OzDane

Ok.

I've got a PFC with Hand controller for my 94 RX7 twin turbo.
I've had it for almost 8 months now but haven't installed it because the dyno tunning is pretty damn expensive.
Anyway I bought the PFC because I felt the car was probably running a bit lean, and I wanted more boost.
Not many mods to the car. Just intake, Y-pipe and straight through exhaust (Cat removed), and CAT back...
I had the engine rebuilt about 15K ago and it seemed fine. However since removing the CAT, and fitting a new set of turbo's (just standard turbos). I've found that the car is over boosting and ruining lean... really bad it is. I Don't wanna destroy this new engine...

So my question is, can I/should I install the PFC without getting it dyno'ed?
If so how do I fatten the mixture? is the base map ok to use? I know nothing about ECU's ; (

Thanks in advance for any help.. I really need it. I can't get the PFC Dyno'ed for a few months. But I really need to sort the mixture problem asap : (
I've looked through this forum for answers, but can't seem to find any yet?

MrRx

iTrader: (1)

You need to install the PFC and at least get something richer than stock, with your mods runing lean is not good at all.

Search around on this section Im sure their is someone with a map with mod's close to yours, but if your worried and cant afford turning would just increase your fuel by 10-15% from 2000rpm+

OzDane

Hey many thanks..

What confuses me is how does the PFC stock maps compare to the Stardard ECU maps.
Some people have told me that the PFC stardard maps (as it comes shipped) are unusable... and tuned for very advanced mods.

If I install the PFC do I need to worry about timing, boost ... etc etc ?
At this stage I just want a richer mixture?

BTW: MrRX I think we almost have the same car : )
http://www.users.on.net/~ozdane/MyRx7/rx7_front.JPG
http://www.users.on.net/~ozdane/MyRx7/rx7_side.JPG
http://www.users.on.net/~ozdane/MyRx7/rx7_rear.JPG

APEXL8T

Well today I was fortunate enough that Chuck W. was in town and really helped me sort out start up issues. I will say as a laymen to the PFC the information manipulation is mind numbing at 1st exposure. I tunned Haltech F4 and such which were easy.The parameters of adjustments, outside of the commander and the larger after market injectors have me thinking of never tunning it. I prefer to learn by apprenticship rather than blow a good ITO motor.
It takes time to learn the concepts to application so I know I will hire out.
Just having amap with someones elses timing "as I have just seen" can be dangerous. Just hire a tuner even for a street tune.

Thanks Chuck and Mark W.

OzDane

Thanks MrRx.

So I installed it. And wow the car seems to be running very nice, just using the standard 5.08 map. I'm really surprised actually. No surging or idlle problems.
Knock seems none existent on boost, although it does jump around slightly sometimes at low RPM's

But I'd still like to add some fuel just to be safe, until I can get a pro tune done.
Anyway when you say "just increase your fuel by 10-15% from 2000rpm+" is the best/easiest way to do this in the PIM settings? As in changing the 100% values to 110% from 2000rpm and up?

twokrx7

iTrader: (1)

Think about adding fuel as a function of MAP sensor voltage instead of rpm, no reason to add fuel under vacuum conditions. 2.5 volts is about atmospheric pressure and 3 volts is around 4-5 psi of boost, higher volts are higher boost. If you are worried about being lean under boost just add say 5% at 3 volts and 10% at 3.5 and up. This will keep you from richening up under cruise conditions but will add fuel to boosted areas at any rpm.

OzDane

Hey that is just what I'm looking for. Many Thanks : )