Before I start I will give you my mods:

m2 dp
jic cb
stock mp
apexi pfc + commander
apexi intake
100 octane for detonation insurance
greddy profec B
stock fuel
stock ic

I have always kept to the NO MORE THAN 10 POUNDS! rule. When I was on the dyno I put out 252hp and was off the scale rich.
I turned up the boost a little to about 12 pounds thinking I have heard it still safe and with that a/f ratio why not. Then ran and made 260 hp and the air/ fuel was readable it was about 11 flat. So I figured what the hell air fuel is still low so I cranked it to the most I felt the engine/stock turbos can handle with out problems.
Now 14 pounds I made 278hp! and the air/fuel was off the charts again( by the way off the charts is less then 10 on the air/fuel scale).
I was wondering if what I did was really stupid or if it was ok. I was told the stock motor can handle 14 no problem as well as stock turbos. I am well aware of heat soaking the ic. They had big fans on them and we let it cool after every run.
Am I missing the big picture or doing ok?

 

To clarifly the 14 psi pass I figured the pfc was making up for the extra boost so added more fuel.
I also read that the stock fuel can handle up to 330hp roughly.

 

The stock fuel system can support up to about 350 RWHP. There is nothing wrong with what you did. People do it all the time. You will most likely get a lot more HP than that if you lean the motor out a little. Keep the air fuel in the low 11's and you should be safe.

 

with a PFC you can run 14psi the problem is your turbos aren't gonna be happy and will probably start puking oil soon. GOOD NUMBERS THOUGH! not bad at all ! as long as A/F is in the low 11's you should be fine, a stock PFC will make the car run VERY VERY RICH. it will not blowup but your stock ic will probably start coming apart also.... lots of great stock stuff like your clutch etc will start to fail at 14psi.... just be prepared for the power LOL

 

I am just trying to figure why everyone says no more than 10 psi.

 

once you go past 10psi you don't get that much more power and you put alot more strain on the whole car with stock turbos

 

Vosko I have a act extreme pressure plate street/strip disk and m2 flywheel. My car only had 15,000 original miles so I hope the turbos dont blow out too fast. Sorry for forgetting to add the clutch/ flywheel.

 

Like Vosko said, the stock IC will start to come apart and the rubber IC pipes will split. If you have a stock ECU then 10 psi seems to be the magic number. Since you have a PFC, you can run more boost and just add fuel with your commander if you are lean.

 

i agree with josh you can run more it should be pretty safe probably why don't you run 12psi instead of 14 a happy medium

 

I disagree with this. You will get a lot more power running more than 10 psi with your stock turbos. It's your IC is holding you back. It will get heat soaked quickly do to it's very inadquate size. This will cause you not to gain much HP by increasing the boost.

 

I agree but hp is addictive. I baby my car and raerly ever have it set to high boost on the greddy pfc

 

not pfc I ment profec B I am just too excited

 

The warning is to not excede 10psi on a STOCK ECU! It sounds like your PFC is set up for much more than 10 psi. The maps in the Stock ecu only go to 12.5psi (13.5 in the transition region) Hence the FUEL CUT feature.

 

Your thinking was a bit off on this one, by just upping the boost you are not going to lean out the A/F ratio into an optimal range. Just because you were pig rich @ 10psi does not mean than boosting it to 12psi will lean it out effectively.. the PFC is compensating for the extra boost and is injecting even more fuel now. You need to adjust the actual maps with the commander or a datalogit to lean them out and tune correctly.. don't assume that just because you are safe at one boost level that you can just up it in 2psi increments.

 

well said mjw...my thoughts exactly.


baby steps....adjust fuel...slowly up boost...TAKE READINGS...adjust fuel....up boost slowly...DOUBLE CHECK....adjust fuel....DOUBLE CHECK....let car cool down...let car cool down.....double check...adjust fuel...adjust boost...double check readings

patience is what it takes to do it right.



j

 

Thanks thats kinda what I wanted to hear. It didnt sound right the way I was doing it, but I am not experiance with tuning

 

Don't sweat the 14 psi boost. I ran 14 psi on a remapped ecu for many moons with all the bolt-ons. 355-360 RWHP on the dyno and 12.07 sec 1/4 mile on street tires. Beat the crap out of it in the Texas heat and as a daily driver for 30 k miles. Just be smart, tune it well, tend to the heat, and be prepared to drop in a rebuild and some fresh turbos every now and again.