Tag Archives: Gearing

NSX POWER PLANT AND MANY MANY RED BAGS

honda nsx na1 c30a
oem honda parts
oem honda parts
oem honda parts
oem honda parts

It has been one thing after another here as of late, however we have not forgotten about the NSX. With the engine already dropped out and most of the parts here, it will be any day now that we start on this rebuild. On the agenda we’re looking at a complete rebuild from top to bottom along with the transmission being cracked open for gearing changes. It should be fun times… and if you are wondering what was wrong with the engine before? Nothing, this is something that you should do if you love your car!

ATS&ACROSS 4.929 FINAL GEAR

ats final gear
ats final gear
ats final gear

Prior to, a brand new USDM ITR transmission was ordered. Aside from the 4th, 5th and final gear, it is completely identical to the JDM 98-spec trans. Listed here are the gear ratios for both trans.

USDM ITR transmission gear ratio:
1st: 3.230
2nd: 2.105
3rd: 1.458
4th: 1.107
5th: 0.848
Reverse: 3.000
Final Drive: 4.400

JDM 98-spec ITR transmission gear ratio:
1st: 3.230
2nd: 2.105
3rd: 1.458
4th: 1.034
5th: 0.787
Reverse: 3.000
Final Drive: 4.785

Having the closer 4th and 5th gear was defiantly a plus, however the potential was limited by the 4.400 final gear found in the USDM trans. Solution? That was easy, we replaced it with a 4.929 final gear from ATS&ACROSS. Increased acceleration and response is noticed from this new setup.

New transmission with ATS&ACROSS 4.929 final gear @ 9000rpm:
1st: 3.230 – 63.47Km/h
2nd: 2.105 – 97.38Km/h
3rd: 1.458 – 140.61Km/h
4th: 1.107 – 185.19Km/h
5th: 0.848 – 241.74Km/h
Reverse: 3.000
Final Drive: 4.929