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Old January 7th, 2010, 06:30 PM   4 links from elsewhere to this Post. Click to view. #1
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95 gt tune questions


hey guys. so i am thinking about tuning now...but idk what to do with my 95 gt. i know the OBD2 system started in 96, so does that mean the only way i can tune is to have a chip installed? or is there another way. i currently have a cai, 75 mm throttle body and a MAF that is not installed yet, with an o/r x-pipe and magnaflow exhaust. is a tune even worth it or should i make more minor upgrades and then do a tune that would fit all the mods? and how much would a tune for my car cost?
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Old January 7th, 2010, 07:50 PM   #2
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No tune needed with bolt ons. You will be throwing money away for no gain in performance.

Make sure the car is in good running condition, run premium fuel, and advance the timing to 14* with the SPOUT connector out. Pay close attention to the car under a haevy load in high gear and at WOT. 94-95's are more prone to detonation then the earlier 5.0s, so it may not tolerate 14*. If it pings, drop it back a degree. It will run the best with 12 to 14* initial timing.


Pro M used to have a performance improvement harness that allowed you to run a Fox maf PCM. The fox PCM's have more aggressive timing and fuel curves and are not as prone to detonation. But the harness is hard to find now. I'm sure someone good with wiring diagrams could do it themselfs.
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Old January 7th, 2010, 07:58 PM   #3
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i would get a tune if you are changing the MAF. It will run better and will allow you to squeeze some extra power out of it. The 94-95 have a really shitty stock tune...ongoing argument is the 94-95 computer is garbage, after some debate its not the computer that sucks, its the program. they are really ticky and have to be adjusted perfectly or it will not run as it should....my 95 is no different.

just plan ahead and get as many mods that require a retune done at one time so you dont have to spend tons on retune charges. you will definately see more power out of it with a good tune.
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Old January 7th, 2010, 09:15 PM   #4
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ok...how hard is it to change the timing? im very inexperienced with cars so talk about timing and WOT mean very little to me. what is WOT? and i doubt i will be able to change the timing myself so how much would it cost to have somebody do that for me? and im considering NOS so should i consider that when i change my timing?
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Old January 7th, 2010, 09:42 PM   #5
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Originally Posted by joymij View Post
ok...how hard is it to change the timing? im very inexperienced with cars so talk about timing and WOT mean very little to me. what is WOT? and i doubt i will be able to change the timing myself so how much would it cost to have somebody do that for me? and im considering NOS so should i consider that when i change my timing?
WOT = Wide Open Throttle. Setting the timing is fairly simple with a timing light and a 1/2" (or 13mm) distributor wrench. Do a search and you should be able to find the process for setting the timing on a 5.0.

And yes, it is VERY important to take into consideration if you are going to run nitrous. You have to retard timing (from your max efficient timing setting) to run nitrous. How much you have to retard it depends on how big of a shot you plan on running.

It would be a good idea to run an ignition box with a timing retard. That way you can keep your full timing when N/A, and it automatically retards your timing when you spray.

Check out the Mallory 685 box. It has a 2 step, 12v activated timing retard (perfect for N2o), and a built in RPM window switch (I would not run N2o without one), and a couple more user friendly features that only takes seconds to adjust with a digital readout. I just put one in the LT1. I want to see what it will do with a little shot

