What difference in power and torque on a percentage basis is there from a stock CalPack to one that is correctly reprogrammed to the mods that are on the car. I understand it is inexpensive to burn chips but, how long does it take for the average "Joe" to get the programming right. I have a very basic understanding on how the prom controls the power making functions of the engine.

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89 IROC-Z 5.7L 2.77 GEARS
130,000 MILES
ALL FREE MODS
K&Ns FILTERS
FLOWMASTER MUFFLER
PERFORMANCE RESOURCE CHIP
AFPR & PORTED PLENUM
Best 1/4 E.T. 14.09 @ 97.2 MPH
Best 1/8 E.T. 9.09 @ 77.4 MPH
Best 60ft. 2.03

 

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Thats a loaded question, but seriously results vary by indivdual, both in understanding the data and how modified the particular engine is. Both MAF (165) and MAP (730) Ecms will adjust to most mild mods, eg porting the intake and better exhaust. But once you change to better heads, more agressive cam, the further the Ecm has to adjust, MAF's (165) are more forgiving to modifications, MAP (730) is more limited. Having said that, mind that is without changing the PROM. Burning a PROM that is matched to your particular setup brings many benifits, not just torque or horsepower, but better drivability and fuel mileage. Might suggest you read Traxion's article on burning, and Grumpy's Programming 101.


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79 Chevy Malibu Cpe
305 TPI/700-R4,3:50 Posi 9 inch,
Custom Turbocharged,
ported upper and lower intake,
214,224 duration .450I .465E lift
749ECM, modified SyTy software
currently being painted

[This message has been edited by SATURN5 (edited August 28, 2001).]