Club 80-90 Forums

dave friday wrote:Spooling is a general for the turbo getting up to speed and making boost pressure,normally accompanied by a whistling noise.

Cheers Dave

it sounds like it gets to the boost point then blowes of ? not like a air sound...but spinning fast.

dave friday wrote:Spooling is a general for the turbo getting up to speed and making boost pressure,normally accompanied by a whistling noise.

Ok dave Friday got you

davegsm82 wrote:Hulky, you could bring it over to me if you like and I'll take a quick look for you. I'm in blyth and was at Volkscentre yesterday, good lads but busy I gather. I have the same engine in my 88 Devon, for now anyway...

Dave.

Yes that would be great PM me with time and address and I will be there

Chaeers John

Always hard to describe a noise, but it still sounds like the same problem that I had.
If the van has not lost any power then the likely cause is probobly the turbo wasegate seized shut. from what I can remember its like a little valve that is supposed to open at a pre set pressure. If it is seized it canot dump off exsesive boost that the turbo is producing, which then ends up lifting the blowoff valve on the inlet manifold.
I belive that must have been a secondary measure by Volkswagen to stop exsecive boost getting to the engine.
Might be wrong but sure somebody will put me right if I am.

One other thing to remember as well, you won't be able to replicate it on your drive way, the engine will have to be under load at maximum boost.

Thanks, Chris

chrisbeck wrote:Always hard to describe a noise, but it still sounds like the same problem that I had.
If the van has not lost any power then the likely cause is probobly the turbo wasegate seized shut. from what I can remember its like a little valve that is supposed to open at a pre set pressure. If it is seized it canot dump off exsesive boost that the turbo is producing, which then ends up lifting the blowoff valve on the inlet manifold.
I belive that must have been a secondary measure by Volkswagen to stop exsecive boost getting to the engine.
Might be wrong but sure somebody will put me right if I am.

Cheers Chris

Is it easy/possible to swop waste gate over to see if it is that as my brother in law has the same engine in his Atlantic and is ok for me to try his turbo / parts.Just to narrow things down

Changing the turbo isn't to hard, but the bolts will probobly be rusted/seized and can be a bit of a pig. The turbo bolts are 12 point I think so not standard type of bolt, and are two diferent lengths from memory. I used loads of heat on mine as i have got use of accetaline. Brickwerks sell them new but Beware of snapping them off as it would be an absolute ball ache for you to have to remove them.

Sorry forgot to say, I wouldn't try to swap the wastegate's, just try another turbo on there, but only if it's not to much hassel for you.

chrisbeck wrote:Sorry forgot to say, I wouldn't try to swap the wastegate's, just try another turbo on there, but only if it's not to much hassel for you.

Ok Chris I will think about swopping them over but will need to get gaskets ? Maybe next week.

As Chris says..see if you can swap the turbo and exhaust system,so you don't have to mess with the small nuts and studs on the turbo!

If you are just changing the turbo there is only one gasket, and it is from the turbo to the down pipe, no gasket between the turbo and exhaust manifold beleive it or not, just go carefull or you could end up with two turbo's with snapped bolts in them.
Have you tryed blocking off the blow off valve yet, just to make sure it is over boosting?

And another thing..do the leaky exhaust manifold first!

chrisbeck wrote:If you are just changing the turbo there is only one gasket, and it is from the turbo to the down pipe, no gasket between the turbo and exhaust manifold beleive it or not, just go carefull or you could end up with two turbo's with snapped bolts in them.
Have you tryed blocking off the blow off valve yet, just to make sure it is over boosting?

Just stuck a cork in blow off valve and had run round block and it blew it out.

there you go.
I take it that it was all quiet up to that point?

does this defo confirm its the turbo ? sorry for asking silly questions but am just learning..and have learned alot this last week.

There is a screw on the top of the blowoff valve, you could try screwing that in to the max and take it out for anothe drive just in case the spring inside has gone weak.
Also on the turbo there is a little canister with a small alen bolt and lock nut, you could try undoing that a few turns, it adjusts the boost from memory.
You never know sombody might have had a play in the past, but unlikely if you have only just noticed the problem.
Hope I have been of some help, and not just the voice of doom