u7146 canned tune and PI swapped 98 gt

[blueta]

I'm pretty sure on this, but want to confirm first. Can I use the stock 93 octane tune on my PI head swapped 98 gt? I'm thinking no since I have a bump in compression now because of the headswap (~10.4:1) compared to the regular 96-98's. Thanks

[dallasmustang]

Without going to a custom tune, the first thing I would "try" would be to load the 89/91 octane tune and run that with a wideband and listen for detonation. That might get you by, but you would be better off getting a custom tune from your CMR dealer of choice.