Noob 1/4 mile question...
As far as a sloppy trans job, I can only say that the guys works for gm and was there that they built it. He's done many other rides around here and no one has ever complaint about his work. Has been rebuilding Gm Trans for 12yrs. In case it was a sloppy trans job... What should i be looking for???
Definately gonna want to take some air out of those Nittos. You have to do a good burnout and have them at like 16-18psi in order to hook. Even then though they can be a bitch to hook. Those tires IMO are meant for 12-14 second cars...
How are you launching the car? Brake pedal and revving the car up? Or just taking off from idle?
How are you launching the car? Brake pedal and revving the car up? Or just taking off from idle?
This is all that Ive done to my Trans Am...
Tsp 224 cam, Tsp Valve springs, pushrods, Ls6 oil pump, Ls2 Timming chain, Gutted Cats, Cut out, Shortie headers, SLP Lid, KnN filter, TB Bypass, Home made Below, Trans cooler, Debaffled scoops, Built 4L60e, 3800 Vigilante, Nittos 555r's and Full Dyno tune, By Lethal In San Antonio tx.
What should I be running on the 1/4 and trap speed?... I need to know to start narrowing down where my problem is, if any other than the Nitto's at high psi.
This is very frustrating!!!...
Tsp 224 cam, Tsp Valve springs, pushrods, Ls6 oil pump, Ls2 Timming chain, Gutted Cats, Cut out, Shortie headers, SLP Lid, KnN filter, TB Bypass, Home made Below, Trans cooler, Debaffled scoops, Built 4L60e, 3800 Vigilante, Nittos 555r's and Full Dyno tune, By Lethal In San Antonio tx.
What should I be running on the 1/4 and trap speed?... I need to know to start narrowing down where my problem is, if any other than the Nitto's at high psi.
This is very frustrating!!!...
Dude your running an R rated tire at a higher psi than the street version requires. Start with the psi and stop looking everywhere else. Bad launches more often than not are due to tires or track prep or driver.
Alright, I'll head out to the track in the next few days... will try to set tires at 17 psi and go from there.
You can't sat dialing in the setup until you see what the mods you have are capable of.
Lower the tire pressure to high teens and go to the track.. Update the thread after that then we can go from there.
You have all the right parts for a low 12/high 11 car, you just need to get all the issues straightened out. You did a nice list of mods all at once so it might take some testing to get the issue resolved, if you even have one with the right pressure in the rear.
Lower the tire pressure to high teens and go to the track.. Update the thread after that then we can go from there.
You have all the right parts for a low 12/high 11 car, you just need to get all the issues straightened out. You did a nice list of mods all at once so it might take some testing to get the issue resolved, if you even have one with the right pressure in the rear.
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What was the DA? That can make a huge impact on your trap speed. Also, the vigilante converter, while a very good converter, is NOT efficient on the top end. It will 60' better than most converters but trap a little lower.
RPM Ws6 was pointed in the right direction, after you get your tire pressure straightened out.
Everybody is jumping past the MAIN thing that was wrong.. The only thing we should speculate being wrong at this point. Tire pressure. I wouldn't go worrying about converter selection, cam lift, and if your spare tire is in or out until you run again with a good clean pass.
I agree with you that it is low, and the other problems should be worked out first. He did ask in the original post about losing mph with a converter. I have a 3600 vig converter and have logged high slip percentages with it.
No doubt.. I just don't get carried away with rattling my brain with fixes until I know there is a problem with the setup and not just how I am approaching a pass.
1 thing @ a time,we know the tire pressure was way off.
so lets try starting there & see what happens......
i know for a fact that i dropped over a full secound by just changing from nitto DR. to ET streets.......i could do a john force burn out passed the 1/8th with nittos with out trying hard on 15" drag rims.
nittos with 12# of air...... 12.89@118 2.?? 60'
et streets with 16# of air..11.08@121 1.48 60'
just by swapping tires.that is a big difference in my book........
i started @ 20# with both brand tires & worked my way down until i got the best results or loss of safety.......
try to video tape your next outing & post it up......
so lets try starting there & see what happens......
i know for a fact that i dropped over a full secound by just changing from nitto DR. to ET streets.......i could do a john force burn out passed the 1/8th with nittos with out trying hard on 15" drag rims.
nittos with 12# of air...... 12.89@118 2.?? 60'
et streets with 16# of air..11.08@121 1.48 60'
just by swapping tires.that is a big difference in my book........
i started @ 20# with both brand tires & worked my way down until i got the best results or loss of safety.......
try to video tape your next outing & post it up......
Like everyone else stated, tire pressure.
I cut high 1.7's on my 555R's as a manual with just boltons. As a stalled, cammed, auto...you should have NO problem getting atleast to that point.
From your posts, I'm confused on what you want out of your pass. A low ET or high trap? Normally a lower 60' will drop your MPH and your ET.
I cut high 1.7's on my 555R's as a manual with just boltons. As a stalled, cammed, auto...you should have NO problem getting atleast to that point.
From your posts, I'm confused on what you want out of your pass. A low ET or high trap? Normally a lower 60' will drop your MPH and your ET.
From your posts, I'm confused on what you want out of your pass. A low ET or high trap? Normally a lower 60' will drop your MPH and your ET.[/QUOTE]
Im just trying to narrow it down, and see how i can improve overall.
Im worried that i may have issues with the new mods. When stock trans, i ran a 12.9 @ 110 2.0 sixty. Only goin 12.75 at 106 as best time has me worried.
I know the tires have alot to do with it, but just feel the car should pull harder and be a lil faster
Im just trying to narrow it down, and see how i can improve overall.
Im worried that i may have issues with the new mods. When stock trans, i ran a 12.9 @ 110 2.0 sixty. Only goin 12.75 at 106 as best time has me worried.
I know the tires have alot to do with it, but just feel the car should pull harder and be a lil faster
Density Altitude: 1989 feet
Relative Density: 94.31 %
That tire will not make a difference in traction if you go below 18-20 especially with your car being full weight.
Try anywhere between 20-25 that should be where you find best traction. It's still going to spin and it won't hook everytime especially now that it has a stall on those tires.
Try anywhere between 20-25 that should be where you find best traction. It's still going to spin and it won't hook everytime especially now that it has a stall on those tires.
I'll be heading to the track soon... For now, Ive been practicing and getting to know my car after stall/trans job.
Here's some day runs.
Dig
http://youtu.be/NLEul8dXRn4
40...
http://youtu.be/Ts0VZsE2TV8
40...
http://youtu.be/0xPsmqGejuQ
Why does my car lag so much? Is it the 40 roll?
Here's some day runs.
Dig
http://youtu.be/NLEul8dXRn4
40...
http://youtu.be/Ts0VZsE2TV8
40...
http://youtu.be/0xPsmqGejuQ
Why does my car lag so much? Is it the 40 roll?