Turbo swap or new car, that is the question...

[Alex.]

Are you sure, that isn't how it is on a pre me7, but I don't know this modern stuff, I would just put an mbc on it , I never use the tbc's on any of my engines

That is how they were connected when I had full power and it also matches the Vadis diagram....



Alex.

[PNuT]

That was a productive drive home from work!




Does this mean I need a new wastegate? Much cheaper than a turbo.

Alex.

no, it means your waste gate is fine

it means for some reason the ecu is limiting boost & sending all the turbos pressure directly to the waste gate rather than bleeding some off!

I am not too hot on ME7 engines either but would suspect you may have an issue with the MAP sensor & it thinking you have more boost than you have!

[PNuT]

Are you sure, that isn't how it is on a pre me7, but I don't know this modern stuff, I would just put an mbc on it , I never use the tbc's on any of my engines

ME7 engines are not keen on that sort of thing! mbc's atmospheric dumps & decats & its dummy spitting time!

[claymore]

ME7 engines are not keen on that sort of thing! mbc's atmospheric dumps & decats & its dummy spitting time!

Yes, I keep forgetting that you can't do anything with ME7, I'm glad I've got a throttle cable

[claymore]

Hang on, is the center pipe off the tcb supposed to go to the recirc valve on me7, or does it go post maf like on the older cars, I'm sure the recirc should have a feed from the intake manifold.

[PNuT]

Yes, I keep forgetting that you can't do anything with ME7, I'm glad I've got a throttle cable

I agree, I am currently considering transplanting my old one into a newer one... maybe even a phase 2

that would upset rob in the local volvo parts department! he isn't keen on interchanging stuff!! what on earth he would make of your T10 project!!

[stribo]

Hang on, is the center pipe off the tcb supposed to go to the recirc valve on me7, or does it go post maf like on the older cars, I'm sure the recirc should have a feed from the intake manifold.

It goes post MAF, like the older cars.

[claymore]

It goes post MAF, like the older cars.

Best get that sorted first, so recirc would possibly be constantly open without boost pressure to keep it closed.

[Alex.]

Best get that sorted first, so recirc would possibly be constantly open without boost pressure to keep it closed.

Erm, while it might be that the pipe to the recirc valve should not come from the TCV, it is currently sitting in my garage. I changed it for a blanking plate last Friday.

Alex.

[claymore]

so, where is the middle pipe going to at the moment?

[claymore]

I also in the back of my mind seem to remember about the picture of the bcs pipework being the wrong way around, it might be worth just swapping the topp and bottom pipe over.

[jamesy12345]

Just found a nice picture, a bit late I know



//edit:

couple of daft ones:

have you capped the hose that went to the recric valve
is the TCV upside down (should be electrical connector side to compressor)
is the new TCV knackered...?

[jamesy12345]

...
have you capped the hose* that went to the recric valve...

*by that I meant the hose labelled 'bypass valve' in the diagram below

[Alex.]

no, it means your waste gate is fine

it means for some reason the ecu is limiting boost & sending all the turbos pressure directly to the waste gate rather than bleeding some off!

That makes sense, thinking about the operation of the turbo and wastegate.

I am not too hot on ME7 engines either but would suspect you may have an issue with the MAP sensor & it thinking you have more boost than you have!

Should be able to check/test the sensors.

Alex.

[Alex.]

so, where is the middle pipe going to at the moment?

The pipe that connected to the dump valve has been capped with a bolt and cable tie, so it should not leak...

Alex.

[Alex.]

Just found a nice picture, a bit late I know



//edit:

couple of daft ones:

have you capped the hose that went to the recric valve
is the TCV upside down (should be electrical connector side to compressor)
is the new TCV knackered...?

Cool, that diagram corresponds with how I thought they would be connected.
The recirc valve pipe has been capped and should not leak.
The TCV is the right way up and was brand new from Volvo without any change in the engine operation.

Alex.

[Alex.]

I will check that the recirc/MAF hose is connected correctly.

Alex.

[jamesy12345]

I had the same thought myself last night! So I fired up the old unreliable (XP) laptop and checked Vadis.
According to the figure there, my pipes are connected correctly.

Top of the TCV to the bottom of the turbo.
Middle of the TCV to the wastegate.
Bottom of the TCV to the dump valve.

Alex.

The pipe that connected to the dump valve has been capped with a bolt and cable tie, so it should not leak...

Alex.

sorry just for my understanding - previously you had the (blue) outlet of the TCV connected to recirc valve. Now you have fitted a blanking plate. Do you mean you have capped off the hose out of the TCV (the one that should go to turbo inlet pipe)...?

[Alex.]

sorry just for my understanding - previously you had the (blue) outlet of the TCV connected to recirc valve. Now you have fitted a blanking plate. Do you mean you have capped off the hose out of the TCV (the one that should go to turbo inlet pipe)...?

That is the thing to check tomorrow, I think that the pipe to the recirc valve does not come from the TCV.
I have capped the pipe from the recirc valve, not the TCV.

Alex.

[jamesy12345]

That is the thing to check tomorrow, I think that the pipe to the recirc valve does not come from the TCV.
I have capped the pipe from the recirc valve, not the TCV.

Alex.

OK - the hose connected to the recirc valve should come from the inlet manifold as in the diagram above..not if you have blanked the valve off though obviously. I was just wondering if the bleed off for the TCV was blocked