car spinning! please help!
Thread Starter
9 Second Club
Joined: Jan 2006
Posts: 457
Likes: 1
From: Kinston, NC
car spinning! please help! ok here is what i got. my car is making around 600 hp on the bottle. its a foot brake car with a 3600 stall. i have spohn ta,lca's qa1 single adjustables up front and starnge singles out back. a wolfe sway bay in the back with 6 springs. UMI sfc's.
ok here is how the car is leaving. im leaving at around 2400 rpms and the car hooks and begins to come up. it raises the front around 1 1/2 ft. then comes down and unloads the rear tires and spins. this car has been doing this for over a year now and i am very fustrated. it has cut some mid 1.30's in the sixty but most of the time its in the high 1.40's and 50's.
now i dont know that much about pinion angle, so right now im guessing its around nuetral. i have worked with the shocks front and back and nothing seems to help the car at all. i have even tried flashing the converter at idle off the line and it does the same exact thing. the car just hooks for a split second and then unloads the rear tires and spins.
this car has been 9.90's with it reacting like this, but i know there is more in it. if you guys have any advice i would greatly appreciate it.
ok here is how the car is leaving. im leaving at around 2400 rpms and the car hooks and begins to come up. it raises the front around 1 1/2 ft. then comes down and unloads the rear tires and spins. this car has been doing this for over a year now and i am very fustrated. it has cut some mid 1.30's in the sixty but most of the time its in the high 1.40's and 50's.
now i dont know that much about pinion angle, so right now im guessing its around nuetral. i have worked with the shocks front and back and nothing seems to help the car at all. i have even tried flashing the converter at idle off the line and it does the same exact thing. the car just hooks for a split second and then unloads the rear tires and spins.
this car has been 9.90's with it reacting like this, but i know there is more in it. if you guys have any advice i would greatly appreciate it.
Sounds like the instant center is off, that's what usually what causes that. What angle are the control arms at compared to the ground? Where do you have the shocks set? What tires, air pressure? Do you have travel limiters on the front, and if so what kind of downtravel do you have it set to?
More detail needed.... but I'm going to guess, that the instant center is off and needs to be adjusted (lca angle wrong, or the front of the tq arm needs to be adjusted up or down) Shocks, I'd put the rears at 6 fronts at 3 (if you are running qa1 or strange both single adjustables)
Pinion angle isn't going to make or break this, I usually run mine about 1/2 a degree negative for referance, and have had good luck with it there.
Strapping the front end down (eliminating 1 to 2 inches of downtravel) may help alot as well, to get the car moving forward more and not coming up as much.... upward motion is wasted forward motion.
More detail needed.... but I'm going to guess, that the instant center is off and needs to be adjusted (lca angle wrong, or the front of the tq arm needs to be adjusted up or down) Shocks, I'd put the rears at 6 fronts at 3 (if you are running qa1 or strange both single adjustables)
Pinion angle isn't going to make or break this, I usually run mine about 1/2 a degree negative for referance, and have had good luck with it there.
Strapping the front end down (eliminating 1 to 2 inches of downtravel) may help alot as well, to get the car moving forward more and not coming up as much.... upward motion is wasted forward motion.
sounds like its on the ragged edge of hooking... here's some things you can do
add weight to the trunk
make the power come in smoother (progressor)
take a little pill size out
the car is capable of taking the hit... its just a fine line... you could find some one close by that knows how to set up a 4th gen.
add weight to the trunk
make the power come in smoother (progressor)
take a little pill size out
the car is capable of taking the hit... its just a fine line... you could find some one close by that knows how to set up a 4th gen.
TECH Apprentice
Joined: Dec 2008
Posts: 372
Likes: 1
From: Kinston North Carolina
Sounds like the instant center is off, that's what usually what causes that. What angle are the control arms at compared to the ground? Where do you have the shocks set? What tires, air pressure? Do you have travel limiters on the front, and if so what kind of downtravel do you have it set to?
