95 MUSTANG TUNE HELP

elio3848

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Jan 5, 2020
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I have a 1995 mustang gt automatic with a built engine, it has a 331 stroker kit, stage 2 trick flow top end kit that comes with the trick flow stage 2 camshaft and full exhaust with x pipe high flow mufflers and around 10.5/1 compression. I just bought this car and the past owner gave me 2 SCT tuning chips saying that all I need to do is take my car to a dyno shop and get it tuned. Well, the car has been at a "professional dyno tuning shop" for the past week and I recently received an email saying he can't get the car to run leaner he said the car is too rich and doesn't know why.

Any advice?!?!?!?!?
 
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stanglx2002

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What size injectors?
Is the MAF calibrated fro the above injectors size?
 

96pushrod

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May 15, 2018
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Sounds like you need a new tuner.
You could get a quarterhorse setup and learn tuning yourself, or step up and go with a megasquirt based setup. I’d choose option 2 as there are more people versed in tunerstudios than binary editor/tuner pro
 
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elio3848

New Member
Jan 5, 2020
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Rochester, MN
Sounds like you need a new tuner.
You could get a quarterhorse setup and learn tuning yourself, or step up and go with a megasquirt based setup. I’d choose option 2 as there are more people versed in tunerstudios than binary editor/tuner pro

supposedly the tuner told me that the sct chip he flashed is already set up good and the tune on the computer is compatible with the build but there is something wrong with the wiring harness or the computer from the factory itself is bad
 

hrspwrjunkie

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Dec 15, 2004
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Well, not to knock the person trying to figure out your issue, but have you considered finding someone who knows EEC-IV Mustangs?

Whenever you take a car that far, part of tuning is going to involve re-engineering the entire system to function cohesively, not just adjusting parameters in the computer. You may need someone more familiar with modding 5.0s.
 

elio3848

New Member
Jan 5, 2020
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Rochester, MN
Well, not to knock the person trying to figure out your issue, but have you considered finding someone who knows EEC-IV Mustangs?

Whenever you take a car that far, part of tuning is going to involve re-engineering the entire system to function cohesively, not just adjusting parameters in the computer. You may need someone more familiar with modding 5.0s.
what would need to be changed entirely?
 

96pushrod

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May 15, 2018
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HiTech Motors out of Elk River MN
I looked these guys up, their track record for tuning isn’t good, especially if you get into fb reviews.

If maf and injectors are functioning properly, a half competent tuner should be able to dial in fuel - especially on a dyno. You’re better off getting a remote tune done over Dealing with somebody who doesn’t know what they’re doing.
What did he say your a/f was at?
 

elio3848

New Member
Jan 5, 2020
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Rochester, MN
I looked these guys up, their track record for tuning isn’t good, especially if you get into fb reviews.

If maf and injectors are functioning properly, a half competent tuner should be able to dial in fuel - especially on a dyno. You’re better off getting a remote tune done over Dealing with somebody who doesn’t know what they’re doing.
What did he say your a/f was at?
at idle i was told 10.8/1 after he "commanded" 25/1 in the tune because the car was running so rich
 
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96pushrod

Advanced Member
May 15, 2018
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Savannah
at idle i was told 10.8/1 after he "commanded" 25/1 in the tune because the car was running so rich
If he’s using commanded fuel to dial in Actual fuel then he is a terrible tuner.
Get your money back and hit up Willie at dirtydirtyracing. He does remote tuning.
 

hrspwrjunkie

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Dec 15, 2004
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what would need to be changed entirely?
Terribly sorry for the delay in response. I didn't know you had replied.

That's a complicated question. As Mustang5L5 said, we need more info, but trying to tune over a forum really isn't ideal. Finding someone who can go through your system to make sure it's solid before tuning is critical. As an example, making sure all the right components are there and functioning properly before getting started. Then making sure the appropriate computer control components have been replaced such as MAF, injectors, and fuel pressure regulator. Both the condition of the base system and the compatibility of the modified components can mess up the ability to tune the computer. Then the tuning begins. However, all of that assumes that the components in the engine are really what you were told were in there, are all installed correctly (such as the cam being dialed in right) and complimentary — although, if they really are all TFS Stage 2 parts they should be.

If your mechanical combination is everything you've shared, it doesn't sound like anything too terribly wild. The compression is a bit high, but as long as it doesn't detonate, it shouldn't matter. In fact, from what I know, it should run with just the right matched MAF and injectors — it would probably benefit from being tuned in correctly, though — but I don't have a specific MAF/injector combo to recommend. I would find someone who can work with you to dial in your combo from mechanicals, to fuel and ignition system, to computer tune.

Modifying any car really is in the realm of engineering, not auto repair, which means a need to approach it from a different mindset than a parts replacement mentality, so having someone who can do that is more critical than any specific parts recommendation — unless someone has a completely engineered system that works.

Were I in your shoes, I'd be looking for tuners with excellent reputations who have specific expertise with building and tuning naturally aspirated EEC-IV 5.0s — '94-'95 experience is probably helpful if not critical, as well.