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Home > Help Needed / General Tech Chat > Turbo running too hot?

JackZwiebel

113 Posts
Member #: 11786
Advanced Member

Hallo,

I bought a Turbo engine from a previous owner. Its a tuned engine running at 10psi. The turbo is a mix between Garret T2 and T3 - it should have less peak power but power at low rpm. It is a water cooled turbo.

Because of a problem with the engine I disasambled everything and noticed that the screws to the downpipe were a bit loose.
I had the Turbo wrapped in a heat protection wrap (Basalt, working temperature up to 1000°C, 1400°C peak).

When unwrapping the turbo to tighten the screws i noticed that the lower layer of the heat protection wrap was completly burned - it fell out black like coal. The Turbo itself doesnt look too bad.

Now my question, is it normal that the lower layer of the heat protection gets black? Or did the turbo get way too hot?
Is it generally recommendet to wrap the turbo. And if no, what are the alternatives, since the turbo is really close to the firewall and so on.


jonny f

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2091 Posts
Member #: 9894
Post Whore

Dorking

Most exhaust wrap will go hard and brittle over time and eventually fail. Wouldn't worry about it.

I use this on my bulkhead. https://www.ebay.co.uk/itm/301898384541
finished with aluminum tape and glued on with a little rtv if its a big area.


JackZwiebel

113 Posts
Member #: 11786
Advanced Member

thanks for the answer.
I understand that they get brittle over time - but the turbo ran only 3 or 4 hours with the new wrapping.
Now it looks like this:
https://abload.de/img/photo_2018-08-18_00-208c5j.jpg


Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

was it a decent brand? as I'd expect this of the cheaper stuff

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



JackZwiebel

113 Posts
Member #: 11786
Advanced Member

It was a decent brand, but appearently the turbo really runs too hot.

I have following Problem now:
I am using the standard ignition of the metro turbo with vaccuum.

I set the ignition that i have a max. of 25° spark advance.
At this setting, whenever the Turbo builds up pressure the engine stutters and fires back in the carburator. Also the turbo gets very hot, glowing bright after a gentle ride.

If i fet the ignition way earlyer....35-40° spark advance, the engine has way more power, runs perfectly fine without stutter and the turbo doesnt get hot. The engine temperature doesnt get too high either.

How is this possible? 35-40° seem way too much for me, i dont want to risk damaging the engine. Is it possible that the distributor or the vacuum adjustment is damaged?

edit: we measured the max spark advance by reving the engine up to about 4000rpm while standing with connected vacc, without load.

Edited by JackZwiebel on 2nd Oct, 2018.


Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

I nearly missed the issue here,

you need to set the advance with the vacuum advance disconnected, otherwise holding it a 400 revs wull have a significant manifold vacum which will add advance, proobably around 8-10 degrees.
What you are trying to set to 25 degrees is the advance under boost/high rpm so you really dont want that vac advance messing the setting up!

you should also be seing around 8-10 degrees at idle with the vac disconnected.

essentially I think you have it retarded which is causing the exhaust to get hot. at cruise when the vac advance will be working it is not uncommon to see advance figures in the mid-high 30's.

Also I should add a disclaimer here that you need to get the engine properly set up on a rolling road dyno, checking the fueling and adjusting the advance from somewhere safe and adding advance.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



theoneeyedlizard

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7259 Posts
Member #: 1268
The Boom Boom speaker Police!

Essex

So the screws for the downpipe were loose and the wrap is black. Couldn’t this just be soot from an exhaust leak?

Edited by theoneeyedlizard on 2nd Oct, 2018.

In the 13's at last!.. Just


Turbo Phil

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4619 Posts
Member #: 20
My sister is so fit I won't show anyone her picture

Lake District

As Joe says. Your ignition is to retarded your basically sending the burning mixture right out the open exhaust valve.

Phil.

WWW.TURBO-MINI.COM


JackZwiebel

113 Posts
Member #: 11786
Advanced Member

Thanks for your reply. That sounds simular to the manual settings from the metro turbo. They say 7° with vac disconnected at 1500rpm.

I am trying to get a setting a bit on the save side for driving around and running in the engine. It will be later set up on the dyno.


JackZwiebel

113 Posts
Member #: 11786
Advanced Member

I set it up at 8° at 1500 rpm without vacc now and it goes up to 25° without vacc at 4500 rpm.

It runs nice now but its running ok to a bit rich in cruise (1:11 - 1:12) but too lean at boost (goes up to 1:14-1:15). The higher the gear the leaner it gets.
Can it be the fuel pressure? The regulator is new and should work, but maybe i have to set it a bit higher in general?

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