Guigsy Posted August 6, 2011 Share Posted August 6, 2011 My new single turbo has neither. Does one have an advantage over the other? or are they both useless Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 6, 2011 Share Posted August 6, 2011 Blanket, they can't vibrate and crack, they are 100% more efficient, they need no fabrication, and they work. Good ones work a LOT better than cheap ones. I see single turbo conversions that just look like an engine bay fire or brake fluid reservoir melt down just waiting to happen. At best it says the car only gets little bursts of speed, at worst it says whoever made the kit is either in ignorance of the awesome convected and radiated heat of a turbo on a long uphill pull, or doesn't care of the consequences. Quote Link to comment Share on other sites More sharing options...
Guigsy Posted August 6, 2011 Author Share Posted August 6, 2011 Cheers chris. Blanket it is then. My new cars engine bay looks ok to me but I don't know much. but I'd like it a bit more tidy. I've got a big long breather pipe. And the garage mentioned maybe changing them for a small filter. But we decided to leave it as it is. Any benefits to that? Quote Link to comment Share on other sites More sharing options...
imi Posted August 6, 2011 Share Posted August 6, 2011 personally never understood the concept of a heatsheild specially the ones on offer for aftermarket turbos AND also aftermarket cone filters. I can see them working as splashguards for water and similar liquids, but not for heat. I've used a turbo blanket (as per Terry S's recommendation) for the past 3 years without any issues. i would dread to think what the under bonnet temps would be like without it. Quote Link to comment Share on other sites More sharing options...
jagman Posted August 7, 2011 Share Posted August 7, 2011 The author thus calculated all the heat transfer coefficients by carrying out a turbocharger energy balance. He showed that heat transfer to the surroundings accounts for 70% of the total heat power lost by the turbine. The heat power transferred to the compressor accounts for only 10%. Finally, the author showed that the total heat power can reach 8 times the turbine mechanical power at low rotational speeds and small flows." the above From a study paper on thermodynamics in turbos ,a small single turbo would give around enough heat for 35 power showers !! Quote Link to comment Share on other sites More sharing options...
Westy Posted August 7, 2011 Share Posted August 7, 2011 Does turbo size affect this guys!? In other words as you increase the size of the turbo, does there come a point that a blanket could become detrimental to performance!? Just trying to get my head round this. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 7, 2011 Share Posted August 7, 2011 No, retaining heat energy within the turbine and pre the the turbine will make it more efficient. Only downside could be material degradation if the turbine or manifold shell is unable to deal with the cyclic heat. That's why Garrett list Ni-Resist (Trade marked high nickel content cast iron) for turbine housings on high performance petrol engines, and why diesel turbine housings suffer problems when used on petrol engines with high EGT's. Quote Link to comment Share on other sites More sharing options...
jagman Posted August 7, 2011 Share Posted August 7, 2011 The downside Chris mentioned is known as "creep" or blade creep in my trade - it is down to the temperature /cycles and limits and compounded by load - bigger turbos have longer blades and thus more centrifugal loads . keeping in heat -reducing the 70% loss to air will improve the turbine , but will impact creep and blade clearances and water /oil feeds - creep also exists in the compressor blades As far as I know, not one turbo manufacturer has tested or designed a turbo use with heat blankets as a part of the design Quote Link to comment Share on other sites More sharing options...
Guigsy Posted August 10, 2011 Author Share Posted August 10, 2011 Cheers for the interesting info guys. I've ordered one and it arrived today. And came with 2 springs that I assume attach to the 4 fasteners but can't work out how they would fix :/ Any ideas. Ill find out on Friday when I pick the car up and get it home I guess Quote Link to comment Share on other sites More sharing options...
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