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4.08 or 3.90 gear questions...

Originally Posted by derraj06 Don't think you're going to get most of those posters to answer given how long ago this thread is from. To answer your question, the SRM

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Old 11-22-2017, 04:44 AM   #46 (permalink)
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Originally Posted by derraj06 View Post
Don't think you're going to get most of those posters to answer given how long ago this thread is from.

To answer your question, the SRM requires a re-calibration via ECUTEK or Uprev to consistently work with a 4.08 FD set.
Only issue I've had with SRM since going to 4.08 was it's off by like 200 rpm. Still works fine though
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Old 11-27-2017, 11:46 AM   #47 (permalink)
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Originally Posted by DeliriousClam View Post
Only issue I've had with SRM since going to 4.08 was it's off by like 200 rpm. Still works fine though
Track guys have had it randomly turn off. Being off by 200 RPM also isn't ideal. Shouldn't hurt a street car however.
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Old 04-06-2018, 12:44 AM   #48 (permalink)
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Did 4.08s on mine and SRM was totally off, very noticeable. and quite annoying. Blips were off by a fraction of a second and simply turned it off until Ecutek tune. Tune took care of it and it is fantastic. 4.08 makes it funner Maintaining the same driving style, my mileage dropped by 4/10s of a mile per gallon. Overall, a great mod for those staying N/A.
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Old 04-06-2018, 08:18 AM   #49 (permalink)
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So you can fix the SRM issue with Ecutek?


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Originally Posted by axmea? View Post
Did 4.08s on mine and SRM was totally off, very noticeable. and quite annoying. Blips were off by a fraction of a second and simply turned it off until Ecutek tune. Tune took care of it and it is fantastic. 4.08 makes it funner Maintaining the same driving style, my mileage dropped by 4/10s of a mile per gallon. Overall, a great mod for those staying N/A.
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Old 04-06-2018, 08:30 AM   #50 (permalink)
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So you can fix the SRM issue with Ecutek?
Yes.
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Old 04-06-2018, 11:09 AM   #51 (permalink)
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I don't have SRM, but after doing 4.08 install on my quaife I can honestly say, that's how these cars should come stock lol
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Old 04-06-2018, 11:18 AM   #52 (permalink)
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Big thing to keep in mind with gears, especially 4.08's is your gearing for and against you. At speeds over 90mph, you'd be in the same gears for a shorter amount of time. There would be 10, 14, and 18mph per gear that you are sacrificing to the next higher gear. For At those periods, the 3.69 will be more beneficial. The only way to get around this is compensate by rpm. So 4.08's really make sense if you can rev the engine to 8000-8250rpm. That implies that you have more aggressive cams, oil pump gears, ad damper at a minimum. It would also be recommended to replace your rod bolts and look into running a slightly stiffer valve spring on the VVEL side to prevent spring attenuation. That would make for a pretty Nasty NA Z, but costly. Anything over 8500 would need a new rotating assembly too.

On the track, 4.08's can be great for pulling out of a corner, but a PITA on the straights or high speed turn where you find yourself between the right gears.
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Old 04-06-2018, 01:34 PM   #53 (permalink)
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Coming from a 3.69 hands down I won't be coming back. I have a great street car and told Seb keep the old gear.
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Old 12-07-2019, 02:13 PM   #54 (permalink)
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Any one know the top speed of each gear in the manual 3.69 final drive? Trying to see where gear shifts occur of going to a 4.10
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Old 12-07-2019, 02:50 PM   #55 (permalink)
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Any one know the top speed of each gear in the manual 3.69 final drive? Trying to see where gear shifts occur of going to a 4.10
Look in my thread. It was posted by Mr. Squeeze. He compared 3.69 to 3.3. It is around page 100.
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Old 03-03-2020, 10:32 AM   #56 (permalink)
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Now that the MT Nismos come with 3.9 from the factory, has anyone had more experience with them? I'm on the 3.62 ratio with factory VSLD, and having a tough time deciding if it would benefit me.

Street car, 1/4 mile for the fun, and HPDE type of events
NA for the foreseeable future, N20 (nitrous) if I start chasing ETs at the strip
Daily now, but hopefully retired to weekend car by end of year
Wavetrac diff for planned upgrade
My driving makes MPG a somewhat moot point

Thoughts, everyone?
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Old 03-03-2020, 01:05 PM   #57 (permalink)
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Originally Posted by Dentt42 View Post
Now that the MT Nismos come with 3.9 from the factory, has anyone had more experience with them? I'm on the 3.62 ratio with factory VSLD, and having a tough time deciding if it would benefit me.

Street car, 1/4 mile for the fun, and HPDE type of events
NA for the foreseeable future, N20 (nitrous) if I start chasing ETs at the strip
Daily now, but hopefully retired to weekend car by end of year
Wavetrac diff for planned upgrade
My driving makes MPG a somewhat moot point

Thoughts, everyone?
There is not enough difference to make a change IMO. If you want gain more then run an 18" wheel and tire combo.

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Old 03-03-2020, 06:15 PM   #58 (permalink)
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Quote:
Originally Posted by Hotrodz View Post
There is not enough difference to make a change IMO. If you want gain more then run an 18" wheel and tire combo.

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Huh. Didnít think of that. Muchas gracias.
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