Possible detonation or bad tranny slip?
05-11-04, 04:01 PM
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Possible detonation or bad tranny slip?
So my friend and I G-teched my car (94 AT) yesterday mostly to see what it could run in the quarter. The time is not important but the odd behaviors that occured during these runs. I'll have to try uploading the runs to my computer so you guys could see them and get a better picture of what I believe happened.
First off we made 3 runs.
First run from idle in Drive. Very sluggish like usual, never felt like the Torque converter actually locked up. Could not complete the run due to not having adequate space. When looking at the graph of RPM to time you could see that first and second where great. Slow start at first then a quick jump up to the first shift point at around 6900, down to around 4000 RPM, then second was the same. Shortly we had to stop, pulled a 15.022 second time according to the Gtech though ithe run was never finished.
Second run in another location. Manually shifted the car with the hold button, started from idle. Seemed like the torque converter just locked up at first and we took off at a pretty good pace. I shifted to first still seemed pretty good, shifted at 7100 and the rpms dropped to around 4000 again. Second gear went though quickly but before we could finish and get into 3rd we had to stop and brake fairly hard to wait for a train to pass. According to the Gtech even while braking we pulled a low 14 second pass at around 95 MPH. Fastest run even though it was incomplete.
Third and final run in another location. Manually shifted the car with the hold button, started from idle. Seemed like just really bad slip because at around 3 seconds according to the graph on the Gtech was when we finally started to accelerate at a good pace and the rpms started to climb. Shifted first at the same rpm as the last run, dropped to the same rpm, second gear still went by quickly. Third gear was when something just didn't seem right. The car seemed to stop pulling and there was mild hesitation, seemed like the RPMs had slowed dramatically and the RPM/acceleration graph no longer seemed like a peak but more like a plateua(sp). There were odd noises at that time but not like detonation noises though it is possible. It seemed like the transmission though I can't be sure. Succesfully completed the run in the high 14 second range at 101 MPH. The HP/time graph shows 200 peak HP for 1st and second then during the time in third it shows that the HP dropped to 50 for the rest of the time.
The car still runs and drives fine after the last run, no lost coolant, vacuum is where it normally is. No boost issues, all three runs were at a constant 10 PSI except at transition where it dropped to around 8 and back up to 10.
I'll see about uploading the runs from the Gtech soon as they tell the story far better than I ever could. Note I'm also making estimations on numbers due to my not having the gtech here with me to compare from memory though the numbers are pretty close.
What do you think it could be?
First off we made 3 runs.
First run from idle in Drive. Very sluggish like usual, never felt like the Torque converter actually locked up. Could not complete the run due to not having adequate space. When looking at the graph of RPM to time you could see that first and second where great. Slow start at first then a quick jump up to the first shift point at around 6900, down to around 4000 RPM, then second was the same. Shortly we had to stop, pulled a 15.022 second time according to the Gtech though ithe run was never finished.
Second run in another location. Manually shifted the car with the hold button, started from idle. Seemed like the torque converter just locked up at first and we took off at a pretty good pace. I shifted to first still seemed pretty good, shifted at 7100 and the rpms dropped to around 4000 again. Second gear went though quickly but before we could finish and get into 3rd we had to stop and brake fairly hard to wait for a train to pass. According to the Gtech even while braking we pulled a low 14 second pass at around 95 MPH. Fastest run even though it was incomplete.
Third and final run in another location. Manually shifted the car with the hold button, started from idle. Seemed like just really bad slip because at around 3 seconds according to the graph on the Gtech was when we finally started to accelerate at a good pace and the rpms started to climb. Shifted first at the same rpm as the last run, dropped to the same rpm, second gear still went by quickly. Third gear was when something just didn't seem right. The car seemed to stop pulling and there was mild hesitation, seemed like the RPMs had slowed dramatically and the RPM/acceleration graph no longer seemed like a peak but more like a plateua(sp). There were odd noises at that time but not like detonation noises though it is possible. It seemed like the transmission though I can't be sure. Succesfully completed the run in the high 14 second range at 101 MPH. The HP/time graph shows 200 peak HP for 1st and second then during the time in third it shows that the HP dropped to 50 for the rest of the time.
The car still runs and drives fine after the last run, no lost coolant, vacuum is where it normally is. No boost issues, all three runs were at a constant 10 PSI except at transition where it dropped to around 8 and back up to 10.
I'll see about uploading the runs from the Gtech soon as they tell the story far better than I ever could. Note I'm also making estimations on numbers due to my not having the gtech here with me to compare from memory though the numbers are pretty close.
What do you think it could be?
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