Modded LS1 to LQ9 with same mods. New tune needed??
09-16-2009, 08:14 PM
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Modded LS1 to LQ9 with same mods. New tune needed?? Hey everyone. I will be swapping from the LS1 shortblock to the LQ9 shortblock with the same heads, cam, & intake. The LS1 pcm has been tuned to these mods, but will I need to invest another $300 to tune it for the short block/18 cubes change? Granted I know the engine won't perform at its best with the same tune, but I wonder how the car would run with the same tune...
09-16-2009, 09:30 PM
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It will run, but it'll be off plenty. The compression of the engine will change, so will the cubic inches. You should at least have a way of monitoring it, but a tune should be done.
