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would the pt cruiser turbo that air sierra used for his 2.4l fit on the 2.5l?

7K views 49 replies 20 participants last post by  Air Sierra 
#1 ·
would the turbo from a pt cruiser or srt4 work for the 2.5l? or is there another compatable turbo for the 2.5l that is pretty cheap?
thanks
 
#5 ·
This is a misconception. The "Iron Duke" was never used in Jeep vehicles. There was a 2.5 liter (151 CI) GM engine used in Jeeps from 1980-83 but it wasn't the Iron Duke and has no relation to the 2.5 liter (150 CI) engine in the TJ.

The 2.5 TJ engine is an AMC design that debuted in 1984 in the CJ.

2.5 GM used from 80-83 engine link: http://jeep.off-road.com/jeep/article/articleDetail.jsp?id=260198

2.5 AMC engine used from 85-03 link: http://jeep.off-road.com/jeep/article/articleDetail.jsp?id=261540
 
#6 ·
how could a turbo from a pt cruiser not work for a 2.5l motor? if the 2.5l only has one cam and the 2.4l has 2, would this not allow for the pt cruiser or a ptcruiser aftermarket turbo not work? it would require some modifications but it shouldnt require too much or am i wrong?
 
#9 ·
if you can weld, and have fabrication skills, you can definitely make a manifold that will work. the turbo is correctly sized.

thats the easy part. now the hard part is getting enough fuel and air to the mixture with correctly sized injectors, larger throttle body, custom computer programs, O2 sensor simulators, etc. It will ultimatly require dyno time to get the a/f mixture and timing right throughout the rpm range.

otherwise no, its not going to work. the manifold's bolt pattern is completely different between 2.4L and 2.5L - they're totally different engines developed at completely different times in history.
 
#10 ·
The turbo will fit, but every thing else in the system will not. Turbos and superchargers can be pretty universal, it's the rest of the system that is taylor made to fit the different engines/cars, intake mainifolds for superchargers(roots and screww type) and exhuast manifolds for turbos. Centrifical superchargers are the only forced induction that doesn't require a custom intake or exhaust, but like the rest, still require modification to the fuel system, comuter, and timing.
 
#15 ·
What people have been trying to say, which evidently you didn't catch is this.

The turbo is the correct size as in CFM air flow.

The turbo can physically be put onto your engine, someone will have to custom make you an exhaust manifold for it, that costs money probably several hundred dollars at least.

However, with out custom computer programming, fuel system (fuel injectors, fuel pumps, and fuel lines), and R&D time it will BLOW UP YOUR ENGINE. This part of the work would cost you thousands of dollars for someone to spend there time developing software, and buying and installing all the fuel system components to keep it from BLOWING UP YOUR ENGINE.

The cheapest route to get this accomplished is to:

1. Find a turbo kit with fuel system and computer programming already developed for your application. (usually 5k$+ for most turbo kits I've ever seen)

2. Buy all the parts yourself, have a exhaust manifold custom made, and invest in something like Accel digital fuel injection that can be programmed via a laptop. Unless you have extreme knowledge in digital fuel injection systems, how they operate, and how they must be programmed, I would highly suggest some other route to take, which leads back to paying someone else an outrageous amount of money to do. (Several thousand dollars for this option, and difficult to do if you don't know what you are doing)

Both of which are not exactly cheap options.

Basically what I'm getting at is if you can't write a program for your own ECM, fabricate headers, and know exactly what you need to upgrade your fuel system, your going to pay an arm and a leg to get what you want accomplished.
 
#17 ·
i can see your thread is getting hyjacked rather quickly, so i'll try to keep it realtively short. the short answer is, the turbo hardware from the pt cruiser will not work with your enginer.

supplying the shop with the turbo from a PT cuiser and telling them to have at it is pointless. the 2.5L and 2.4L being completely different engines, there is nothing compatible about the pt cuiser setup and your current engine. it would be more cost effective to buy one of the few turbo kits available for the 2.5L. usually you can also buy a computer programmed from the company that sells the kits to install on your jeep that will tune it for the turbo. without the modified tuning, the turbo kit on your engine is pretty useless. the 2.5L doesn't have forged internals, and the compression ratio is quite a bit higher than is typically run on a forced induction motor, so getting the motor to run reliably without blowing up will require low boost and fine tuning.

alternatively, you could sell your jeep and get one that has a 2.4L in it. if you do that, then you can get the turbo from the pt cruiser and the intake and exhaust manifolds will bolt right up to your jeep. again, it lacks the reinforced internals and low compression ratio, so there is some tinkering involved, but there is a very good thread in here about a guy already doing the project with good results.
 
#21 ·
There is so much mis-information in this thread its not even funny. It won't fit, I've never heard of a 02 simulator. The only thing I can think of for this is that the stock computer is pulled for a standalone, because if you don't have a 02 sensor with the stock computer it will just throw a code. Now as far as a "simulator", maybe another 02 sensor hooked up to a wide band to properly tune the air/fuels.

A map sensor adjuster... A joke in the tuning world, these are basically the little boxes you see on ebay and the back of magazines that claim 10 hp gains for 20 bucks... Its basically a regulator that you wire into your map sensor and turn a screw to trick your computer into thinking its hotter or colder than it really is... Flaw though, its not accurate enough to make up for any significant changes on a N/A car, and OBD over time will re-adjust to what it thinks it is supposed to be. It also vary time to time with what the real temperature is. How do I know? A good friend and I once used one on his SRT-4, before he realized it was a bad idea. After that he ran a proper piggy back, to go with his 50-trim turbo.

