Having trouble with consistancy
 

I have a H/CM camaro that I run in the local S/SS series. My problem is this. With minimum weather change the car is breaking out by at least .12 on the breaks. If I hold it it through the lights will break out by .16 or more. For instance in 3 time runs, it ran exactly the same, within .006. Ist round maybe 25 minutes later...it goes .11 faster on the breaks hard. 350/330hp Vortec combo in a 68 Camaro. The 60ft times are always the same 1.51-1.53. It seems to be gaining before the 1/8 mile looking at the time slips. Where should I start looking? Any help would be greatly appriciated...i hate loosing in the first round with a .020 light.

Re: Having trouble with consistancy
 

If you're talkin' Saturday, the tailwind in first round could have pushed you under.Then again, if you're gettin' tired of losing that way, I have a list of ways to head home in a different fashion!! Glad to share those with you anytime.

No worries TV, you'll get a handle on it.

Re: Having trouble with consistancy
 

Quit (trying I meant) dialing so hard and freight training it. Just dump at the 1000 and 1254 marks and you'll be all set. Or dial softer and fender them or back into them.

Re: Having trouble with consistancy
 

When I had issues like that between the 60' and 330' timers, it was the torque converter I was using with my 3-speed.
Never had a swing like that though. Mine was more like .03-.05

What is your converter, gear, trans combination, and your launch/shift RPM's?

Re: Having trouble with consistancy
 

Stick car or Automatic? I had issues just like that in my 3 speed but my problem was the darn electric shifter, the RPM switch was bad and one round to the next it would shift like 5-600 Rpm Different.

Re: Having trouble with consistancy
 

Put a trans temp guage on the car! running 25 mins after a time run I bet the trans was hotter then it had been all day...

Re: Having trouble with consistancy
 

Ya the same thing happened on sunday as well with no tail wind.It actually started at the last race but not as bad. Seems like its getting worse and worse. Id like to see that list..hahah. Im not expecting to set the world on fire in CanAm but I enjoy going rounds (who doesn't) and it seems like all my consistancy has gone away.I can see by a few hundreths but if I hold it it will go .2 under no problem. You think the tail wind we had was that strong??

Re: Having trouble with consistancy
 

I say 25 minutes...it was probably an hour for real. Whats a good temp to be at with a 350 turbo?

Re: Having trouble with consistancy
 

TCI group 2 superstock converter, 4.88's, 350 turbo. I leave at 3000 on the 2 step with no brake and shift at 7000 and go through the lights at 7000

Re: Having trouble with consistancy
 

According to the TCI information, you don't have enough gear, and are not spinning enough RPM's to use that Group 4 converter.

If you aren't running class heads up, and want bracket style consistency, an 8" Opel style converter would be the choice, I think.


Jeesh, that didn't work very well......

http://www.tciauto.com/Products/Comp...p_conv_7in.asp

Re: Having trouble with consistancy
 

Sound like the trans is going away. Check the fluid and filter, you may not be able to hear or feel it, but it may be slipping. Usually they will get slower not faster, but you never know. With some heat in it, it may expand everything a little and not slip as much. I chased a consistancy problem once and it turned out to be the tranny, didn't show any signs of trouble. Put the tried and true one back in and the car came right back to where it used to be. Then again it wasn't .2 it was .03-.05.

Re: Having trouble with consistancy
 

I had the same problen with my car. I found that the front tires were hitting the inner fenderwells. When the car would get the wheels up the car would come down hard and the front tires would rub the inner fenderwells thus acting like the brakes were being applied. when the car would spin the tires a little bit the front end would stay down. no tire rub and the car would pick up. I corrected the problem by installing a good set of double adjustable front shocks. I also put a set of new front wheels with more offset to the inside to help clear the wheel well. No more scrubbing and much more consistent. Check your front wheel wells to see if the paint is rubbed off. I have a 68 camaro.

Re: Having trouble with consistancy
 

Group 2 not Group 4. 8in converter.

Re: Having trouble with consistancy
 

Ah, okay ya tricked me.....:D

Looking at that chart, the Group 12 would be the place to start, I'd think....

Re: Having trouble with consistancy
 

Ill let you know what happends this weekend. Fresh trans/converter going in. I noticed some consistancy...(only 2 runs) with my trans temp gauge. Both runs were made at 125 degrees for the trans and it ran within .006 of eachother. Thats getting better. Would have loved to make more runs but you can go rounds with a .228 light:) hahaha

Re: Having trouble with consistancy
 

Wow, that is cool on the trans temp....think you could get 160 or so to start the day?

175-180 is supposed to be "optimum" trans temp, and it can make a huge difference.

Re: Having trouble with consistancy
 

I warmed it up to 150 and it seemed to not like it. It fell off a tenth. Could be a trans/converter issue I donno. I have never had a trans temp gauge and dont really want to get into looking at another one...but if it will help me go rounds im in. When I bought the motor off my friend the lines were looped on the trans...the trans builder said put a cooler on it...who do I believe?? Its got a cooler on it now and really dont want to remove it.

Re: Having trouble with consistancy
 

Getting the heat in the trans and not the engine is tough.
I've never run a gauge either, but I do know that my car picks up a touch if I get on the two step too early, and it picks up after the warm-up pass, coolant temp is always the same.
I've also run a trans without a cooler, saw no difference there, but I keep the cooler on my good transmission.

Re: Having trouble with consistancy
 

New converter was good for .01 in 60ft hahaha. But it skys the front end now. Ya my car always picks up after the first run..engine oil hot, rear, trans. The trans doesnt like to be over 125 degrees. Every time I warm it up it slows the car down. When its cold it or under 125 all is good. Hard to explain. Theres only one race left for us this year and I really dont care about consistancy any more...i want to go fast now that the good air have just arrived.

Re: Having trouble with consistancy
 

3033 in the first round?????????????????

See you then

Re: Having trouble with consistancy
 

Haha...whoever gets you in the first round at the next race i will pay them to give me you. And im not watching your stage bulbs anymore. Flickering like Disney on Ice. No more games Dick...its go time....hahahaha

Re: Having trouble with consistancy
 

The old man will consider himself forewarned.

Good luck and don't pay too much for the privelidge. haha

Re: Having trouble with consistancy
 

two hundredths in the 60 is really pretty big. should corespond to about .04 down track. Do you have a burnout routine ?