Making a turbo spool sooner?
Making a turbo spool sooner? Is there anything you can do to make a turbo spool at lower rpms? I already have heat wrapped entire hot side. My tune isn't 100% dialed in and is running rich, but the turbo spools slower than I thought it would.
I have a 02 camaro with ls1 front mount kit, 7875 turbonetics on e85. It has a cam that the car came with and i realize could be hurting spool time. I also have a 3500 stall and thought by the time it flashed the turbo would be spooling pretty hard but it takes a bit. (its not slow or horrible I'm being picky and was wondering if i could get it faster)
I was thinking about retarding the timing at the point in the tune where the engine stalls to with the brakes on. It would add heat to help spool, and I need to lean it out a bit. Any other ideas?
I have a 02 camaro with ls1 front mount kit, 7875 turbonetics on e85. It has a cam that the car came with and i realize could be hurting spool time. I also have a 3500 stall and thought by the time it flashed the turbo would be spooling pretty hard but it takes a bit. (its not slow or horrible I'm being picky and was wondering if i could get it faster)
I was thinking about retarding the timing at the point in the tune where the engine stalls to with the brakes on. It would add heat to help spool, and I need to lean it out a bit. Any other ideas?
you could look into a spool valve or flange.. basically blocks half the turbo and diverts all the exhaust into the one side. I have used them on diesels with good success but I think you would have to put a weaker spring or diaphragm on to be in gasser type boost.
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The right kit will help, cam is big but also mess with the tune that will wake it up. You said its running rich so that's hurting you right there. Lean it out get some heat in there see how it does.
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spool valve is only an option if it's a twin scroll turbine housing.
The tune is going to play a big role in how the turbo reacts, as stated so is the cam. You could try to advance the cam.
Running rich will help spool because the excess fuel gets burned in the exhaust adding to turbine work.
What are the hotside and turbine specs?
The tune is going to play a big role in how the turbo reacts, as stated so is the cam. You could try to advance the cam.
Running rich will help spool because the excess fuel gets burned in the exhaust adding to turbine work.
What are the hotside and turbine specs?
The smaller hotside piping isn't going to help that much. Doubt its twin scroll if he's having spool issues. Not to bring up my own but I have a 2.6id pipe into a divided housing and spools almost instantly. The right combo goes a long way. Hes probably got a lot of things working against him
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I'm running a 7875 tnetics with a 1.15 a/r and a 3 inch pipe pre turbo. Cam in mine is a 238/242 .605/.605 112lsa I do believe. I would say it is your tune. I'm no expert by no means but it seems the way your timing curve is layed out could play a pretty big roll in how it spools. Someone correct me if I'm wrong.
Makes 1# of boost instantly if you stab the throttle. That was with the 6 speed, with the th400 it is the same really.
I could dog it in 5th at 50mph and it would make 5#+ at 1500 rpm passing traffic
Makes 1# of boost instantly if you stab the throttle. That was with the 6 speed, with the th400 it is the same really.
I could dog it in 5th at 50mph and it would make 5#+ at 1500 rpm passing traffic
Last edited by 95bowtie; Nov 5, 2013 at 04:27 AM.
Seriously a quick valve for a 7875, it's not needed, that is just funny to me.
You need to get the setup done right, no reason that turbo shouldn't light off instantly. Tune, converter, cam, and kit built RIGHT and it'll spool instantly.
You need to get the setup done right, no reason that turbo shouldn't light off instantly. Tune, converter, cam, and kit built RIGHT and it'll spool instantly.
Exactly! Something isnt right in the set up.
My setup is as follows: stock ls1 with head studs and some cam i don't know specs. Cast manifolds with front mount kit using 2.5" piping, then 3" exhaust out of turbo all the way out to a 3" slp loud mouth. I have the 7875 turbo with .96 a/r housing, and 3" cold piping and 4" intercooler core front mounted.
I am running on e85 with a 4l80e and 3600 revmax billet torque converter and 9" with 3.25 gears. Also i am at high elevation (5000ft), so have less air than sea level to spool turbo.
I don't want any higher stall converter, this is a street car that occasionally will see track. The spool valve seems cool but I don't know if I can fit a 3/4" flange on my turbo (which is twin scroll) as I had a hell of a time fitting it with out standing up radiator as is, but I do like that idea of it. Seems expensive though.
I am running 13 degree's of timing (started low as I am initially dialing in ve), and I start pulling timing once boost starts to build, and I put it into PE mode about the same time. BTW, I have it kick into PE mode around 12psi map pressure as my map reads 12.3 psi with key on engine off, so anything above 12.3 is boost pressure.
Does anyone have an example of their spark timing and fueling as a guide? If someone could post a snap shot of their logs I'd like to see how fast their turbos spool, and the timing and fueling when it does. I will have to get my other computer later to post a snap shot of the logs I took this weekend.
I am running on e85 with a 4l80e and 3600 revmax billet torque converter and 9" with 3.25 gears. Also i am at high elevation (5000ft), so have less air than sea level to spool turbo.
I don't want any higher stall converter, this is a street car that occasionally will see track. The spool valve seems cool but I don't know if I can fit a 3/4" flange on my turbo (which is twin scroll) as I had a hell of a time fitting it with out standing up radiator as is, but I do like that idea of it. Seems expensive though.
I am running 13 degree's of timing (started low as I am initially dialing in ve), and I start pulling timing once boost starts to build, and I put it into PE mode about the same time. BTW, I have it kick into PE mode around 12psi map pressure as my map reads 12.3 psi with key on engine off, so anything above 12.3 is boost pressure.
Does anyone have an example of their spark timing and fueling as a guide? If someone could post a snap shot of their logs I'd like to see how fast their turbos spool, and the timing and fueling when it does. I will have to get my other computer later to post a snap shot of the logs I took this weekend.