T5R boost question / help please

[Pupbelly]

Originally Posted by sdg1970

At this stage of the game, where much, much more has been replaced and eliminated, than what's left, then I'd stick that remapped ECU on and eliminate something else. If that doesn't work then I'd bite the bullet and send it to a Volvo specialist.

Are they just plug and play?
Thing is there’s no one down here in the south east that I can find (near Maidstone). Proper pain in the arse!

[Pupbelly]

Originally Posted by Luxobarge

You don't have a partially blocked exhaust do you? Any way you can run it for a short time without the cat connected?

Exhaust is supposed to be ok I’m told.

[Luxobarge]

Originally Posted by Pupbelly

Exhaust is supposed to be ok I’m told.

OK, it's just something that would tie in with excessive crankcase pressure and would also make the car feel sluggish and would not allow the turbo to spool up properly, so it kind of fits your symptoms. It's rare for them to block, but by no means unknown. Just a thought! I think several of us on here are as keen to solve your problem as you are......

[sdg1970]

Originally Posted by Pupbelly

Are they just plug and play?
Thing is there’s no one down here in the south east that I can find (near Maidstone). Proper pain in the arse!

Yes, just plug n play. Unbolt the cradle, pull out the one that's in there and then rinse n repeat. Easy!

[Pupbelly]

Originally Posted by Luxobarge

OK, it's just something that would tie in with excessive crankcase pressure and would also make the car feel sluggish and would not allow the turbo to spool up properly, so it kind of fits your symptoms. It's rare for them to block, but by no means unknown. Just a thought! I think several of us on here are as keen to solve your problem as you are......

I will agree it makes sense. The car does rev and fumes do exit the exhaust but maybe not enough?

Here’s another thing the extra vacuum gauge reads circa-20 (psi?) vacuum on tick over when cold but as the car warms up and at operating temperature the gauge shows -30 in fact off the dial but will return to 0 when revved etc. so is that the cat heating and expanding restricting flow?
Why will it still run and rev though?

Can I unbolt /ease off the down pipe at the turbo connection and give it a drive and see what happens? In theory it should boost as well as being damn noisy!

Thoughts? Does the vacuum reading suggest an exhaust issue?

[ITSv40]

Just a thought! I think several of us on here are as keen to solve your problem as you are......[/QUOTE]

Plus1 ^^^^^^

[Luxobarge]

Originally Posted by Pupbelly

Can I unbolt /ease off the down pipe at the turbo connection and give it a drive and see what happens? In theory it should boost as well as being damn noisy!

If you disconnect it there, I'd be worried about extremely hot exhaust gases doing damage in that area, and also that's before the O2 sensor isn't it, in which case you don't want to introduce that as a complicating factor. If it were me I think I'd try simply undoing the clamps for the cat and taking it out (temporarily), that's after the sensors (unless you have a post-cat sensor? Mine doesn't) and at least it leaves the downpipe to direct hot gases under the car. As you say, it'd be damn noisy, but would quickly confirm the exhaust as a cause or not, as the case may be. If you take those clamps off, you might want to buy a couple of replacements first (easily available from PFS) as they are prone to rusting, I've replaced mine at least once. It means crawling around under the car to do it, but if you jack it up high enough and make sure it's secure on ramps or decent axle stands it's not too bad.

[Pupbelly]

Originally Posted by Luxobarge

If you disconnect it there, I'd be worried about extremely hot exhaust gases doing damage in that area, and also that's before the O2 sensor isn't it, in which case you don't want to introduce that as a complicating factor. If it were me I think I'd try simply undoing the clamps for the cat and taking it out (temporarily), that's after the sensors (unless you have a post-cat sensor? Mine doesn't) and at least it leaves the downpipe to direct hot gases under the car. As you say, it'd be damn noisy, but would quickly confirm the exhaust as a cause or not, as the case may be. If you take those clamps off, you might want to buy a couple of replacements first (easily available from PFS) as they are prone to rusting, I've replaced mine at least once. It means crawling around under the car to do it, but if you jack it up high enough and make sure it's secure on ramps or decent axle stands it's not too bad.

It's still got its original system on from new! I think parting the cat from the system would be a whole world of pain, but i do know the system to turbo housing have been off in recent weeks (due to the turbo swap) so in theory should be easy to slacken off ease it apart and go for a quick go down the street from cold to reduce any heat issues and burning my hands too!

That's the theory anyway but happy to hear peoples thoughts. Any thoughts on the vacuum readings being so high once its warmed up?

[Pupbelly]

Originally Posted by sdg1970

Yes, just plug n play. Unbolt the cradle, pull out the one that's in there and then rinse n repeat. Easy!

This is on radar however I'm at the point where I think its more a mechanical thing than electronic but if the exhaust doesn't show any pointers I'll swap the ECU over and see what it does. At the moment the car starts, drives and runs very smoothly so at this stage I don't want to introduce another variable that 'could' c0ck things up further!

[Luxobarge]

Re. disconnecting the exhaust - fair enough, but I'd be worried about disconnecting it upstream of the O2 sensor, it may run so rough as a result that you won't get a decent indication of improvement or not, and it'll put the EML on too I'd have thought. Whatever, I'm agog to know what you find with this avenue of enquiry!

Cheers & all the best