2.0L Performance Tech 260hp (235hp auto) Turbocharged SS tuner version. 260 lb-ft of torque

Tune after downpipe?

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Old 10-13-2012, 07:05 PM
  #11  
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Originally Posted by frdfandc
I'm getting ready to order a down pipe for the SS. Would a tune be needed after installation? I know a tune will be the best thing, but not in the cards yet.
Car already has the GMTU kit on it.
No tuning needed, it's just a DP.

Also LNF DI motors make the best power at 13.03 AFR, which
Is .89 Lambda
This would be really lean, on a non DI engine.
I've been at .89 lambda, for at least a year now.

No such thing, as learn down, so it can't be turned on or off.
Our ECM is torque based.
The ECM will not let you have more, than the program, or 'tune', allows.
The ECM is constantly adjusting, to it's 'target' torque limits.
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Old 10-13-2012, 08:15 PM
  #12  
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Originally Posted by 2005HHRauto
No tuning needed, it's just a DP.

Also LNF DI motors make the best power at 13.03 AFR, which
Is .89 Lambda
This would be really lean, on a non DI engine.
I've been at .89 lambda, for at least a year now.

No such thing, as learn down, so it can't be turned on or off.
Our ECM is torque based.
The ECM will not let you have more, than the program, or 'tune', allows.
The ECM is constantly adjusting, to it's 'target' torque limits.
13.03 AFR? Sounds pretty fat. Do u mean with e47?
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Old 10-13-2012, 08:22 PM
  #13  
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Originally Posted by XtremeSS
13.03 AFR? Sounds pretty fat. Do u mean with e47?
.88 is best with 91/93
.89 is best with E47.5
It's so close
That kind of leanness would be bad for non DI engines...
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Old 10-13-2012, 08:57 PM
  #14  
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Originally Posted by XtremeSS
How lean was it? What was your AFR at the time?
They didn't say what the actual AFR was & it's not on the print-out they gave me, what I do know on the second pull the HP dropped 50 & the TQ dropped 55 from heat soak (stock intercooler).
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Old 10-14-2012, 08:20 AM
  #15  
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have a hahn dp with cat for $100..anyone?? opps wrong section lol.
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