[Flavian]

Ive got a 86 Mustang GT with a 93 347CI Roller motor in my car and I just added a novi 2000 and Im currently running about 8psi. Ive got an after market paxton fuel regulator and have the car set at about 50 psi right now. I took the 24lb injectors out the other day and put in some 42lb injectors and now the car is running extremely rich. I know I need to get the ecm tuned to my specs on the car but I was curious is there anyone that has like mail order tunes or whats the best route to go about getting this fixed so I car drive the car again because its just dumping raw fuel and sluggish now.

[HMUSN]

you need a dyno tune man.

[Flavian]

Yea Ive got an appt to get it dyno tuned its just theres a pretty long wait and I was just curious if there was anyway to get like a mail order tune just where I could drive it around..

[HMUSN]

i personally don't like mail order tunes but you might be able to get one until you dyno it.. just be very easy on the motor. don't let it get into boost.

[Flavian]

Yeah thats what i want to do till i get it on the dyno... who is a good brand to go with on a mail order tune?

[Justincredible]

Originally Posted by Flavian Yeah thats what i want to do till i get it on the dyno... who is a good brand to go with on a mail order tune?

A mail order tune is only a temporary "bandaid" so to speak.

Ive seen quite a few new engines ruined due to mail order tunes.

A dyno tune on a loading chassis dyno is the only way to go. Period.

Anything less is just a shot in the dark.

[Mr_Evil]

uhhh.... Drop your fuel pressure. You should be able to get it with in range. But I had a Cadillac that would go all screwy' on me with different sized injectors. Someone said it is because when the fuel ratio changes to much the car will go into limp mode (O2 sensors aka lambda sensor). But if your car wont go into limp mode, just drop your fuel pressure with an adjustable regulator. You should be able to get it where it is not to rich. But you will still be running the base/stock fuel map/curve, so you really need another ECU.

[1slo5.0]

Where are you located? I can't believe there is only one place that can tune a Mustang.

[twinturbo]

Originally Posted by Flavian Ive got a 86 Mustang GT with a 93 347CI Roller motor in my car and I just added a novi 2000 and Im currently running about 8psi. Ive got an after market paxton fuel regulator and have the car set at about 50 psi right now. I took the 24lb injectors out the other day and put in some 42lb injectors and now the car is running extremely rich. I know I need to get the ecm tuned to my specs on the car but I was curious is there anyone that has like mail order tunes or whats the best route to go about getting this fixed so I car drive the car again because its just dumping raw fuel and sluggish now.

Your frequency based MAP sensor car will not be able to recognize boost at all, so converting to MAF, so the boost can be registered by the ECM, and tuned correctly will be a good idea, if not already done or planned for.

MAKE sure the maf is not calibrated for any injector, larger than 24#, or the load scaling will be extremely off, from the quantitative errors in calculation. For example, a maf calibrated for 42# injectors, where it was originally calibrated for 19"s will results in the load calculations using less than a fourth of the normal scale. This will result in detonation, poor driveability, and difficult fuel control. If you have a competent tuner, they will account for this, but you still will have closed fuel control and driveability problems.

[Mr_Evil]

MAFS are not calibrated. ECU's are adjusted.

[1slo5.0]

Originally Posted by Mr_Evil MAFS are not calibrated. ECU's are adjusted.

What? I hope I'm misreading your post because Mass air sensors are calibrated to injector sizes.

[Mr_Evil]

You hoped wrong. You dont know what your talking about. No they are not, All sensor readings are taken in by the ECU. You can put resistors in the signal line to change its frequency, which in turn could cause you ECU to adjustl. But a stock ECU will n0t vary much off of the base/stock fuel map no matter what sensors or injectors you have. I could go on to tell you how wrong you are, but i will stop there.

[Tony_90fox]

i know the SCT meter isnt calibrated, but i thought other meters were! could somebody clear this up for me?

[Mr_Evil]

In a way I wish they were. But they are not. You have to get something that will ether manipulate all your sensor readings like a piggyback ECU, or a partial piggyback ECU that can independently control your injectors and fuel map, or get a stand alone after market ECU.

