Boost question R

[Nev]

Afternoon,

Boost on a R should be around 1bar, I believe, please confirm anyone who has a standard tune R and a gauge fitted.
I am currently getting approx 0.5bar and feels way down on power.

Is there anything that controls the boost other than the ecu. I have had this issue for a while but it has now started to be bother me, up to 20mph slower than it was. Originally I didn't have a gauge fitted so don't know what it used to be.
Our local specialist says he can't find anything wrong, smoke tested system etc, and says it feels as quick as any other R, but it's slower than it was....

I recently changed the TCV, do these have different specs according to model. I know they have something to do with limiting/controlling boost, but are they all the same?

Cheers

[T5RatherAmusin]

What r? A 60R should be 1 bar....
controlled by ecu, bcs tcv and actuator

[T5frankie]

What r? A 60R should be 1 bar....
controlled by ecu, bcs tcv and actuator

And your foot?

[Nev]

Thought so.

Assuming standard tune the ecu should be fine. The actuator rod feels right, no slack and tight spring, also garage checked that too.
When you say bcs TCV are you talking about one item? If that is the case then I need to know if they vary and I have an incorrect part fitted.

[Nev]

And your foot?

The foot works, max pressure at all times

[T5RatherAmusin]

Thought so.

Assuming standard tune the ecu should be fine. The actuator rod feels right, no slack and tight spring, also garage checked that too.
When you say bcs TCV are you talking about one item? If that is the case then I need to know if they vary and I have an incorrect part fitted.

No two sensors. One on your intercooler outlet (bcs- boost control sensor) and tcv by your air box with 3 pipes going to (turbo control valve)

[graemewelch]

might be worth replacing the recirc valve and trying a different maf and map sensor. your welcome to try mine.

[Nev]

No two sensors. One on your intercooler outlet (bcs- boost control sensor) and tcv by your air box with 3 pipes going to (turbo control valve)

Right, the bcs has not been looked at by me, I didn't know it existed. Will see if I can check it out, assuming it's not too difficult to get to.
I don't think there is anything serious, it's the finding the problem part that's difficult

[Nev]

might be worth replacing the recirc valve and trying a different maf and map sensor. your welcome to try mine.

Hi Graeme,

Where's this recirc valve, I shall have a look at that too. If I get no joy, then it may be worth swapping bits to see of it starts to fly again

[graemewelch]

is it possible your boost gauge is reading wrong and that the car had been mapped in the past and the ecu has been updated by volvo and wiped the the map. just a thought. you could be trying to fix something thats not broken

[graemewelch]

Hi Graeme,

Where's this recirc valve, I shall have a look at that too. If I get no joy, then it may be worth swapping bits to see of it starts to fly again

its on the turbo and is a bitch to do. not realy hard but but fiddly if you have sausage fingers

[M-R-P]

The BCS is boost control solenoid or TCV (turbo control valve) same thing. the boost pressure is detected by the bps/map sensor. is it possible your last tcv was plumbed-in wrong? that can make the car feel more aggressive.
To test the recirc, find the pipe that comes off it, pull it off the manifold connector and try to blow/suck down it. if pressure/vacuum escapes at all, it's split and needs changing. (you're gonna get a dirty mouth doing that - you could use a bicycle pump with an adapter on it)

[T5RatherAmusin]

aye I ment bps not bcs lol

[Nev]

The map has never been changed during my ownership.
Lost boost without any garage intervention, so unless it had been remapped with some sort of timer on the map that erased it by magic then that isn't an option.
Checked it all out, replaced TCV, got 0.5bar after plumbing in gauge. With original TCV there was 0 boost.
Gauge is reading as near as dammit right, checked with another gauge and both read the same.
I have no vacuum leaks, garage did smoke test of pipes and gave full bill of health. No faults showing, or there weren't, garage checked and fettled everything.
Car runs really well, but slow, well slower, it could hardly be described as slow but you know what I mean.

Since getting it back from the garage nothing has changed, nothing got worse so no issues have developed since, still as it was when they got it to repair, except without angle gear noises etc etc

I'm beginning to wonder if I should get it remapped, unless, as I wondered in earlier post, are the TCV's of different specs which could limit boost?

[M-R-P]

Are you 100% sure the new tcv is plumbed in correctly?

After that, I'd be looking for something like a split in the rubber connector that only shows up under load. Look for damp, oily patches on all the boost pipes and connections, that's a giveaway of a leak.
Then, possibly the inlet manifold gasket or even knackered turbo.

I wouldn't map it until it's running right.

[Nev]

Are you 100% sure the new tcv is plumbed in correctly?

After that, I'd be looking for something like a split in the rubber connector that only shows up under load. Look for damp, oily patches on all the boost pipes and connections, that's a giveaway of a leak.
Then, possibly the inlet manifold gasket or even knackered turbo.

I wouldn't map it until it's running right.

I've checked for leaks, and signs of leaks.
I will have to recheck piping to TCV but am certain it's correct, surely garage would have checked too as they knew it was newly fitted. I don't think turbo is knackered as it passed mot with no emission issues so seals are fine. There's no smoke at all from pipe, had someone watch from behind when they were trying to keep up.
Other than the boost not reading what it should it seems perfect.
I shall check piping again in morning.

[graemewelch]

I've checked for leaks, and signs of leaks.
I will have to recheck piping to TCV but am certain it's correct, surely garage would have checked too as they knew it was newly fitted. I don't think turbo is knackered as it passed mot with no emission issues so seals are fine. There's no smoke at all from pipe, had someone watch from behind when they were trying to keep up.
Other than the boost not reading what it should it seems perfect.
I shall check piping again in morning.

they should be colour coded so almost impossible to get them wrong. i wouldnt rely on emisions to prove the turbo is fine. bearing could be goosed and not allowing it to spool up as it should. probobly a sensor though

[960kg]

Just to add to the above ........don`t know what R??......so first check the actuator setting as the actuator rod wears elongated and the boost pressure will drop.....i have just reset mine with startling results!

The recirculating valve on the Mitsubishi TD04 family of turbos is tooooo robust and reliable to cause any problems on any model!.......the KKK24 i don`t know......

TCV`s are recommended to be replaced every 100,000 mls with NEW and not 2nd hand ones....if connected the wrong way, won`t work...if connected the correct way it will work the boost normally.

[graemewelch]

as its in the phase 2 area id say its a v70r with the 2.5 engine and k24 turbo

[LeeT5]

as its in the phase 2 area id say its a v70r with the 2.5 engine and k24 turbo

Phase 2 or P2 R?? Come on guys, we need to be specific here. Which model we talking about?
if it's a Phase 2 V70R >00 then 0.5 bar (7.2psi) is absolutely spot on!! Infact, that's high! OE spec on a 1997-2000 R is 4.2psi. On the later models 03> it's 4.4psi.

So, if your getting 0.5bar then that's good.

Worth noting that earlier R models (Phase 1, 2 + 3 models >00) don't have a BPS. They use the MAF, Throttle position and RPM to calculate boost via the ECM. The ECM will then actuate the BCS to operate the Turbo wastegate.