adcook

Well guys I tried it again today... not much luck! Still pulling 1.7 60's. I tried higher air pressure, leaving at 2200, 2500, 3000 and back at 3600. Nothing seems to help. Any other ideas?? This thing is starting to frustrate me!

87silverbullet

iTrader: (11)

Can you list more of your setup?

Gears?
Whose converter?
Can you get us a vid of the car at the track?

If you can, make sure it is close up and on the side of the car so we can see how the suspension is working.

Those stock lower control arms are know for flexing and the rubber bushings don't help either but they wouldn't cause your poor 60'.

The 1st gear of that th400 isn't helping you either.

Is it pulling high or low 1.7 60's?

What does it do on the motor? I would expect 1.7 on the motor, not the spray.

adcook

Well I have a stock ls1. completely stock with a hundred shot of nitrous, long tubes, revmax converter with 4000 stall, tci trans brake with manual valve body, umi tunnel mount torque arm, 10 bolt with motive gears, auburn posi and superior axles. on mickey et street 26x10.5-16. I don't have a video, but do have a pic of launch when it picks up front end, but seems to fall on its face then picks back up again. Oh and the pcm was sent off to pcmforless for a tune

87silverbullet

iTrader: (11)

Just to give you an example, we had a car that we did full bolt ons to with no internal motor work and it went 1.4 60 foots and ran 11.86 on motor. So I wouldn't expect your car to do that but it should be a 12-12.20 car on the motor with what you have and cut 1.5- 1.6 60's.

When you foot braked the car, what did it flash to?

When I aksed what gears I meant the numerical value, not the brand.

Nah, a pic isn't going to tell much, we need a video.

As for falling on its face that could be your whole problem. Its definately not supposed to do that. Does it do that on motor too or only the nitrous? I think we need to focus on that first.

93camaro_zzz

iTrader: (13)

Have you said what rear end gears you have in it yet? I didnt catch it. If you are running a 3.50 gear or lower numerically (2.73-3.50) than that would be your problem. You are just not able to put enough torque to the ground with the 2.48 1st gear of the TH400.

adcook

Sorry guys I thought I did say what gear was in it. I have a 4.10 rearend gear in it. I don't know if it does it on motor or not. I didn't feel like wasting another 20 bucks for one run yesterday at the track. If I can get away from the farm Wednesday night I will take it to Indy and try it out.

As far as trying to fash it foot braking it seems like it only went to 25-2600. It's still in the trailer and I haven't unloaded it yet.

87silverbullet

iTrader: (11)

4.10 will be more than enough gear with a th400. You need to see if this falling on its face thing is happening on the motor too.

What I mean by flashing it, is putting the rpms up at around 12-1500 rpms and when the lights go down nail it and see what it flashes to. If you say you have a 4000 rpm converter and all it will flash to is 25-2600 then something is definately wrong with the converter.

Man, you don't need to take it to the track to find this out. Take it to the street and launch it. You will know immediately if it is doing it on the motor. Then do a nice long 70ft rolling burnout and back up on top of your tracks and flash the converter like I just said and see what the rpms go up to. Report back what you find out.

adcook

OK I talked to my transmission guy and apparently I have already flashed the converter with brake on. Most it will turn is 3600.

87silverbullet

iTrader: (11)

You cant flash a converter on the brake. You flash it like I described earlier.

With a 4k converter it should footbrake to 3600 and flashing it should get it to 4-4200. Leave the brake out of it.

adcook

Ok I'll give it a try tomorrow evening, but I don't know if it will hook up any on our road. Starting to get a lot of rubber out in front of the house anyways lol.

I guess what is so strange to me is that the first pass on this new transmission I foot braked it and it had a 1.56 60' and ran a 7.20. Since then the closest it has been is like a 1.67 60' and a 7.38 in the 1/8th mile of course

adcook

I tried to flash that converter today, but I don't believe it worked out too well. It just blows the tires off way before it hits even close to 4000 rpm.

I checked fuel pressure and it was at 50psi with ignition and 60psi with car running.

I also checked for codes on the computer and it had 4 show up. 2 were O2 sensors and one was a MAF sensor and I cant remember what the last one was. I reset them but didn't have a chance to try it out again.