Posted: Fri Aug 24, 2012 11:42 am Post subject: PCM upgrade or not?
I recently picked up a 9C3 2005 Impala. The car runs great. I just purchased a LSS full inst cluster, to replace my "taxicab cluster" since I will always be looking at it while in the car. I'm not really looking to do many upgrades, but I did install the STB's & Don Rome brackets. My racing days are over, & in the past, I'd install headers, aluminum intake, & carb, & B&M shift kit set for street. But it seems today all these improvements can be had with a "tuner" setting on the PCM. I did e-mail Overkill, but didn't hear back, so I'll post my question here. Again, the car runs great. But is it possible to get better low end pickup, stiffer shifts, & better gas mileage? While pulling out into street 40 mph traffic, & hardly pressing on the gas, the trans holds 1st, & 2nd nicely, doesn't stay in 3rd very long, but again, the engine seems happy doing this. Just installed a new 195 therm, coolant flush, & rad cap. Many people never change the cap, but that was my problem before changing it. The gage stays 2 marks below half, & that's fine. So will a reprogram improve shifts,low end pickup, & gas mileage? [is it possible to improve pickup & gas mileage] Or do I just say the car is running great, & leave it alone. My drive ratio is 3.29. I've always said if it ain't broke, don't fix it. Thanks for any help. GARY
I am lucky and live near overkill so with my mods did a incar tune with 91 octane and woke the car up bigtime, and at the same time if I am driving like a model citizen i get 36 mpg highway and 28 mpg in town.
Its worth every penny. If you can afford a 2.5''-3.0'' downpipe buy it. that gets rid of the u-bend and gives your a bigger downpipe.
I went the route of getting rid of the u-bend and keeping my stock downpipe, then later I wanted a bigger downpipe so it was a waste deleting the u-bend lols.[/b]
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