Thread: MAD built 800+ hp 200+ mph Sierra sapphire cosworth
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Old Dec 10, 2019 | 09:01 PM
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Mad_Mat
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Originally Posted by markk
I went from a Garrett 0.48 to a Holset 7cm2 and reduced EGT by over 250degC. The reduction in size is notable. T3 down to a T25 size, a tiny turbine wheel in comparison yet hugely more efficient.
thats really interesting and the complete opposite to what i would expect. Turbos are a real science and to be frank i know stuff all.

is it the turbine wheel passing the exhaust gas more efficiently that leads to the reduced temps.
its free-er flowing so heat doesnt get built up?? Bloody hell i dont understand .

I think spring 2020 i will be installing a EGT gauge so i can see what my little T35.55 is doing temp wise.
Last edited by Mad_Mat; Dec 10, 2019 at 09:05 PM.
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