BOV/Turbo problems

[Bea]

hey guys , im having some odd problems with my rev3 tubby, can anyone help please?

it s all explained here,..;

http://www.mr2oc.co.uk/index.php?name=F ... 581#451581

Thank you veyr much

[matt_mr2t]

I dont really get what you wrote

Is the car performing badly/oddly?

[Ian Geary]

Hi Bea,

If people aren't registered on MR2OC, then unfortunately your link won't work for them.

But your post doesn't sound too worrying. Smoke on startup that soon clears up could have been condensation, or perhaps excess fuel due to the choke mechanism. Can you see what colour it is?

Since decatting mine, the car exhaust is definitely dirtier, and smells a lot more (not that I go round sniffing exhausts).

I've got an HKS SSQV, and it will whistle and whoosh at low revs with quite light throttle adjustments. This is because it picks up relatively light pressure adjustments - not just when the full 13psi of full boost hits it. If you've got a cone or mushroom air filter, then this sort of noise will be even more apparant.

The stock boost gauge isn't very sensitive, and it's swings from -ve to zero won't really represent small changes in throttle position, and therefore the things that will open/close your BOV.

If you have an rattle/blowing noise on startup, it could be the turbo to manifold studs loose. Mine were loose, and i got a real tractor sound when cold. Taking off the turbo heat shield (remove cross braces, then turbo to intercooler hardpipe) will reveal all - look for traces of black soot to point to the leak.

Finally, oil on the turbo. If it was on the impeller side (air intake) then it could be oil cooming throug the positive crank ventilation (PCV) breather system, which is normal.

But if you can see a distinct puddle in the bottom of an air pipe, then it's likely the turbo seals are letting oil past. It doesn't sound like this is the case though, as your car isn't losing oil.

hth

Ian

[Bea]

sorry guys i didnt realize those who arent on mr2oc wouldn t be able tiu view this, so here r the prob;em discribed.....: thanks for all the replies , very much appreciated:D

hey guys, please help me out here, my car is behaving very oddly....

so, it all started last night when i noticed my exhausts smoking,.... well, could be a bit of oil burning , checked the level, its all good,... starting to drive, slowly,... after couple of min the smoke stopped,....ok, might ve not be anything serious, a bit of smoke got burned,.... its stopped, ... so , i m keeping an eye on that, and oil levels,... seems fine now,..... but, here s the problem...

i got a rev3, turbo should be kicking in at about 3k revs, right? change the gear, dump valve comes on,boosts at about 14 psi,... as it should be,...
now,... what s happening, i can hear the turbo spinning at 2k revs and when i change the gear at around 2.5k revs ( cars s cold so im taking it easy:)) i hear the BOV going off , but according to my gauges, turbo s not spinning, the idle , next to speedo, is all the way down on "minus"... and my psi gauge isnt even reaching 0 psi, it stays in "VAC" section, and the car isnt "going"= feels slow/normal, like what it should feel like before the turbo kicks in.... now,.. that s odd

and then wheni take the car to higher revs, like 3-4k, gauges are showing boost and BOV is on, tubby spinning,......

what is going on????????

please help..... i know i ve got a blow somewhere on the manifold probably as i was told, wouldnt be nothing major, cars boosting fine and feels "fast" .....

any advice will be helpfull, did anyone experienced this???
thanks
B.


and also some more.......:

Here s what RichardPON is saying:
You'll have to clarify what the problem seems to be.

When you accelerate and give the engine partial load with partial throttle, you'll always hear the turbo spinning, and not see positive boost pressure.

When you're outside the boost threshold of the turbo like that, it's very possible to get the dump valve to sound, without registering boost, as there is still a flow of air from part open to closed throttle situations.

Basically, it sounds like you're outside the boost threshold - this is what some people commonly mistakenly refer to as lag, even though it isn't.

Where was the "oil on the turbo"? Compressor wheel, exhaust wheel, or on the outside of the turbo itself?

