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3.8 vs 3.6

 
Old 12-04-2018, 09:22 PM
  #61  
Spyerx
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Originally Posted by Bill Verburg View Post
What you want can be seen here, look at the red curves, compared to the blue. You want the red ones
Given I have a 5 speed and at this point not really wanting to invest in finding a 6spd + the full regear costs (know of a /30 for sale????) what compromise would I have to make? it seems with the /30 the split from 4-5 kept stock would be very long.

I know too many questions...
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Old 12-05-2018, 03:56 AM
  #62  
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Originally Posted by Spyerx View Post
Given I have a 5 speed and at this point not really wanting to invest in finding a 6spd + the full regear costs (know of a /30 for sale????) what compromise would I have to make? it seems with the /30 the split from 4-5 kept stock would be very long.

I know too many questions...
Are you maxing out fifth on the track? What if you kept first where it is and brought 234 and five down lower?

Last edited by Peteinjp; 12-05-2018 at 07:03 AM.
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Old 12-05-2018, 11:34 AM
  #63  
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Originally Posted by Peteinjp View Post


Are you maxing out fifth on the track? What if you kept first where it is and brought 234 and five down lower?
only 1 track here uses 5th so no, not even close i dont drive there much. But. I do like being at 3k cruising as it is a street car.
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Old 12-05-2018, 11:44 AM
  #64  
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Originally Posted by Spyerx View Post
Given I have a 5 speed and at this point not really wanting to invest in finding a 6spd + the full regear costs (know of a /30 for sale????) what compromise would I have to make? it seems with the /30 the split from 4-5 kept stock would be very long.

I know too many questions...
Here's a comparison of a stock 03 w/ 275/35 x18 tires, a /30 and 2 possible regears, opt 1 is se the /30 gears for 2, 3,4, the downside here is the big jump to 5. opt 2 is use /30 for 2,3,4 and the a 1:1 5th the down side here is higher cruise rpms. I added the range of each gear, this is something that would be useful to look at at to see how it matches w/ your local tracks. I'd also look into possible using a shorter tire, either a 285/30 or 265/35, It does depend on the track but in general I like what the shorter tires do.

Just from my own experience the /30 is a perfect transmission for a stock or moderately modified 3.6-3.8. The money gear on the track is 3, w/ 2 & 4 close enough to be useful, 5th is then there for the longer straights, only place I have ever used 6 is Monticello, It's got a Talladega like straight that ends in a 2nd gear switchback, very tough on the brakes
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Old 12-05-2018, 12:31 PM
  #65  
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Just bouncing in - of the tracks I run I get into 5th on a few (VIR, RA+). I pull around 5800 to 6000 in 5th on the back straight at VIR, depending on wind and exit from the Oak Tree (tight right turn)- low 3rd pull, but not worth going into second. This is the fastest track I run. I can see that I could drop 5th ratio lower, but because I do drive on street so prefer to hang on to the current ratio.
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Old 12-05-2018, 02:05 PM
  #66  
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Originally Posted by Gus View Post
Just bouncing in - of the tracks I run I get into 5th on a few (VIR, RA+). I pull around 5800 to 6000 in 5th on the back straight at VIR, depending on wind and exit from the Oak Tree (tight right turn)- low 3rd pull, but not worth going into second. This is the fastest track I run.
+1 The back stretch (and start/finish) are mega fast at VIR. 6000 in 5th at VIR in a 964 is pretty exciting... then on to rollercoaster where it gets even more exciting. Haven't been back in years. Love that place!



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Old 12-05-2018, 03:25 PM
  #67  
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If I go through Oak well enough I'll hit my rev limiter in 4th right before I need to brake at VIR on the back straight. With 275/35/18s that is a max speed of 140.xx. I don't use 5th gear w 275s....
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Old 12-05-2018, 06:37 PM
  #68  
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Here are some race only 964 gear stacks, most would be miserable on the street
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