[hatzie]

Originally Posted by TooTall

Change the tire size in the PCM with HP Tuners. While you're in there firm up the shifts, shorten the shift times, change the PE delay, EQ ratio, copy your high VE table to the low VE table.

If you want to see a noticeable gain with out a ton of internal mods, get the 4 bolt intake (08 - and newer) with a LS3 throttle body. 20-25hp easily noticeable gains from that alone on 91 octane.

I'm reading up on how to make the shifting a little less mushy. I'd like to do it without shock loading and breaking internal parts when I've loaded the bed up or I'm towing. If re-programing it will not make it last longer and run cooler then it's not worth doing.

I already have two 91 octane cars, the Polara and the Impala, and the FE390 in my F250 that will likely need 91 or at least 89 to not knock like I have maracas under the hood. I like the fact that the LQ4 runs reliably on 87 octane with power levels on par with the 383 Big Block Chrysler in my Polara. I may eventually get the itch to play with it but not right now.