is hitting fuel cut off bad for the car? i mean iv never hit it but i got a lil idea to keep that n if i get a midpipe n set a boost controller for like 9 psi so if it starts to creep id be some what safer.. or am i wrong? im just want to get ride of my cat n go get a midepipe not something like a high flow cat so any info would be good... n i know also porting the wastegate would help but im just getting some info before i touch the car with a midpipe

 

you might wanna swap out that stock ecu

 

Hitting fuel cut in any car is bad. Definately get an aftermarket ECU. Power FC, Microtech, Haltech, what have you.

Regardless, ive seen too many people lose their engines due to either fuel cut or just ecu's not able to compensate for the mods. Please don't gut/swap your cat without installing the proper supporting mods.

 

Yes fuel cut is bad. If on the stock ECU, the stocker may not compensate for the added air quick enough to stop a "Wide Open Throttle" run on a MP and pop goes the engine. My advice if a ECU upgrade is not in your budget get a midpipe and make a restrictor plate and sandwhich it between your Mid Pipe and Cat Back meet. Make the restrictor plates hole 2.25 inches in diameter and you are saved. I know because I run this setup with an Apexi AVC-R boost controller and I have no overboosting problems at all. I have a nice 10-9.5-10 Boost pattern with no spike. :-) I hope this helps out.

 

Fuel cut is there to save your engine. Mazda is not going to implement a feature which is going to directly trash the motor.

However, the problem comes in when the ECU cannot enact fuel cut in time. Such times are "boost spikes". The ECU is programmed to allow a little spike (i.e. Fuel cut doesn't come on immediately). Mazda didn't want the car slamming on fuel cut with every little thing. The problem is a BIG spike can happen in that short amount of time where fuel cut will not kick off. It's a damned if you do, damned if you don't situation.

 

Thanks for all this info now i know what im gonna do

 

I hit fuel cut dozens of times during racing, street driving etc. way back around 94-95 when very little was known about these cars. Never popped an engine. Same engine is still running for the buyer of that car.

I've hit fuel cut several times in my present FD (with PFC) with no ill effects.

It is probably NOT GOOD if you have a choice but, better than allowing out of control boost conditions to exist.

Albert