Background:
Problem:
The trans shifts quickly and flawlessly at high revs through all the gears, except 2-to-3 upshifts grind badly unless I let the revs fall to 4250 or so.
This is unexpected since I would expect 1-2 to be problematic from autocrossing, but they are smooth and easy, even above 6000 RPM. I have only used 3rd gear about 4 times in autocrossing over the last few years, so I dont think its been abused on the track. However, I want to do an HPDE or Time Trial this year, and waiting 2 seconds for the revs to fall from 7000 to 4250 is not a good thing...so I want to fix the 2-3 grind problem.
I'd like any input on where to start with troubleshooting this problem... clutch adjustment? shift rod or fork? bad synchro?
Thanks in advance.
- I have a 91 CRX Si tranny that was rebuilt in January of '05. It was a stock Si trans with new synchros, exedy oem clutch, throwout bearing, and resurfaced flywheel.
- I have autocrossed it at at least 50 events since then over the last 2 years using 1-2 gears, and 3rd only a few times.
- I have daily driven the car, but not abusively
- Never drag raced
- I've had no horrible misshifts that I can remember
- I have ES motor mount inserts and shifter bushings.
- In December of 05, and just this December I have drained and refilled it with Honda MTF
Problem:
The trans shifts quickly and flawlessly at high revs through all the gears, except 2-to-3 upshifts grind badly unless I let the revs fall to 4250 or so.
This is unexpected since I would expect 1-2 to be problematic from autocrossing, but they are smooth and easy, even above 6000 RPM. I have only used 3rd gear about 4 times in autocrossing over the last few years, so I dont think its been abused on the track. However, I want to do an HPDE or Time Trial this year, and waiting 2 seconds for the revs to fall from 7000 to 4250 is not a good thing...so I want to fix the 2-3 grind problem.
I'd like any input on where to start with troubleshooting this problem... clutch adjustment? shift rod or fork? bad synchro?
Thanks in advance.