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Used my transbrake for the first time today and it was .8 seconds consistently slower.
Trying to think of why this might be? I have 28" tall tires, 3:73 gears and it has 460hp/460tq. All other mods in my sig.
It's a jakes 4l80e with circle d single disk 3500. When I real ease the button it takes a fraction of a second to take off, there is a small amount of lag. Brake is wired to a 12v wire under my dash, can't remember what wire off the top of my head?
Operation of the brake went like this. Held bottom down, floored it, let go of botton never let off the gas.
The stall was made for 80% street and 20% track and is for a procharger from a previous build. I plan on adding boost soon, just testing out the new motor now. At the moment it's a leftover stall but it will work as planned when I add boost. It is full weight also.
I do not want to change anything about the car, stall, gear, etc. but is there a solution to going faster using the TB or just wait for boost and build it high at the line?
What comes to mind is maybe footbraking it probably just flashes it higher then launching off the trans brake, and since your stall is too small for the current combo the extra flash rpm is worth more then expected.
If it's getting boosted in the future I wouldn't worry about trying to troubleshoot it until then.
There isn't a special trick to launching off the brake, your combo just needs to work together since your launch is still limited by your gear and stall .
I'm also thinking that since I'm new to the TB and with everything going on with my nerves at the starting line there is a good chance I was on the brakes with my left foot when doing the TB? Sounds stupid but thinking back I don't really remember sitting there without my foot on the brake? I'll have to try it again next week properly, obviously it will be slower if I was on the brake pedal too. There was still a hesitation from the car wanting to move after I released the button even though I could have possible been pushing the brake pedal too.
The stall flashes around 4300 and with the TB it would leave at 5500ish.
I'm also thinking that since I'm new to the TB and with everything going on with my nerves at the starting line there is a good chance I was on the brakes with my left foot when doing the TB? Sounds stupid but thinking back I don't really remember sitting there without my foot on the brake? I'll have to try it again next week properly, obviously it will be slower if I was on the brake pedal too. There was still a hesitation from the car wanting to move after I released the button even though I could have possible been pushing the brake pedal too.
The stall flashes around 4300 and with the TB it would leave at 5500ish.
IMO something is up with that stall. If you are not running a 2-step (and it looks like you aren't) the motor will only rev to the limit of the stall on the TB with it put to the wood. Put a call in to Circle D...
Why a 28" tire?
The used 12 bolt I bought came with 3:73s and I've had them with 26s and hated it on the highway with boost. The 28s bring it down to more like having 3:42s
The used 12 bolt I bought came with 3:73s and I've had them with 26s and hated it on the highway with boost. The 28s bring it down to more like having 3:42s
Gotcha...
I still say something is up with the converter...if it stops motor at 5500 then that is what the converter is...your times and 60' should be much better with your combo. GL
Did your trans brake get hooked up trough a relay? If so that may be your lag. A lazy relay. Hook your button directly to the brake with no relay. Should take care of the lag if so.
I Tapped into a 12v wire under the dash, not sure if that wire comes off a relay but I'll check. I did not install a relay, just straight wired from the button to the TB.
The 80 and TB have always been installed but I'm just now starting to use the TB at the track, never did it before. The times are all from the same day with me either foot braking it or using the TB.
If that converter is going to 5500 on the brake with your power level then there is something wrong with that converter. A 3500 converter should only be flashing around 3800 at that power level. More power the higher it will flash. Sounds like its blowing thru the converter off the brake. Causing your lag. Send it back to Circle D and tell them everything. Because if its doing that now. You can imagine how it will be with more power. At least call them and see what they say.
Strange right? I had s few issues that I just fixed and it might be a cause.
After the last run I parked the car and realized there was a puddle of coolant on the ground. Not sure how often this was happening but I was missing 1/4 of my coolant when I checked. Turned out I mixed up my steam vent with my overflow on the rad and the missing coolant got my car pretty hot. I figured the car was hot because I was running back to back 3 times in a row but it could be a big cause of the low mph.
I've only been to the track a few times and it's all still pretty new to me and I might not have seen the RPMs correctly. I'll go test the TB on the road and see where the engine / stall stop and get back to you guys.
I spoke to Chris at circle d about a month ago when I was testing the TB on the street and thought there was a problem but he said everything was alright.
I didn't want to say anything to offend you, but your 60' was varying by a full tenth in a stalled auto so I thought maybe experience with the combo may be a factor as well. That is likely also be the tires and suspension not being up to par too...shredding the tires will kill your 60'.
The tires might be rubbing the rolled fender a tad off the line. I run stock springs in the back with no isolaters (donuts) and billstine shocks, no drag stuff. I might put the isolaters back on to lift the rear a little to avoid any rubbing. The only other suspension stuff I can think of that would make a difference is the anti roll bar and torque arm, other than that its setup decent. Just billstines in the front too, no drag stuff.
05-30-2015, 01:07 AM
First time using brake and it's slower 
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