Is there any reason NOT to go with an STS kit?
10-21-2008, 06:39 PM
#121
I had 4.11s and they were too much. From what I have seen on here 3.42s are probably the best with an m6. The cool thing is you can try it with what you have and see how you like it. If the spool is too slow, can pick which mod to change first. I didn't really notice that you had a 400+ cu in engine. That just might work. You might run into problems with backpressure. I say install the kit as the car sits, wrap the exhaust from the collectors back and see where you stand with a good tune. What turbo did you get? What is the A/R? You should consult the turbo gurus to see if it will work with all your cubes.
Who are the turbo gurus on ls1 tech?
10-21-2008, 06:48 PM
#123
What do you mean? I just wanted to know with my 408 setup weather I would spool a A/R 96 faster with stock exshaust manifolds or Long Tubes?
Thanks
Zombie I just want to pick your mind cause I respect the hell out of what you have done with your car and knowledge
Thanks
Zombie I just want to pick your mind cause I respect the hell out of what you have done with your car and knowledge
Last edited by 99Ls1fever; 10-21-2008 at 07:16 PM.
10-22-2008, 09:07 AM
#124
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manifolds Please listen to Zombie about the stock manifolds. That was the first thing I tried out and WOW what a difference. It would just be a waste to buy headers and be disapointed later. oh yea try to stick with a 2 and a half inch y-pipe stainless works has one. Your over axle can be a 3 inch but no bigger. Oh yea wrap the whole exaust all the way up to the turbo.
10-22-2008, 10:23 AM
#125
Please listen to Zombie about the stock manifolds. That was the first thing I tried out and WOW what a difference. It would just be a waste to buy headers and be disapointed later. oh yea try to stick with a 2 and a half inch y-pipe stainless works has one. Your over axle can be a 3 inch but no bigger. Oh yea wrap the whole exaust all the way up to the turbo.
10-22-2008, 12:33 PM
#127
That's opposite of what I would think (P=mRT/V, T goes down and P goes down). What am I missing? I'm just curious. I know the stock manifolds will be better and I would tend to believe you as one of the most experienced turbo and rear mount guys out there.
10-22-2008, 02:00 PM
#128
Question 1
K posing a question to the three of you and anyone else. I still have the stock exshaust mainfolds and y pipe. If I put them on will i have to much back pressure on my 408? i am running the texas giant cam 248/254, .611"/.613" , LQ9 heads as of now 72cc. 9.5 to 1 pistons, fast 90/90 intake ported to match heads. I have a M6, with 373 Gears.
2nd question
I really really like nitrous and want to run it. can i safely run nitrous? I have 150,125,100,75 shot jets. I want to get of the line fast hopefully buy spraying and getting the turbo to spool quicky and make good 1/4 times. My turbo is a 76mm and its A/R is a 96
K posing a question to the three of you and anyone else. I still have the stock exshaust mainfolds and y pipe. If I put them on will i have to much back pressure on my 408? i am running the texas giant cam 248/254, .611"/.613" , LQ9 heads as of now 72cc. 9.5 to 1 pistons, fast 90/90 intake ported to match heads. I have a M6, with 373 Gears.
2nd question
I really really like nitrous and want to run it. can i safely run nitrous? I have 150,125,100,75 shot jets. I want to get of the line fast hopefully buy spraying and getting the turbo to spool quicky and make good 1/4 times. My turbo is a 76mm and its A/R is a 96
10-22-2008, 04:22 PM
#129
The amount of exhaust molecules is static for this example. Hot gas = molecules are further apart in a given space vs cool gas. The exhaust is not a closed system though and has flow so I don't think P=mRT/V is really the correct equation.
higher temp = more energy
more energy = less exhaust needed to power the turbine
since you need less exhaust you can run a larger turbine wheel or turbine housing to bypass the extra exhaust past the turbine wheel or through a waste gate since it is not needed. This is what allows for the lower back pressure. You are doing the same amount of work with greater efficiency (less molecules).
Example:
1000F degree exhaust 45psi exhaust pressure to make 15psi boost, wastegate never opens
1600F degree exhaust 35psi exhaust pressure to make 15psi boost, waste gate open.
Someone please correct me if i'm incorrect.
