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**DirtyD** · 02-07-2014, 12:35 PM

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?

You, you will need a tune when you delete the cats. If not, the car will run open loop and just dump fuel trying to cool the cats that aren't there anymore. You will run rich and get horrible gas mileage and a putrid smell.

re-rx7 · 02-07-2014, 12:44 PM

Originally Posted by DirtyD

You, you will need a tune when you delete the cats. If not, the car will run open loop and just dump fuel trying to cool the cats that aren't there anymore. You will run rich and get horrible gas mileage and a putrid smell.

Your talking about COT protection. It only happens on Decel. Rear 02's do not control anything. they have a voltage reading of .1 to 1. The front Wideband 02's read .1 to 5 volts they would tell the ecu to run in open loop.

**Courtesy Flush** · 02-07-2014, 01:12 PM

Originally Posted by re-rx7

Your talking about COT protection. It only happens on Decel. Rear 02's do not control anything. they have a voltage reading of .1 to 1. The front Wideband 02's read .1 to 5 volts they would tell the ecu to run in open loop.

Im not speaking for the rest, but a good tune has more done than just turning off COTP & nannie lights on these cars with no cats. Thats just one part of it.

**TrueStreetTim** · 02-07-2014, 04:26 PM

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 · 02-07-2014, 04:31 PM

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** · 02-07-2014, 05:18 PM

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** · 02-07-2014, 10:16 PM

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

**GTOphil** · 02-07-2014, 01:35 PM

So nobody else has an opinion about just staying with the Bama tune if I'm pretty much stock?

And D- if Ford determines that it's not the tune and the tune didn't cause it, then they can't void the warranty for having a tune if the tune didn't cause it.

I'm not worried about that- just saying.

**Courtesy Flush** · 02-07-2014, 01:53 PM

Originally Posted by GTOphil

So nobody else has an opinion about just staying with the Bama tune if I'm pretty much stock?

And D- if Ford determines that it's not the tune and the tune didn't cause it, then they can't void the warranty for having a tune if the tune didn't cause it.

I'm not worried about that- just saying.

If you're happy with the car and the way it runs, stick with your bama tune. Axelbacks do virtually nothing for performance enhancement, so your car is essentially stock with a tune. Switching to another tune is an option but not necessary.

If you just want more information about the status of how your car runs...datalog.datalog.

re-rx7 · 02-07-2014, 01:57 PM

Agreed 100%.

**GTOphil** · 02-07-2014, 02:02 PM

Originally Posted by Courtesy Flush

If you're happy with the car and the way it runs, stick with your bama tune. Axelbacks do virtually nothing for performance enhancement, so your car is essentially stock with a tune. Switching to another tune is an option but not necessary.

If you just want more information about the status of how your car runs...datalog.datalog.

Yep that's what I'm doing. I just got off the phone with Bama.

I'm going to see what they want done and send it to them- and then do it again when it's warm I guess. I'm not sure what differences a datalog at 30 degrees will have that may affect the tune at 100.

Yeah- I don't mind being stock with a tune for right now- it still doesn't "feel" slower than my GTO did with 430 (fat pig and top end cam). I'm saving for a s/c and doing all my power at once.

**DirtyD** · 02-07-2014, 02:47 PM

Originally Posted by GTOphil

Yep that's what I'm doing. I just got off the phone with Bama.

I'm going to see what they want done and send it to them- and then do it again when it's warm I guess. I'm not sure what differences a datalog at 30 degrees will have that may affect the tune at 100.

Yeah- I don't mind being stock with a tune for right now- it still doesn't "feel" slower than my GTO did with 430 (fat pig and top end cam). I'm saving for a s/c and doing all my power at once.

Car might add/pull a little timing, but not much.

Do you have an auto or manual?

**GTOphil** · 02-07-2014, 02:55 PM

Originally Posted by DirtyD

Car might add/pull a little timing, but not much.

Do you have an auto or manual?

A6.

Downloaded everything from SCT I need to datalog.

**DirtyD** · 02-07-2014, 02:45 PM

Originally Posted by GTOphil

So nobody else has an opinion about just staying with the Bama tune if I'm pretty much stock?

And D- if Ford determines that it's not the tune and the tune didn't cause it, then they can't void the warranty for having a tune if the tune didn't cause it.

I'm not worried about that- just saying.

Sadly, they still will. A dealership won't be able to go as deep as Ford themselves will into determining the failure, but knowing that you've tuned the car, even if it didn't directly cause it, good luck trying to convince them otherwise.

**GTOphil** · 02-07-2014, 02:55 PM

Originally Posted by DirtyD

Sadly, they still will. A dealership won't be able to go as deep as Ford themselves will into determining the failure, but knowing that you've tuned the car, even if it didn't directly cause it, good luck trying to convince them otherwise.

Isn't the law that if they determine it wasn't the tune then they can't void the warranty for something they just said didn't cause it?

I don't see how that's right. Either way I don't have a warranty other than factory.