7at 4.08 FD Thoughts

jchammond

Unsure how many bolt on’s You have; I added 40rwhp with exhaust,CAI & Tune....added a few more smaller things-but not retuned yet.
Hot weather w/345/30’s on 12” Wheels- traction is good.
Cold weather/ not good...I did lose acceleration with additional 48lbs. Of rotating mass from Wheels.
Drop in 3.69 Nismo diff & gained acceleration back & bad traction issues in 1,2nd. 3rd gear 45 up Rollin or higher (in cool weather)
I hit rev limiter @116mph (7700) in 4th gear w/worn 345/30’s (26.8”)
I’m sure they will hook fine at the Dragstrip.
As mentioned earlier....rpms up 250 @75mph cruise.
3.90 would add another 150 & another 150 for 4.08’s.
Unsure your goals/ but won’t matter much on tire size,,, as the 4.92 & 3.19 1st,2nd gear ratios will blister up some rubber.
Will be fun to drive.
I’m about to install factory diameter/width tire’s on base Wheels- so this could be interesting.
Right now: A 60roll is neck snapping.
Repost what you do.

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MazWorx built long block | FI-TT-100 Stage 2.75 | IPT built 7A/T

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