Tonights drag runs (in the nines)
Thread Starter
Joined: Aug 2011
Posts: 4,731
Likes: 815
From: Portland, OR
Tonights drag runs (in the nines) Well, got my hand slapped with a written warning last week for over 135 and no license. So like any good drag racer I turned it up a bit.
I added 5 psi base fuel pressure, rescaled the injectors and moved the WG springs up 3 psi. Doesn't seem to be an exact science.....
I had to retune the VE table a bit after the FP change just in the drive around stuff. So the goal at the track tonight was to make some runs and retune the VE under boost. I hadn't been to that part of the table yet.
First pass left easy shifted when the tires spun at the top of first into second short shifted to 3rd at 6200 and lifted just past the 1/8.. It went 113 in the 1/8 mile, up 5 mph from last week, and the log showed dead rich from 5000-6400. 10:1 to be exact. So I tweaked the table in those areas and went for another run.
Easy leave and once it hit 5000 rpm (185kpa) it blew the tires clean off and was on the limiter.
Gathered my thoughts with the intention of short shifting it at 5000, did it again. It literally goes from 5000 to 7000 in .3 seconds.
And that was my night.
FWIW, my slicks are new. And are radial 9x30 Hoosiers. When they spin like that they go into tire shake.
So I've created an out of control animal, and it's all your guys fault......
BTW, boost ended up right at 15psi. Its still rich, timing is at 16 degrees now. And it will only go faster at this boost level, if I can ever get it down the track that is.....
I think I'm paying the price of 3.73 gears and a 3 speed trans........even though I am fine rpm wise at the end of the track.
Ron
I added 5 psi base fuel pressure, rescaled the injectors and moved the WG springs up 3 psi. Doesn't seem to be an exact science.....
I had to retune the VE table a bit after the FP change just in the drive around stuff. So the goal at the track tonight was to make some runs and retune the VE under boost. I hadn't been to that part of the table yet.
First pass left easy shifted when the tires spun at the top of first into second short shifted to 3rd at 6200 and lifted just past the 1/8.. It went 113 in the 1/8 mile, up 5 mph from last week, and the log showed dead rich from 5000-6400. 10:1 to be exact. So I tweaked the table in those areas and went for another run.
Easy leave and once it hit 5000 rpm (185kpa) it blew the tires clean off and was on the limiter.
Gathered my thoughts with the intention of short shifting it at 5000, did it again. It literally goes from 5000 to 7000 in .3 seconds.
And that was my night.
FWIW, my slicks are new. And are radial 9x30 Hoosiers. When they spin like that they go into tire shake.
So I've created an out of control animal, and it's all your guys fault......
BTW, boost ended up right at 15psi. Its still rich, timing is at 16 degrees now. And it will only go faster at this boost level, if I can ever get it down the track that is.....
I think I'm paying the price of 3.73 gears and a 3 speed trans........even though I am fine rpm wise at the end of the track.
Ron
Last edited by RonSSNova; Jun 8, 2014 at 01:36 AM.
good running car ron
its making power . can you scale the timing back a couple degrees above 5000 to get some full runs in then bring it back in slow.
you might have to do some reverse tuning to get that 3.73 to hold.
I finally got time to put my et streets on and I think im going to go back to 8# boost to get some base runs in . its at 10# now I think im going to have a handful from a dead start.
its making power . can you scale the timing back a couple degrees above 5000 to get some full runs in then bring it back in slow.
you might have to do some reverse tuning to get that 3.73 to hold.
I finally got time to put my et streets on and I think im going to go back to 8# boost to get some base runs in . its at 10# now I think im going to have a handful from a dead start.
Thread Starter
Joined: Aug 2011
Posts: 4,731
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From: Portland, OR
Wasn't leaving hard, just rolling it out. The car dead hooked on these tires with the big block and spray. It ran 9.40's. Low 1.30 60ft.
When I get it to build boost at the line so it can plant the tires, it will be better.
Our track though is pretty horrible. Esp on street legal nights.
When I get it to build boost at the line so it can plant the tires, it will be better.
Our track though is pretty horrible. Esp on street legal nights.
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Wasn't leaving hard, just rolling it out. The car dead hooked on these tires with the big block and spray. It ran 9.40's. Low 1.30 60ft.
When I get it to build boost at the line so it can plant the tires, it will be better.
Our track though is pretty horrible. Esp on street legal nights.
When I get it to build boost at the line so it can plant the tires, it will be better.
