Loss of traction AFTER launch... weird pulsing vibration on decel...
03-20-2010, 11:00 AM
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Loss of traction AFTER launch... weird pulsing vibration on decel... Ok guys when i launch on the street i can get good traction off the launch... using the transbrake up to about 2psi or so it will dead hook...but after the launch i loose all traction..... 
...... so do you think if i change my pinion angle will it help??? im at -2* right now...
also on a decel after a run i get a pulsating vibration.... i put the car in neutral and rev it up and hold like 3500rpm and i can still feel the pulsation/vibration...
i have stock motor mounts (havent put in the poly motor mounts yet) and a have a poly trans mount.... i have a chassis mounted spoohn Tq arm... th400, new spohn driveshaft, bmr lcas panhard stb...
what do you think is causing the pulsing vibration??? vvvvvvvvvvvvveeeeeeeeeerrrrrrrrrrraaaaaaaaa vvvvvvvvvvvveeeeeeeeeeeeeerrrrrrrrrraaaaaa vvvvvvvvvvvvvvvvvvvvvveeeeeeeeeeeeeerrrrrrrrrrrrrr aaaaaaaaaaaa
its starting to drive me crazy! any ideas???
It does it on decel and in neutral....
...... so do you think if i change my pinion angle will it help??? im at -2* right now...also on a decel after a run i get a pulsating vibration.... i put the car in neutral and rev it up and hold like 3500rpm and i can still feel the pulsation/vibration...
i have stock motor mounts (havent put in the poly motor mounts yet) and a have a poly trans mount.... i have a chassis mounted spoohn Tq arm... th400, new spohn driveshaft, bmr lcas panhard stb...
what do you think is causing the pulsing vibration??? vvvvvvvvvvvvveeeeeeeeeerrrrrrrrrrraaaaaaaaa vvvvvvvvvvvveeeeeeeeeeeeeerrrrrrrrrraaaaaa vvvvvvvvvvvvvvvvvvvvvveeeeeeeeeeeeeerrrrrrrrrrrrrr aaaaaaaaaaaa
its starting to drive me crazy! any ideas???
It does it on decel and in neutral....
03-20-2010, 01:19 PM
#2
Take care not to place the trans in neutral while the car is traveling. This will cause the internals of the trans to speed up 2 to 2.5 times faster then if left in gear. This can cause the trans internals to over speed and could make the trans blow like a grenade, possibly hurting you. Rossler transmission has a nice right up on their web page explaining this dangerous condition.
While the car is sitting still, put the trans in neutral and slowly bring the rpm up to see if it is vibrating like that. If it does not then the engine and the convertor is balanced properly. If you still feel it then I would say either the convertor or the engine is not balance right (or both together). If it does not vibrate then the issue could be in the trans, drive shaft, "U" joints, tires, and the last possible cause could be the tune.
Let us know what you find.
While the car is sitting still, put the trans in neutral and slowly bring the rpm up to see if it is vibrating like that. If it does not then the engine and the convertor is balanced properly. If you still feel it then I would say either the convertor or the engine is not balance right (or both together). If it does not vibrate then the issue could be in the trans, drive shaft, "U" joints, tires, and the last possible cause could be the tune.
Let us know what you find.
03-20-2010, 08:48 PM
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Take care not to place the trans in neutral while the car is traveling. This will cause the internals of the trans to speed up 2 to 2.5 times faster then if left in gear. This can cause the trans internals to over speed and could make the trans blow like a grenade, possibly hurting you. Rossler transmission has a nice right up on their web page explaining this dangerous condition.
While the car is sitting still, put the trans in neutral and slowly bring the rpm up to see if it is vibrating like that. If it does not then the engine and the convertor is balanced properly. If you still feel it then I would say either the convertor or the engine is not balance right (or both together). If it does not vibrate then the issue could be in the trans, drive shaft, "U" joints, tires, and the last possible cause could be the tune.
Let us know what you find.
