Drag Racing Tech - Noob 1/4 mile question...

Noob because im not use to driving a built tranny/stalled 4l60e...

So i went to the track after breaking in the trans and stall, with my new nittos 555r's.

I thought these where suppouse to hook as everyone told me they would!!!
My times 16.1 et with a 2.1 60//// 15.7 et 2.3 60/// And the one pass i did some what hook, i let out thinking i was gona spin made 12.6 et 1.9 60 @ 106 I dont get it, does the stall make me loose Trap speed? When stock i was at 110 trap...

Im Pissed!!!
I know I wont see much Improvement as times get a lil faster than stock, and not hoping to see 11's but atleast a low 12.
What em i doing wrong? I have to admit, its a totally different car after the stall. So if you have a stall in your ride, please shime in.

I was way more consistent with stock trans and was able to pull a 2.0 sixty 12.9 Et @ 110

i could do a john force burn out with nittos once we put in the pt4000.......high 12s in the 1/4 with nitto.

next time at the track,switched to et streets & ran an 11.08@121 1.48 60'........

i dumped my nittos and went with some MT ET streets. i say give them a try.

I checked the psi and they are at 38... Is that too much? But it shouldn't matter right!?

UGH!!! This is frustrating... It pulls nice from a 30 tho. lol

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No way you're going to dead hook on the 555R.. You might if you add every suspension piece and a nice shock and spring combo. What pressure did you have them at? Did you do a sissy burnout? However, you should be able to consistentley have better 60s than a 2.1, at your power level.

Edit: 38 psi is waaaaay too much.

No way you're going to dead hook on the 555R.. You might if you add every suspension piece and a nice shock and spring combo. What pressure did you have them at? Did you do a sissy burnout? However, you should be able to consistentley have better 60s than a 2.1, at your power level.

Edit: 38 psi is waaaaay too much.

I was on 38 psi at the track... And as far as a burn out, the usual, around 6-8 seconds.

What psi should i run at the track?...

You are running them at 38psi? Try letting some air out if you are.

try around 16-18 psi..........

Doesnt that slow down the car? Im already running a shitty 106 trap with the stall.
I'll give it a try. What about launch rpm, even at 2k I spin through what it seems the whole 60.

38 in your fronts is ok but yes i agree try 16-18 for your rears.

60' is everything...................................yes, fill the fronts & lower the rears!

i have gone down to 12psi with the nittos & still did not hook,but did get squirelly on the big end.

38 on the back is dumb. drop it to 20 and each run after that drop it 1 more psi until you bog, then go up one. like said above, 38 on the front is ok, for less rolling resistance. i dont even run 38psi when i go on long road trips. high psi is not for drag tires, drag tires need less psi so they can wrinkle the side wall and grip the track.

106mph is low for that setup, even with the stall. Vig is a good quality converter, and shouldn't be costing you that much trap speed IMO. I used to run 106mph trap speeds with a lid/catback and a 3500 Yank - totally stock internals and full weight WS6.

I wonder if that new trans is a bit sloppy, or if your tune needs to be gone over again. I've noticed that sometimes with a new trans, shift points will need to be adjusted, maybe it's shifting too early and costing you some MPH.

Nittos may not be the best tires, but those 60's are horrid. There is no reason u shouldnt be able to do ~1.7 60's even with that nitto. You need to heat them up a lot and you need to run much less PSI in them. Also track prep can make a huge difference too. Try like 20psi, and do a burnout all the way into 2nd gear to get it nice and hot. Try launching by simply putting the hammer down on the 3rd yellow, no brake tq.

Some of your times dont even make any sense though... you did a 16.1 with a better 60 then when you ran 15.7? Are you letting off or something? I mean you must be as those times are very slow...

too much air...

I run a 107 trap and don't have near that mod list. What gear do you have in the rear? What rpm are you launching at?

I run a 107 trap and don't have near that mod list. What gear do you have in the rear? What rpm are you launching at?

As I best remember 2k was rpm launch, the gears are stock 323's.

What the hell is costing me such a low trap speed?...

I think the tire pressure is your enemy. You need to get it to stop spinning. Launch sounds right. But if you can't get it to hook that'd be my guess.

What the hell is costing me such a low trap speed?...

