SoNiCa

After a lot of playing with the boost settings on PFC I'm thinking that something is wrong/weird. I'm driving a standard MY98 with a PFC ecu. First of all I turned off "Boost Control Kit" from the datalogit and set the limit to 0.8 bar of boost.It never reaches at these levels. I tried to alter boost duty cycle 30 to 90 with no success. It never pass over 0.5-6 bar while boost control kit turned off.

So I decided to try it again with the "Boost Control kit" ON. I set the limit at 0.8 bar with the duty.c of 70. It reachs to 0.81 very smoothly as it should be. I have no boost control kit so I thought that it may be a datalogit software bug and decided to check it from the commander. It also shows that the boost control is enabled. I try to increase the duty cycle to see if I can control the boost with the kit enabled and set it to 80 @0.8 bar. It kicks to 0.90 bar even I set the limit at 0.80 bar.

I know that Andy.F said that PFC does control the boost very well like the other boost controllers but why this happens to me? Any other factors can cause this? I've never troubled with the boost pressure on the standard ecu.

Cuneyt

Andy.F

"I try to increase the duty cycle to see if I can control the boost with the kit enabled and set it to 80 @0.8 bar. It kicks to 0.90 bar even I set the limit at 0.80 bar."


Yes it will do if you set the initial duty too high, adjust your start duty down as far as required to eliminate overshoot.

You adjust your boost setpoint to 0.8bar or whatever your boost target is then adjust the initial duty to achieve that set boost quickly but without overshoot.

SoNiCa

Thanks Andy

I dont have a "Apexi boost control kit" so isn't it that weird to control the boost pressure while it is turned ON. Because when I turn it off I can not pass over 0.5 bar boost pressure.

vulnax999

iTrader: (7)

I guess you're using the std boost solenoid .. this is controlled by the PFC and the arrangement is a bit like a Boost Control Kit.

Turning it off, the PFC doesn't control the boost solenoid so only boost allowed is what the wastegate spring allows .. turning it on the PFC uses OEM boost solenoid and control boost to the set level.
IMHO obviously.

Overshooting boost target is as above!

SoNiCa

Thanks vulnax999.! I thought the opposite. What is the maximum boost that I can achieve with PFC? Are there any limitation on MY98s?

Tone Loc

iTrader: (1)

I'm sure you were right first time..... boost control option turned off uses OEM solenoid and MAP sensor, boost control kit option turned on uses Apexi soleniod and MAP sensor. Or that's how mine works.

Limit of the MY97/98 OEM MAP sensor is about 1.7 bar ish iirc.

Tony.

Andy.F

If you don't have an Apexi boost control kit fitted then you need to turn it ON to control the boost via the OE kit.....yes, odd I know !

Andy

Tone Loc

iTrader: (1)

Now i am confused......

I have mine turned off and i'm using the OEM stuff to control boost, which it does quite nicely. Also the boost display gives the same readings as my boost gauge. If i had the setting the wrong way round it would expect the voltages from the map sensor to be from the Apexi version and the boost given would be wrong wouldn't it?

I'd best get out and have a play.......................

Tony.

Tone Loc

iTrader: (1)

Hmmm... seems i can control boost with the setting either way . I shall leave it with the boost control option on but if i set the boost above 1.00bar with the setting like this i get a permanent CEL.

Better get the manuals out and have a look, this rings a bell.... does anybody believe i've had this ecu for over a year now

Tony.

andy97

iTrader: (1)

Isnt the cel light for knock detect on apexi. You've exceeded the preset knock level which sets off the cel


Andy

Tone Loc

iTrader: (1)

LOL... id be a bit miffed at setting off the knock level CEL flash with just the ignition on but the engine not running .

The CEL can flash for knock detection, high air flow volatge and high idcs. None of which i'd expect to happen with the engine not running . The CEL i get is solid and happens when you select a boost over 1.00 bar, not when the boost actually goes over 1.00bar.

Tony.

SoNiCa

I'm also thinking the same thing as for the O2 Feedback now. Yesterday I took some logs at idle and at high revs with the new inj settings O2-F on/off. I will investigate the logs now.

Meanwhile, I feel that the boost duty cycle setting on my car is too high.(68) Yes, it reachs to 0.80 smoothly(no overshots) but considering about the duty cycle values for future boost target settings. What duty cycle would i use if I set the target boost to 1.0 bar or more in the future :/ The maximum duty cycle value is 90 so it may not capable of reaching the target boost. Actually, I've never tried 1.0 bar or more(because i belive it is not a toy to play) but I feel that I should lower it and give some tolerance for the future boost target settings Anyway I'll give it a try and lower it too see if it learns or not. I already come to "68" value from starting low to high but boost control kit issue made me confused.

and I think I'm talking too much with my terrible Englisjh