Anyone running turbo 2.5L ?

Thanks again for the info Mud Dawg. I do plan on staying with the carb. I will try the weber carb when the rebuild is finished. This rebuild is going to take about three months because I want to research this and do it right the first time so I don't come across some big headaches. The small headaches are always going to come up.

Kim.
 
85xjwoody said:
Yes the 2.5 is a very durable engine but it cannot take alot of higher RPM for very long. I have put my 2.5 through alot of punishment also but after memorial weekend it sure doesn't sound the same and that is because of to much high rpm's. That is why I decided to go with the performance parts rebuild.

Kim.
Click to expand...
the nice thing about a properly setup turbo is that you can bring the boost on early and control how much boost you have all the way up. i you keep the RPMs lower it can take alot more boost than reving it.
 
I figured I would get in on this as import performance has been my specialty. FWIW the early model 300 ZXT"s(Z31) did not run a T3 turbo at all. In fact the 84-85 models ran a t-25 then in 86 they were switched to a t-28 water cooled. the second gen 300's(z32) ran a smaller version of the t-3 but with a different AR( trim). In a small motor setup like the 2.5L a T-28 would be ideal if you were loking for trail use. They spool up quickly and are most efficient under 40mph /3rd gear. In 4lo this would be an excellent candidate due to the quick spoolong nature of this particular turbo. In 4 hi or mud a larger turbo would be more suitable due mainly to the amount of wheel speed thats generally needed so a T3/T4 hybrid with a .58-.65 wheel would be more suited. Anything larger than a .65 would require the motor to be able to be spun well above 6000 rpm just to completely spool the turbo.

We have been contemplating different options now that the 84 is just about ready for the road and a turbo setup has been talked about. Several automakers have used blow through turbo setups on cars before with success or we could just swap in an SR20DET motor..........

As far as fuel management is concerned there are many many choices out there but the most economical would be a RRfpr and a boost timing retard setup. Otherwise i see a standalone in someone's future.

Sorry to go on and on just offering some knowledge.
 
verysoon.jpg


Sorry, I had to brag. I just bought this for my 240sx. Garrett T3/T04E, a bit off topic but I'll be just over 400hp.
 
I converted from the carb to the TBI injection along with a Purple cam and Clifford headers. It was a significant change. Instead of all of the hassle of turbo, how about putting a Paxton Blower on there. They are a pretty simple install.
 
I have also been wondering about the possibilities of using a turbocoupe engine. Plus if you got lucky, some that I have found on ebay also have an 8.8 rear-end.
 
Believe it or do not, AMC actually offered the 2.5 motor WITH a factory EFI/turbo set-up on the spirit car. We had one in my junkyard, and now we have a 1987 spirit with no drivetrain (Gee, I wonder what happened to it?) several months back, I had a neighbor give me an '87 MJ with a 2.5, papers and all. anyone wanna' place bets on what is happening to the MJ?
According to the Hollister Interchange Manual, the EFI/turbo was available from 1986 until 1990. If you go this way, make sure to grab the EFI comp. out of the car, because if not, GOOD LUCK trying to find it later. Oh, yeah, the intercooler from a t-bird, or same basic size motor is a good idea, AMC never used one.
 
ren said:
Believe it or do not, AMC actually offered the 2.5 motor WITH a factory EFI/turbo set-up on the spirit car. We had one in my junkyard, and now we have a 1987 spirit with no drivetrain (Gee, I wonder what happened to it?) several months back, I had a neighbor give me an '87 MJ with a 2.5, papers and all. anyone wanna' place bets on what is happening to the MJ?
According to the Hollister Interchange Manual, the EFI/turbo was available from 1986 until 1990. If you go this way, make sure to grab the EFI comp. out of the car, because if not, GOOD LUCK trying to find it later. Oh, yeah, the intercooler from a t-bird, or same basic size motor is a good idea, AMC never used one.
Click to expand...
Oh hell yeah! Keep us informed about this thing. It sounds kickass!
 
the turbo 2.5 that i grabbed (see above post) is going to the machine shop today. i pulled the pan off the bottom end, since the motor was locked up, and i found a couple of spun rod bearings. i think that the little monster is fixable, so keep posted, if you are interested in how this works out.
for the people that are going to ask, the EFI on this motor is TBI. i am going to try to "bump" some power from this thing, with a mild cam, cut to favor the intake side, and maybe some other goodies. anybody have any suggestions, without getting too silly?
 
