are you serious? a stock neon with just a mopar pcm wont make it to 7500 rpms? my neon hits 7500 hard in any gear with no problem and could keep goin if the computer would let it. but i do have lots of other things done to it maybe thats why. idk

 

when my old r/t was stock except for the mopar pcm i could hit the rev limiter in every gear without any issues

 

ha ha ha, I found out that the automatic DOHC pcm has a 6500 rpm rev limit. I held the gear in 1 till like 45 mph till the car lurched foward totally cutting out

 

Check the part #...
Q: I am looking for a Mopar PCM, how do I know if I am getting one?
A: Here are the part #s for the different PCMs...P5007033 PCM(95 Neon SOHC), P5007034 PCM(95 Neon DOHC), P5007035 PCM(96 Neon SOHC), P5007036 PCM(96 Neon DOHC), P5007037 PCM(97-99 Neon SOHC), P5007038 PCM(97-99 Neon DOHC)


You can put a magnum cam from the 02-05 ACR/RT neons in there.

 

The MOPAR performance PCM in my 1998 DOHC, MTX Neon as purchased from Koller Dodge in 2000 is part#P5007038 and with it came a installation instruction sheet stating that this PCM was a MOPAR remanufactured Single Board Engine Controller (SBEC III) and the PCM had the mandatory California Air Resources Board (CARB) certification number. As to rev limits, the SOHC were set to 6750 and the DOHC to 7250, speed limts were at 118 MPH for all except the ACR/R/T and export models and this was due to tire speed ratings (all per Erich Heuschele who was the Chrysler product engineer for small car platforms and also raced these cars).The revlimter for the MOPAR performace PCM is 7400 and speed limited to 148 MPH.

All of my data comes from either Grassroots motorsport or MOPAR Action magazines.

 

Stock DOHC makes HP up to about 7100 RPM, I saw a dyno test on a 1996 DOHC ACR and it peaked at 131 HP at just about 7100 RPM. The project engineer for neons in the '90s said that the worse combination on a Neon was an ATX DOHC because it shifted to soon to take advantage of the HP available.

 

I should have said this earlier. According to the Neon design engineer the weakest link in performance for the SOHC engine is the mismatching of the exhaust ports and exhaust header. A long tube header might help, but real power will not be forthcoming entil the exhaust ports are opened up.

 

The DOHC engine's peak HP was about 4000 RPM. I have never seen a dyno where the car made peak HP above 7000 RPM.

 

Here are the dyno results on a 1996 DOHC, MTX, ACR as done by MOPAR Action in I believe 1998:

5000 RPM=112.7
6000 RPM=124.1
6500 RPM=129.3
7000 RPM=131.2

I have the entire road test/dyno comparisons they ran on the BASE, MOPAR Performance, JET, and AF/X to include 1/4 mile times, spark advance, and speed and RPM limits.

 

This is the only stock SOHC vs DOHC dyno I have ever seen. The DOHC peaked about 6250 RPM and the SOHC peaks around 5750 RPM.

If you have another dyno that shows different, please post it up. I would love to see it.