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Start with 10 PSI?

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Old Oct 25, 2011 | 03:41 PM
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Default Start with 10 PSI?

It is a bone stock 2000 ls1. The waste gate came with 2 springs a 7-8 psi and a 10 psi spring. I do not want to run more then 10 psi. So I do not need a boost controller. Should I just start out with 10 psi? What octane gas should I run with 100% meth? Is 10 psi to much for the stock heads and block?


parts list
Modular turbo kit
78mm 81ar turbo
50 lbs injectors
255pump with hot wire kit
devils own meth kit single nozzle but also have the dual nozzle if I max out my m14 nozzle. running 100% meth
big ebay intercooler
JGE waste gate
M6 with 4.10's
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Old Oct 25, 2011 | 04:35 PM
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Start with the lowest boost spring you have, just because you have a 10lb spring doesn't mean it always will equal 10 lbs, it could be more or less. You will want to get rid of those 4.11's, they are horrible with a M6.
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Old Oct 25, 2011 | 09:50 PM
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i keep brakeing snap ring pliers trying to change the spring. i guess i will stick with the 7 psi spring. it sucks to change on the car so what ever i roll to the dyno that what i want to go with
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Old Oct 25, 2011 | 09:52 PM
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Keep the 7 psi spring in, and put a boost controller on it.
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Old Oct 25, 2011 | 11:38 PM
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You can also disconnect the boost reference port (bottom) and put a plug in the hole at the compressor. Will probably make about 10-11 psi that way. Just bring it up slow to make sure the boost doesn't get away from you and see where it ends up.
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Old Oct 27, 2011 | 01:19 PM
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i think i will stay with 7 psi just to be safe
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Old Oct 27, 2011 | 01:26 PM
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Since your running stock bottom end I'd keep it at a conservtive amount of boost (~7psi). Once you upgrade to better internals, that's when I think you should start running above 10psi. Good luck!
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Old Nov 5, 2011 | 07:30 PM
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89 octane and 100% meth a good idea?
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Old Nov 5, 2011 | 07:42 PM
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89? Why not atleast 91
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Old Nov 5, 2011 | 08:37 PM
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Originally Posted by mpatton
89? Why not atleast 91
I am air force its hard to find any thing over 89 over seas.
I want to tune for 89 and run 93
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Old Nov 5, 2011 | 10:16 PM
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I am turbo charging my truck engine. My waste gate comes with a 6lb spring and a 15lb spring. I will always start with the low spring just to make sure everything is going fine.

It is easy to change a spring in a waste gate. It is a lot harder to rebuild an entire engine.
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Old Nov 6, 2011 | 06:10 AM
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Why would you tune for 89 and run 93? Why not tune for 93 and run 93..
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Old Nov 7, 2011 | 06:41 AM
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It is hard to find any thing over 89 octane over seas.
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