While the car is sitting still, put the trans in neutral and slowly bring the rpm up to see if it is vibrating like that. If it does not then the engine and the convertor is balanced properly. If you still feel it then I would say either the convertor or the engine is not balance right (or both together). If it does not vibrate then the issue could be in the trans, drive shaft, "U" joints, tires, and the last possible cause could be the tune.
Let us know what you find.
O no never put the car into neutral while moving, only while parked...
I had a retard attack! its my crank pulley that isnt balanced...
had an issue getting it off a while ago and threw it across the shop and chipped off a good section of it! oooops, thanks!
03-20-2010, 08:51 PM
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http://www.baselinesuspensions.com/i...A_Drag_Car.htm
Here is your info on blowing the tires after launch.
Here is your info on blowing the tires after launch.
03-20-2010, 09:49 PM
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I think its just because im on the street.... if i was at the track and could leave at good boost it would help.
Im leaving at 0-2 psi off the brake and dead hooks... then the car jumps to 17.5 psi and its all over for traction after that.... lmfao
i need to learn to control my my happy right foot!
i wanna see what it does at the track befor i worry about it to much!
Thanks for all the good info guys!
Im leaving at 0-2 psi off the brake and dead hooks... then the car jumps to 17.5 psi and its all over for traction after that.... lmfao
i need to learn to control my my happy right foot!
i wanna see what it does at the track befor i worry about it to much!
Thanks for all the good info guys!
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03-22-2010, 10:01 PM
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ya it might be combination of all this stuff... when i get back home (been all over the surrounding states the past 1.5 weeks) im gonna have to work on some of this stuff..
just remembered i had a video that caught the sound (listen after the pull).....
http://s721.photobucket.com/albums/w...7-07-31-02.flv
just remembered i had a video that caught the sound (listen after the pull).....
http://s721.photobucket.com/albums/w...7-07-31-02.flv
03-22-2010, 10:45 PM
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i am switching my 373 to 300 gears soon (when i get time) wo ill be checking out the rear...
i honestly thing its a combination of the crank pulley/poly mounts/rear...
03-22-2010, 11:27 PM
#17
What turbo and how much boost were you on for that pull? Got an 1/4 times?
This is mine doing the same pull but only to 110 instead of 120
http://www.streetfire.net/video/new-...ser_739072.htm
Your decel noise sounds similar to an out of balance drive shaft/wheel. Mine made the same noise until I got the wheels and drive shaft properly balanced, but it also was there when driving.
This is mine doing the same pull but only to 110 instead of 120
http://www.streetfire.net/video/new-...ser_739072.htm
Your decel noise sounds similar to an out of balance drive shaft/wheel. Mine made the same noise until I got the wheels and drive shaft properly balanced, but it also was there when driving.
Last edited by Zombie; 03-22-2010 at 11:35 PM.
03-23-2010, 12:36 AM
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What turbo and how much boost were you on for that pull? Got an 1/4 times?
This is mine doing the same pull but only to 110 instead of 120
http://www.streetfire.net/video/new-...ser_739072.htm
Your decel noise sounds similar to an out of balance drive shaft/wheel. Mine made the same noise until I got the wheels and drive shaft properly balanced, but it also was there when driving.
This is mine doing the same pull but only to 110 instead of 120
http://www.streetfire.net/video/new-...ser_739072.htm
Your decel noise sounds similar to an out of balance drive shaft/wheel. Mine made the same noise until I got the wheels and drive shaft properly balanced, but it also was there when driving.
not to bad for a little 5.3 pushing a 3800# car...
no track times, im hoping for a low 10... i can hit full boost off the t-brake in about 1.5 seconds, if i can hook and no spining it has a low 10 easy
03-23-2010, 11:56 AM
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My last car made 80 less HP and i didnt have a transbrake and pulled off a 10.7... so i figure having the transbrake and extra hp i should be able to get a low 10.. i have to get the ******* thing to hook good first though
