what ecu?
 

is the pettit ecu a good ecu to use ?

depends on what you want

mazdatrix has a pretty good ECU upgrade frome what i hear. kinda pricy tho.

93 13k on fresh rebuild

mods:

m2 intake
DP
Hi Flow Cat
3' Exhaust
knight sports upgraded twins

stock injectors
stock computer and boost

I want to have a reliable rx7 that makes good enough power to have fun but nothing to brag about.

I have my hands on a Pettit Unlimited Ecu. Was wondering if you guys knew if I could make 350 WHP with this ECU at least. with stock PSI.

and another thing the ecu came with " boost orifices" i think these go into the wastegate accutor.

are these any good? and what do they do ?

how much are you gettin the ecu for if it cost too much you should get the power fc instead

Dont forget re amemiya's ecu Redom, excists in wide range of settings...

I take it you have a pair of small beadlike things that have a tiny hole in them? If so, they are supposed to go in the line between the compressor elbow and the wastegate and precontrol actuators.

However, for 350 whp you'll need very solid boost control, and the stock wg/pc solenoids with restrictors are crap for that. Get an electronic or manual boost control.

The Pettit ECU isn't bad, but for 350hp I'd go PowerFC. You can do so much more with it for not a whole lot more money, plus you have no low speed/low power hesitation.

I don't know if you can get to 350 on knightsport twins and 12psi. (Stock is 10psi, but you can probably do 12psi with the Pettit). You should be able to get over 300whp. With a PFC you could add methanol injection and do some pretty impressive power without roasting your engine and turbos.

Dave

what do those orfices do ?

and when you say the wg/pc actuators are crap what do you mean ? and how do i get them replaced or upgraded?

screw the powerr fc. if you have that sort of money than spend it on a ex8

Yeah, go cheap on 13B and prepare to get a rebuild ;)

I've been running a Pettit Unlimited ecu for about a year ( including 3 track days) with no issues. I have just about the same mods as you, but my stock twins were upgraded by Pettit and no Knightsports, and I have a Blitz SMIC.

I've never dyno'd my car, but I CAN tell you that the Pettit keeps things running pretty rich, so I don't see 12psi being a problem.
I had to swap the ECU out for California smog purposes and after driving the car for a week or so with the stock, California ECU, my seat-of-the-pants dyno says I definitely gained something when I reinstalled the pettit.

My boost stays stock, 10-8-10, BTW :). I'm terrified of blowing it up...again.

When you added the Pettit Ecu did you add the Orifices as well ?

Im a little confused as to what they actually do.

The orifices work with the stock wastegate and precontrol solenoids as a boost controller. It is not adjustable or adaptive, so once you put a few bolt-ons on the car you will either overboost or get irregular boost patterns. Either way you get to remove the orifice pills and replumb the wastegate and precontrol actuators for a better boost control system. The wg/pc actuators themselves work just fine.