Larger MAFS are just larger to allow more air through them. You can take the sensor out of a MAFS and put it in a bigger pipe if you need to (seen it done b4). The sensor in them are usually all the same or really close. The frequency range that the MAFS operates at may vary from brand to brand. You may find a MAFS thats frequency range is different, so the ECU thinks more air is coming in, and it gives a little more fuel to compensate. Or visa versa, causing it to run lean. The early MAFS's had an adjuster screw that would allow you to make slight changes so you could tune your car a little with it. But the newer ones do not. I assume they were removed for "emissions" reasons.

[1slo5.0]

Originally Posted by Mr_Evil You hoped wrong. You dont know what your talking about. No they are not, All sensor readings are taken in by the ECU. You can put resistors in the signal line to change its frequency, which in turn could cause you ECU to adjustl. But a stock ECU will n0t vary much off of the base/stock fuel map no matter what sensors or injectors you have. I could go on to tell you how wrong you are, but i will stop there.

Please go on and on. I'm just starting to get excited.

[TENGRAM]

Originally Posted by Mr_Evil You hoped wrong. You dont know what your talking about. No they are not, All sensor readings are taken in by the ECU. You can put resistors in the signal line to change its frequency, which in turn could cause you ECU to adjustl. But a stock ECU will n0t vary much off of the base/stock fuel map no matter what sensors or injectors you have. I could go on to tell you how wrong you are, but i will stop there.

whether he is wrong or not (he's not) you need to learn to show respect. there are better ways to put things. in just the last week i've caught you on several occasions spewing misinformation. did i insult you for it? no i just corrected it. you should approach these threads as a way to share info and if necessary make corrections, politely.

for example, this little tidbit:

Originally Posted by Mr_Evil uhhh.... Drop your fuel pressure. You should be able to get it with in range. But I had a Cadillac that would go all screwy' on me with different sized injectors. Someone said it is because when the fuel ratio changes to much the car will go into limp mode (O2 sensors aka lambda sensor). But if your car wont go into limp mode, just drop your fuel pressure with an adjustable regulator. You should be able to get it where it is not to rich. But you will still be running the base/stock fuel map/curve, so you really need another ECU.

drop fuel pressure is not what he needs to do. dripping fuel injectors do not produce power. also, why would he get another ECU? several companies make tuners for ford's EEC that would do the job very well so why would he spend a fortune on an aftermarket ECU such as DFI? a dyno tuned chip would also work great. these methods are much more common than your aftermarket ECU idea because they're cheaper and they get the same results. and no, changing fuel pressure to any exent will not cause you to enter limp mode.


anyway it is common terminology to say a maf is calibrated for certain injectors. yes they may use resistors among other techniques to accomplish this but it is still a calibration of sorts. mafs calibrated for 24,30,etc injectors do have an effect on the ECMs calculations, and in most cases it gets things close enough. obviously the larger your injectors (even with a "larger inj" maf calibration) the further off the ECM calculations will be, but thats not to say "the ECU will not vary much off of the base fuel map". it doesn't vary "off" the base fuel map at all anyway, it varies within the fuel map, which actually allows for quite a bit of variation.

[Mr_Evil]

LOL, you just suggested a programmer over an ECU. OOOO' you may be able to get a whole preprogrammed 15hp out of that thing. Chips are decent, but for one that is reprogramable you will spend just as much for. And they still are not up to par to an ECU.

And dropping the fuel pressure a few psi, wont make them "dripping".

As for showing respect.? His lingo' started the jive...

Tengram, MAFS's are not calibrated to injectors. ECU's calibrate fuel maps for injectors, and calibrate those fuel maps off of stock MAFS signals. Nothing on the MAFS's end is adjusted in any way to suit injector types/sizes. PERIOD!

[Bill]

Originally Posted by Mr_Evil LOL, you just suggested a programmer over an ECU. OOOO' you may be able to get a whole preprogrammed 15hp out of that thing. Chips are decent, but for one that is reprogramable you will spend just as much for. And they still are not up to par to an ECU. And dropping the fuel pressure a few psi, wont make them "dripping". As for showing respect.? His lingo' started the jive... Tengram, MAFS's are not calibrated to injectors. ECU's calibrate fuel maps for injectors, and calibrate those fuel maps off of stock MAFS signals. Nothing on the MAFS's end is adjusted in any way to suit injector types/sizes. PERIOD!

interesting. where are you getting this info from. lol

[twinturbo]

I'm with TENGRAM. I'm not even going to start with this guy.

[1slo5.0]