Who can solve this?
Thread Starter
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
Re: Who can solve this? (YO-EL)
The burn out box is not as dry and sticky as when you stage...your launch is obviously good... with your 60'.... I think what you are feeling is something we use to call sensation... I believe its the difference in traction in the box, as oppose to the stage...
Race Director
Joined: Oct 1999
Posts: 17,709
Likes: 1,219
From: Phila PA, Bonita Springs FL
Who can solve this?
Why would my car be "alive" , quick , etc, when doing the wheel clean & burnout prior to raceing, but then at the line while power braking say 1500-1700 rpms, it sounds weak, and is always SLOW to respond at launching?
Car is LS-1 Edit dynoed tuned, TC/AH off, abuse mode disabled.
Car actually runs supreme, but is always sluggish off the line.
Like I said, at idle to WOT, car ROARS & spins tires during quick clean off & ROASTS them doing burnout. But once I'm at the line, its a dog to move.
Any thoughts??????
I'm about at my wits end over this, and am practically ready to offer a financial REWARD to ANYONE who can figure this out!!!
Car is LS-1 Edit dynoed tuned, TC/AH off, abuse mode disabled.
Car actually runs supreme, but is always sluggish off the line.
Like I said, at idle to WOT, car ROARS & spins tires during quick clean off & ROASTS them doing burnout. But once I'm at the line, its a dog to move.
Any thoughts??????
I'm about at my wits end over this, and am practically ready to offer a financial REWARD to ANYONE who can figure this out!!!
Instructor
Joined: Dec 2002
Posts: 183
Likes: 0
From: Shelby Twp MI
Re: Who can solve this? (YO-EL)
Are you launchinf in first gear and also is the Torque Converter out of lock-up? If it's set to lock at a certain speed or RPM in whatever gear that could cause it to bog.
One more thing. Thats a high stall speed for your car. That stall is meant for Heads & cam cars and could also be used on a 383 stroker
[Modified by UAWDES1, 11:31 PM 3/21/2004]
One more thing. Thats a high stall speed for your car. That stall is meant for Heads & cam cars and could also be used on a 383 stroker
[Modified by UAWDES1, 11:31 PM 3/21/2004]
Racer
Joined: Dec 2002
Posts: 293
Likes: 1
From: Marco Island florida
Re: Who can solve this? (YO-EL)
what gear are you launching in? it should be 3rd, You could also have a worn clutch band in the tranny, good for a good burn out and then gets warmed up and stretches a little. Also could be converter slipping, but I doubt it. "Is it still sluggish off the line on the street or just the track? Is this consistant in all conditions. What gears?
Race Director
Joined: Oct 1999
Posts: 17,709
Likes: 1,219
From: Phila PA, Bonita Springs FL
Re: Who can solve this? (esram)
I do everything in 3rd...
The worn clutch band is a thought.. I will investigate further...
3:42 gears. I really don't do too much driving on the street except to & from the track, but the thought of the clutch band being good for a burnout & then stretching, I'm not overly technical about trannys, so I wonder if this is a realistic probability??
The worn clutch band is a thought.. I will investigate further...
3:42 gears. I really don't do too much driving on the street except to & from the track, but the thought of the clutch band being good for a burnout & then stretching, I'm not overly technical about trannys, so I wonder if this is a realistic probability??
Race Director
Joined: Oct 1999
Posts: 17,709
Likes: 1,219
From: Phila PA, Bonita Springs FL
Re: Who can solve this? (YO-EL)
A tranny expert wrote this to me:
It is possible for bands to overheat and lose some of their grip, especially under the rigors of drag racing. They don't really stretch per se, but rather the friction material on the band gets hot and loses its ability to grip. At the extreme of band wear the band actually gets burnt. Overheating/burning a band would result in a slipping condition in the trans, which you would see as RPM's increasing with no resulting increase in MPH.
That being said, I doubt your problem is a band problem. The 1-2 band in your 4L60E trans comes on (grabs the clutch drum) in second gear and fourth gear, not first and 3rd. The only components engaged in first gear are the low/reverse clutch pack and the 1-2 sprag (one-way clutch). Here again, if these components had a problem, there'd be more of a slip condition, not the "bog down"/loss of power that you're describing.
To me the problem you're experiencing sounds more like an engine performance/fuel delivery issue.
It is possible for bands to overheat and lose some of their grip, especially under the rigors of drag racing. They don't really stretch per se, but rather the friction material on the band gets hot and loses its ability to grip. At the extreme of band wear the band actually gets burnt. Overheating/burning a band would result in a slipping condition in the trans, which you would see as RPM's increasing with no resulting increase in MPH.
That being said, I doubt your problem is a band problem. The 1-2 band in your 4L60E trans comes on (grabs the clutch drum) in second gear and fourth gear, not first and 3rd. The only components engaged in first gear are the low/reverse clutch pack and the 1-2 sprag (one-way clutch). Here again, if these components had a problem, there'd be more of a slip condition, not the "bog down"/loss of power that you're describing.
To me the problem you're experiencing sounds more like an engine performance/fuel delivery issue.
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Race Director
Joined: Oct 1999
Posts: 17,709
Likes: 1,219
From: Phila PA, Bonita Springs FL
Re: Who can solve this? (Mike Mercury)
60' times are very consistent 1.74-1.75
Last week, very cold, new best ET, 60' was 1.71> 3 times...
Car is VERY consistent. 60' & ET, but INCONSISTENT off the line.
Launching is the only issue, where it sometimes "jumps", but 95% of the time, is a dog, and very sluggish...
The more I think about it, it seems to be some type of tuning/performance, A/F or timing issue..
I have been trying to get someone to autotap my car, but to no avail.
Dyno tuning with my Vararam is of no use. I need a track autotap from someone knowledgeable to really see whats going on..
Last week, very cold, new best ET, 60' was 1.71> 3 times...
Car is VERY consistent. 60' & ET, but INCONSISTENT off the line.
Launching is the only issue, where it sometimes "jumps", but 95% of the time, is a dog, and very sluggish...
The more I think about it, it seems to be some type of tuning/performance, A/F or timing issue..
I have been trying to get someone to autotap my car, but to no avail.
Dyno tuning with my Vararam is of no use. I need a track autotap from someone knowledgeable to really see whats going on..