370z Auto - High-RPM acceleration issue w/ 3.7 gears

SG4247

I put a 3.69 in my auto and had none of what you refer to.

Even on the stock tune, then on Ecutek.

So I am thinking it may be related to HP Tuners.

Wheel speed (mph) is determined by the wheel sensors.

Tire dia will alter the speedo but rear gears don’t.

__________________
NA on E85 - 12.402 @ 112 mph
100 shot E85 - 11.589 @ 117 mph
JWT C2 cams rev Base Circle & Titan Valves

jmikes

It behaves the same with all the same problems even with my stock tune, though I've heard HPTuners isn't very well received. I also had HPTuners tunes on my car before the diff swap without the issues described.

Could be placebo or remembering wrong but I also remember that for some reason my car changed when it shifts in auto mode from around 7250 to 7450~7500 when I turned my shitty hot air intake into a proper long tube CAI. No idea if that has anything to do with it (or how/why that would change the shift point when shift points are determined by the trans controller, not ECU.)

Also, edited my previous post. Speed readout issues were from my tire/wheel setup changing a month or two after the diff change, not the diff. I'm an idiot lol.

__________________
2017 370z 7AT (Metallic Black)
Stillen / ISR / PowerTrix / Morimoto / DAR / Enkei / Akebono / DBA / Michelin