IMO it's MUCH more user friendly then the MSD digital6

Mallory Ignition :: Product Details

Heres a link to the 685 from summit:Mallory Ignition 685 - Mallory HyFire VI Digital CD Ignitions - Suggested Parts - SummitRacing.com
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Old January 7th, 2010, 09:45 PM   #6
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Just as a side note.. the 95 was a guinea pig for the obd2 system. Your car may have it.
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Old January 7th, 2010, 10:46 PM   #7
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Originally Posted by HMUSN View Post
Just as a side note.. the 95 was a guinea pig for the obd2 system. Your car may have it.
would the plug in be below the dash like normal or somewhere else...im gonna look for it on my next day off...fiddle around and get more in touch with my car (second girlfriend) lol
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Old January 7th, 2010, 10:47 PM   #8
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Yea.. it would be below the drivers side dash if your car was indeed obd2.
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Old January 9th, 2010, 08:27 PM   #9
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whats the deal with changing 94-95 mustangs to the 89-93 computers. Some peolpe say dont do it because the 95 computer is faster and better then the earlier mustang computer. but i dont see how because i know if u put a cam in a 94-95 u will have tuning problems. i had a 91 mustang i put every up grade u could do to it and never had one problem running stock computer with no tune. i now have a 95 because i like the body stlye better. but every upgrade i do i have ide sruge problems and i know the car isnt running the best it could. i tuned many mustangs and i know everything i can set manurally is right
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Old January 10th, 2010, 07:27 AM   #10
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Originally Posted by 95project View Post
The 94-95 have a really shitty stock tune...ongoing argument is the 94-95 computer is garbage, after some debate its not the computer that sucks, its the program.
The stock programming isn't as bad as most people make out. I've done several mods on my '95 and I'm still running the stock tune without any issues. You can even run higher-flowing performance heads/intake as long as you install a bigger MAF and it's calibrated with the proper MAF transfer curve for the appropriate size injectors.
If you change the cam and the new cam specs deviate far from stock, the stock computer definitely needs reprogramming.
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Old January 10th, 2010, 11:15 AM   #11
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my car has the hook up under the dash but every one on here says its the obd1
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Old January 10th, 2010, 05:11 PM   #12
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Originally Posted by Bullitt95 View Post
The stock programming isn't as bad as most people make out. I've done several mods on my '95 and I'm still running the stock tune without any issues. You can even run higher-flowing performance heads/intake as long as you install a bigger MAF and it's calibrated with the proper MAF transfer curve for the appropriate size injectors.
If you change the cam and the new cam specs deviate far from stock, the stock computer definitely needs reprogramming.
You can GET AWAY with running the stock tune/PCM with better heads and supporting mods, but there is definately some power left on the table in a 94-95.

The same goes for a Fox 5.0, but less power is to be had with a tune. IMO, Until you go forced induction, or a a H/C/I set up, the gains in a paying for a dyno tune on a 5.0 really are not worth it.

Set the timing and the fuel pressure with an AFPR and you should be able to get the car performing vary well.
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Old January 10th, 2010, 10:44 PM   #13
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well i checked under the dash, definitely no obd2 port. im almost certain their are no 95 stangs with obd2. probably just an internet myth that grew once one guy said it on a forum. so how hard is it to adjust the timing and what will that change driving-wise?
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Old January 11th, 2010, 12:32 PM   #14
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Originally Posted by mpe331lx View Post
Set the timing and the fuel pressure with an AFPR and you should be able to get the car performing very well.
Exactly what I did. I still have the stock 19lb injectors but I've tweaked my AFPR and found the "sweet spot" at 45psi. I kept the timing at 10*BTDC though 'cause of the hot climate over here. The idle is rock steady at 650rpm in D and 800rpm in P.
My '95 does have the underdash connector but it's about as useful as tits on a bull. Like everyone else I use the connector in the engine bay for scanning codes.
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Old January 12th, 2010, 11:06 AM   #15
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where would i get an afpr, and is this something i can do myself with basically no knowledge of timing and fuel pressure?
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Old January 12th, 2010, 02:05 PM   #16
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I bought the BBK AFPR from Summit Racing and installed it myself in about 15 minutes. You'll definitely need a fuel pressure gauge to make the adjustments and I went for the Kirban unit that comes with an adapter that screws onto the Schrader valve.
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Old January 12th, 2010, 03:20 PM   #17
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so with my mods is there a "sweet spot" that i should expect? or are all cars different and i will just have to test it myself after each adjustment?
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Old January 13th, 2010, 08:10 AM   #18
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Originally Posted by joymij View Post
are all cars different and i will just have to test it myself after each adjustment?
Yes.
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Old January 14th, 2010, 12:56 PM   #19
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and im guessing it is rather easy to adjust the afpr?
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Old January 22nd, 2010, 05:59 PM   #20
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when ever you get it tuned make sure the guy knows what he is doing. cause i have had mine tuned about 5 times and he can seem to get it right. it sucks.
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