Drilling rear bumper, turbo cars?

[baloo]

I recall seeing several turbo'd cars with drilled rear bumpers -- about 3" holes spaced maybe 2" apart, at least across the engine compartment.

I think this was for cooling purposes, although I liked the look.

Opinions regarding beneficial cooling effects?
Any advice in re. how to, where, why not , etc?
Thanks.

[s5uewf]

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/436704-rear-bumper-gets-very-hot-does-yours.html

I drilled mine near the turbo, above it, and beside it to help get the heat out from behind the bumper.

[baloo]

Originally Posted by s5uewf

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/436704-rear-bumper-gets-very-hot-does-yours.html

I drilled mine near the turbo, above it, and beside it to help get the heat out from behind the bumper.

s5uewf - thanks for your ref. to the thread from 2008! Great info, and thanks.

I'm leaning even more heavily toward water cooling the turbo jacket with a small MC radiator with fan in the rear fender well (and a small BMW water pump) -- plus drilling.

BTW, that 2008 thread mentioned Greff motors in Metairie!! I had 4 Alfas at the time, and I lived off Transcontinental in Metairie at the time. Greff was an elitist -- prices were out of this world for me at the time (a Med Student living at Welfare level), but he was the ONLY Alfa guy in town, and had lotsa knowledge -- unfortunately, he had the market.

BTW, what's the decryption of "s5uewf" ?

Thanks.

[TurboKraft]

Water-cooling the bearing housing really only serves to cool the turbo after engine shutoff in order to reduce the opportunity for oil coking. You would then need a t-stat switch in the system to cycle it on/off ala 951. It has a minimal effect on oil temps when running, and no effect on the exhaust temps.

Otherwise deal with heat at the source: the turbine housing. Thermal barrier coat it. Add a heat shield. Or do both. Force that heat out the turbine and through the muffler. If the muffler is radiating too much heat, thermal barrier coat it as well.

Or just drill holes in your car.

[s5uewf]

Chris, do you know what size blanket the GT35 turb needs? Is it a T4 or a t3?
I think I will add one to keep temps down under the bumper, but not seeing GT35 specific offerings just T3 or T4

[TurboKraft]

If your GT35R bolts up to the original headers, or B&B/Fabspeed/whatever headers, that's a T3 -- a very rectangular 4-bolt flange.

If you had a T04, it's a nearly square flange, a lot bigger, and you'd remember paying for the custom 1-off headers. ;-)

[Mocker]

Chris, have the insulating blankets made to fit over the turbo housing improved at all, or do you still recommend the metal shields?

[TurboKraft]

We have not seen any of the fabric-type insulating blankets last on the air-cooled Turbos. Our EGTs are just too high. For that reason, we stay with the metal shields:
* we make and sell a hard stainless shield -- simple and effective
* there are multi-layer foil shields that work well, retain a little more heat energy
* a product like Header Shield (through LN Engineering) should work best, but we have no first-hand experience to confirm

[Mocker]

Thanks, looks like I'll be ordering the stainless shield from you guys. Appreciate your input!

[baloo]

Originally Posted by TurboKraft

...........

Otherwise deal with heat at the source: the turbine housing. Thermal barrier coat it. Add a heat shield. Or do both. Force that heat out the turbine and through the muffler. If the muffler is radiating too much heat, thermal barrier coat it as well.

....

Chris,
"Thermal barrier coat"... I assume this is the ceramic type coating?
Paint or spray on?
Is this DIY ?
Any particular brand? Seems I recall numerous ads all with extreme claims.
Thanks.

[TurboKraft]

Originally Posted by baloo

Chris,
"Thermal barrier coat"... I assume this is the ceramic type coating?
Paint or spray on?
Is this DIY ?
Any particular brand? Seems I recall numerous ads all with extreme claims.
Thanks.

Yes, ceramic-type coating, not just a high-temp powdercoat or cerakote.

We've been partial to Jet Hot's extreme 2000 coating, but they've gotten quite expensive. Similarly performing coatings are available from other companies: Swain Tech, Polydyn, HPC, etc.