1FooknTiteFD

What's the most boost you can run with base pfc maps, and 91 octane? My old M2 ecu set it at 13psi or .9kg/cm, but I got the power FC now and didn't really get on it yet. I want to know what's the most I can boost safely with it.

209_rx7

I wouldnt go more than 12 psi on the stock system but only use cautiously when racing. Do not go over 10 for street driving or long periods of time, its unsafe for the turbos. Upgrade your intercooler if you want to boost higher...

15+ psi is fun

1FooknTiteFD

I have an intercooler, look at my signature, I have intake, exhaust, dp, ic, and now a power fc. The pfc is untuned so I don't know what the standard maps are good for. I've heard that they are good for my mods and nothing more bt the instruction manual that comes with it says only intake and exhaust with both cats in place with .9kgmm boost levels. That's why I want to know how much i can boost saftely

RotaryKnight

I ran a bar on the street with my stock twins controlled by the old XS ECU and when i went T04S w/ PFC I still ran a bar.

weaklink

1 bar is close to 15psi. I run the high setting with 93 octane, which works out to around 13 psi when its warm. when it's cold I can hit 14-15 psi. Boost takes a lot longer to build with the second setting IMO. After running the second setting for about a month, I now sometimes get a strange burning smell after a hard run, and there is soot on the underside of my hood. I'm guessing it is the turbos burning oil. I ran the stock fuel maps on the PFC with no problems. You can keep an eye on knock and it should be under 100 when you peak hold. I even took some fuel out of the higher cells, so stock map should be fine.

Cheuk in Seoul

12 -13 psi. I think you are taking a chance if you go any higher.

GoodfellaFD3S

iTrader: (213)

I agree...esp. with 91 octane in the tank. I'd find a place that sells 117 and mix in a gallon or two with each tank....

Freaky Monkey007

Just make ur own gas mix 93 wit xylone(is that how you spell that) which is 117 octane. Should come out to around 99 octane. Anyways.. Running anything more than about 12-13psi on the stockers is pushing it..

Johnny

dont run more than 12....not really because of the PFC ..but because your injectors cant take much more then that.... monitor you injector duty cycle victor...I know I can get mid 80% running .8 bar...

throw in some octane booster...I hate 91 octane

RotaryKnight

Good call Johnny....it's more that the injectors can't hold up not the PFC.

JspecFD

iTrader: (2)

BTW, most octane boosters are worthless as they only had several points to your octane rating so you go from 91.00 octane to say 91.04 octane.

1FooknTiteFD

Johnny, I hate 91 also, but I heard a rumor going around that we are about to get 93 octane in the bay area soon. Don't know if it's true or not, but there's no way of verifying it.

Anyways, I went on a couple of runs today. With the base maps, and the first setting, the boost is set at .8 kgmm for primary turbos and .7 kgmm for the secondary turbo. I did a couple of runs on the freeway and recorded a peak boost of .82 kgmm with the power fc which I estimate is roughly a little more than 12psi probably like 12.5 am I correct??

Anyways, thanks for your input guys, now the next question remains is how much to boost on 91 octane with the single turbo??? I spoke to tony on thursday and it should be coming in this week

GoodfellaFD3S

iTrader: (213)

I've been told that before by a mechanic friend of mine. Where did you come by this info? I'd like to see it print before I start telling my buddies about how useless octane booster really is.

I say mixing with race gas is the way to go.

Rich

mdpalmer

iTrader: (24)

I know this is over 7 years old, but are there any fresh opinions on this? I've been running 13-13.5 psi on 91 for the last year and a half and 15,000 miles or so with no apparent problems, other than fouling one of my plugs a month or so ago (somehow, oil was blowing past the plug, I replaced it and car runs as good as ever). The last month I've bumped it up to 14 psi (peak, bleeds off to 13.5 or so toward redline) and it runs great, I can really feel the difference in power. However, I don't beat on it at "HI" boost when it's "hot" outside (> 80 F) or the motor is "hot" (water > 210 F, oil > 240 F, air > 50 C). Mods are in my vbgarage, but basically I have

-POWER FC w/ datalogit
-rebuilt engine w/ used hard parts, new seals/springs (water, apex, oil, corner, etc.)
-K & N filter intake
-M2 med I/C + duct
-1300 cc secondary injectors (peak duties are ~82% @ 7500 rpm)
-supra fuel pump (nippon-denso)
-3" downpipe, high flow cat, M2 catback
-greddy profec b spec II b/c
-91 octane fuel
-non sequential stock turbos
-Chuck Westbrook non-seq map, dyno tuned at less boost (12.5 psi) over 1.5 years ago at 289 rwhp/243 rwtq on dynojet (see sig)
-leading timing at 14 psi boost is 11* at peak torque, split is 12* in same area
-stock ignition, BUR9EQ/EQP plugs all around
-AFR @ 13-14 psi is ~10.8-11, AFR at 10 psi is 10.9-11.1

Car's been great to me so far. My knock sensor is not very reliable, but my datalogs show no ping-spiking (thankfully). Would like to hear from others as to their experience. I think if you can keep the motor cool enough (air, water, oil, fuel), 14 psi on 91 octane is not a problem if your motor was built right.