i know this subject has been beaten to death, just cant find a solid answer, i need to know if petitt ecu will fit in my jdm, if not is there any info on wiring to convert?

 

What year is your car? If you car has the 8-bit ECU version, then you should be able to use a 93 non-Cali or 95 based Pettit ECU.

 

petitt ecu is nc31, my 93 jdm is n3a7 i believe, any probs with speedo?

 

There are so many different numbers for ECU's and I've never seen a fully compiled list. I've seen bits and pieces like in this thread:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-determine-type-ecu-164325/

If you have a 92-95 FD, then the US ECU should work. The main differences will be EGR and AWS. Most JDM cars did not have either of those. The 93 non-California ECU's did not have the electrical component for EGR and it was removed on all US 95's. The worse case is that it throws a check engine light for the EGR (AWS will throw a code, but not trigger the CEL), which if you car is JDM, it most likely won't have a CEL anyways.

 

ya read it, my petitt ecu is n3c1

 

ecu will work in the jspec from 92-95. A/c might not work for a Jspec 94. I had a pettit ecu in my 94 RHD Jspec and the A/C didn't work afterwords. He hauled *** though

 

anyway to get the ac to work?

 

will my air pump still operate?

 

Since your from Canada, you most likely have a 92 which means the petit ECU will work just fine and everything will function normally. However, you should consider a PowerFC in case you need it in the future and its just a good thing to have since the petit map is generic and runs rich to support most cars. I've seen then for sale used for $600 with commander, thats damn cheap and WORTH it.

thewird

 

just get a PFC and call it a day.

 

Yes

 

its a 93

 

Same thing.

thewird

 

ok so air pump will work, what about the air conditioning?

 

Everything will work just fine.

thewird

 

thanx ,just wanted to confirm everything before i used the ecu

 

can someone tell me how the stock ecu controlls boost, will i be fine with an ebc and what version for hookup? thanks in advance

 

as long as its an 8 bit it should work, im using kind of the opposit i have a j spec mines ecu in my us 93 and it works fine just throws an egr code

 

the petitt ecu has boost unlimited i wana run stock setting 10 psi, but how will ecu control the wastegate or does it? all info i read says just put a boost controller, i need more of an explanation on how the petitt works with boost control compared to stock ecu, im hoping petitt ecu will still control the wastegate solenoid, is this correct? but not the boost solenoid, hens the reason for only the boost control ?

 

ok that doesnt make much sense, what i need to know is how the petitt ecu controls prespool of secondary, if ebc is only controlling the boost, how does the ebc control the remainder of the sequential system

 

The Pettit ECU controls all the basic functions as the stock ECU, it has only been modified by Pettit to change the fuel and timing/ignition when more boost is added. It supposed to max out the injectors at 14 psi.
It still uses all the stock sensors and will give you all the trouble codes, it's just a souped up stock ECU.
You can call Pettit Racing directly and they can answer all these questions.

 

ive tried to contact them but they are so busy,i installed the ecu it runs way better at idle, havent taken it out yet, waiting for boost controller, i just dont know if the boost will go to what petitt set it for or will it stay at 10-8-10, but can handle more boost if i turned it up? thanx

 

Without a boost controller, the ECU will give you stock boost. With a boost controller you can change the boost. The sequential system is handled independently of wastegates (sort of). The ECU tells the second turbo to come on (simplified explanation) and the mechanical stuff takes care of the rest. Just make sure the person that installs it the EBC knows how to do it.

thewird

 

ok so stock boost with pettit unlimited ecu should be 10-8-10, i dont need a boost controller if i want to run stock psi?

 

Correct.

thewird