I've built a 50 trim turbo SRT-4, done some work on a friends T-88 Supra, personally built my own T-70 powered RX-7, and am starting to help a buddy with a T-25 powered miata. Real world experience...

Subarukid is pretty on with what he is talking about, it might be possible to run with the stock injectors and pump... However, you never want to run them past their efficiency at 85%. Oh, and by borg wagner turbos I hope you meant Borg Warner....

This is for the OP... It would be cheaper, and more reliable in the long run for you to do a 4.0 swap or V-8 swap. If you are set on it, it is possible, but it is less tested. Shop work and fabricating can get pretty expensive. You could always look into selling your 2.5 for a 4.0.
 
#24 ·
I think everyone is pretty much partially wrong to being flat out stupid.

-On an NA Fuel-Injected motor, you will need some sort of engine management to tune the damn thing (no, a chip will not do it.) Who knows what kinda hell you put your poor motor through running it like that.

-You don't need an intercooler or anything special... that all comes with power-levels and your set-up.

-For someone with "real world experience" how the hell do you not know about o2 sims? They're a pretty common tool when you start gutting/eliminating cats on OBD I & II vehicles.

All in all. No, it won't just bolt up. But, yes it can be done. But, no it probably wouldn't be cost effective. But, yes it would be unique. But, no I wouldn't waste my time.

And there you have my opinion. And now on to your basic parts list:

-Turbo (Whatever size for your application, in this case probably a rather meager unit.)
-Custom exhaust manifold or adapter.
-Custom exhaust piping to at least the stock catalytic converter (after that, it's up to you.)
-Custom intake setup.
-Wastegate, oil lines, etc. etc.
-Upgraded fuel pump and injectors.
-Some way to control the AFR. (Piggyback, standalone, etc.)

I'm sure I might have missed some things.
 
#26 ·
-For someone with "real world experience" how the hell do you not know about o2 sims? They're a pretty common tool when you start gutting/eliminating cats on OBD I & II vehicles.
.
...

Supra... runs an AEM standalone
RX-7... pre-OBD II and runs a standalone
SRT-4, never ran one. Never had a problem...
 
#28 ·
Could he just pull motor and all from the PT cruiser? Then he would have the forged inners, exaust manifold and all that mumbo jumbo. I dont have a clue what Im talking about but does that make sense to someone that does? Could he use the computer from the PT cruiser as well?
 
#29 ·
I wouldn't really know how to answer that question. With the 2.4L models, I'm sure you could interchange most of the parts, however I believe that in a jeep, the motor is mounted traverse and in the PT it is mounted horizontally. Again, I'm not 100% sure.
 
#30 ·
Yeah its probably horizontal but if its the same 2.4 as a jeeps then I would think it would mount straight. Maybe need a different bell housing. Again I dont know. Were the hell is the OP? Are you pulling this from a junk yard or robbing your mother in law? Maybe you should get the whole motor while your at it.
 
#31 ·
Could take the engine block and some other misc pieces, I'm sure. But the whole thing wouldn't bolt up and you'd still need to fab up some stuff.

Plus, again. He has the 2.5L, so I'm not sure if that would be the same thing. :confused:
 
#33 · (Edited)
Dont normaly get involved in this stuff, but as I have experience with Dyna jet Dynos, I have to say that this is a really silly statement.

never needed to "dyno tune' mine is as it wasnt meant to run the 1/4 mile.
You don't need to be running a 1/4 mile race to get great benefit from using a dyno to tune your engine

Don't be a tool, use one!
 
#34 ·
Dont normaly get involved in this stuff, but as I have experience with Dyna jet Dynos, I have to say that this is a really silly statement.

You don't need to be running a 1/4 mile race to get great benefit from using a dyno to tune your engine

Don't be a tool, use one!
Exactly. :cheers2:

MPG, power, etc. everything relies on your tune.

That'd be like going to the bathroom and not whiping your ***, then saying, "Hey, I got pants covering anyways!"
 
#41 ·
The PT is a transverse engine. The exhaust manifold will bolt directly to a TJ, but the turbo will not fit, due to it hitting the firewall. Air Sierra had an adapter machined to flip the manifold upside down so the turbo mounts in the front. The turbo must be re pinned so it oils correctly. The stock ECU is good for about 12psi of boost. The stock injectors will handle 3-4psi quite nicely. Air Sierra has part #'s for bigger injectors to handle more boost. He has around 20k miles without any issues. My turbo build starts as soon as I finish installing my new plow on my Dodge. I have right around a grand invested in parts for this mod.
 
#42 ·
The PT is a transverse engine. The exhaust manifold will bolt directly to a TJ, but the turbo will not fit, due to it hitting the firewall. Air Sierra had an adapter machined to flip the manifold upside down so the turbo mounts in the front. The turbo must be re pinned so it oils correctly. The stock ECU is good for about 12psi of boost. The stock injectors will handle 3-4psi quite nicely. Air Sierra has part #'s for bigger injectors to handle more boost. He has around 20k miles without any issues. My turbo build starts as soon as I finish installing my new plow on my Dodge. I have right around a grand invested in parts for this mod.
At that boost pressure, you might as well be pissing into the wind. I wouldn't waste my time for a gain of maybe 30-40hp and a can of worms.
 
#43 ·
I would disagree that a mod that nets around 225hp and 245lb/ft of torque and over 20 mpg in a Jeep is "pissing in the wind" and a waste of time. However, things are supposed to be bigger in TX, so I guess 4 bangers are frowned upon. Maybe some research on this mod would change your impression, but maybe not.
 
#50 ·
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