Having trouble with consistancy

CrateCamaro · 09-03-2008, 09:39 PM

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.

Dave Turner · 09-03-2008, 10:40 PM

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.

mannymen · 09-03-2008, 10:53 PM

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.

Dave Goob Cook · 09-04-2008, 09:59 AM

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?

ericsz · 09-04-2008, 01:12 PM

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.

greg fulk · 09-04-2008, 06:47 PM

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...

CrateCamaro · 09-04-2008, 07:14 PM

Quote:

Originally Posted by Dave Turner

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.

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??

CrateCamaro · 09-04-2008, 07:15 PM

Quote:

Originally Posted by greg fulk

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...

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

CrateCamaro · 09-04-2008, 07:18 PM

Quote:

Originally Posted by Dave Goob Cook

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?

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

Dave Goob Cook · 09-05-2008, 12:20 PM

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.

Quote:

4 Heavy Super Stock Cars, 8500 rpm, Low-Torque
Stall Veh. Weight Engine Cubes Gear
600-900 HP
5600-6100 3400-3700 SB 265-327 cid 5.38 to 6.50
Tire size Intake CFM RPM range
28" to 32" 750 to 1050 6500-8500

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

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

09-03-2008, 09:39 PM	#1
CrateCamaro Member Join Date: Nov 2007 Location: Ontario Canada Posts: 411 Likes: 1 Liked 19 Times in 7 Posts	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. __________________ Tony Valerio 1968 Camaro 1700 IHRA H/CM 1701 NHRA SS/?A

09-03-2008, 10:40 PM	#2
Dave Turner VIP Member Join Date: Oct 2005 Location: Schomberg, ON, Canada Posts: 1,216 Likes: 1,530 Liked 341 Times in 133 Posts	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. __________________ Dave Turner #1153

09-03-2008, 10:53 PM	#3
mannymen Senior Member Join Date: Apr 2003 Posts: 728 Likes: 4 Liked 13 Times in 7 Posts	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. __________________ N/A

09-04-2008, 09:59 AM	#4
Dave Goob Cook Member Join Date: Dec 2006 Location: Indy Posts: 422 Likes: 0 Liked 0 Times in 0 Posts	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?

09-04-2008, 01:12 PM	#5
ericsz Member Join Date: Jul 2007 Posts: 140 Likes: 0 Liked 0 Times in 0 Posts	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. __________________ Eric Bowling

09-04-2008, 06:47 PM	#6
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	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... __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"