As far as I can see, you don't seem to have any problem with the car at all. You'll "hear" the car make boost without "seeing it" on the gauge, as there'll be a lot of induction noise at the time when the turbo begins to spool. Remember, a boost gauge shows positive pressure at the inlet manifold (if that's where it's taken from). The boost gauge isn't indicative of the turbo spinning.

hey,.. sorry guys for quoting everyone, such long answers,.. just wannna make sure i explain what the prob is,....

thanks Rich for looking intoo this,... basiclly....the problem is , that the car didnt behave like this before,....remember when we drove the car and just looove THAT sound?.....well,... im getting this as low as 2k rev , it all starts, then 2.5 k revs when i change the gear, BOV goes off, but the stock turbo idle isnt showing anything( unless i d take it pass 3k revs, which is normall range when the turbo should kick in) and also my boost gauge wont even get close to 0 psi,.. it just stays in "VAC " section off the gauge,..... now..... when i hear that sounds you ( and the rest of the population loves so much )....that means, turbo IS spinning, right?, now why so early- at 2k revs;, when it wasnt happening before, and why the gauges arent showing the turbo spinning, at least the stock one, if the boost one as you re saying wont show positive boost????


now, the oil on the turbo was ,.. i havent seen it, so i ll just try to explain what i was told,... its basiclly on the outside,.... bottom left part of the turbo if you standing behind the car, looking into engine,....oops, makes sense???

and then there is that smoke,.. which i have to say , hasnt happened since, the oil level is fine, cooling is fine, oil and coolant cap are nice and clean....



any ideas please?
thanks Rich, i reallly appeciate your help


by thw way,.. i ve got Blitz BOV...
_________________
Good girls get to Heaven, bad everywhere !

[Bea]

Hi Bea,

If people aren't registered on MR2OC, then unfortunately your link won't work for them.

But your post doesn't sound too worrying. Smoke on startup that soon clears up could have been condensation, or perhaps excess fuel due to the choke mechanism. Can you see what colour it is?

Since decatting mine, the car exhaust is definitely dirtier, and smells a lot more (not that I go round sniffing exhausts).

I've got an HKS SSQV, and it will whistle and whoosh at low revs with quite light throttle adjustments. This is because it picks up relatively light pressure adjustments - not just when the full 13psi of full boost hits it. If you've got a cone or mushroom air filter, then this sort of noise will be even more apparant.

The stock boost gauge isn't very sensitive, and it's swings from -ve to zero won't really represent small changes in throttle position, and therefore the things that will open/close your BOV.

If you have an rattle/blowing noise on startup, it could be the turbo to manifold studs loose. Mine were loose, and i got a real tractor sound when cold. Taking off the turbo heat shield (remove cross braces, then turbo to intercooler hardpipe) will reveal all - look for traces of black soot to point to the leak.

Finally, oil on the turbo. If it was on the impeller side (air intake) then it could be oil cooming throug the positive crank ventilation (PCV) breather system, which is normal.

But if you can see a distinct puddle in the bottom of an air pipe, then it's likely the turbo seals are letting oil past. It doesn't sound like this is the case though, as your car isn't losing oil.

hth

Ian

hi Ian, thanks for your reply,.... so here it is......

im not sure when the smoke started,but it was just white smoke, not sure, it was dark,....and i noticed it after about a ten min drive, the engine was warm, my fuel consumption is good, i ve got a blitz bov, and i know it doesnt sound as "loud" as hks one, , i know i d hear it even at lower revs, but only a little bit,.. what s odd is ,.. that it sounds like it on full throttle. but it actually isnt,....the stock turbo idle isnt showing anything,....and i have Apexi air filter....and i just noticed a much louder noise, sort of ratling sound when cold,... which i can actually hear from the tail pipes as well..... just had the flex and downpipe redone, brand new, quality job, so im sure it s nothing to do with exhaust system,....



Matt,...... the car is not performing badly,.. i d say exactly the opposite,....it actually, with something blowing, dont know what yet,.... trying to find out,.. but only with basic mods,.. its boosting easily up to 14 psi, seen it hitting 16 psi as well on full throttle.... so im not sure whether that s good,... some people say, it actually might be overboosting a bit,.....

[johndgt4]

Please get a proper boost gauge and ignore the stock one...if you up the boost you are asking for trouble!

Check your PCV system. Any leaks or blockages in this and it can make your turbo oil seals unseat and leak. Mine used to smoke after it had been idling for about a couple of minutes and this was the problem.

John