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Old 01-06-2020, 04:55 PM   #3
Scooby Guru
Member#: 80649
Join Date: Jan 2005
Chapter/Region: South East
Location: Columbia, SC
2000 2.5 Auto-X RSTi


Originally Posted by Waddlz View Post
Your engine builder should tell you that.

if you want to stay safe. 6500 RPMs and 15 psi on a 20g is a good number.

If you're running reasonable clearances and good oil on what appears to be good valves/springs then 7,200-7,500 is a likely upper limit on "safe" RPM for a low level built engine.

The 20G is going to be perfectly fine with 22 psi, but that one should be up to your tuner. Boost is not a good thing to measure by. If your tuner sees high temps then a few psi lower will be safer. Tell him/her what you want (conservative, conservative but with a little hot sauce, not conservative, pull the pin and toss it, etc) and let them tune from there.

For reference, I just finished assembling mine, set the limiter to 7,500 and will let the turbo do it's thing until the TMIC get's too hot.
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