1991 Mustang 2.3l Turbo

[KJP]

Well I finally got around to putting the turbo on the 1991 coupe.

2.3l 8 plug engine with the stock mass air computer. The turbo is from a 1986 SVO rebuilt. I listed it here but since no one would pay the price I decided to go ahead and install it.

I had issues with the fuel delivery. The 1991 Mustang 2.3l has 17 lb/hr injectors. It ran out of injector at around 4000 rpm.

I installed 24 lb injectors and built a circuit to allow me to re-calibrate the factory Mass Air meter to fool the computer so that the 24 lb/hr injectors would work.

Well it works pretty good now. I have the boost real low at 5lbs and the car really gained HP from stock. Eventually I will turn the boost up a little and se ho it works. I will never run it really high on this stock engine.

I plan on building a new bottom end with turbo pistons for a little less compression. I will also be tuning the computer with some kind of chip. I plan on going to 43lb/hr injectors and then turning the boost up to maybe 15-18 lbs and really making some power.

For now it runs just fine and also makes less noise than before.

Here is a picture.

http://www.tennesspeed.net/gallery/data/500/1991turbo.jpg


Car has 2.5 inch down pipe and 2.5 inch high flow catalytic converter with 2.5 inch hooker aero-chamber muffler and 2.5 inch tail pipe.

The inter cooler is EBAY air to water and actually works good. I have a lightning water pump and the inter cooler radiator from a 2003 cobra. The surge tank also came from the 2003 cobra.

They said on turbofords that the 1991 computer wouldn't work and that I should use the older turbo computer. It actually drives good and gets better gas mileage than I got with the PK1 and VAM. Drive ability is also better than the PK1.

Kevin

[66sprint6]

Awesome!!! I ditched the stupid VAM on my 84 SVO and went with mass air, and if I woulda kept the car I woulda def. ditched the stock computer, it sucked!!! Good luck with the project!
Matt

[onebad7up]

They said on turbofords that the 1991 computer wouldn't work and that I should use the older turbo computer. It actually drives good and gets better gas mileage than I got with the PK1 and VAM. Drive ability is also better than the PK1.

Kevin

That may be true...but you are not driving a 2.3t car. The LA3 computer paired up with a set of 35# injectors works great.

Lets show that computer 18# of boost, and see what happens.

TF knows these cars inside and out. A 91' computer is a bad choice if you ever want a fast and reliable ride.

[KJP]

If I chip the computer and set the timing up correctly I will have no issues. Someday i will run 18lbs of boos and make lots of power. I may use an a9l and chip so that I can run sequential. Since micro controllers an microprocessor programming are my profession I will solve the issues and ultimately I will win. The drive ability now is pretty good. I need to install the blow off valve. That will help with the driveability since it will prevent some richness caused by the slow blow off of boost after the throttle is released.


If I had an LA3 and a chip for it I would try tuning it. At this time my compression is high enough that I would be having part throttle off boost detonation issues.

I will eventually build the Turbo coupe engine with turbo pistons then the LA3 would be easier to use.

For now I will be happy with 5-7lbs of boost and good off boost drive ability.

[50stangpi]

:up:

[onebad7up]

The LA3 maps are hard to beat at the power levels you are trying to see. They are cheap and plug n play.

But like you said, there are other ways of accomplishing the same goal.

[KJP]

Well as long as I have the higher compression 8 plug engine in the car I will stick with the stock computer and 5-7 lbs of boost. When I get the lower compression turbo engine built the LA3 would become a good choice. I would need to chip it and keep the MASS air sensor though.

Kevin

[onebad7up]

Well I have a lot of parts depending on the route you want to take.