Lets theorize.

INVUJerry · Post by **INVUJerry** » Sun Feb 11, 2007 6:38 pm

Take my NGC 2.0

Lets throw a PT 2.4 DOHC head on it. What should I do next?

Is it possible to repin an ecu, and use a map sensor from an srt-4 and make it run? I'm pretty sure its been done.

What do we do next?

OB · Post by OB » Sun Feb 11, 2007 7:18 pm

assuming the twin cam head actually bolts up to the 2.0 block, you'd probably have to go with MS or some other form of engine management to get it to run properly. modifying the stock ecu is a bit of a shot in the dark if you ask me, but computers and EMS arent my specialty (yet) so im not too sure on that one. as far as the map sensor, i dont see why you couldnt use it. Then again, wht not just use the sensor from the PT incase the SRT one is different? You'll be using the same head/ports/intake system as the pt anyway, right? that would make the most sense to me.

INVUJerry · Post by **INVUJerry** » Sun Feb 11, 2007 7:38 pm

Well, from what I understand, you can get a DOHC to bolt to a SOHC block, its been done alot. THe only downside is a loss in compression

Jelloman457 is currently running a 2.4 DOHC with a stock 2.0 SOHC ecu, but he is an 00-02, not an NGC. I'm pretty sure I could get it to run if I swapped the heads, and then used the PT's cam position sensor. I would be able to rev higher, but I don't know which ECU has the more aggressive timing, the 2.4 or the 2.0. I'm sure the 2.0 has the higher rev limit. If I could get ahold of an 03-04 r/t ECU and somehow bypass the SKIM module I'd be in even better shape.

This is all theory so far guys.

Also, think about this: Not sure if I would need bigger injectors (I would probably upgrade anyway) but if the NGC always goes to a 14.7/1 a/f ratio...it would automatically adjust right?

Cbussilver01es · Post by **Cbussilver01es** » Mon Feb 12, 2007 5:25 pm

See, I thought in order to get the heads to fit, you'd have to get parts from the 1.6L mexican neon. Bc Im runnin witha DOHC shortblock and ported SOHC. About the PCMs, I know that a sohc can run a 2.4 but can run lean at the higher rpms, Ive heard some ppl resolve the problem by runnning the magnum pcm. Its great theory tho, I guess the best way is by trial and error.

INVUJerry · Post by **INVUJerry** » Mon Feb 12, 2007 6:52 pm

do what? 1.6l mexican parts?

Are you messin with me?

If it were to run lean higher up I'd probably just run larger injectors. But if I'm getting to that point I'll just run a MS

Cbussilver01es · Post by **Cbussilver01es** » Mon Feb 12, 2007 7:56 pm

I was only sayin parts from the mexican bc I had thought about doin the same thing with my car (swapping the heads) But instead I ended up with the dohc bottom end with sohc head and ppl on the org told me in order for the DOHC head to fit I would have to have parts from the 1.6l since they were dohc's.... thats all

OB · Post by OB » Tue Feb 13, 2007 3:25 am

to say it simply, I think that a project like this is a waste of time and money. Let me start with this: a stock PT cruiser with the standard DOHC motor is rated at 150HP. Your neon makes appx 130.

After gathering the little information there is on this topic, collecting all the parts you need, putting in the time to change everything out, figuring out EMS for the setup, calcualting fuel and timing based on the new parameters, compensating for the compression issue, and generally getting the car to run, youre looking at what, maybe an extra 15-30 HP if youre lucky? is it worth the months of research and wrenching and the thousands of dollars? I guess there's always the bonus of having a rare frankenstein...

INVUJerry · Post by **INVUJerry** » Wed Feb 14, 2007 8:00 pm

I was just theorizing. I'm probably not going to go through with this since I have a 95 to toy with, but just an idea for anyone else with an NGC car that wants to go through with it, would be awesome. If I were to go through with doing a DOHC setup on my NGC car, I'd swap a 2.4 while I was at it, and run a MS.

c2k · Post by **c2k** » Wed Feb 14, 2007 10:38 pm

instead of using the sohc neon pcm. use the pt pcm 2.4L MTX ECU. Try that

slowass02R/T · Post by **slowass02R/T** » Thu Feb 15, 2007 7:20 am

Canuck_2k wrote:instead of using the sohc neon pcm. use the pt pcm 2.4L MTX ECU. Try that

Rev limit on a N/A PT 2.4 is lower than that of a Magnum ECM ... with a DOHC head you'd want to be able to rev up to 7000 like in a 1st gen. TO bad it's NGC or I'd say repin your harness to work with a 1st gen ECM or even better a Mopar PCM.

INVUJerry · Post by **INVUJerry** » Thu Feb 15, 2007 8:37 am

I heard that someone was able to repin an SRT-4 ecu, now, I know that the rev limit on them is pretty low too, but what if we could get ahold of say.....a stage 3 ecu? Where do they redline at?

slowass02R/T · Post by **slowass02R/T** » Sun Feb 18, 2007 11:03 am

invujerry wrote:I heard that someone was able to repin an SRT-4 ecu, now, I know that the rev limit on them is pretty low too, but what if we could get ahold of say.....a stage 3 ecu? Where do they redline at?

are you going to turbo the motor too? If so try and get ahold of a S3 ecu but they are big $$$ and not many places will sell just the ECU.

If not going turbo time to pony up the cash for a AF/X

Why are you wanting to change the map sensor?

INVUJerry · Post by **INVUJerry** » Sun Feb 25, 2007 5:56 pm

slowass02R/T wrote:are you going to turbo the motor too? If so try and get ahold of a S3 ecu but they are big $$$ and not many places will sell just the ECU.

If not going turbo time to pony up the cash for a AF/X

Why are you wanting to change the map sensor?

I'd love an AFX, but howell is gay, and dosen't have one for the 03-05's.

You have to change the map sensor to run an SRT ecu. If I were to do this though, I'd probably just go with a MS.

refect · Post by **refect** » Sun Feb 25, 2007 6:21 pm

invujerry, stage 3 revs to 6500 i believe

INVUJerry · Post by **INVUJerry** » Sun Feb 25, 2007 6:33 pm

Hmmm..probably not worth the time to do that. I'm basically looking for the advanced timing somewhere. If I could figure out how to run an 03-04 r/t PCM that would own.

epatchett82 · Post by **epatchett82** » Wed Feb 28, 2007 10:59 am

My '04 r/t will only rev to 6750. Yes, it is a little higher than the stage 3 but still not 7000.

refect · Post by **refect** » Wed Feb 28, 2007 11:16 am

yeh you might need some type of stand alone to get it to rev that high and have everything work properly if you were gonna do that setup.