Hi guys,test drove another twin turbo today that was down on power,it felt more like a 1.0 than a3.0!

 

When i put my foot down the boost gauge went from -14 to 0 but didnt go above into the + side.

 

Ive done searches on here and if it was in safety boost id still get a + reading on the gauge,or would i?

 

The car is a mint 94 uk spec with dealer history,the seller is prepared to drop the price considerably which has rang a few alarm bells!

 

Any ideas if its in safety boost,or if its a more serious problem?

Other give away of a seized turbo is that if you drive it as hard as it will go for a few moments then stop it and open the bonnet you will smell the heat and maybe see some smoke from the exhaust manifold at the rear of the engine on the side thats seized. It gets seriously overheated due to the restriction on the exhaust with the turbo not spinning.

 

thats a good observation, check that out when ya go look at it next :)

Dunk300zx is the man to ask about siezed turbos. I've got his sieze one in my garage, nasty.

 

I forget how many tubs I have done now, 3 or 4 I think?

 

If they seize from oil starvation the engine will run perfectly smoothly, but will have a marked reduction in performance. Boost gauge will go no higher than 0 on full throttle, also very little or no smoke at all.

 

When they un-seize it's a different matter. The performance comes back to normal for a short time, but then soon after smoke will pour out of the zorsts and a funny 'grating' noise that i've never heard before. Turns out this noise is the turbo blades contacting the housing due to the brass turbo shaft bearings being totally worn out of tolerance.

 

mikeyv8, my advice is for you to treat this car as if it needs the engine out and turbos repairing.

 

:duffer:

I forget how many tubs I have done now, 3 or 4 I think?

 

If they seize from oil starvation the engine will run perfectly smoothly, but will have a marked reduction in performance. Boost gauge will go no higher than 0 on full throttle, also very little or no smoke at all.

 

When they un-seize it's a different matter. The performance comes back to normal for a short time, but then soon after smoke will pour out of the zorsts and a funny 'grating' noise that i've never heard before. Turns out this noise is the turbo blades contacting the housing due to the brass turbo shaft bearings being totally worn out of tolerance.

 

mikeyv8, my advice is for you to treat this car as if it needs the engine out and turbos repairing.

 

:duffer:

 

Yeah,thats what ive done,i reckon 1500 quid to get it sorted at least,that means id have to make him a silly offer for it,hes still says its the knock sensor,so it doesnt look like this ones for me,or anyone else neither :rofl:

 

Ill pop down to zedworld in the week and see whats around there i think,its only 5mins from me.

I live in tamworth if you need any help give me a call my number is 07900301503.

I live in tamworth if you need any help give me a call my number is 07900301503.

Whereabouts in Tamworth?I havent seen any zeds round here yet?

 

What have you got?

I live just off the glascote road i have got a 94 tt lwb.

That looks very nice!

 

Im down in Hopwas,looked at a few now but none have been right,infact i havent driven a tt that was running right!!