GMS1 dilemma??
#1
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Join Date: 03-10-09
Location: Bridgewater, NJ
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GMS1 dilemma??
Lots of people talk about the gms1 tune "dying" after 5K rpm's. I never thought about although I myself have had this tune for a few months. Guess I never noticed this weakness til lately....... Yes guess it is so, I did notice a weakening past a certain rpm. So my question , how can I remedy this without another tune on top AND without voiding warranty? Cold plugs, short ram, downpipe?
#2
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Tune or bigger turbo. The GM tune protects the turbo at high rpm's by keeping it from overspooling.
The stock turbo runs out of oomph above 6500 rpm anyway. My 27-24 psi tune tapers to 18psi at 7k. More flow than the tiny turbo can keep the pressure up for. They run the tune too lean in the high load mid rpm range for emissions sake also.
The stock turbo runs out of oomph above 6500 rpm anyway. My 27-24 psi tune tapers to 18psi at 7k. More flow than the tiny turbo can keep the pressure up for. They run the tune too lean in the high load mid rpm range for emissions sake also.
#3
Senior Member
I think the question is does the gms1 tune still
make more power than stock even after it drops off? If it does then I wouldn't worry about it... It's still plenty fast IMO
make more power than stock even after it drops off? If it does then I wouldn't worry about it... It's still plenty fast IMO
#5
Senior Member
If you look at the dynos before and after it drops to within 2-3 whp of stock power above 5800 or so. Tuning on top helps a lot but GM still has it clamped down some as far as airloads are concerned. Dang torque limiting features. Putting the adjustable pill back on with the Modded stage 1 tune. That will fix it.
#6
Senior Member
If you look at the dynos before and after it drops to within 2-3 whp of stock power above 5800 or so. Tuning on top helps a lot but GM still has it clamped down some as far as airloads are concerned. Dang torque limiting features. Putting the adjustable pill back on with the Modded stage 1 tune. That will fix it.
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