Our track though is pretty horrible. Esp on street legal nights.
Nothing like having too much power and trying to control it for a pass. Isn't it fun though? Once you get everything to work, the launch, 60ft, 330ft, and finally down track.....hold on!
Thread Starter
Joined: Aug 2011
Posts: 4,731
Likes: 815
From: Portland, OR
Yes, it's a trip for sure.
In not 100% convinced that my check valve solution is working at this boost level. I'll go test Wed. Track will be better. And I'll just try to get it in high gear to tweak the boost AF first.
In not 100% convinced that my check valve solution is working at this boost level. I'll go test Wed. Track will be better. And I'll just try to get it in high gear to tweak the boost AF first.
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From: Ohio
Nothing wrong with running a TH400. The 3.73s are killing you though. I'd recommend a drop to a 3.55 at the minimum, but I would probably go even lower. The lower gear will make it much better to drive on the street as well. The only downside is getting it off of the line with the lower gear. In comes footbraking into boost....
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Hoosier Radials Ron,
Having spent the better part of my life running stock and super stock those tires serve their purpose great for that. But, I can see where that would cause lots of issues in your application. You are right they are incredibly unforgiving. Once they start to spin they don't recover. Especially if the track you are running on doesn't have great prep. Personally I would put a set of bias plys on it and problem pretty much solved.
I run radials on both my stock and super stock car but I have gotten to the point over the last couple years that if I don't have a heads up race or trying to set a record I leave them off the super stock car. They are just too finicky with the local tracks we have around here.
Good luck. I've been watching your progress close because I'm in the same position you are. Pretty new to the LS and forced induction world and my project is fairly similar to yours.
Rick
Having spent the better part of my life running stock and super stock those tires serve their purpose great for that. But, I can see where that would cause lots of issues in your application. You are right they are incredibly unforgiving. Once they start to spin they don't recover. Especially if the track you are running on doesn't have great prep. Personally I would put a set of bias plys on it and problem pretty much solved.
I run radials on both my stock and super stock car but I have gotten to the point over the last couple years that if I don't have a heads up race or trying to set a record I leave them off the super stock car. They are just too finicky with the local tracks we have around here.
Good luck. I've been watching your progress close because I'm in the same position you are. Pretty new to the LS and forced induction world and my project is fairly similar to yours.
Rick
Thread Starter
Joined: Aug 2011
Posts: 4,731
Likes: 815
From: Portland, OR
Rick,
Thanks for sharing your experience with the radials. I agree with you 100%.
The rat used them incredibly effectively even on poor track prep. But then I was able to plant them and go.
This is a whole different animal for sure.
Sounds like other than gears, tires, and my converter eventually, I'm set! Ha!
Sadly that money isn't in the budget at present. So I'll work on getting it to high gear so I can further refine the tuneup.
Good luck with yours. It's fun stuff and I'm frankly amazed at the power, and from what the others here who know keep telling me, I'm only tickling this combo at 15psi.
Ron
Thanks for sharing your experience with the radials. I agree with you 100%.
The rat used them incredibly effectively even on poor track prep. But then I was able to plant them and go.
This is a whole different animal for sure.
Sounds like other than gears, tires, and my converter eventually, I'm set! Ha!
Sadly that money isn't in the budget at present. So I'll work on getting it to high gear so I can further refine the tuneup.
Good luck with yours. It's fun stuff and I'm frankly amazed at the power, and from what the others here who know keep telling me, I'm only tickling this combo at 15psi.
Ron
9 Second Truck Club
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From: Colorado Springs, Co/ Central, Ca
A leaf spring turbo car is tricky unless track is perfect. I have yet to get my car on anything except a half *** or street night tnt track. Makes it hard because during racing if you set the shocks etc for a good track then it goes away and you're screwed. Set it for bad track and you're leaving ET on table or climbing for the sky. I just keep mine set for a loose track and take the launch rpm easy. You could try leaving in 2nd gear with a TH400 and 3.73.
Thread Starter
Joined: Aug 2011
Posts: 4,731
Likes: 815
From: Portland, OR
I don't have a manual VB. But if I put it in second, it will do the 1-2 shift around 4000rpm. That might work.
I've not progressed to where it will leave anywhere near boost yet. I really haven't tried to see how far it will stall before driving through the lights.
I've not progressed to where it will leave anywhere near boost yet. I really haven't tried to see how far it will stall before driving through the lights.
