1985 Mustang SVO modifications for performance - Ford Mustang Forum
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post #1 of 28 (permalink) Old 11-14-2009 Thread Starter
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Question 1985 Mustang SVO modifications for performance

Hi,

A buddy of mine has a low mileage (55,000) 85 SVO which he would like to increase the 175 hp rating on.

I know more about the 5.0's and 4.6's. I did once have an 84 GT Turbo, but that was a long time ago.

What is a typical mod list for these cars which can be done safely to the engine?

I know the SVO changed to dual exhuast in 85.5 and the turbos went water cooled and with a better A/R ratio.

What "Bolt ons" can be done to his car to greatly improve the performance to 85.5 to 86 model year specs and beyond.

I will see the car in an hour, but suspect it is bone stock.

Thanks in advance for the help.
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post #2 of 28 (permalink) Old 11-14-2009
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you can get any 85.5-86 svo ecu or an 88 LA3 TC ecu don't remember if you have to rewire anything or not.
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Quote:
Originally Posted by 93stangfutr5.0 View Post
you can get any 85.5-86 svo ecu or an 88 LA3 TC ecu don't remember if you have to rewire anything or not.
Just saw the car, it looks like it may have the 88 T/C engine and the computer is an EEC-IV with TEC and some other writing on it. PJ PJ or something... Also, the turbo is water and oil cooled and the I/C cooler looks like the Turbo coupe type.
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post #4 of 28 (permalink) Old 11-14-2009
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LA-3 install in svo.
http://www.forced4.com/la3swap.html

1989 Mustang 2.3 turbo, rebuilt SVO motor, 88 computer,vam upgrade, adjustable boost control, intercooler, c-4 trans, 7.5 345 turbocoupe rearend, motorsport driveshaft, Black interior.


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post #5 of 28 (permalink) Old 11-14-2009 Thread Starter
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The computer didn't have a chip in it, but had obviously been removed and the wiring looked like it had been moved also. What does the SVO computer have on it for #'s or codes. LA-3 sounds familiar to me but I will have to ask him what the codes on the ECU were. I read them off and he wrote them down.
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post #6 of 28 (permalink) Old 11-14-2009
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I'm not an expert on these cars, but seems you could up the boost and put a bigger intercooler on them...if you have the budget, rebuild the motor with forged internals and then really turn up the boost! I guess a bigger turbo might be in order at that point and standard hot rodding techniques should work...porting, polishing, lighten the car, work on the suspension etc...I do recall Ford motorsports used to offer a 500hp 4 banger back in the day...strange, history is repeating itself..these EVO guys think they are unique

Last edited by 2Manystangs; 11-14-2009 at 06:38 PM. Reason: edit
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post #7 of 28 (permalink) Old 11-14-2009
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Increase the boost a couple of LBS. The early svo motors were a little different. The 205 HP jobs had brown tops (35 lbs) They also had a faster spool time and a slightly different intake setup. Hay welder DUDE. I have a question about pin 49 on the LA3. All the guys on TF say it belongs on the turbo bell. And ford did put it there. When i do a conversion i jump it to signal return. They jumped all over me for this statement and hunted me down like a dog. What is your thought on this. Bob Morrs web site claims the same thing that i do. Any info would be appreciated TOM

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post #8 of 28 (permalink) Old 11-14-2009 Thread Starter
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I forgot to mention a couple of things I noticed...

It had the 42# Green top injectors
The intercooler looked like one from a Turbo Coupe
The valve cover looked like one from a Turbo Coupe
The timing belt cover and pretty much the rest of the engine look like the 88 Turbo Coupe engine
The turbo appears to be a T3 which is oil and water cooled.
The computer had PJ on the side and it had obviously been removed, the wiring harness wires were no longer wrapped tightly and the computer wasn't bolted in.
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post #9 of 28 (permalink) Old 11-15-2009
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Quote:
Originally Posted by 2Manystangs View Post
I'm not an expert on these cars...if you have the budget, rebuild the motor with forged internals and then really turn up the boost!
Obviously you aren't an expert on these cars They already have forged internals.

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A PJ is the stock computer for an 85. A PE from the 85.5 and 86 will go right in without repinning. The only difference in the performance from one year of SVO to the other is the EEC and 35# injectors. Nothing else. The turbos have the same compressor, so no more power there. The inline intake will provide more torque than the square intake. It has also been found that gutting an intake impedes performance. Port and polich is best.

42# injectors are doing that engine more bad than good. The EEC cannot provide the proper pulse rate for those things, so it will run worse. Kinda like putting an 850 Holley on a straight 6.

the timing belt cover is no different than any other 2.3 of the era.

Look up Boport and get one of his cams and headwork done. The head is the secret to these cars.

FMS never had a 500 hp anything much less a 4 banger. There were some factory racing engines cranking that out, but nothing offered to the public

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Quote:
Originally Posted by NavySVO View Post
A PJ is the stock computer for an 85. A PE from the 85.5 and 86 will go right in without repinning. The only difference in the performance from one year of SVO to the other is the EEC and 35# injectors. Nothing else. The turbos have the same compressor, so no more power there. The inline intake will provide more torque than the square intake. It has also been found that gutting an intake impedes performance. Port and polich is best.

42# injectors are doing that engine more bad than good. The EEC cannot provide the proper pulse rate for those things, so it will run worse. Kinda like putting an 850 Holley on a straight 6.

the timing belt cover is no different than any other 2.3 of the era.

Look up Boport and get one of his cams and headwork done. The head is the secret to these cars.

FMS never had a 500 hp anything much less a 4 banger. There were some factory racing engines cranking that out, but nothing offered to the public
What color are the injectors supposed to be? They looked light green to me but were dirty. I thought they were supposed to be the red top 30# injectors. The car runs smoothly and idles. It does smoke at startup, but I forget which color and it immediately cleared up.
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Tom Renzo. I thought that was you over there. I go by mgman75 over there also. As far as the 49 wire. I am not a electronics tuning person by no means. I do know if not hooked up at all, fuel mileage will suffer. I got mine on inlet to turbo. I also read wire has to be same length as the wire reading the o2 signal. I have read somewhere use a later model [can't remember what one] 4 wire sensor and move 49 wire to the new o2 sensor. Maurice

1989 Mustang 2.3 turbo, rebuilt SVO motor, 88 computer,vam upgrade, adjustable boost control, intercooler, c-4 trans, 7.5 345 turbocoupe rearend, motorsport driveshaft, Black interior.


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30# injectors are light green

35# injectors are brown

42# injectors are a neon-ish light green. Kind of like the Mopar color Sublime that went on late 60s early 70's cars
Sublime Green Dodge Challenger T/A

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Quote:
Originally Posted by NavySVO View Post
30# injectors are light green

35# injectors are brown

42# injectors are a neon-ish light green. Kind of like the Mopar color Sublime that went on late 60s early 70's cars
Sublime Green Dodge Challenger T/A


It has 30# injectors then. I have a set of 30# injectors for my 4.6L Saleen kit are red. I wish they stamped the rating instead of using the color, since that apparrently changes with age.
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Quote:
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It has 30# injectors then. I have a set of 30# injectors for my 4.6L Saleen kit are red. I wish they stamped the rating instead of using the color, since that apparrently changes with age.
the impedence is the factor to prevent the EEC from getting fried. Ensdure any injectors used ar LOW impedence.

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Kurt 85 SVO
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