Hi everyone,

Just how close to the stock ECU is the base map on the PFC ? Im assuming its tweaked slightly ?

Cant find an answer to this question specifically using a search.

Thanks

Chris

 

I haven't actually sat down and ran the numbers from datalogs to compare the two, but I'm pretty sure the Power FC runs practically the same as the stock ECU, and a little leaner while boosting. This is from testing cars with the stock ECU and a wideband and then testing the same car with the Power FC. This is one reason I think people are kidding themselves when they call a Power FC a "safety mod." The more recent ones have less timing advance than the stock ECU.

Wade

 

Atleast its a little safer on the timing issue then with it slightly retarded when compared to the stock ecu from your last sentence. That's interesting about the fuel maps though, I would have thought the base maps would have been alittle richer since they are for a DP and catback. What was the A/F's ran with the stock ecu....I think they are on your web site.

Tim

 

Lightly modded cars with stock ECU's were maxxing out my wideband at 10:1, my car with practically every bolt on part, no cats, and stock turbos still ran in the 11:1 range at 10 psi. The Power FC I tested had me in the 12.5:1 range at 12-13psi of boost, I wish I had tested 10 psi on the PFC now, as I suspect it was similar a:f wise but can't prove it until I get another Power FC.

Wade

 

my recent dyno run with the stock ecu showed an A/F ratio of below 10:1 from 5k-7.5k rpm. This is running essentially stock boost.

I am running a downpipe and RB dual-tip exhaust

 

rynberg,

Thanks for the supporting info. I've tested several cars and the lightly modded or stock ones were always 10:1 or richer. I don't even test them any more because I'm sure this is the norm. The "3 mod rule" is not realistic.

Wade

 

I find this strange that you saw the PFC as running leaner. I haven't touched mine and I have a lot of black smoke any time I get hard on the throttle. I only have the stock cat remaining.

 

Mine was incredibly rich with the base maps based on smell, smoke, and my old Greddy 02/AF meter (4 wire) , and still is now but my FJO wideband is just being finished now so I'll know for sure.

I too have just about every bolt on except a MP (HF CAT). Of course my fuel pressure also seems really high so perhaps there's another reason.

 

Great info on your site Wade, PMS, PFC and fuel related.

I've got the extra bung welded on the DP for the wideband so next time I go, I'll check to see what A/F I'm running at.

As far as the 3 mod rule, as long as you hold any boost spikes to a minimal degree, not hitting more than 1 psi more than your trying to hit, it seems the stock ecu can handle an intake, med IC, dp and catback with no problems at 10 to 11 psi.

Tim

 

For those of you who are running really rich with the base maps. Maybe something else is the cause (like high fuel pressure). Maybe your maps aren't the "base mod" maps with no PIM adjustments. Maybe your car just doesn't need as much fuel as some others. Maybe your car isn't running as rich as you think. There are a lot of possible explanations.

Chuck Westbrook found pretty much the same thing on his car at 12-13 psi boost - a:f of mid 12:1 area. Although my car might not be a perfect representation of the average car, there are others who have found the same lean a:f's with the default maps.

IMO, it would be unwise to use the base maps without tuning on any car with more than a couple of bolt on parts.

BTW Tim, thanks for the compliment, glad you find the web page useful!

Wade