moosestang

What causes black soot? I did a google search using this site and found a couple of threads. Running rich seems to be the likely culprit, but what else? I had been running 93 octane with a 91 tune, but have since gone to strictly the 93 tune, could running the 91 tune with 93 gas cause black soot? I'm going to try and find a dyno shop near me cause I want to know if i'm getting all the performance I can out of this stang.

Is there anyway to see the A/F mixture ratio using the SCT tuner without using a laptop?

bushbanger

I have the same deal going on with Brents 93 tune ...but the s.o.b is running strong

cfr865

I've been having the same problem, also using Brent's 93 tune, I e-mailed him about the problem, he said some soot is normal. However he did send me a different tune with less fuel, I just loaded it in today so I'll see if it improves. I have heard the tuners do go on the rich side with there e-mailed tunes.

moosestang

probably for safety reasons.

I'm looking into a custom dyno tune from these guys http://www.blueovalchips.com/

Bulitt

i have it also brent said its normal let me know if that other tune helps thx.

slow07

Mine is bone stock, except for the axle-back, and it does it too.

SlappyGT

Simple carbon deposits from running a little rich. Running rich isn't a bad thing other than it might knock your mileage down a TINY bit, and you'll eventually get carbon build-up in your exhaust. If you run it hard enough at times though, you won't have to worry about build-up.

Rock36

I have a Bamachips 93 tune and I have carbon on my tailpipes as well.

I agree the email tunes are a little on the rich side for safety reasons.

Blazing Saddles

The soot will always be there and it is normal. On cold starts the engine runs rich until the coolant temp reaches 150 degrees. If the car didn't run rich on cold starts it would run like crap.

2006RedGT

No wonder my tailpipes are clean!