ZZP's 8.65 Car Questions
Joined: Feb 2008
Posts: 6,466
Last I heard for launching they were running a 4 wheel line lock. That way they could mash the brake, then activate line lock to keep the car held via button while they revved it to spool. A little easier than fighting to keep the brake pedal jammed as the car is fighting under load. Of course the downside with foot braking in general is softer launches from pre-loading the suspension.
If you're interested in harder launches, what about doing a transbrake? The 2 step is great for a consistent launch as you can set the exact rpm limit, but it won't help it leave any harder than foot braking without a 2 step. The transbrake will let you leave harder (assuming the car can hook) and you can dial it in with your 2 step to the traction available where you're running it.
The GM racing team did one on their 4t65, and I know zzp played with it a bit too. Seems like it would be more ideal on the 4t80 as its much more robust in general and probably has stronger reverse clutches too as that seemed to limit the effectiveness of how much the 4t65 could hold on the trans brake.
If you're interested in harder launches, what about doing a transbrake? The 2 step is great for a consistent launch as you can set the exact rpm limit, but it won't help it leave any harder than foot braking without a 2 step. The transbrake will let you leave harder (assuming the car can hook) and you can dial it in with your 2 step to the traction available where you're running it.
The GM racing team did one on their 4t65, and I know zzp played with it a bit too. Seems like it would be more ideal on the 4t80 as its much more robust in general and probably has stronger reverse clutches too as that seemed to limit the effectiveness of how much the 4t65 could hold on the trans brake.
Last edited by bumpin96monte; Aug 6, 2020 at 08:57 AM.
Thread Starter
Joined: Apr 2018
Posts: 301
From: Texas, Tarrant County
Last I heard for launching they were running a 4 wheel line lock. That way they could mash the brake, then activate line lock to keep the car held via button while they revved it to spool. A little easier than fighting to keep the brake pedal jammed as the car is fighting under load. Of course the downside with foot braking in general is softer launches from pre-loading the suspension.
If you're interested in harder launches, what about doing a transbrake? The 2 step is great for a consistent launch as you can set the exact rpm limit, but it won't help it leave any harder than foot braking without a 2 step. The transbrake will let you leave harder (assuming the car can hook) and you can dial it in with your 2 step to the traction available where you're running it.
The GM racing team did one on their 4t65, and I know zzp played with it a bit too. Seems like it would be more ideal on the 4t80 as its much more robust in general and probably has stronger reverse clutches too as that seemed to limit the effectiveness of how much the 4t65 could hold on the trans brake.
If you're interested in harder launches, what about doing a transbrake? The 2 step is great for a consistent launch as you can set the exact rpm limit, but it won't help it leave any harder than foot braking without a 2 step. The transbrake will let you leave harder (assuming the car can hook) and you can dial it in with your 2 step to the traction available where you're running it.
The GM racing team did one on their 4t65, and I know zzp played with it a bit too. Seems like it would be more ideal on the 4t80 as its much more robust in general and probably has stronger reverse clutches too as that seemed to limit the effectiveness of how much the 4t65 could hold on the trans brake.
"Launch Control Mode:
This feature is exclusive to E-TransControl line of controllers and is intended for when the vehicle is used for drag racing. If a launch control switch is connected to the terminal and is grounded the mode is active. In this mode it allows the driver to brake torque the vehicle to full stall RPM without the vehicle moving with only light braking applied. When the switch is disengaged the transmission will go back to the last gear selected and launch. This will work similar to a trans-brake but without any internal modifications or expensive add-on hardware."
Joined: Feb 2008
Posts: 6,466
Honestly never heard of that before- a totally electronic trans brake. Wonder how it works? I'm just not sure how it would apply pressure to both forward and reverse without tapping any hydraulic lines as those systems aren't connected hydraulically.
Last edited by bumpin96monte; Aug 6, 2020 at 07:06 PM.
Thread Starter
Joined: Apr 2018
Posts: 301
From: Texas, Tarrant County
I couldn't tell you how it works either, but it sounds like just what I'll need. Here's hoping it functions as described.
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