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The g50/31 Experience

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Old 10-03-2009, 11:16 AM
  #31  
Bill Verburg
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Originally Posted by schmidtwerk
Its the gears on the shaft rattling, the dual mass flywheel dampens the pulses from the engine crank, the single mass does not. The problem is even more pronounced with the proper RS mainshaft with the loose first and second gears rather than machined on the shaft as in the standard road cars. It is most obvious when lugging the car in any gear most in the lower gears.
That's all true but the factory set up the /30s in the Cups very loose, much more so than the /31 or /32 in the street cars. They all sound broke when brand new.
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Old 10-03-2009, 06:45 PM
  #32  
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Originally Posted by clubsport1
Joe, just out of interest, why did you choose the 31 over the 30 or 32?
Availability. Porsche had one g50/31 and two g50/33s "on the shelf." The gearing on the /30, /31, and /32 are all pretty close anyway. And all are overkill for me as this car is strictly a street car.

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Joe
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Old 10-03-2009, 06:47 PM
  #33  
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Originally Posted by schmidtwerk
Yes the RS is something special, even more so mental behind the wheel because you know its really something special. I'll trade it for the new Husaberg 570......or two. That bike is simply the best.
Jeff,

Are you in Southern or Northern Oregon. Seems like we should do some riding some time.

Cheers,
Joe
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Old 10-03-2009, 08:24 PM
  #34  
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Originally Posted by Bill Verburg
That's all true but the factory set up the /30s in the Cups very loose, much more so than the /31 or /32 in the street cars. They all sound broke when brand new.
I think that the CUP is worse yet based on my experience from the even lighter clutch disc and the increased vibrations not dampened by the even stiffer engine mounts.
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Old 10-03-2009, 08:25 PM
  #35  
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Originally Posted by boulderbobo
Thanks Jeff. So is there any damage being done?



Bob-
None at all.
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Old 10-03-2009, 08:26 PM
  #36  
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Originally Posted by jmarch
Jeff,

Are you in Southern or Northern Oregon. Seems like we should do some riding some time.

Cheers,
Joe
Portland, we ride the Coast range, however we are headed to China Hat east of Bend in November. Where are you located?
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Old 10-03-2009, 09:52 PM
  #37  
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Smile Another option that...
you can consider, change the Ring and Pinion....
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Old 10-04-2009, 01:39 AM
  #38  
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Joe,

Nice work! Now how about a spirited Rennlist drive to break it in?
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Old 10-04-2009, 04:00 AM
  #39  
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That is a good point with respect to the crown wheel & pinion. I have driven a 93 CS with G50/32 and 8/32 crown & pinion. It was absolutely frantic and probably no good for more than 130 mph.

Has anyone tried this mod using the standard US spec fitted gearbox ratios?....It would certainly make a difference, just no idea if it would be for the better.
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Old 10-04-2009, 04:13 AM
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Originally Posted by mike993c2s
Joe,

Nice work! Now how about a spirited Rennlist drive to break it in?
Good idea. What are you doing on 10/10?
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Old 10-04-2009, 04:21 AM
  #41  
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Originally Posted by clubsport1
Has anyone tried this mod using the standard US spec fitted gearbox ratios?....It would certainly make a difference, just no idea if it would be for the better.
I looked into this. Unfortunately, this will not fix the gaps between the ratios. Instead it will just move them to different speed ranges.

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Joe
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Old 10-04-2009, 12:53 PM
  #42  
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Originally Posted by clubsport1
That is a good point with respect to the crown wheel & pinion. I have driven a 93 CS with G50/32 and 8/32 crown & pinion. It was absolutely frantic and probably no good for more than 130 mph.

Has anyone tried this mod using the standard US spec fitted gearbox ratios?....It would certainly make a difference, just no idea if it would be for the better.
I have a pal that installed the Ring (Crown) and pinion recently, 16% lower than US Delivered factory specs. He is thrilled with the performance of the car. In the past several months, he has set 2 class records with the car. He is a good driver, but in his words, the R&P really "woke the car up."

I have my eye on this mod....cheaper than going through the gears too.
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Old 10-04-2009, 04:22 PM
  #43  
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That makes sense to me, even though there will still be gaps in the gears, I would have thought the revised cwp would reduce these?....
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Old 10-04-2009, 06:21 PM
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Originally Posted by clubsport1
That makes sense to me, even though there will still be gaps in the gears, I would have thought the revised cwp would reduce these?....
Nope, and the gaps are the real problem with a g50/20. No matter how high you rev the engine, the next shift will take you out of the powerband. That's why a different ring/pinion will not fix the problem.

Cheers,
Joe
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Old 10-04-2009, 07:41 PM
  #45  
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I put a 7:31 CWP in the 915 gearbox of my old 911. It definitely woke the car up, but as said above, the CWP does not change the relationship between the gear ratios -- it only lowers the complete gearstack.
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