i am considering getting an upgraded stock ECU, but i dont really know much about them. i dont plan on doing extensive mods; if i did i'd get a haltech e8 or atleast a PFC, but i dont plan on going that far. i'm going to keep the stock twins, stock fuel, possibly even the stock IC. right now the stock ECU is fine for me; i did the non-sequential mod and run about 9psi. this feels fine (and more importantly hasnt blown up) but did creep up and hit fuel cut once.

i really just want to run about 12-13psi and not do any more modding to the FD unless its an intercooler and maybe a fuel pump.

now my question is: whats the difference between the remapped ECU's? so far i know of pettit unlimited, RE-Amemiya, and M2. all i know about these ECU's is people like them and people have run low 12's or even 11's on them, so what else do i need to know before buying one? if it matters, i'll be looking for a used one; if i had 600 bucks for a new one of these ecu's i'd probably kick a little more cash out and just buy a PFC...

 

for $600 remapped ECU?

why not just buy the PFC with commander.... FDnewbie has a groupbuy for buying both... i think its like $790

much easier to tune and read your temps and other vitals

 

.

 

my bad.

 

after finding some info on the pettit unlimited ECU (which seems great) i'm basically just wondering the differences between it and the RE-A and M2 ECU's

 

The Pettit and M2 are pretty similar. I ran the M2 for a while before I got a PFC and it worked well for me. I believe both of those are mapped safely enough so that you can run full exhaust, intake and upgraded twins. I was running the M2 Stage III with Knightsports twins, 3" exhaust w/ high flow cat, intercooler, intake and stock fuel (w/ a Supra pump) at around 12 psi. Car ran great, and got good gas mileage when I kept my foot out of it.

I've heard of people making 300-320rwhp on these ECUs, and the way they're mapped they'll be able to deal with adding mods on one at a time (as long as you don't exceed the boundaries of the stock fuel system), so they'd definitely be a good starting point.

 

if you plan on turning up the boost over stock levels, make sure you get the fuel upgrades. with a pettit smic and pettit midpipe, my car's running stock sequentials at 14 psi fine with just 1300cc secondaries and a cosmo fuel pump w/ PFC. IMO, just go with the PFC. its by far my favorite mod and its a good investment. its also fun to play around with the commander, you can use it to monitor everything including your water temp. and save 100 from buying the gauge. (thats what i did and you get a more accurate reading from the pfc than reading a gauge)

with sequentials, 14-14.5 is about the highest you can boost with the right upgrades, but with your non-sequential twins, you can boost a bit higher, but MAKE SURE you do the upgrades. if you do not plan on upgrading the IC, id say just keep the boost at stock levels.

hope this helps.

 

The differences are the MAP used. However, no one knows what the programming is on these chips to give you a straight answer as to the exact differences. M2 has always been seen as the most conservative rechip (after the older GForce rechip ECU).

RE-A does custom programming. So, if you were to find one of these used, you'd have no idea what the MAP was created for which IMO is not a good idea. Pettit uses one map for all their ECU's, but is been thought of as a more aggressive MAP. The difference with their ECU's is whether fuel cut is at 14.7 PSI or higher (Limited or Unlimited). M2 has 3 stages for their ECU's, however they never recommended running a midpipe with any of their stages. IMO, it was more because they didn't want people saying their ECU blew up their motor when it would most likely come from another problem such as boost creep.

 

I had a pettit unlimited on my last FD, and loved it. It was simple, and worked like a champ. I would highly suggest one if you dont plan on extensivly modfiying the car. Good luck with what ever you do.

 

interesting. good info, guys. so it appears that i should probably go with a pettit ECU. what are the differences between the limited and unlimited/ only the boost level fuel cut?

also, my mods are as follows:
full non-sequential mod
doublethrottle plates removed
custom downpipe, magnaflow hiflow cat
custom catback
apexi intakes
pulley kit with airpump delete
stock IC

now my plan is to use a MBC and run 12psi with the pettit ECU, what power level would that put me at?

 

You don't need any upgrades to your fuel system (with an M2/Pettit ecu) unless you are planning on running over 300 rwhp.

 

Im selling a 93 Pettit Unlimited ECU...and i live about 45 minutes from ya. Check your pm's

 

Yes. But it's kind of redundant IMO, because the "limited" chip activates fuel cut at 1 bar (14.7 psi), and basically at that point, you should be running bigger injectors/fuel pump/etc. anyway.
I'd suggest getting an aftermarket IC soon, as you'll be working your turbos pretty hard to run through the pressure drop of the stock IC.

 

Yea like Kento said, I would not recommend running any boost above stock with the stock ic. It will not be able to keep up. Get an upgraded smic.

When I had the pettit ecu I was running:
Fresh streetported rebuild
Apexi intakes
PFS SMIC
HKS dp
High flow cat
RB dual cb
and some other ignition stuff and what not.

Point is, you can take these ecu's pretty far. My last FD was pretty quick. Good luck with your decesion.

 

where exactly are you located? i'm back and forth between louisville and bowling green for school.

 

Up near Northern Ky. 5 minutes from Cincinnati.

 

Kento, 1 bar is 14.5 psi, 14.7 is the stoich AFR. I know I'm nitpicking, but just wanted to throw that out there b/c I often see that mistake made

 

That's what I get for running through my conversion charts too quickly...

 

I screwed up the gallon-to-ounce conversion when talking about premixing not too long ago, so don't feel too bad

 

i have a m2 stage 3 for sale if thats the route you want to go

 

^lol

...think he's already bought one...
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-identify-m2-ecu-613536/

 

actually i have not bought one. i have a little bit more money now and i think i'm going to go with a used PFC/commander