Just to muddy the water even more, are you sure your AX5 will handle the torque? The reason AX15's are in the turbo diesel (Euro) Cherokees and 4 litres is because the AX5 won't handle the torque - I'd hate you to do all the engine work and then see your shiny new tranny go boom.
 
If you are asking me about the 2.5 turbo set-up that I am rebuilding right now, fear not, for the tranny is none other than a T-5 getting upgraded to "World Class" standards, meaning that the tranny will be able to handle upto around 450 lb/ft of torque. Boy would I love to see that little motor make THAT kind of power, and still be trail friendly.
 
Don't go crazy with the cam. Too much overlap will cause blowdown. Shame it's not a DOHC engine so you can play with the overlap. Get a set of roller rockers...Quadratec sells a set for pretty cheap...the stock pivots don't like a lot of spring pressure with out rapid wear. I had a set cryo'ed for my engine and so far they are holding up...but it's not a DD. Also get a set of good pushrods...I think I still have a set of Clifford Cro-mos that were too long for my engine (at the deck/quench height i used). I'll hook ya up if I still have 'em. they MAY work...depends on your actual geometry.

The whacked rods in the core motor are not a problem...4.0 rods are the same...Hesco sells prepped rods or you can send stockers off for mods...do not have the damaged rods "rebuilt". the standard "rebuild" process differs greatly from performance modification technique...ARP bolts for a 4.2 fit perfectly. Toss the stock timing chain set-up and use Mopar double row set for a 4.0....easy bolt in mod and much stronger.
 
Ahhh..this thread resurfaced.....Parts sources....Hesco (pricey, but most excellent), Mopar (timing chain/gear sets, valvetrain parts), Clifford (be careful), and Quadratec (roller rockers). MSD ignition, Redline Weber
 
thank you muddawg.what is the prob. with clifford(what should i watch for from them?).does anyone make a different intake or maybe a header?all the help and info is greatly appreciated......new to the jeep thing.
 
Speaking from personal experience, their customer service sux unless something has changed. Don't expect their sales guys to know what they are selling, or application.
 
I run the Clifford header but didn 't purchase it from Clifford so I can't say as to their service. Only that it was the only one available at the time unless I fabricated one. One problem has come up with it. If your engine mounts are worn the collector will contact the fwd drive line. Also, the O2 sensor is read only from 1 cylinder. The only other performance part was the cam from Mopar Performance. I did however swap in the '86 TBI which greatly helped (not a difficult swap btw) but as Muddog says it still doesn't breathe well especially above 3500 rpm. I would like to try the roller rockers next. Of course what it really needs is a crank!
 
Google for "Turbocharged Jeep". This guy made his own system. He uses an adjustable MAP sensor for fuel control and a manual boost controler. Survivability is my only question. As far as your PCM seeing boost, it probably won't. I have checked around on some import sites and have been told that you can use a boost timing master (MSDpBTM) that retards timing as manifold pressure increases and a FMU (fuel management unit) to increase the amount of fuel. Another option is using a Megasquirt system as a stand alone type system. Another way would be to use an additional injector and contoller, I am unsure on how to make this work but it was a suggestion. Seems that moer people are considering this, there have been several post on Jeepforums.com about this also. A turbo from a Ford thunderbird or similar size (2.3l) would work.
 
ok.....another dumb question.where do i get a carb.adapter for my 2.5l?i have the carb i want its a nice weber but i need the adapter for the carb and linkages......anyone have any info?
 
You must log in or register to reply here.

Similar threads

2
1984 - 2001 specs
Replies
4
Views
2K
2001JeepXJNS
2
Back
Top