drb5

iTrader: (4)

these issue's i'm about to explain about, are things that happened before i went to the 05fe, fpr, avcr, etc, etc, but now that i have gone back to standard, or near enough standard, they are back again. the turbo is different 04, but not sure if the actuator is and it's the same 2 port i was using before....

1. after starting the car, cold or warm/hot, the car will hold back on slight boost at about 15000-3000 revs. sort of feels like it's strangling itself of boost. going up hills, you feel it more-so, although after maybe 10-20 minutes driving it goes away.

2. have had this one just a couple of times, although, it seems to be more consistent now. was going along bypass in fourth at about 5k revs, when all of a sudden, the kl went right up to red(i wasn't getting ANY activity prior to this). i came off boost a bit, just as a caution and when i went back on, there began a whistle. i remembered the noise from a long time ago and dicided to test it a wee bit. the whistle actually changes a little with how much boost is generated. this is why it makes me feel, it is mechanical and therefore the actuator. i did test it earlier on, by pushing it with a bar and i did find it catches a little bit just as i'm starting to move it, but after that it's all free. since then, i've started the car and drove without hearing the whistle again, but it came back later on

i'm basically wanting someone to say if these things can be cross referenced with the above parts being faulty? to add, i have tried to clean the solenoid, but didn't really change anything


any idea's???

Andy.F

Can you try it with a direct connection from turbo to wastegate to rule out boost control ? You should get a flat 0.5-0.7 bar boost profile.

Are you back on the std ecu and maf ? the hesitation sounds like it may be maf related ? what air filter are you on now ?

Andy

drb5

iTrader: (4)

still on the apexi air filter m8...i know, bad idea. i had the maf go as soon as the standard ecu was replaced...abviously went while link was fitted, so i dunno that that is the cause. will try the pipe asap for reference. just wanted to post this up first.

ta

Andy.F

You will run weak with the Apexi filter fitted, thats for sure. The calibration curve for that filter adds approx 10% more fuel as a baseline in the Power FC.

drb5

iTrader: (4)

that'll explain why i'm only getting to the last yellow light on afr then....just noticed that there

the pipe has dured the problem of the holding back, but kl was showing top yellow light quite a bit, but due to what you've just said above andy....i expect.

don't know what boost was, as no gauge fitted

dawes will be on it's way by the end of the week hopefully and also a mechanical boost gauges. so now i need to get an airbox and filter

SiHethers

Might be cheaper getting an induction kit that doesn't offset the MAF? Just a thought. Also, are you saying you're using the old MAF which was bust, or have you replaced it with a new one?

Simon

drb5

iTrader: (4)

replaced it with another secondhand one m8.


and maybe the straight pipe from ic/turbo inlet nipple to actuator, HASN'T helped the holding back!!!

went for another drive there and it was still doing it, so not the 2 port.

really, really beginning to hate this car!!!

SiHethers

The holding back is probably related to the induction kit, as you will be going too lean during spool up. The MY99/00 ecu doesn't move to openloop fuelling until ~5psi boost below 3000rpm, then any positive pressure above 3000rpm. This can often cause the characteristic surging on light throttles between 2-3000rpm.

Change the ind kit and I reckon that will cure it. I've got an airbox and filter for an MY99/00 you could borrow if you're near the midlands

Simon

drb5

iTrader: (4)

thanks simon, but i'm not close, but am on the look out for an airbox anyways

i'm thinking if it cures something, it won't cure it all. just got my head into there's something more than air wrong with this set up. something mechanical is wrong i reckon. like the whistle for example, it sounded too unlike air escaping or getting drawn in, nor did it sound like a turbo whistle.....i don't know. get the airbox and filter, boost gauge and dawes, then we'll see......unles there's more idea's?

drb5

iTrader: (4)

no-one else? or you lot as stuck as myself?

Andy.F

Try increasing the fuel pressure (if you still have that option ?) by approx 0.5 bar, if it was running weak then that should help. It doesn't mean it is safe though ! If the airflow signal value is say 10% down due to the induction kit, you could still be running too much ignition advance.

Andy

drb5

iTrader: (4)

so if and when the airbox goes on, what do you expect will happen then m8? air and fuel mixture will be ok, no det and anything else? if that's all, what would the noise possibly have been?

Andy.F

The airbox should stabilise the airflow and bring fuel/ign back to normal.

Noise could be from the turbo when/if it was overboosting ?

drb5

iTrader: (4)

why would it make a noise though? other than the usual spool up noise that is. this is a different one.

drb5

iTrader: (4)

ok, i've worked out how best to describe the whistle. imagine being on your mobile phone and getting too close to a hi-fi. the noise that it makes is the interferance that the hi-fi gives off through the speakers. this is the noise that the car makes even if the stereo is off or not. you can vary the noise a little lowering and hightening the revs a little, just as you would move to and from the hi-fi. shady explaination, but it works

RB5_245

Are on the re-circ dv, this opens a bit at cruise, but can be fooled into opening when you don't want it to. With an induction kit fitted you would hear it louder that with the standard airbox like u used to.

Why is you're car going back to standard anyway?

Dave.

BTW i have a standard airbox in the shed you can borrow to check. I may be down your direction in a week, or a little longer.

drb5

iTrader: (4)

car's going back to NEAR enough standard to put money towards a wee project.....hopefully

i've now fitted a forge atmospheric dv with red spring, dunno if that makes a difference. i'll be testing out whether or not this is the difference or not very soon.


defo would like to borrow it, if i haven't got one by then

cheers dave
dave

RB5_245

no bother, will promptly forget it

drb5

iTrader: (4)

looks as though i've got an airbox, just have to get the filter for it...no probs there, but i'm having difficulty in understanding how it might help get rid of this noise. it comes in when the turbo spool comes up to 0.5 bar and continues all the way up, even if your foot is full to the floor or not

drb5

iTrader: (4)

went for another spin this time with the straight pipe from ic inlet to actuator to check what boost was and it stayed below 0.7 bar, but no squeely noises. checked all ic pipework(samco's) and everything seems fine. any more idea's until i get the airbox on?

drb5

iTrader: (4)

ok, got the airbox and green panel filter(thanks doguster and coulty) and went for a spin. holding back is PRACTICALLY away....or maybe it's my mind playin funny buggers with me, but this squeely noise is still there. wd40'd up the actuator arm as alang instructed and still no difference. anyone available for a listen to a seriously guffuffled up scoob?

dij

Ive heard a noise similar to this on a WRX that was running 1.4 bar boost with an adjustable control.It would only do it when the boost whent past 0.8.

Perhaps what Andy F mentioned about overboosting could be the problem.
Not sure myself how this would make a noise though.

BTW,the noise I heard was like a high pitched whistle similar to the turbo whistle, but more like the turbine nipping the compressor housing (although a duff bearing would make the turbo smoke/stall),or as if a hose had come off.
Strange thing was that if the boost was turned down to 0.8 then the noise wouldnt come.

Interested to know what the outcome of this is.

drb5

iTrader: (4)

so am i!

really don't think it is a turbo whistle though. just doesn't sound like it, but we'll maybe find out some time