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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Thu Oct 01, 2015 12:55 am Post subject: Motor mount cunnundrum |
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I'm building a '79 924 to run the Salt Flats in a naturally aspirated 2 liter class and find myself wondering if I need to upgrade the motor mounts to accomodate the targeted 225 HP we expect the new engine to generate.
The stock mounts look amazingly sound, but as I recall (before the tear down began last fall) the engine rocked noticibly when the trottle was blipped. What are the experiences out there with stock (especially old) mounts? And what manufacturers / models are recommended assuming I opt to replace?
Rick _________________ '79 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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Fasteddie313
Joined: 29 Sep 2013 Posts: 2596 Location: MI
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Posted: Thu Oct 01, 2015 1:21 am Post subject: |
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I believe stock motor mounts should take that power level just fine (in good condition), mine seem to.. _________________ 80 Turbo - Slightly Modified |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Thu Oct 01, 2015 2:37 am Post subject: |
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Or get a pair of these:
I have three sets of the fast-street and one set of the full-race versions in stock and ready to ship.
Click to purchase. _________________ erstwhile owner of just about every 924 variant ever made |
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Cedric
Joined: 27 Aug 2004 Posts: 2608 Location: Sweden
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Posted: Thu Oct 01, 2015 2:48 am Post subject: |
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The street ones would work well on your race car, torque response is much quicker than the stock squishy ones. I can't recommend the race ones, way to stiff even for a race car, ive tried both on my car. Even the street ones ads lots of vibrations.. _________________ 1980 924 Turbo
www.instagram.com/garagecedric/ |
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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Sat Oct 03, 2015 5:43 am Post subject: |
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ideola wrote: | Or get a pair of these:
I have three sets of the fast-street and one set of the full-race versions in stock and ready to ship.
Click to purchase. |
Given Cedrick's comment (below) on the harshness of the race units, would you recommend the street units? Bear in mind this is a race car and I really don't care if the mounts transmit vibration.
Rick _________________ '79 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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fiat22turbo
Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR
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Posted: Sat Oct 03, 2015 5:56 am Post subject: |
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Get the race ones for a pure race car, especially one that will live at WOT and high RPMs much longer than most of our street/race cars will.
Adding mixable polyurethane to the transaxle mounts can also help get power to the ground more efficiently and might reduce some strain on the torque tube, etc. _________________ Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Sat Oct 03, 2015 6:57 am Post subject: |
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If it's an all time race car and you don't care about vibration, get the race units. If you plan to spend any time on the street, get the fast street.
My $.02 _________________ erstwhile owner of just about every 924 variant ever made |
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Cedric
Joined: 27 Aug 2004 Posts: 2608 Location: Sweden
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Posted: Sat Oct 03, 2015 5:49 pm Post subject: |
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Like i said, the race ones are to stiff imo, things will only brake due to vibrations. The street ones are to stiff for a street car, especially since they seem to firm up a bit with time, imo opinion a better choice for a race car. Driveline response is very similar with both anyway, couldn't tell the difference on track.. _________________ 1980 924 Turbo
www.instagram.com/garagecedric/ |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
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Posted: Sun Oct 04, 2015 12:50 am Post subject: |
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They do seem they get harder over time (unlike the driver). _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Sun Oct 04, 2015 3:44 am Post subject: |
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ideola wrote: | If it's an all time race car and you don't care about vibration, get the race units. If you plan to spend any time on the street, get the fast street.
My $.02 |
Since you're the expert, I'll take the race units. Placing order for them....
Rick _________________ '79 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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