I have had my downpipe on with my intake and exhaust and have hit 15 psi but once you guys told me to back off i have...but i still hit a little over 10 sometimes because im tryin to not run it hard...i just dont get that when i had all this on i raced my freinds trans am and took my freind and dad for a ride and ran it pretty hard, then put the boost gauge on...and the engine is fine still and it still runs really good....from what you guys have been telling me , my engine should have blown already but its running damn good...

 

Better to be safe than sorry. People have successfully run higher than stock boost on the stock ECU, but there are few cases of it, and most don't last very long. You're walking on very thin ice doing that. If you can prove all of us wrong, more power to you, but it's not worth the risk.

 

Yeah ill probably try and baby it till i get my boost controller & PFC. thanks

 

Just because you overboost doesn't automatically mean your engine is blow. Overboosting increases the chance of detonation as the A/F ratio is not safe. Whether or not detonation actually occurs is basically the luck of the draw when you are running boost levels you aren't tuned for (and the stock ECU isn't tune for high boost levels).

 

if you have the main cat...the backpressure is saving you for the time being...time bomb.

 

so is my engine getting damaged or will it be ok still if i dont run the hell out of it and dont go past 10 psi? and does high psi over stock settings make the engine blow? is it because the stock ecu can't handle it or what?

 

read what Mahjik just typed... he already answered that

 

yes, your engine is now blown. please take it out of your car and mail it to me. ill pay for shipping.. then.... find a new motor

 

P.S. If you didnt sense my sarcasm, go shoot yourself

 

Look at it this way: $350 for a boost controller, or $5K for a new engine - you choose.

 

HAHA yeah i did...well thanks for the help guys!

 

I thought his fuel cut would hit way before 15psi on the stock ecu? (around 13psi) are you sure your gauge is reading correctly?

 

If he is spiking (which is most likely the case), the stock ECU will not react fast enought to cut the fuel.

 

Or 10$ for the Home Depot special

 

yeah im gonna go with the greddy profec b spec 2 boost controller...

 

Can anyone think of a reason that manufactorers use fuel cut instead of ingition cut. Maybe i'm wrong but it even sounds like a stupid thing to do. Small amount of slowly dying supply of injected fuel + lots of air doesn't seem very productive to me.

 

Same reason an intercooler the size of my fist isnt very smart. One point for mazda's engineers!

 

You should be OK running 10psi. What you need to do is a search on "pills". You can control your boost to 10psi without spending tons of $$, maybe $4.00 will do the trick. You should change the pill(s) at a minimum until you get a PFC.

 

This has been discussed before in an old thread. The term "fuel cut" is a misnomer; it's actually a combination of the two, partially due to the aforementioned lean a/f ratio that will result.

 

fuel cut has fewer "spontaneous" ignitions than ignition cut does.