[Joe's_cool_1le]

So I just want to do some testing with swapping out my hi flow cats with the off road pipes. Really looking to see if they are too loud compared to what I have now.

So the question is do I need to a tune for this at all? Not worried about picking up power from it just yet but without a tune will it cause any issues?

Keep in mind I have a custom tune for the Whipple, Rotofab, 1 7/8 Kooks LT's w/ hi flow cats, and Kooks 3" exhaust.

I know I can throw them on and see how loud probably without a tune but I want to drive it for at least a few weeks which means lots of peddle to the floor action.

[Omega]

I don't see why you couldn't. If possible, keep an eye on the fuel trims and boost level during WOT.

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[SS Camaro Freak]

Yes.

You will have less restriction, Boost will drop, i would have the tune checked.

[Joe's_cool_1le]

Originally Posted by SS Camaro Freak

Yes.

You will have less restriction, Boost will drop, i would have the tune checked.

Others have mention that less restriction reduces boost but makes the system more efficient which can create more power.

What from a tuning perspective is normally addressed with this change? If your car was running a bit rich and you made this change would it lean it out a bit?

[Joe's_cool_1le]

Originally Posted by Joe's_cool_1le

Others have mention that less restriction reduces boost but makes the system more efficient which can create more power.

What from a tuning perspective is normally addressed with this change? If your car was running a bit rich and you made this change would it lean it out a bit?

Just to add to this. My only concern with watching my ATF gauge is that it isn't quite accurate. At least on idle (16-17) or cruising (bouncing from 14-15) but I did notice that at WOT the numbers get down in the low 11's. I'll probably address that before I make any decisions.

[Omega]

Originally Posted by Joe's_cool_1le

Just to add to this. My only concern with watching my ATF gauge is that it isn't quite accurate. At least on idle (16-17) or cruising (bouncing from 14-15) but I did notice that at WOT the numbers get down in the low 11's. I'll probably address that before I make any decisions.

Those numbers aren't bad. 11 is a bit rich at WOT, but thats safe and where the tuner/engine might like it.

What brand AFR?

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[Joe's_cool_1le]

Originally Posted by Omega

Those numbers aren't bad. 11 is a bit rich at WOT, but thats safe and where the tuner/engine might like it.

What brand AFR?

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It's am aem 30-4410. AEM said "Log in or register to post comments
Fri, 09/22/2017 - 09:59 Permalink
AEM_NS
Offline
Last seen: 1 day 16 hours ago
Joined: 06/06/2014 - 09:31
Can't say for sure based on
Can't say for sure based on your description alone but it sounds like you have an exhaust leak that's allowing fresh air into the exhaust making the AFR's read artificially lean. Might want to check your STFTs and LTFTs because if the UEGO is sensing a lean condition, then your stock O2 sensor probably will too which will affect your trims. It could also have to do with where the sensor itself is mounted now vs where it was before."

[1le32907]

Joe totally forgot to let know what my turner said when I brought the car in. He ran data logging on the o2 sensors and everything else he monitors he said everything is in check. He did advise that the sensor is farther back from where is was after the header install and that the sensor needs to reach a temp to work correctly and at idle might not be reaching that temp. So I think we are okay

Originally Posted by Joe's_cool_1le

It's am aem 30-4410. AEM said "Log in or register to post comments
Fri, 09/22/2017 - 09:59 Permalink
AEM_NS
Offline
Last seen: 1 day 16 hours ago
Joined: 06/06/2014 - 09:31
Can't say for sure based on
Can't say for sure based on your description alone but it sounds like you have an exhaust leak that's allowing fresh air into the exhaust making the AFR's read artificially lean. Might want to check your STFTs and LTFTs because if the UEGO is sensing a lean condition, then your stock O2 sensor probably will too which will affect your trims. It could also have to do with where the sensor itself is mounted now vs where it was before."

[Joe's_cool_1le]

Originally Posted by 1le32907

Joe totally forgot to let know what my turner said when I brought the car in. He ran data logging on the o2 sensors and everything else he monitors he said everything is in check. He did advise that the sensor is farther back from where is was after the header install and that the sensor needs to reach a temp to work correctly and at idle might not be reaching that temp. So I think we are okay

Glad to hear yours is alright but it does sound like it fixable. Really glad it wasn't the header gasket though. Mine does it not just at idle but cruising too. I'm definitely going to take mine to a shop to determine the cause and fix it so that it is accurate if I can't. Just sucks when you buy something suggested by a shop and they install it and they both don't read correctly. If this was a common problem I would have never wasted the money.

Who knows maybe my problem is a lot larger then the placement. Maybe my tune is just jacked. Would explain A LOT if it was.

[1le32907]

Originally Posted by Joe's_cool_1le

Glad to hear yours is alright but it does sound like it fixable. Really glad it wasn't the header gasket though. Mine does it not just at idle but cruising too. I'm definitely going to take mine to a shop to determine the cause and fix it so that it is accurate if I can't. Just sucks when you buy something suggested by a shop and they install it and they both don't read correctly. If this was a common problem I would have never wasted the money.

Who knows maybe my problem is a lot larger then the placement. Maybe my tune is just jacked. Would explain A LOT if it was.

What other issues are you having

[Joe's_cool_1le]

Originally Posted by 1le32907

What other issues are you having

At cruising (2500 or so) it bounces from high 14's to high 16's. When I go WOT it gets down in the 11's but still bouncy. Granted it reads a bit better at WOT but it still is bouncy, at least the reading is in a safe zone. But running way crazy to believe any of it is accurate and every time I look at the gauges it just burns me up that I paid for it.

[1le32907]

Originally Posted by Joe's_cool_1le

At cruising (2500 or so) it bounces from high 14's to high 16's. When I go WOT it gets down in the 11's but still bouncy. Granted it reads a bit better at WOT but it still is bouncy, at least the reading is in a safe zone. But running way crazy to believe any of it is accurate and every time I look at the gauges it just burns me up that I paid for it.

I’ve done a lot of reading the bouncing is normal and the 11.3 is where I am too

[Joe's_cool_1le]

Originally Posted by 1le32907

I’ve done a lot of reading the bouncing is normal and the 11.3 is where I am too

It didn't do it before my header installation. It was rock solid as to where my foot was on the peddle. AEM said what I was experiencing was not normal at all.

[laynlo15]

I wouldn't change them at all. I don't think you'll see much power gain and yes you might see a loss of boost.