gear cogs which takes it to 3.82, at 3000rpm it's at 85mph instead of 90 with a 3.61 and factory fitted 5th gears.

Interested to see what strengthening mods he does cos there isn't any bushes in the box?


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PostPosted: Mon Jan 25, 2016 7:05 pm 
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Location: Aberdeen
Car Model: 2008 TTiD Aero
Nelliem wrote:
Interesting - I wasn't aware that Hirsch did anything with 9000's at all , sure I've never seen any Hirsch bits for a 9k.


Duck 89's 9000CD has a hirsch 3" exhaust on it from memory


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PostPosted: Fri Jan 29, 2016 6:48 am 
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Location: Saabshire
Car Model: Merc A200d AMG 7sp DCT
Nelliem wrote:
Interesting - I wasn't aware that Hirsch did anything with 9000's at all , sure I've never seen any Hirsch bits for a 9k.


The 9000 was the first car Hirsch did.
We used to fit ECU's, Gearbox upgrades, and exhausts.

I remember doing the ECU's on some 2.0t cars brand new. And they were quicker than 9000 Aero's of the time.

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PostPosted: Fri Jan 29, 2016 3:00 pm 
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Joined: Tue Jun 09, 2015 7:21 am
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Car Model: '97 Saab 9000 Aero
Here are still some infos from the old website:
https://web.archive.org/web/20010302073359/http://www.hirsch-performance.ch/english/zubehoer.htm (see "performance")

I also have the flyer from the Aero Step 1 tuning.
http://www.uksaabs.co.uk/UKS/download/file.php?mode=view&id=72166


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PostPosted: Thu Feb 04, 2016 8:06 am 
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Car Model: '97 Saab 9000 Aero
The gearbox rebuild is in progress. All new bushes and bearings. There are no strengthening mods visible.


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PostPosted: Fri Jul 12, 2019 6:24 am 
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Car Model: '97 Saab 9000 Aero
Nelliem wrote:
Do you know anything more about the Hirsch box? I've never heard of these before.

Yesterday I finally saw a Hirsch box in a 1997 Aero with ratio i=3.82


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PostPosted: Sun Jul 14, 2019 6:33 pm 
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SaabDotNet wrote:
Nelliem wrote:
Do you know anything more about the Hirsch box? I've never heard of these before.

Yesterday I finally saw a Hirsch box in a 1997 Aero with ratio i=3.82

Many years ago during one of what turned out to be many rebuilds on my 9000 Aero's gearbox, Abbott Racing fitted a 3.82:1 final drive to mine and fitted a plate carrying their serial number and "i=3.82" on it. It's a very long time ago now but I don't think it lasted very long.

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