advice please confused about 60 ft.
Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
advice please confused about 60 ft. Here is the long story shortened, I have finished my 4l80 swap and picked it up from the tuner on thursday,, took it to the track on friday. Car is a 383 dynoed at 477hp 443tq with converter unlocked. I made multiple passes and here is what is going on. I have a converter that was built for spray, On the street it goes to 3k footbraking, with the transbrake on and no rev limiter it will go to 4200. I launched the car at
2500 on the limiter, and it ran a 7.5 at 95 mph with a 1.87 60 ft.
2200 and the car slowed down.
3000 and went 7.41 at 96 mph with a 1.72 60ft.
I am not sure why my 60s are so terrible.
This was on a set of SLICKS running 14-12 lbs of pressure
SUSPENSION: umi kmember with stock a-arms and brakes,, Strange adjustable shocks, set to 0 Rear is a QP 9" with 3.75 gears, QA shocks set to 4 on the right and 5 on the left, aftermarket lower arms, relocation brackets ( in lowest hole) aftermarket panhard, and torque arm. Pinion angle is at 0 degrees.
Dont know the weight of the car, its a 98 T/A with all the hvac stuff gone, egr and the likes, and my fat butt in the car.
Right now the only thing I can think of is that the converter is sloppy on the motor, Maybe I should up the RPMS even more? I have some video I can post, if needed, the car did not spin the tires.. Any help would be appreciated, as I am dissappointed.
2500 on the limiter, and it ran a 7.5 at 95 mph with a 1.87 60 ft.
2200 and the car slowed down.
3000 and went 7.41 at 96 mph with a 1.72 60ft.
I am not sure why my 60s are so terrible.
This was on a set of SLICKS running 14-12 lbs of pressure
SUSPENSION: umi kmember with stock a-arms and brakes,, Strange adjustable shocks, set to 0 Rear is a QP 9" with 3.75 gears, QA shocks set to 4 on the right and 5 on the left, aftermarket lower arms, relocation brackets ( in lowest hole) aftermarket panhard, and torque arm. Pinion angle is at 0 degrees.
Dont know the weight of the car, its a 98 T/A with all the hvac stuff gone, egr and the likes, and my fat butt in the car.
Right now the only thing I can think of is that the converter is sloppy on the motor, Maybe I should up the RPMS even more? I have some video I can post, if needed, the car did not spin the tires.. Any help would be appreciated, as I am dissappointed.
If youre not spinning at all then up the rpms on launch. I pulled low 1.6s all day yesterday dumping it at 5500 on 275 40 17 ET radials. Your suspension setup looks good. With your power & slicks 1.5s shouldnt be a problem.
Pinion angle should be set at -3 degrees down. Like posted above launch it harder. My car footbraking it to 3k will pull constant 1.47 60fts and occasionally 1.43, all on a 15inch MT drag radial.
just keep running it there, your driveshaft builder will love you for it when you're bringing it back for new ujoints on a regular basis.
These cars ARE NOT LEAF SPRING CARS AND DO NOT NEED THIS MUCH PINION ANGLE PERIOD!
I don't know how many times this has been covered!
Ron I would put the thing on the transbrake, foot to the floor and let it eat at whatever it will go to... anything less with a converter built for nitrous, and running it n/a is not going to get you anywhere!
At the power you have and the weight of your car, you should be able to see a high 10 out of it with the converter the way it is.
But.. I wouldn't worry about that too much... unless you're making motor runs to make sure the n/a tune is right I wouldn't waste your time.... put the bottle in the car and let it eat.
These cars ARE NOT LEAF SPRING CARS AND DO NOT NEED THIS MUCH PINION ANGLE PERIOD!
I don't know how many times this has been covered!
Ron I would put the thing on the transbrake, foot to the floor and let it eat at whatever it will go to... anything less with a converter built for nitrous, and running it n/a is not going to get you anywhere!
At the power you have and the weight of your car, you should be able to see a high 10 out of it with the converter the way it is.
But.. I wouldn't worry about that too much... unless you're making motor runs to make sure the n/a tune is right I wouldn't waste your time.... put the bottle in the car and let it eat.
Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
Yes,,, These were just motor passes,, didnt spray the car, because it was the first time at the track on the new engine trans setup, was trying to learn a little about the cars manners. Was just real dissappointed in it.
I sure hope that the converter is the culprit for those crappy 60 fts.
Thanks for the advice fellas,, any more will be appreciated, I hope to take it to the track this friday also,, and I will remove the rev-limiter and make some motor passes again,, and see what happens with the pedal to the floor as you recommend Jason.
I sure hope that the converter is the culprit for those crappy 60 fts.
Thanks for the advice fellas,, any more will be appreciated, I hope to take it to the track this friday also,, and I will remove the rev-limiter and make some motor passes again,, and see what happens with the pedal to the floor as you recommend Jason.
Hit the transbrake button and put the pedal to the floor like JLWS6 said. I am sure that the converter is to tight to be ideal for n/a. I bet when you spray it that sucker will come alive. A nitrous setup is never ideal running without nitrous, if that makes sense.
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[QUOTE=JL ws-6;15513924]just keep running it there, your driveshaft builder will love you for it when you're bringing it back for new ujoints on a regular basis.
These cars ARE NOT LEAF SPRING CARS AND DO NOT NEED THIS MUCH PINION ANGLE PERIOD!
I don't know how many times this has been covered!
Hahahahaha! I found this out the hard way...........
These cars ARE NOT LEAF SPRING CARS AND DO NOT NEED THIS MUCH PINION ANGLE PERIOD!
I don't know how many times this has been covered!
Hahahahaha! I found this out the hard way...........
Stick cars need more PA than auto cars. -1/-2 is fine for an auto. UMI had me set mine at 0 then got -1 on the rear bracket. First and only pass I made so far was a new best 60ft flashing the converter from 2500. To bad the rest of the run the car felt like a turd.
Do some reading and then when you do change it and the car runs better, make sure you post the results back up.
Ron... try it without the 2 step on.. put it right up on the converter and let it eat.
Then, put the 2 step back on and spray it.... you'll have to have a doctor pry the smile off your face.