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5th to 2nd Issue

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#1
dshaw340

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I've been racing my 90 Miata for almost 10 years now and never had any issues like the one I'm about to describe.  At Pacific Raceway at the end of the straight I want to shift from 5th to 4th but it wants to go into 2nd. I only went out racing once last year and blew up the engine doing this. Today it happened once again during test n tune.   I don't know if its just me having issues or has anyone else had this problem and is it something going on in the tranny.  I did get a 370Z 6 speed last year and I'm wondering if the difference in shifters are messing with my head..  



#2
FTodaro

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If your telling me that you have raced this box for 10 years without a rebuild,  then i would tell you it needed a rebuild about 6 years ago. The shift forks are soft and the will eventually wear to the point that they will not fully engage the gear and allow miss shifts and incomplete shifts. The plastic bushing on the end of the shifter is soft and is designed to deform and should be changed at least once to twice a year depending on how much you race. Getting that box rebuilt would be way cheaper that replacing the motor.


Frank
TnT Racing
SCCA Ohio Valley Region
Chairman, SCCA Great Lakes Divisional Series Committee.

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#3
Sphinx

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One thing to make sure of is that your turret has the requisite trans fluid in it.  I was missing shifts and ultimately took a peak in there.  Found to be almost dry.  About that plastic bushing replace it or use the illegal aluminum one - good for 2hp.



#4
Steve Scheifler

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At least you know your 2nd gear synchro is good. ;)
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#5
dshaw340

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Thanks guys.  There's a lot of wisdom there.  I thought I was losing my mind.  I just had the bushing replaced by my mechanic but I'll check the fluid in the turret.  I only go out about three times a season but I'm sure the box needs a rebuild.  I bought the car off Craigslist and have been racing with that same engine and gearbox up to last year so I guess I can't complain.  My buddy at the track has a 91 and I can feel his shifter is a lot tighter and closer than mine which would indicate worn forks I guess, as you are suggesting Frank. I went out a couple more times today and being very careful I was able to not hit 2nd gear again.  Qualifying and race tomorrow.  Wish me luck!  Thanks again guys. 






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