More detail needed.... but I'm going to guess, that the instant center is off and needs to be adjusted (lca angle wrong, or the front of the tq arm needs to be adjusted up or down) Shocks, I'd put the rears at 6 fronts at 3 (if you are running qa1 or strange both single adjustables)
Pinion angle isn't going to make or break this, I usually run mine about 1/2 a degree negative for referance, and have had good luck with it there.
Strapping the front end down (eliminating 1 to 2 inches of downtravel) may help alot as well, to get the car moving forward more and not coming up as much.... upward motion is wasted forward motion.
More detail needed.... but I'm going to guess, that the instant center is off and needs to be adjusted (lca angle wrong, or the front of the tq arm needs to be adjusted up or down) Shocks, I'd put the rears at 6 fronts at 3 (if you are running qa1 or strange both single adjustables)
Pinion angle isn't going to make or break this, I usually run mine about 1/2 a degree negative for referance, and have had good luck with it there.
Strapping the front end down (eliminating 1 to 2 inches of downtravel) may help alot as well, to get the car moving forward more and not coming up as much.... upward motion is wasted forward motion.
No the spohn is not.
Make sure the lca's aren't at too much of an angle, should be about -2 degrees from level at ride height (compared to level ground)
Ya may want to look into a stock type tq arm with a bmr tq arm relocation tranny xmember, that's what I have been using and it works pretty good.
Madman arm would be the best choice, if your exhaust will clear it I'd go that route.
Make sure the lca's aren't at too much of an angle, should be about -2 degrees from level at ride height (compared to level ground)
Ya may want to look into a stock type tq arm with a bmr tq arm relocation tranny xmember, that's what I have been using and it works pretty good.
Madman arm would be the best choice, if your exhaust will clear it I'd go that route.
Sounds to me like you just needs some tweaking of the chassis. I'd run your pinion angle at -2, make sure your lca's run at an uphill angle towards the front of the car, and get some better shocks. Strange double adjustables in the very least, AFCOs preferred. A torque arm upgrade would help. We can get you set up with virtually anything. Give me a call at the shop if you're interested. 225-673-3533
TECH Apprentice
Joined: Dec 2008
Posts: 372
Likes: 1
From: Kinston North Carolina
Sounds to me like you just needs some tweaking of the chassis. I'd run your pinion angle at -2, make sure your lca's run at an uphill angle towards the front of the car, and get some better shocks. Strange double adjustables in the very least, AFCOs preferred. A torque arm upgrade would help. We can get you set up with virtually anything. Give me a call at the shop if you're interested. 225-673-3533
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Hes got the strange shocks in the rear and QA1's up front. It has a moser 12 bolt rearend i believe. But the car wont respond to any shock adjustments. Its got to be in the instant center i would think at this point. I dont know exactly what angle the control arms are at but i will try to find out.
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Verdad Gallardo Hes got the strange shocks in the rear and QA1's up front. It has a moser 12 bolt rearend i believe. But the car wont respond to any shock adjustments. Its got to be in the instant center i would think at this point. I dont know exactly what angle the control arms are at but i will try to find out.
TECH Apprentice
Joined: Dec 2008
Posts: 372
Likes: 1
From: Kinston North Carolina
Thanks guys for all the input. I think he found a grimlin that could be most of the problem. We will find out Thursday night i suppose. Got to try to get it rite before saturday. We are going to try to run it in a true street class heads up quarter mile. I really feel like the car has the power potential for some 6 teens in the 1/8 if we could get it to hook. I would love to scale the car out and find the center of gravity. I think that would be some useful info if he ever decides to really fine tune the car.
Thread Starter
9 Second Club
Joined: Jan 2006
Posts: 457
Likes: 1
From: Kinston, NC
thanks for all the info guys. unfortuantly the race has been canceled for tomm. so we will have to just try it out next weekend. found a little problem in the TA earlier this week that may be the source of my problems. if that does not work we are def. going to try shock and lca adjustments. but anyway thanks again guys.
