Thread: Tuning for a 3.5" pulley upgrade

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  1. #11 Re: Tuning for a 3.5" pulley upgrade 
    GT Level Member jdmgtp's Avatar
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    I have similar mods to you but I have a catback and 1.9 rockers which don't make much a difference in tuning. I start at 20 degrees of timing and 11.5:1 a/f at the bottom of 1st gear and richen up to 10.8:1 with 16 degrees by the top of second. Richening it up and pulling timing a couple degrees are the only way I can run knock free at the top of 2nd. It's possible my valves are still carbon'd up. Some cars can run more timing and leaner mixtures some less, you'll have to see what your car will allow.

    When tuning a knock prone car I like to start at 11.0 a/f ratio and progressively add timing. This gives me an idea of what timing it will like with leaner mixtures. Try running 11.2 a/f ratio and stock timing as a starting point and see if you get knock. If you can't run at least 11.0 a/f ratio and stock timing you might need more mods.

    Also, I'd like to see a better scan. Something like this: get up to 45mph, put the trans in 2nd gear and progressively go into WOT. Take about 3 seconds to go from idle to WOT. This will take ae and shifting out of the equation.
    Last edited by jdmgtp; 12-18-2011 at 07:02 PM. Reason: more info
    2000 GTP, 3.2 pulley, SD headers, 3" exhaust, modded 1.9's, custom CAI, LS6 maf, ported blower/ TB, HPT, 65 lb injectors, E85 in the summer, LM-1 wideband, 180 stat, autolite 104's, GMHD suspension kit. 13.2@104 on street tires w/o ported s/c
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