I gave a couple suggestions about this above:

.....I wonder if that new trans is a bit sloppy, or if your tune needs to be gone over again. I've noticed that sometimes with a new trans, shift points will need to be adjusted, maybe it's shifting too early and costing you some MPH.

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?

I had mine @ 30 and spun all the way down the 1/8th on a 2.2 60 ran a 8.9. Dropped down to 20 and had a 1.9 8.2 @ 89mph.

I gave a couple suggestions about this above:




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?

I tried my launch every wich way, loading, flashing, no revs. I hope its only a tune thing and not the trans

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!!!...

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.

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.

Just remember E.T. win races not M.P.H.Trap speed shows
how efficent you are using Horsepower.Nothing more.

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.

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.

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.

It is efficient enough to trap higher than stock with a cam only car. Nothing on his slips add up at all. I trapped 97mph in my last H/C car with my VIG.

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.

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......

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.

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

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.




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.

That is nice DA, it wasn't weather.

25 psi and 20 psi in a 45 series Nitto 555r makes them grip completely different. OP, go an ET Street and never look back.

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?

since no one else is pointing this out, I will.
I noticed you did not post your 60' times for the first 2 passes-what were they?
The only mph pass you listed, unless I missed something, was the 106-letting off to avoid spin.
There is really nothing here to help you with because there has not been a full pass made.

You were more "consistent" with your old set up? I don't think a 2.0 60' is what I would call consistent-unless you mean consistently bad.

So here's the deal-IMO you have not made a clean track pass yet so you will never be able to compare your new mods to your old set up so that's out.
So what next?
Well.......U need to make a clean pass, that means no spinning, no letting off to avoid spin. Clean-pedal down, off idle with ZERO spin.
Then re post your results, THEN you will be able to compare what your car and mods are doing with other members and get usefull feedback.
Nitto's IMO suck but that's me.
If I were u I'd get some 15" rims with some MT radials for the track, get some single adjustable front QA1's and go from there. :nod:

^^ he is no dummy fer sure! lol like he said there really isnt much info.

BUT with what tek said you can't really judge it by what you'de done.

Drop some tire pressure and give it another go.

FWIW I dropped 4 mph when I installed a vig 3600 but I also dropped .4s off the times too.

I went 11.48s with a 317/35/17 nitto on a stock ws6 wheel and absolutely no suspension work back in 2004

since no one else is pointing this out, I will.
I noticed you did not post your 60' times for the first 2 passes-what were they?
The only mph pass you listed, unless I missed something, was the 106-letting off to avoid spin.
There is really nothing here to help you with because there has not been a full pass made.

You were more "consistent" with your old set up? I don't think a 2.0 60' is what I would call consistent-unless you mean consistently bad.

So here's the deal-IMO you have not made a clean track pass yet so you will never be able to compare your new mods to your old set up so that's out.
So what next?
Well.......U need to make a clean pass, that means no spinning, no letting off to avoid spin. Clean-pedal down, off idle with ZERO spin.
Then re post your results, THEN you will be able to compare what your car and mods are doing with other members and get usefull feedback.
Nitto's IMO suck but that's me.
If I were u I'd get some 15" rims with some MT radials for the track, get some single adjustable front QA1's and go from there. :nod:

^^ he is no dummy fer sure! lol like he said there really isnt much info.

BUT with what tek said you can't really judge it by what you'de done.

Drop some tire pressure and give it another go.

FWIW I dropped 4 mph when I installed a vig 3600 but I also dropped .4s off the times too.

I went 11.48s with a 317/35/17 nitto on a stock ws6 wheel and absolutely no suspension work back in 2004





Go to First post to see times...

A buddy of mine, Help me out Identify my TA's poor performance.
First of all, My rev limiter... Its set to 6500 RPM, but of course i payed no mind to that.
My shiftpoints on the other hand! I noticed my ride being a lil sluggish, but many said its just the stall feel, and it shifts right at 6000 RPM, which should be a lil higher, considering i have 3800 stall and needs that extension shift.

Im a lil bummed out about it, just want my ride to be tuned right, and me being pretty new to Modding, dont know what to ask for, and trust the pros to help me with my Ignorace.


So my question is, What would you set your rev limiter and shiftpoints too?


Thoughts welcome...