Re-Scaling Map Sensor For Pfc Boost Controller

[chiksluvit]

Just wondering if anyone knows how to rescale the map sensor on PFCs? Can this be done through datalogit?

here's the background story

My HC boost reading is -260mmHg when the engine's off (0mmHg), sensor output shows 1.5v on the HC which I gathered its correct after having done a search online and read through Paul's PFC guide

at Idle it shows -560mmHg which is pretty much right.

at stock boost level 7psi-ish, the HC shows near 0mmHg

I have also tried two sensors- both does the same thing, also tried to reset the PFC via HC and whilst it has reset everything else, it hasn't helped with the boost reading

I believe the map sensor is operational but the scaling was adjusted by previous owner of the PFC (if this can be done), god knows how many owners it has gone through.

have read through paul's PFC guide, although it does have reference to rescaling the map sensor but looks like the information is for djetro PFCs

[chiksluvit]

Here are the photos of the readings I've taken from my PFC when engines off

Here's the reading @ idle

[chiksluvit]

Anyone?

Or if anyone who has boost control kit installed in their PFC could please tell me if they're getting around 1.5v from the map sensor when the engines off?

[89CAL]

You cannot re-scale the MAP sensor, if its giving you false readings then there is either a problem with the MAP sensor, the wiring, or the Power FC itself.

If you have tried a different MAP sensor then it is unlikely to be that (are you using the right one?)

So that leaves either a wiring issue or an internal Power FC problem

Easy enough to check the wiring, put a meter from one end to the other checking for minimal resistance between each end of the wire

If this fails it may be a problem with the Power FC

I take it you have checked the connections to the MAP sensor? It would be a bit odd for there to be something causing this with the car off, but might pay to unplug the boost feed to the sensor and just hold it in free air. You could also check nothing is stuck in the map sensor inlet but I would be very suprised if this was the problem

[chiksluvit]

Yup thank you that helped a lot

The map sensor is from kando dynamics, tried two sensors and both have the same issue

I do have a genuine apexi one on the way, but it's probably a week away

The wiring harness is new so I doubt it's that.

I have a blitz turbo timer with built in boost gauge which feeds off the same line (stock boost gauge source) and they all read correctly

Guess I'll just patiently wait for my apexi sensor to arrive and hope for the best

[89CAL]

yeah i think you need the apexi sensor or you will have issues. Because you cant tell it what sensor you are using (on the boost control side anyway), it will assume its the apexi sensor. So anything different to that will not work properly

[chiksluvit]

The kando dynamics map sensor actually looked almost exactly the same as the apexi and having checked with the seller he claims it will work with PFC, avcr and emanage

I've got the new genuine apexi one in the post today so I will put that on later and see how that goes

Cheers

[89CAL]

Link to the map sensor you bought? I can't find one that looks anything like the Apexi one on their Ebay page, and thats about all I can find

[chiksluvit]

looks like I've got the wrong map sensor- tried the genuine apexi one and that is still doing the same thing

the one I bought is the same as the AVCR- had AVCR in my old car and I just assumed that its the same as the one in power fc boost controller kit

here's the link

http://www.ebay.com.au/itm/121263887995

Is this the correct one for PFC boost controller? PN: 949940-6270, denso 3 bar- seems to be the same as the one used in Djetro PFCs

http://www.ebay.com.au/itm/APEXi-Power-FC-Djetro-3bar-Map-Sensor-x-1-499-x001-/181162935162

Edited March 5, 2014 by chiksluvit

[89CAL]

499-X001 Looks like the proper Part number from APEXi

http://www.greenline.jp/catalogue/bproduct.php?type=electronics&subtype=Engine%20Management&brand=Apex&series=APEXi&name=Power+FC+Option+Part&fromlink=1

I sold my PFC boost control kit or I could have a look what it said.

[jiffo]

Here's mine.

[chiksluvit]

Thabks guys for your help

Will order one of those denso sensors, looks like it'll be expensive

[chiksluvit]

I can conclude that AVCR sensor is different compared to the PFC map sensor, had the wrong sensor so that's what was causing the boost numbers to not read right on the hand controller

Got another map sensor on it and it's now showing the right boost levels, verified against the blitz boost gauge

for anyone who's interested, the apexi denso one cost around $2~300, GM 3 bar sensor works but price varies and you'll need to do some soldering to fit the plug, so I thought I'd give this $40 no brand generic sensor a go and it was pretty spot on, been on the car for a few days now and it works fine