anyone to determine slipping?
anyone to determine slipping? I am creating a new thread here after some input from the drag racing tech forum.
This weekend at the track I had been winding all the way through 3rd gear before hitting the end of the 1/4 mile. Looking over my log for the 15th or so time, I am counting that I only made it into 2nd before banging of the limiter.
I was told that with my 3.73s on 275/40/17 I should be good up to roughly 120+ mph (I was only trapping 108). As a result I was told to look into either my tranny or converter slipping.
The tranny is a FLT lvl5 with roughly 1k mi on it. Converter is a Yank ST-3500/2.5 with 25k+ since it was my DD for 4 years. During that the car saw the track less than 1x a month w/ 3 or 4 passes a time.
In June I had the engine forged and the tranny installed. When I was given the dyno graph the speedshop said that the dips at the end were because the converter kept locking/unlocking. The car drives/feels absolutely fine on the street.
Is there anyway I can scan (HPTuners) for the slippage? What is a slipping trans/verter supposed to feel like?
here is the link to my dyno graph
This weekend at the track I had been winding all the way through 3rd gear before hitting the end of the 1/4 mile. Looking over my log for the 15th or so time, I am counting that I only made it into 2nd before banging of the limiter.
I was told that with my 3.73s on 275/40/17 I should be good up to roughly 120+ mph (I was only trapping 108). As a result I was told to look into either my tranny or converter slipping.
The tranny is a FLT lvl5 with roughly 1k mi on it. Converter is a Yank ST-3500/2.5 with 25k+ since it was my DD for 4 years. During that the car saw the track less than 1x a month w/ 3 or 4 passes a time.
In June I had the engine forged and the tranny installed. When I was given the dyno graph the speedshop said that the dips at the end were because the converter kept locking/unlocking. The car drives/feels absolutely fine on the street.
Is there anyway I can scan (HPTuners) for the slippage? What is a slipping trans/verter supposed to feel like?
here is the link to my dyno graph
Last edited by my2kTA; Oct 20, 2008 at 11:11 PM. Reason: never made it to 3rd tapped out 2nd
yeah.. you can log tcc slip rpm.
if you have the converter locked, you'll see if there's any unwanted slip.
if its unlocked, you're going to hit higher rpm at lower speeds just because the torque converter is made to slip more. in that case, you won't see 120+ and 110ish sounds about right.
if you have the converter locked, you'll see if there's any unwanted slip.
if its unlocked, you're going to hit higher rpm at lower speeds just because the torque converter is made to slip more. in that case, you won't see 120+ and 110ish sounds about right.
With a high stall and High STR like you have I would say its a little loose on the top. I would doubt it would be the transmission but just some converter slip up top , Its always a trade off the High STR will give you gobbs of bottom with sacrifice up top, You could try locking the converter after the 2-3 shift not before you could damage trans if you allow it during a shift and possibly make up the difference, There is some risk however of damaging the converter clutch as with the exception of multi disc unit they are not intended to ever lock up at WOT.
I would agree with Bob There those numbers sound about right.
I would agree with Bob There those numbers sound about right.
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yeah.. you can log tcc slip rpm.
if you have the converter locked, you'll see if there's any unwanted slip.
if its unlocked, you're going to hit higher rpm at lower speeds just because the torque converter is made to slip more. in that case, you won't see 120+ and 110ish sounds about right.
if you have the converter locked, you'll see if there's any unwanted slip.
if its unlocked, you're going to hit higher rpm at lower speeds just because the torque converter is made to slip more. in that case, you won't see 120+ and 110ish sounds about right.
You are looking for low numbers when the converter is locked
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