[06GTMustang89]

i have a pretty good feeling my air fuel ratio is off...my tune from brenspeed is just for an offroad midpipe and my jlt intake...but not for my lt headers. I know the headers affected the ratio a little bit...

My question is can i data log the car under WOT get the air fuel ratio...then change it via sct x2 accordingly??

[JakeM]

No. Brenspeed locks out all of those fuctions as this is Proprietary to Brenspeed.

Odds are you are running either just a tad lean or really close to where you should be. The only real way to tell though is to get a wideband on it.

I'm fairly certain most Brenspeed tunes are slighty to a good bit rich to begin with.

[06GTMustang89]

damnit lol i might as well just get it dyno tuned as ill get a better tune for the car...the car is also sticking in the rpm range lately..as in im going down the street and i go into neutral and the rpm stays up where it was in gear for like 5 seconds then starts to come down....

[JakeM]

Originally Posted by 06GTMustang89 damnit lol i might as well just get it dyno tuned as ill get a better tune for the car...the car is also sticking in the rpm range lately..as in im going down the street and i go into neutral and the rpm stays up where it was in gear for like 5 seconds then starts to come down....

If that is a option, do it. There isn't a shop close to me that I would trust tuning my car so I haven't done it yet. I am going to one of these days though. Probably be Straight Line Performance.. Near Chicago.

[06GTMustang89]

yeah i have Fastlane Motorsports in Benson, NC like 30 min away from me...they specialize in mustangs only...very reputable around here at least

[qwik48r]

lean it out to 13..

[JakeM]

Yeah... N/A most guys say around 13.2. Just at JPC says 13.8 for best torque I think.

[06GTMustang89]

i don't think i can with the sctx2 even if i data log it...so i have no choice but to go to the dyno...damn..its also my dd too so i don't want a radical air fuel ratio..i bet you im in the 12's on air fuel...

[chad05gt]

Originally Posted by 06GTMustang89 i have a pretty good feeling my air fuel ratio is off...my tune from brenspeed is just for an offroad midpipe and my jlt intake...but not for my lt headers. I know the headers affected the ratio a little bit... My question is can i data log the car under WOT get the air fuel ratio...then change it via sct x2 accordingly??

Call them, and get them to email you a tune (your tune) with it unlocked; I cannot think of any reason why they wouldnt.

If no luck, PRP software is less than a new dyno tune... DIY!

[DynoJoe]

Originally Posted by 06GTMustang89 i don't think i can with the sctx2 even if i data log it...so i have no choice but to go to the dyno...damn..its also my dd too so i don't want a radical air fuel ratio..i bet you im in the 12's on air fuel...

I can set you up with a tune for your mods and get the A/F ratio you are looking for.
The Sticking in the upper RPMs is a tuning issue most likely but it could be a dirty Throttle Body.


As far As A/F ratio's go, on N/A cars we are seeing better response and better numbers at the track with the A/F ratio in the 12.5-12.7 range.

[1FastFox]

Originally Posted by DynoJoe The Sticking in the upper RPMs is a tuning issue most likely but it could be a dirty Throttle Body.

Or clutch... Just thought I would mention it since no one else did.

[06GTMustang89]

Originally Posted by DynoJoe I can set you up with a tune for your mods and get the A/F ratio you are looking for. The Sticking in the upper RPMs is a tuning issue most likely but it could be a dirty Throttle Body. As far As A/F ratio's go, on N/A cars we are seeing better response and better numbers at the track with the A/F ratio in the 12.5-12.7 range.

i need to find out what my air fuel ratio currently is and once i do ill be in touch cuz i have a feeling fastlanes dyno tune is going to be too expensive haha

and i just cleaned the throttle body very thoroughly...

[DynoJoe]

Originally Posted by 06GTMustang89 i need to find out what my air fuel ratio currently is and once i do ill be in touch cuz i have a feeling fastlanes dyno tune is going to be too expensive haha and i just cleaned the throttle body very thoroughly...

I would also bet that you will be throwing some codes that deal with the O2 sensors since the tune probably didn't take into consideration the move of the front O2 sensors.

[06GTMustang89]

yeah i am cuz i get the slow response code every month or so...is the code coming up hurting my performance??

[DynoJoe]

Originally Posted by 06GTMustang89 yeah i am cuz i get the slow response code every month or so...is the code coming up hurting my performance??

It won't hurt it, but after too long it can take it's toll on the O2 sensor and they may need replacing.

[06GTMustang89]

i just wish there was a way to check my a/f ratio without spendin the 90 bucks on 3 dyno pulls...i know i sound cheap but money is pretty slim as of the right now..holidays killed it lol

[DynoJoe]

Originally Posted by 06GTMustang89 i just wish there was a way to check my a/f ratio without spendin the 90 bucks on 3 dyno pulls...i know i sound cheap but money is pretty slim as of the right now..holidays killed it lol

find someone to let you use their wideband and check it on the car.
LM-1 makes a good Wideband A/F Monitor pretty cheap, Dynojet's Wideband commander is another good one for on the car.

[06GTMustang89]

damn the LM-1 is 300 and the dynojet is 529...i can get a dyno tune for 300 ill figure something out before drag season this spring..

[2002BLGT]

Id take it to Fastlane , even if they are higher priced you get what you pay for and atleast they can put a wideband on it and get it adjusted to where it should be

[PAzYearazzUP]

Would the slow to react 02 sensor that is compromised cause the idle to hang? It does come back to idle, and you are not complaining about hard starting, so no air leak is my guess. But say the 2nd 02 sensor is sending a signal that might report information on a slower path to idle from the ECM is sorta what I am saying.