Thread: which cantuned pcm can be tuned after install?

true I did jump right to informative info, but if you guys have to read as much as I do on a daily basis, as well as the amount of reading on this site of which I have done, sometimes "just getting to the facts Jack" gets the reader, and writer into the correct mental state.


The cat inefficiency post I thought was quite informative, and wondering could that have some effect on the p0420 code? Especially tied in with the coolant fans dtcs, could this be putting my computer into some kind of a reduction of power mode?
What do you think? I had my computer updated a while after I had it, long before the headers were put on, seemed to shift better, but didn't seem to last.....like the update didn't take. The upper intake gasket has been done sometime in the motors life, and no coolant leaking aroung intake, no little bubbles in radiator like a bad intake, or head gasket. It just seems like for some reason, sometimes if I'm out of the powerband, it's got no power whatsoever, then i can release the gas pedal, go wot, and all the power is back. Before headers, 28mph max in third gear would shift into 1st, after headers 32-34 mph max downshift, anything after that, it stays in 3rd gear, and boost pressure rapidly fluxuates from 5 to 7 psi.

Highest boost seen, 7-10 psi with factory exhaust/u bend delete, and cai.
Trans shifts fine. Up down, slow, fast, it seems fine.
It has far better throttle response at 1/2 pedal, than wot.
Where do you think is a good place to go from here?

For those who were wondering about starting with a 3.2" pulley, I have read multiple posts by you guys, and many were very good. My initial plan, even though I know I would be pushing my luck, would be the 3.2" pulley, and 1.9:1 rockers, without intercooling it, and without valve springs, and have it tuned to that. I do not want to install a new cam, or have valve issues above 6000 rpm to where valve springs are needed. The way it is running right now, anything smaller than 3.4" would be quite harmful. I would like a good, reliable tune, on a reliable pcm, and if I like the way it runs with the current mods I have, I may not even go smaller than stock, and just leave it the way it is.