Launching a turbo car at the track .... ?
Launching a turbo car at the track .... ? So my car has been running a little bit now and I tried to get my car down the track on 17" 295 mickey thompsons set at 17psi. My issue im having is getting the power off the line. I try to brake boost it and it wont come close enough to boost. Best 60 was a high 1.7 doing that. So i tried hitting the transbrake and she spun bad. Im pretty sure i had it at full boost. So I guess im asking what do yas do ? Hit the transbrake and try to throttle it just as boost is starting to come in?
Its a 408 with t6 s480. 4l80e 35-3700 stall but its a bit loose so shoots up pretty good under boost.
It trapped 137mph at 8.7psi on friday night.
Its a 408 with t6 s480. 4l80e 35-3700 stall but its a bit loose so shoots up pretty good under boost.
It trapped 137mph at 8.7psi on friday night.
it sounds like you need suspension work, and you need to hit the tires harder off the line and get wheel speed up quicker
leaving off the line with no boost and then having it come on quick is always going to result in problems getting down the track
you really have to leave on the boost or it will never work
probably need to invest in a a 2-step and a trans brake
8-9 psi isnt a lot, and you can probably turn it up a bit once you get the car to leave hard...but its going to take 6+ psi off the line and some good suspension to go with it.
leaving off the line with no boost and then having it come on quick is always going to result in problems getting down the track
you really have to leave on the boost or it will never work
probably need to invest in a a 2-step and a trans brake
8-9 psi isnt a lot, and you can probably turn it up a bit once you get the car to leave hard...but its going to take 6+ psi off the line and some good suspension to go with it.
it sounds like you need suspension work, and you need to hit the tires harder off the line and get wheel speed up quicker
leaving off the line with no boost and then having it come on quick is always going to result in problems getting down the track
you really have to leave on the boost or it will never work
probably need to invest in a a 2-step and a trans brake
8-9 psi isnt a lot, and you can probably turn it up a bit once you get the car to leave hard...but its going to take 6+ psi off the line and some good suspension to go with it.
leaving off the line with no boost and then having it come on quick is always going to result in problems getting down the track
you really have to leave on the boost or it will never work
probably need to invest in a a 2-step and a trans brake
8-9 psi isnt a lot, and you can probably turn it up a bit once you get the car to leave hard...but its going to take 6+ psi off the line and some good suspension to go with it.
9 Second Club
Joined: Jun 2013
Posts: 271
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Have you played with the shock settings yet? On my turbo ls fox I found that it def needed to leave in boost to cut a good 60ft time, best was a 1.46 off the foot brake but with the denmah 3rd gear trick. I also made sure to tighten the fronts just a little so the front doesn't rise too fast and top out then start falling back down and unloading the rear. For the rear shocks I have it setup for tight compression and pretty loose on the rebound so it hits the tire pretty hard.
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I think you need a boost controller before you need a 2 step. You need to be able to control the boost to whatever you want on the TB. What good is a 2 step if you can't regulate launch psi to say 8psi?
TECH Fanatic
Joined: Jan 2010
Posts: 1,343
Likes: 2
From: South of Augusta,GA
Im sure you have a wideband, look at your AFR. Mt car was to rich on boost to launch, so I would bring it up to 0 on boost gauge, and it left better, or turn fuel down in low boost then ramp it in. Good luck.
17" drag radials aren't ideal, but can certainly go 1.4 60 ft with a good working suspension.
Which means tipping the end use more to the drag strip.
Is there a roll bar in the car? Hard to tell in the photos. Nice car.
Ron
Which means tipping the end use more to the drag strip.
Is there a roll bar in the car? Hard to tell in the photos. Nice car.
Ron
If I got a 2 step it should be possible to have turbo spooling but not in to full boost is what I'm trying to do.
Right now I run my rear arb at this track with some pre load on pass side and single adjustables set on 3 up front and 3 in the driver rear and 4 in passenger.
My main issue is really just trying to get the turbo spooled enough but not to much if that makes sense. It hits the 17s so hard off full 8.7 psi it may do a lot better with a 15 275 I understand that but I know it's possible to cut hood 60s with 17s just got to get the power down and to come in at the right time.
No roll bars. Just frame connectors, front strut tower bar and rear shock tower bar.
I have a boost controller on the car it's just about as low as it will go which is the 8.7 psi duty cycle is on 20%. At 60% boost goes to 19psi.
If I got a 2 step it should be possible to have turbo spooling but not in to full boost is what I'm trying to do.
Right now I run my rear arb at this track with some pre load on pass side and single adjustables set on 3 up front and 3 in the driver rear and 4 in passenger.
My main issue is really just trying to get the turbo spooled enough but not to much if that makes sense. It hits the 17s so hard off full 8.7 psi it may do a lot better with a 15 275 I understand that but I know it's possible to cut hood 60s with 17s just got to get the power down and to come in at the right time.
If I got a 2 step it should be possible to have turbo spooling but not in to full boost is what I'm trying to do.
Right now I run my rear arb at this track with some pre load on pass side and single adjustables set on 3 up front and 3 in the driver rear and 4 in passenger.
My main issue is really just trying to get the turbo spooled enough but not to much if that makes sense. It hits the 17s so hard off full 8.7 psi it may do a lot better with a 15 275 I understand that but I know it's possible to cut hood 60s with 17s just got to get the power down and to come in at the right time.
In the pics it looks like your car has very little extension in the front, You need all you can get with a limited drag specific suspension setup.
Not likely going to work like you think... The only way you will be able to make less than 8.7psi on a 2 step will be to have the RPM set for 2500rpm which will net in the car launching like a turd. You need to be in the converter with power pulled and ramp it in from there. A 2 step will definitely make launching the car more consistent. Throw one in the car and launch the car on 8.7 psi and see if it hooks.
In the pics it looks like your car has very little extension in the front, You need all you can get with a limited drag specific suspension setup.
In the pics it looks like your car has very little extension in the front, You need all you can get with a limited drag specific suspension setup.
Have you plotted the suspension? Do you know what your anti squat, instant centre are? I'm in the same boat that you are. I plotted my suspension and it was way out to lunch. I messed around with the ride height and it looks better now but I haven't been back to the track. Here's a pretty good write up on what you should be looking for.
http://www.yellowbullet.com/forum/sh...d.php?t=172353
http://www.yellowbullet.com/forum/sh...d.php?t=172353