Jump to content
SAU Community

Recommended Posts

Hi,

Can anyone help?

I am after an "idiots guide" to these following numbers. I know its for changing the boost but it will allow you to change both?!

I appear to have put my manual "somewhere safe" and can't find it.

Thanks in advance...

G.

Link to comment
https://www.sau.com.au/forums/topic/38185-regarding-powerfc-boost-control-kit/
Share on other sites

The second numbers you have highlighted is the Duty Cycle. This is basically the amount of time the solenoid stays open (bleeds) in realation to the amount of time it is shut and allows boost pressure to the wastegate. It is expressed as a percentage.

The minimum you can set (from memory) is 10%, which would be sending boost pressure to the solenoid 90% of the time, bleeding 10% of the time - it would be used for low boost pressure.

The maximum you can set is 90%, which has boost pressure going to the wastegate 10% of the time and bleeding 90% of the time.

If the boost is spiking (I would put money on it in your case, those duty cycles seem very, very high for those boost pressures), you need to adjust the duty cycle down.

If the boost is lazy, or it isnt reaching full boost, you will need to adjust the duty cycle up.

If you change your boost pressure up, adjust the duty cycle up at the same time, if down, adjust the duty cycle down. The power fc has a self learning mode, which will optimise the solenoid actuation for optimum boost control BUT, if you are miles out of the ball park, it wont have a chance. For example, if I adjust my boost pressure up by .2KG, I usually adjust my duty cycle up 4%. then just monitor on the peak hold, if it is spiking (more than .1kg) I will adjust the duty cycle down by 2%. If it isnt getting to boost, I adjust duty cycle up by 2% at a time, until it is just spinking a little (less than .1kg) - from there I let the power fc learn for itself.

If you ever need a copy of the english manual (although its for an RX-7) one is available on line at he apexi usa website, look under electronics, then documentation or someting like that.

  • 2 months later...

Is it also true that running boost above 1 or 1.2 bar using 3rd party boost controller and PowerFC will cause your engine check light on the dash to light on, because PowerFC could not monitor the boost anymore? The only remedy is using the dedicated Apexi boost control option that connects straight to the PowerFC, is this true or not?

The 255 value is the 'learning value' isnt it?

Not quite sure what it corresponds to so I think it is more of an arbitrary value than anything else. I can tell when mine is learning cos you can see this value changing & then it stays put once it has learnt.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Lol a few are like that with no intention of being reborn unfortunately. 
    • Done, I'll do mine soon too - whenver I take out the car next. I can cheat and make it quieter by turning off VCT at idle too - but I lose the braps
    • All trim back in wired running driving. Few things to follow up on but not far off the return to the road. att.6HN4wP38LTIOISkhA8eACoBFqzfgQMahZPLA8ut0pqE.mp4 att.w2q0ux2PGuqgQTj2Os13cNHQtqcSEcCAhD_CAXy_IQM.mp4
    • The trouble with phone apps is that they really do not know the sensitivity of the mic on each specific phone, whether there is some sort of cover or skin that can change that, etc etc. So the readings off them are not calibrated. You certainly couldn't be sure that you were even within 3 dB. I have the same app on two (actually more than that) different phones/tablets and the readings in the same room at the same time are never the same. I don't mind the apps - they are as useful as a dyno - if you're testing for delta from thing1 to thing2. But not to try to generate some sort of absolute value.
    • I'm gonna use the "Sound Meter" app from the Google Play Store and as close as I can bother to these procedures: 4. TEST METHOD FOR ALL VEHICLES EXCEPT PRE ADR83 IN-SERVICE GOODS VEHICLES AND OMNIBUSES 4.1 Microphone position 4.1.1 The microphone shall be directed towards the orifice of the exhaust outlet and shall be supported by a tripod or similar device not providing excessive acoustic reflection. The general requirements for positioning microphones are shown in the Appendix. 4.1.2 The nominal axis of maximum sensitivity of the microphone shall be substantially parallel to the test site surface and shall make an angle of 45 degrees ±10 degrees with the principal direction of gas flow from the exhaust. 4.1.3 In selecting the 45 degree alignment from the outlet of a motor vehicle fitted with two or more outlets, only the angle resulting in the microphone being farthest from any other outlet must be used. National Stationary Exhaust Noise Test Procedures for In-Service Motor Vehicles Page 3 4.1.4 The height of the microphone above the test site surface shall be equal to that of the orifice of the exhaust outlet ±25mm but shall not be less than 200mm above the test site surface. 4.1.5 The distance of the microphone from the exhaust outlet orifice shall be 500mm±25mm. 4.1.6 [Relates to vertical exhaust outlets] 4.1.7 For vehicles fitted with one exhaust outlet the microphone shall be placed so that the greatest possible distance is achieved between it and the vehicle. 4.1.8 [Relates to multi exhaust outlets] 4.1.9 [Relates to multi exhaust outlets] TLDR: 200mm off ground 45 degree angle relative to exhaust flow 500mm from tailpipe exit. (I probably won't use a tripod) Here's a photo, cause I read the instructions wrong myself.
×
×
  • Create New...