Dragon, did you check your vacuum level with your car set to on, without the motor running? The Power FC will show a reading, usually lower than 0 even with the car off. Double check this to see how far off it is. I think the truth is somewhere between the two numbers. I would hope for the DEFI to be accurate, but sounds high to me. Let us know how much the Power FC is off.

eric

 

I have seen dozens of posts in the ecu forum where the PFC reads about 2 psi less than a separate gauge. Apparently there is some error in the display but it is actually reading the correct boost level. Example, it shows 10 psi on the display but is actually reading 12 psi and is running the fuel map for 12 psi.

BTW, you need to adjust the duty cycle on the primary turbo to reduce some of that spike.

 

what he said^

 

I dont want o mess with that yet ( duty cycle).

As for the PFC it reads -18

 

as fd racer found shortly after he broke the light out of his extra boost guage...the pfc is not accurate and reads about a lb or more higher than the actual boost is.

btw...i loke both their avatars...mmm mmmmm...

fd racer...you disappeared...call me sometime brutha.


j

 

What is there to mess with? You just lower it a bit and see if what happens at the transition. You just have to have a balance between spiking and too much dip at the transition.

 

The guage ism more reliable. Both my boost and water temps reads different from my greddy guages and the pfc comander.

 

So can you explain exactly how I go about changing the duty cycle?

What should I start with and what should I do not do??

I dont even know what the screen looks like off hand. I will go check shortly...

 

bump

 

decrease the duty cycle on the secondary turbo and increase it on the primary. Do a little at a time and see how it goes, then keep adjusting.


Decrease secondary duty cycle = less boost above 5k
Increase primary duty cycle = more boost below 5k

 

oh and read the manual!

 

The manual is worthless. It doesnt help it shows very slightly how to adjust but nothing on how much or what to and not to do.

Changing duty cycle isnt that just givng more / less fuel?
Isnt this a wastegate problem? Or am I just confused..
How will increaseing fuel help. Will it act like a fuel cut?
sorry but still learning

 

I meant decrease fuel help.

BTW messing the boost I am able keep it at 13 or below but still high

 

Need more info to help you out.

1.) Are you using any other boost controller (ie needle valves, pills, etc) to regulate the wastegate and precontrol?

2.) What are your current boost settings on the pfc? (4 answers here: Pri boost, Pri duty, Sec boost, Sec Duty)

3.) Where are you getting the spikes? Is it at the trasition (~4500 rpm)? How about towards redline, are you getting boost creep and calling it spike?

4.) What boost pressure do you want to run? give me a target pattern (ie 13-11-13)

5.) What is your average max injector duty cycle?


Thats good to start. If you cant answer #2 or #5 you definetly need to read the manual. It may not have that much info, but it at least will teach you how to read and adjust your own settings.

 

I have no other boost controller. I havent messed with the pills yet. I have ordered a greddy prof B. I found out that I had a spike when I got my gauges. Thats why I got the pfc amongst other things.

I get the spike at the transition. Then it sits for a aplit sec. then drops to about 12psi. Its not creeping it doesnt keep climbing at any time.

I am looking to run about 11-9-11 or 12-10-12. The safest setting with my mods I guess. Lets say for intake, CB and DP.

Aver max duty cycle I believe is 85% Its either a little more or less.

My settings now are

1. pr. .60 56%
sc. .50 64%

2. pr. .65 62%
sc. .55 70%
Wasnt how much or which ones to lower. So I lowered them all equally. Never touched percents..

 

This is the same problem I have. PFC is tuned to run with 1 bar boost. Same with the blitz boost controller. However, Defi says 1, or 1.1 when it spikes a while. PFC only shows 0.90-.92 bar when highlighted. I thought maybe something is wrong. I guess this thread answered my question. Thank's guys. A friend also suggested me to check the peak boost on the boost controller if it has the function.

 

This seems like its a problem that alot of people have. I always was against going non sequential but now it seems like a safety mod.

I would rather not if I dont have to.

 

It sounds like all you have is a pre-control problem. No problem, easy fix. Get a needle valve at Home Depot Racing ( ) and dial in less precontrol operation. Then adjust the boost a little if needed....then your done!

Oh and be carefull not to lower the boost on the pfc too much. If you lower it to the point where it's gonna boost more than you dial in you hit boost cut (fuel cut), which is bad.