what causes this?

BIZMANRACING · 07-14-2008, 12:17 PM

went racing this week, everything was fine until the first round. when i pressed my line lock button, the car rolled forward a bit. kind of surprised me. i think it surprised the guy in the other lane to since we was dead late from hell (.138) to my .001. but none of the numbers on the run were any good since i went in so deep.

so my question is whats wrong? one guy told me its my shifter not putting the car "all the way into first gear" another told me that my trans is going away. yes that it does that if it gets hot. trans temp was 200???? so what the f*&k. just kind of upset. i was all up beat about the car and driving and now this. its always something.

any help please.

SSTRACER323 · 07-14-2008, 02:14 PM

Carlos the same thing happened to me second round at the Div 3 race in
Chicago.... i found out i was to high on the rpms when i hit the trans brake button ( you said line lock, did you mean trans brake?)
Check to make sure your fluid level is right and it is possible the trans is going bad, but my trans guys said he doubts any problems with the trans on mine just to high on the rpms...... hope this helps

Lee

BIZMANRACING · 07-14-2008, 02:25 PM

YES I DID MEAN TRANS BRAKE.

i only have the rpms maybe at 1500 when i hit the button and mash the gas pedal. bad trans is not good. in a tough dollars and cents world something like this could just spell the end for 2008.

SSTRACER323 · 07-14-2008, 03:03 PM

I know what you mean..... it is getting tougher and tougher to keep racing
I hope it is not a bad trans for you...

Lee

sst3447 · 07-14-2008, 03:20 PM

check your band adjustment if it is too loose the car will roll when you apply the transbrake

Adger Smith · 07-14-2008, 04:36 PM

In a P/G the band is applied when it is pulled into low gear. Rolling forward is usually too low line pressure at the time you apply the Trans Brk or too much clutch clearance in the rev clutches. The low(forward band) is applied and the rev clutches must apply to hold or lock up the forward movement. If they(rev clutches) are late or slow applying you will roll/creep forward.Try changing the spring pressure or the size of the boost valve (.488 dia gets the most pressure) in the valve body to raise the line pressure. You might also try going to a higher apply RPM to get the pump spinning up the pump pressure-Vol. Low vol. or worn pumps require higher RPM to move the required fluid vol to apply the rev clutches. The hardest thing to fix is the rev clutch pack clearance. (requires complete transmission disassembly)The more clearance, the more fluid vol is required to apply the rev clutches. I usually work around .060 for pro tree and around .085 to .090 on .500 tree applications. With it doing it hot I would put a pressure gauge on the rev & check the difference in hot or cold pressures. You can also judge how fast the pressure rise is when you apply the Trans brake.
Good luck, hope this helps you solve your problem.

07-14-2008, 12:17 PM	#1
BIZMANRACING Junior Member Join Date: Oct 2004 Location: east brunswick, new jersey Posts: 62 Likes: 0 Liked 0 Times in 0 Posts	what causes this? went racing this week, everything was fine until the first round. when i pressed my line lock button, the car rolled forward a bit. kind of surprised me. i think it surprised the guy in the other lane to since we was dead late from hell (.138) to my .001. but none of the numbers on the run were any good since i went in so deep. so my question is whats wrong? one guy told me its my shifter not putting the car "all the way into first gear" another told me that my trans is going away. yes that it does that if it gets hot. trans temp was 200???? so what the f*&k. just kind of upset. i was all up beat about the car and driving and now this. its always something. any help please. __________________ S/ST 1739 Carlos Mendes

07-14-2008, 02:14 PM	#2
SSTRACER323 Senior Member Join Date: Jul 2006 Location: Coal City, IL. Posts: 775 Likes: 3 Liked 1 Time in 1 Post	Re: what causes this? Carlos the same thing happened to me second round at the Div 3 race in Chicago.... i found out i was to high on the rpms when i hit the trans brake button ( you said line lock, did you mean trans brake?) Check to make sure your fluid level is right and it is possible the trans is going bad, but my trans guys said he doubts any problems with the trans on mine just to high on the rpms...... hope this helps Lee __________________ The Doughboy Lee Lones S/ST 323L

07-14-2008, 02:25 PM	#3
BIZMANRACING Junior Member Join Date: Oct 2004 Location: east brunswick, new jersey Posts: 62 Likes: 0 Liked 0 Times in 0 Posts	Re: what causes this? YES I DID MEAN TRANS BRAKE. i only have the rpms maybe at 1500 when i hit the button and mash the gas pedal. bad trans is not good. in a tough dollars and cents world something like this could just spell the end for 2008. __________________ S/ST 1739 Carlos Mendes

07-14-2008, 03:03 PM	#4
SSTRACER323 Senior Member Join Date: Jul 2006 Location: Coal City, IL. Posts: 775 Likes: 3 Liked 1 Time in 1 Post	Re: what causes this? I know what you mean..... it is getting tougher and tougher to keep racing I hope it is not a bad trans for you... Lee __________________ The Doughboy Lee Lones S/ST 323L

07-14-2008, 03:20 PM	#5
sst3447 Junior Member Join Date: Apr 2003 Location: erie ill Posts: 69 Likes: 0 Liked 0 Times in 0 Posts	Re: what causes this? check your band adjustment if it is too loose the car will roll when you apply the transbrake

07-14-2008, 04:36 PM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: what causes this? In a P/G the band is applied when it is pulled into low gear. Rolling forward is usually too low line pressure at the time you apply the Trans Brk or too much clutch clearance in the rev clutches. The low(forward band) is applied and the rev clutches must apply to hold or lock up the forward movement. If they(rev clutches) are late or slow applying you will roll/creep forward.Try changing the spring pressure or the size of the boost valve (.488 dia gets the most pressure) in the valve body to raise the line pressure. You might also try going to a higher apply RPM to get the pump spinning up the pump pressure-Vol. Low vol. or worn pumps require higher RPM to move the required fluid vol to apply the rev clutches. The hardest thing to fix is the rev clutch pack clearance. (requires complete transmission disassembly)The more clearance, the more fluid vol is required to apply the rev clutches. I usually work around .060 for pro tree and around .085 to .090 on .500 tree applications. With it doing it hot I would put a pressure gauge on the rev & check the difference in hot or cold pressures. You can also judge how fast the pressure rise is when you apply the Trans brake. Good luck, hope this helps you solve your problem. __________________ Adger Smith (Former SS)