jstreet0204 said:Sugesting an aftermarket MAF is BAD advice!!! The stock MAF is more than fine for his setup. You don't need to upgrade the MAF until you max the stocker out, somewhere around 350 rwhp, and even then you are better off going with a OEM unit like a LMAF. First aftermarket Maf's are harder to tune, and second, he doesn't have access to a dyno shop anyway.
To answer the original question, you should not be running lean with the listed mods, unless you have introduced a vaccuum leak somewhere. Otherwise you are fine.
Most of the people on this board to not have a good understanding of how MAF based fuel injection works.
i kinda knew the MAF advice didnt seem right. As everyone knows if there is MORE air coming in the engine (CAI, TB and plenum) the MAF will read this and give an order to the fuel injection to let more fuel in , rightjstreet0204 said:Sugesting an aftermarket MAF is BAD advice!!! The stock MAF is more than fine for his setup. You don't need to upgrade the MAF until you max the stocker out, somewhere around 350 rwhp, and even then you are better off going with a OEM unit like a LMAF. First aftermarket Maf's are harder to tune, and second, he doesn't have access to a dyno shop anyway.
To answer the original question, you should not be running lean with the listed mods, unless you have introduced a vaccuum leak somewhere. Otherwise you are fine.
Most of the people on this board to not have a good understanding of how MAF based fuel injection works.
Newbie143 said:i kinda knew the MAF advice didnt seem right. As everyone knows if there is MORE air coming in the engine (CAI, TB and plenum) the MAF will read this and give an order to the fuel injection to let more fuel in , right
I mean we all know that , so why the hell would people run lean with this???
What is your educated guess based on? Which component do you think bypasses or throws off the MAF so that the eec know longer knows the amount of air entering the engine? I'm not try to be an ass, just trying to get you guys to think about this stuff. Even if the MAF calibration was off a little, you still have an adaptive stategy in the eec that makes corrections based on prior o2 readings.Give Me TP said:Do you think he's not running somewhat lean with the mods listed, maybe around 14-14.5? That would be my educated guess.
BCB00GT said:Depending on the type of CAI (plumbing before the MAF), he could run lean or rich - most likely lean.
Getting an aftermarket MAF is a bad idea as mentioned earlier.
I would ditch the CAI and get the plenum and TB, as the CAI doesn't add much anyway considering the cost and "unknown" a/f factor.
christiesledd said:I said he's running lean because my car was running 20% lean when I had it dynoed and i believed a lot of that was due to the tb and plenum, I know everyone says these cars can compensate for a lot of the mods, but I don't agree fully. If not why would people gain 30rwhp and 40 rwtq in certain places in the power band when the a/f is adjusted
jstreet0204 said:What is your educated guess based on? Which component do you think bypasses or throws off the MAF so that the eec know longer knows the amount of air entering the engine? I'm not try to be an ass, just trying to get you guys to think about this stuff. Even if the MAF calibration was off a little, you still have an adaptive stategy in the eec that makes corrections based on prior o2 readings.
Knock sensors wouldn't change any correction factors, adaptive learning is based on o2 readings durin closed loop operation. Again If you ran that lean, something isn't working like it should. You either have unmetered air getting in somewhere, or there is a problem with the MAF.Give Me TP said:My guess was based on dyno results I experienced. Using the stock tune with an aftermarket catback, midpipe, and CAI my A/F ran high 14s to 15, which the eec never corrected. Granted I have knock sensors that may have overriden the need for the eec to correct for a lean condition.
Give Me TP said:A custom tune corrected the situation. It's run a virtually flat 13 A/F over the past three months. Unmetered air would likely be revealed at idle, which has remained unchanged over the past year and a half.
Good links by the way
I don't have direct experience with either, but all the tuning packages do basically the same thing. The parameters are in the EEC not the software. The software just allow access to them. From everything I've seen, where SCT excels is the easy to use interface.Give Me TP said:Sounds a little familiar, since when I was in the process of custom MAF voltage was datalogged. What has been your experience with custom tuners by the way? For instance have you found SCT or Diablo software to perform in similar fashion or is one notably better for fine tuning.
It is called road tuning and in many ways is better than dyno tuning, but it takes time and the equiptment to do it. Many people do it though, my self included.Torinalth said:here is a question... a mustang dyno is more or less holding your car in place while giving the situation of it actually being in motion based on drag and weight.
so, couldnt he go the route of getting his own wideband sensor and dial it in himself with the tuner? maybe i'm thinking too simply here... but get the car rolling in third, at around 2k rpm watch the wideband, and put the hammer down. when at 6k, shut down, tune, check the progress.
call it the poor mans dyno, but i dont see an issue with going this route.... other then the cost of the wideband.
Torinalth
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