I have made 35 runs on this combo this year and the 60’s have been very consistent within .01. Couple weeks ago the car started rocking backwards when the transbrake was engaged. We adjusted the band at the track following the proper procedures. After making that change, the 60’ has started varying .04 and reaction times are not as consistent. We swapped a different converter in the car and that did not help.
The only thing that we have touched on the car was the band adjustment. Is there something in the tranny associated with the band that could be causing this? You can see that the engine varies on how quickly it climbs when it comes off the transbrake.
It is a FTI transmission with around 150 runs.
Thoughts? Is it worth swapping our spare in and running it or should we continue to swap parts to see if we can find it elsewhere.
Although several of FTI’s members will be in Martin MI for the FTI Summer Shootout this weekend (I’d bet they’re already there) I believe the tech help line is still being manned at FTI. Have you tried calling them ??
What procedure did you use to adjust the band and did it cure the rocking back issue?
We did call FTI. They said it could be anything and didn’t offer much more information except to say it may be worthwhile to put in the spare.
We followed the following for adjusting the band:
Tighten the band adjustment screw to 72 inch lbs. Unscrew the band adjuster three and a half turns
Same procedure I use, did it fix the rocking issue?
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Not sure how swapping trans will find issue with one in car. Icould see pulling one out and pulling it down. I can almost guarantee swapping in another will get rid problem,but will not fix transmission.
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Was band bad lose? If not you probably have another issue. I have found worn pump causes backing up most often.
Adjusting the band did resolve the car rocking on the starting line.
I would be swapping trans so you know for sure that is the issue then if cured have trans gone through. Why waste time trying things when you got a spare. Heck you might find out you got a motor issue instead of trans and trans swap might show you that.
If adjusting the band helped the rocking, but your 60's are moving around a bunch, I would be pulling that thing apart to check out the pump, band condition and even look at the drum. You may have more going on here than just a loose band. Do you have a gauge to check pump pressure?
We have swapped transmissions and see what happens next weekend. Thanks for the advice. If the 60’ times are consistent, we will have it torn down.
Who did you talk to at FTI??
Let me jump in. I am not sure who you talked to here but I would be curious to know. Proper band adjustment is critical. My crew was in Mi. Please call me at the office 1-386-736-5816. This is Greg. I will handle this. there is not a band aid to fix. I just need to know some more particulars. You can send me an email as well at firstname.lastname@example.org.
The band adjustment shoudl not affect 60 foot as the band is applied when the car leaves the starting line,unless the band is slipping. The transbrake engages the reverse clutch while the band is already applied. What makes band adjustment critical is that when the large volume of oil is needed to apply the reverse piston it will drop pressure for a split second as the regulator catches it. If the band is too loose then it will momentarily release allowing the car to rock. The reverse clutch releases when the transbrake is released. If 60 and react is affected and they follow each other then the problem would be in the reverse clutch or the converter or brakes. Maybe this helps. Again I would like to know who told you we couldnt help to put spare in!!!
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