Wheelspin or transbrake problem ?

SmBlkFord · 09-15-2013, 06:33 PM

Reaction times are in the teen`s - high twenties most of the time , especially when I am practicing a lot in car at home , Question is how can go from .012 ,.146 .055, .148 during a test n tune day with new slicks ? at first I thought it was some wheelspin , but how could the 60` times be within .011 from best to worst , This has been going on before and after car was re wired and its driving me nuts already , I hear the transbrake coming on and off , but the measurement in time is so small you would never know if it`s slacking , heard they just go bad and don`t work ? Have had this brake for years and trans has always been freshened , Thanks for the Help .

Curt Rees · 09-15-2013, 06:50 PM

Tires are not slipping on the rims are they? Mark the tires at the valve stems and see if the marks move. I had that problem.

#5457

Curt Rees

SmBlkFord · 09-15-2013, 06:55 PM

Have rim screws both sides .

Jody Lang · 09-15-2013, 07:47 PM

Sticky button or sticky valve that the trans brake solenoid activates?

SmBlkFord · 09-15-2013, 08:48 PM

Button is good has been tested on a practice tree , solenoid maybe , what is this valve that you mean ? Is this part of the valvebody itself ? Thanks

MEXJOE · 09-15-2013, 10:43 PM

Fix your trans its slipping !!

SS Engine Guy · 09-15-2013, 10:54 PM

If the trans has been out lately and you have an external transbrake solenoid it is very easy to bump it on the way in or out causing the plunger to bind slightly causing inconsistent releases. Also, a bur or foreign material on the internal valve that the transbrake releases on launch can cause these problems. I bumped so many solenoids in the past that I now remove the thing and plug the hole before removing a trans with external solenoid.
Just a suggestion. Most likely, as stated, the trans is slipping and new tires may have made it more noticeable.

Tom Goldman · 09-15-2013, 11:15 PM

Pressure regulator springs are often an overlooked source of consistency problems , especially on a fluid exhaust type of brake .
Brake valve release time is dependent on proper & consistent line pressure .
A low pressure problem will be even worse as fluid temp increases.

Jody Lang · 09-15-2013, 11:48 PM

What trans is it?

No way trans is slipping if 60s are within .011. Could it?

442OLDS · 09-16-2013, 05:39 AM

Quote:

Originally Posted by SmBlkFord

Reaction times are in the teen`s - high twenties most of the time , especially when I am practicing a lot in car at home , Question is how can go from .012 ,.146 .055, .148 during a test n tune day with new slicks ? at first I thought it was some wheelspin , but how could the 60` times be within .011 from best to worst , This has been going on before and after car was re wired and its driving me nuts already , I hear the transbrake coming on and off , but the measurement in time is so small you would never know if it`s slacking , heard they just go bad and don`t work ? Have had this brake for years and trans has always been freshened , Thanks for the Help .

If possible,I would have somebody else drive the car and see what lights they get.Practicing a lot in car at home and actually being on a race track can be two different things.Try to eliminate the driver from the equation.

09-15-2013, 06:33 PM	#1
SmBlkFord Junior Member Join Date: Oct 2012 Location: Bensonhurst Posts: 43 Likes: 0 Liked 0 Times in 0 Posts	Wheelspin or transbrake problem ? Reaction times are in the teen`s - high twenties most of the time , especially when I am practicing a lot in car at home , Question is how can go from .012 ,.146 .055, .148 during a test n tune day with new slicks ? at first I thought it was some wheelspin , but how could the 60` times be within .011 from best to worst , This has been going on before and after car was re wired and its driving me nuts already , I hear the transbrake coming on and off , but the measurement in time is so small you would never know if it`s slacking , heard they just go bad and don`t work ? Have had this brake for years and trans has always been freshened , Thanks for the Help .

09-15-2013, 06:50 PM	#2
Curt Rees Member Join Date: Dec 2001 Location: Ft. Pierre, SD Posts: 353 Likes: 310 Liked 227 Times in 48 Posts	Re: Wheelspin or transbrake problem ? Tires are not slipping on the rims are they? Mark the tires at the valve stems and see if the marks move. I had that problem. #5457 Curt Rees __________________ Curt Rees 5457 SS

09-15-2013, 06:55 PM	#3
SmBlkFord Junior Member Join Date: Oct 2012 Location: Bensonhurst Posts: 43 Likes: 0 Liked 0 Times in 0 Posts	Re: Wheelspin or transbrake problem ? Have rim screws both sides .

09-15-2013, 07:47 PM	#4
Jody Lang Member Join Date: Mar 2002 Posts: 299 Likes: 28 Liked 81 Times in 25 Posts	Re: Wheelspin or transbrake problem ? Sticky button or sticky valve that the trans brake solenoid activates?

09-15-2013, 10:43 PM	#6
MEXJOE Senior Member Join Date: Jun 2008 Location: nhranumbers.com Posts: 869 Likes: 129 Liked 151 Times in 48 Posts	Re: Wheelspin or transbrake problem ? Fix your trans its slipping !! __________________ Glen DeMenge 1969 Camaro Stock Eliminator

09-15-2013, 08:48 PM	#5
SmBlkFord Junior Member Join Date: Oct 2012 Location: Bensonhurst Posts: 43 Likes: 0 Liked 0 Times in 0 Posts	Re: Wheelspin or transbrake problem ? Button is good has been tested on a practice tree , solenoid maybe , what is this valve that you mean ? Is this part of the valvebody itself ? Thanks

09-15-2013, 10:54 PM	#7
SS Engine Guy Member Join Date: Sep 2003 Location: usa Posts: 256 Likes: 1 Liked 1 Time in 1 Post	Re: Wheelspin or transbrake problem ? If the trans has been out lately and you have an external transbrake solenoid it is very easy to bump it on the way in or out causing the plunger to bind slightly causing inconsistent releases. Also, a bur or foreign material on the internal valve that the transbrake releases on launch can cause these problems. I bumped so many solenoids in the past that I now remove the thing and plug the hole before removing a trans with external solenoid. Just a suggestion. Most likely, as stated, the trans is slipping and new tires may have made it more noticeable.

09-15-2013, 11:15 PM	#8
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,438 Likes: 780 Liked 703 Times in 206 Posts	Re: Wheelspin or transbrake problem ? Pressure regulator springs are often an overlooked source of consistency problems , especially on a fluid exhaust type of brake . Brake valve release time is dependent on proper & consistent line pressure . A low pressure problem will be even worse as fluid temp increases. __________________ Tom Goldman 1500 SG , 1506 STK

09-15-2013, 11:48 PM	#9
Jody Lang Member Join Date: Mar 2002 Posts: 299 Likes: 28 Liked 81 Times in 25 Posts	Re: Wheelspin or transbrake problem ? What trans is it? No way trans is slipping if 60s are within .011. Could it?