whats up guys, justed wanted to know if i would be able to put in apexi gt exhaust, downpipe, and apexi intake with stock ecu will that mess things up. Also, if I could put atleast 2 of the 3 in with no problems, if all three at the same time would mean problems later for me.

 

This has been discussed to death and back again.

If you're on the stock ecu, keep the boost at 10 psi and you can run those mods just fine. With those components, you will likely need a manual or electronic boost controller to maintain 10 psi.

 

thanks man. i'm still a "newbe" to this rx-7 forum. i just apreciate all the people that help me out for such simple questions.

 

No problem, consider it your fee for me looking at your sig....

 

A little late, but here's a thread on someone using just about all the bolt-on's with the stock ECU:

https://www.rx7club.com/forum/showth...hreadid=213367

266rwhp is not bad. Doesn't sounds like much when you see dyno's of other FD's over 300rwhp, but considering a healthy stock FD will dyno around 220rehp or less, 266rwhp with the stock ECU is a damn nice increase.

 

A stock motor in good condition can handle a constant 12psi with stock ECU. Although the 10psi constant boost is a good sign as well. I run 17psi on Stock motor, so I cant go Full throttle atm or my motor will blow, I have decided to go with the PowerFC and Commander, also gone 850cc prims, and 1200 seconds. Should somewhere from 45-90HP with that upgrade, I hope to do it soon.

 

Umm...no. The stock ecu enacts fuel cut at 10.7 psi above 6000 rpm.

Statements like that don't lend you much credibility in giving ecu advice....

 

Explain how it is that Mine is boosting 13psi w/o fuel cut, It did fuel cut once though but it was much higher then 13 was around 15psi.

 

You have to be boosting continuously for over a second for the fuel-cut to enact. Maybe you're not boosting as high as you think you are. Hope that you're not, as you're headed for a blown engine. Amazing with the resources available to FD owners, and people still run their cars past the safety point....

 

Well, accoding to a ECU expert, there isent any type of fuel cut, the stock ecu will start to vent the extra boost yes, but it doesnt cut fuel as that would cause it to run lean

 

Maybe your "expert" should go out and actually drive a stock ecu FD that's boosting over 10 psi then......

Your expert doesn't know what the hell he is talking about. The stock ecu certainly doesn't vent the extra boost, if it did, you wouldn't be going over 10 psi, but you do. And it most certainly does have a fuel-cut. It's even in the owner's manual.....

BTW, please give the name of this "expert", so we can know to ignore them in the future....

 

Surprising that after all this community has learned we still have folks that don't understand how the stock ECU works.

Fuel cut is a function of boost and rpm, look it up in the manual. This can be changed with the aftermarket modified stock ECUs such as M2 or Pettit. You folks not experiencing fuel cut at the boost/rpm that rynberg mentioned either have a mod'd ECU, a boost cut defenser, or something else is not what is seems.

I was able to get 278 RWHP on the stock ecu with a catback, midpipe, and cai ... but that was at a boost level just below fuel cut.

 

Fuel cut is part of the stock ECU to keep the car from going beyond it's limitations. The designers had put some margin in there as well. We add bolt-ons and other stuff and push the stock ECU to the edge; thus, you have to add piggy backs, more fuel, and/or EMS.

The "venting" of the extra boost is done mechanically with the internal wastegate. You'll see more than 10psi since instantenous boost cannot be controlled, especially with the stock wastegate port (enlarging the port does help control the boost a bit). Hence, boost spike happens and a good spike will trash a stock-based turbo rotary engine.

Sustained boost gives the ECU time to react and cut fuel. Sounds like running above 10psi on stock platform leads to a short fun ride.

J