Drag race tune
Drag race tune How much timing can you safely pull at wot trying to slow a LS1 down? I tried pulling 9* without much affect( .15 et.) I am not sure how much I can keep going.
.5
Th350 5000 converter.I would likr to run 11.50 index.Just curious how far people have cut timing back.I went 11.07 at 18.5*.I was told kerp cutting it back.I can msybe shift at 5500 but it comes fast.
Th350 5000 converter.I would likr to run 11.50 index.Just curious how far people have cut timing back.I went 11.07 at 18.5*.I was told kerp cutting it back.I can msybe shift at 5500 but it comes fast.
That is one negative of getting away from the computer trans you cant make it short shift...you can definitely cut timing back several more degrees. you could also try richening it up or try restricting airflow ( keep tb from opening fully).
I haven't been a bracket racer so don't know the full implications but deep stage should slow it a bit since shallow makes them quicker...
I haven't been a bracket racer so don't know the full implications but deep stage should slow it a bit since shallow makes them quicker...
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TECH Enthusiast
Joined: Oct 2007
Posts: 530
Likes: 2
From: South Lyon, Michigan
Which is why I can't watch bracket/index racing.
Just back out of the throttle, We use timing to slow wheel speed down and take out way more timing than you do. When it starts to pull the timing out, you can hear it sound like it's laying over and falling on its face. Which you can then see on the G-meter and in the driveshaft trace.
Albeit, we make probably triple the power you do. But killing timing takes enough power out of it to get it to calm down and re-stick the tire. Obviously if its that far out of shape/out of the groove he'll abort like he should but you get the idea.
Just back out of the throttle, We use timing to slow wheel speed down and take out way more timing than you do. When it starts to pull the timing out, you can hear it sound like it's laying over and falling on its face. Which you can then see on the G-meter and in the driveshaft trace.
Albeit, we make probably triple the power you do. But killing timing takes enough power out of it to get it to calm down and re-stick the tire. Obviously if its that far out of shape/out of the groove he'll abort like he should but you get the idea.
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oh, yeah. I've read about people putting a bolt through the gas pedal and you can make it adjustable so that you're not running wide open.
You could also toy around with getting out of the throttle for a specified amount of time after high gear and then get back in it to kill time.
You could also toy around with getting out of the throttle for a specified amount of time after high gear and then get back in it to kill time.
You need to be careful with the throttle stop as the computer needs to see a minimum throttle amount to go to the WOT tables in the tune. I'd drop the shift rpm, let first shift to 2nd at something low and then keep dripping the timing. Don't make it unnecessarily rich, that just kills plugs and wastes gas. Otherwise add some weight to the car.
but he can adjust when it shifts period either by weights or manually ifs a manual valvebody. The point is your spark and commanded air fuel is different when you go WOT, so if you keep restrictions the throttle you may end up hurting something.
Correct.I went back to 100% and pulled -12* shifted at 6000 rpm and still went between 10.99 /11.02.The converter is flashing to 5020 so I can't shift much sooner. For now I am switching classes as our points series has started and it did not slow down as expected. New class limit 9.00 haha. Something to shoot for NOT!
I did not have enough time to retune the car as our points series started. I could of kept cutting back on throttle position but I needed to make sure it would still go into power enrichment. I was hoping to kill it with timing but did not workout as easy as expected.
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
Heh, stock engines have a 5k rpm delay for power enrichment. If you were implying that something catastrophic would happen by not reaching an x 1.15 fueling ratio, you'd be dead wrong. Running stoich at WOT wont cause engine damage, it may not make the most power, but wont hurt anything.