Quote:
Originally Posted by King Nothing
Hmmm not what I’ve been told by someone who’s tuned these cars many times. Also, being stuck in California an LS9 cam can be run on a stock LS3 tune if need be. Hopefully this year I can upgrade my cam and boost to 10psi on my 2300 and I’m hoping to be at 550-570rwhp through stock manifolds and cats.
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FWIW I do camshafts and tuning for a living - the LS9 cam is not picking up 50whp in a naturally aspirated build like we're discussing for the first phase of EasternPine's build, or even if he adds a blower. Maybe I lowballed a little at 10whp, but definitely not more than 20whp.
With an LSA blower the gains would be magnified, and the LS9 cam suits a PD blower well. I still would not expect to see a 50whp gain, but maybe 35whp, and extending the curve up top with significantly better average power.
I do think you could potentially run an LS9 cam with a stock LS3 tune for the purposes of passing a state inspection. They have very similar amounts of overlap and likely wouldn't bother the calibration much at idle and light cruising. I wouldn't go putting my foot in it hard, as the power enrichment fueling will need changes for sure.
To be clear, I don't think the LS9 is a bad option - especially where emissions are strict and the mod police are looking for anything they can find to ding you on. I'm just suggesting being realistic about the gains.