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07-07-2014, 09:32 AM | #1 |
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Inconsistency
Is it possible for a converter to cause an issue where my car will make 3 or 4 passes within .04 of each other then out of nowhere make a pass that is .2 slow. On the pass where is slows down it loses ET everywhere starting with the 60'. Everything has been changed on the car trying to solve this issue, wiring, MSD, coil, fuel system, etc... I am of the assumption that if something was wrong in the converter it would continue to slow down, where as once I load up after making this slow pass, the next time to the track the car is right back to making good passes.
3000 lbs car 540" BBC Ladder Bar Rear Suspension Powerglide I installed a data recorder to track engine RPMs this past weekend and on the two passes where the car fell off, the RPMs are very shaky from about .07 into the run. I will try to post a picture of the graph later. |
07-07-2014, 07:32 PM | #2 |
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Re: Inconsistency
post up all the time slips in order from the day in question.
That said, moving .04 in 3 or 4 passes is a problem no mind 2 tenths. Consistency starts and end with the one wearing the brain bucket. Are you doing everything exactly the same from the moment you buckle your harness to the moment you cross the stripe? Last edited by 1320racer; 07-07-2014 at 07:35 PM. |
07-08-2014, 05:45 PM | #3 |
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Re: Inconsistency
Too rich makes it too sensitive to temp and Baro changes.
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Ed Wright 4156 SS/JA |
07-08-2014, 07:25 PM | #4 |
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Re: Inconsistency
I pay extra attention to my routine for consistency, especially since these issues have come up.
I have the RPM graphs saved as pdfs but am not sure how to post them. I do not think it is jetting just for the fact that no big change in weather has to happen for the car to make a slow run. No matter what the weather does the 4th or 5th run will be .2 slow and if we make any additional passes after the slow run they are slow as well. |
07-08-2014, 09:35 PM | #5 |
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Re: Inconsistency
again, post the time slips in order from one day.
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07-11-2014, 01:48 PM | #6 |
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Re: Inconsistency
Had a car do that once, had one broken roller in converter sprag.
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Lee Valentine 1661 STK |
05-18-2015, 01:00 PM | #7 | |
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Re: Inconsistency
Quote:
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01-01-2016, 11:12 AM | #8 |
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Re: Inconsistency
I had a very similar issue. Sent a good converter back to be freshened, when it returned it would do good for the first pass then the car would do weird things. It was a sprag converter. I had it cut twice, chased my tail looking at everything else on the car, finally at the end of the year, tried a different converter, the car went on kill. Both times I had the converter cut I was told that there was nothing wrong with it. There was something wrong with it but they just couldn't find it. One of the trans guys that cut the converter has it in his shop now and he told me he was going to find out just what was wrong. I have called him twice and he still doesn't have any answers.
If you changed the converter and the car is working, my advice is to not send the converter back that was causing you problems if it has been checked once, but junk it and start over. I would go back to the 8" if you still have it and get it tightened up. Good luck, this can be a very frustrating and time consuming problem. |
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