I just bought a '93 halfway thru modifications.
It has.. a Petitt TXT kit (downpipe, fullflow cat, pulleys), an M2 ecu set with a 14-10-14 boost pattern and Greddy Airink air intakes. The motor is a Rick's Rotary rebuild with 2mm seal and 5k on it. Solid, hot and cold start, idle right thru the rev range perfect, and I want to keep it that way.
The battery has been moved so there is room upfront. The car came with, uninstalled, a Greddy FMIC and a stock mount XS Power intercooler, and an M2 cold box that was removed for the Greddy intakes.
I live in a way hot part of California and plan on an immediate radiator upgrade and prefer to use a stock mount intercooler and reinstall the M2 cold box to get the air intake out of the engine compartment.
I would really appreciate any thoughts and which options/equipment that make sense of my cooling/intercooler options.
Also should I be worried that the 14-10-14 boost pattern is too high for reliability?
Thanks, Peter.

 

Based on my understanding of it, your boost pattern is probably not going to be the reason your car goes down. Are you experiencing any boost creep? Whenever you up the boost and/or mod the exhaust, I know that's one thing to watch out for. At least you have the tuned ECU.

You're on the right track: an upgraded stock mount with a better radiator is probably your best bet at this point, and the M2 box can't hurt either.

Hope this helps.

 

Thanks,
So.. even with the M2 ecu, which I had thought kept a tight control of the boost patterns, I should still look for boost creep?
How does the boost get away from the ecu's control?
Peter.

 

I'm not familiar enough with the M2 ECU, but the reason boost creep becomes a problem is that the stock wastegate is insufficient in expelling excess gas fast enough as backpressure drops. As far as I know, you can have a fully open stock wastegate and still see creep.

It's definitely something to think about. I assume you have a boost gauge installed already?

 

The 14-10-14 is way to high for stock fuel. M2 and Petitt thought it was ok back in the day but your injector duty cycle is probably around 95%+. Cut it down to 12-10-12 with a boost controller and you should be good.

In honesty I would probably leave it on 10-8-10 unless you are out for some spirited driving or racing.

 

It happens when the internal wastegate on our stock turbos cant keep up/flow enough air past the exhaust wheels and thru the exhaust. Causing the turbos to spool/flow more air into the intake path. If you are truly worried about this the only real fix is to pull the turbos and port the wastegate.

 

I agree the 14-10-14 is too high and I prefer reliability over a few extra hp and a blown motor.
So, what are my best options to doing a one-time resetting of the ecu to a 10-8-10 pattern? And what other settings should be changed at the same time, if any? I think it set to run rich right now to help hedge against detonation.
Interesting stuff, thanks, Peter.

 

Your ECU settings can be kept the same, and you can use it with lower boost. You should use a boost controller (manual or electronic) to control your boost because the stock boost control system doesn't respond well to mods.

Do you have a boost gauge? What boost do you see now? I wouldn't get a catback exhaust until you get your wastegate ported to prevent creeping.