Want to increase performance in my TIII

[uranus69]

Hey Group. I have a 91' Spirit R/T. I have an upgraded ND computer that I got from Neil Emero years ago. So I'm running @15psi with the +20% mopar performance injectors. I now have a custom 2.5 inch exhaust from the engine back with a glass pack muffler. What would be something that I could do to get some more out of it? Alcohol Injection? Nitrous? I dont want to do anything too crazy or blow the engine. Any thoughts? Thanks in advance.
Frank

[MNmopar]

If you're concerned about reliability, the first thing you should do is button up a couple of things.

- modified valve spring retainers to ease a bit of tension
- "jackson idler mod" for the timing belt "slap"

These two mods have shown to greatly reduce timing belt and intermediate shaft issues inherent in stock t3 cars.

I also would recommend the "lengel" rebuildable timing belt tensioner and idler because chances are that yours are getting sketchy at this age, and lengel's are totally rebuildable and the last ones you'll ever need.

Honestly, those are the first couple of things I've done to my rt's and then go from there. Others will jump in with other ideas, but do some searches on those two topics and go from there.

-oh, and make sure the o2 sensor hasn't fallen down and is laying on the exhaust back there ready to melt. That seems to happen a lot on t3 cars too.

[Turbo224]

Assuming everything is running correctly, I would suggest upgrading to a front mount intercooler.

[Lotashelbys]

Quote:

Originally Posted by MNmopar If you're concerned about reliability, the first thing you should do is button up a couple of things. - modified valve spring retainers to ease a bit of tension - "jackson idler mod" for the timing belt "slap" These two mods have shown to greatly reduce timing belt and intermediate shaft issues inherent in stock t3 cars. I also would recommend the "lengel" rebuildable timing belt tensioner and idler because chances are that yours are getting sketchy at this age, and lengel's are totally rebuildable and the last ones you'll ever need. Honestly, those are the first couple of things I've done to my rt's and then go from there. Others will jump in with other ideas, but do some searches on those two topics and go from there. -oh, and make sure the o2 sensor hasn't fallen down and is laying on the exhaust back there ready to melt. That seems to happen a lot on t3 cars too.

Definately a few things I would look into before modding the car too much.


I would also look into welding the deck side oil hole on the head if it never was done. Common problem on TIIIs causing the head gasket leaks is that hole.

I would also check the cams and rockers for an lobe wear or roller wear. If all these things are done or look good then I would start the modifications.

The things that will make the biggest difference is upgrading to a larger turbo and intercooler like Tyler said. Those are the two biggest bottlenecks on the TIII.

[440dart]

I had a simular setup as yours long time ago biggest thing that i felt that helped performance was a good intercooler and i just used a cheap jdm intercooler off ebay. Not only did it help performance it help alot with power consistancy you probley already noticed that at night when it cools off it feels like you gained 30HP