Tuning Conundrum

[TrueStreetTim]

Originally Posted by re-rx7 Tim would you say a Tune is needed with a O/R X or H? From what I've researched the COT protection only kicks in on decel? The worst I can see happening is you run a tad bit richer and a check engine light. SOme tunes like AED and such have specified they dont change anything just remove the Check Engine light? Input?

When you remove the cat's with no tune changes, it indeed becomes rich. But it actually over-richens itself so much so that it's a power losing state of richness. It exhibits that state under cruising, WOT the whole bit. Not just decel.

So, yes. If you delete cat's you'll need to make more changes to the computer than the car is able to handle on it's own or simply turning off a code.

OP; if you've already paid for a tune and need changes for O2's to be made etc. call SCT and have them make the changes and go from there until your ready for custom. Axle-backs need no changes as they are post O2 and you won't experience CEL's.

[re-rx7]

Originally Posted by TrueStreetTim When you remove the cat's with no tune changes, it indeed becomes rich. But it actually over-richens itself so much so that it's a power losing state of richness. It exhibits that state under cruising, WOT the whole bit. Not just decel. So, yes. If you delete cat's you'll need to make more changes to the computer than the car is able to handle on it's own or simply turning off a code.

Thanks for the input Tim.

[GTOphil]

Originally Posted by TrueStreetTim OP; if you've already paid for a tune and need changes for O2's to be made etc. call SCT and have them make the changes and go from there until your ready for custom. Axle-backs need no changes as they are post O2 and you won't experiencce CEL's.

Thank you for the response. I had the axle back when I got the tune/tuner from American Muscle/Bama...so the tunes are the same and I don't need changes.

I guess I just kinda got spooked by some of the guys on here talking about #8 this and canned tunes that.

Having said that I DO realize a custom tune is best (had my GTO tuned for every little thing I changed) but since I'm so close to stock it seems as if everybody suggest Bama is fine for now.

The only reason I want to datalog is to ensure the tune is plenty safe- though they did say they made some changes to their tunes since last summer so I won't be opposed to extra power.

The two MAIN reasons for a custom tune would be to ensure safety and get more power if possible.

[Soulowd]

GTO just posted better Dyno results so you can read them better man