300bhp target TD04 limitation
I know that the standard TD04 runs out of breath at about 265 - 270bhp.
Question is this. Is it the compressor or the exhaust turbine that is the limiting factor ? I know the Subaru spec exhaust turbine is the smallest one used on the TD04 family, so is this the bit that chokes the system ? |
check out Andy F's ( Andrew Forrest ) webpage, as he sells modified TD04's, and i'm pretty sure he goes into detail re what he does
ray |
Nahhh not that much detail
Trade secrets I bet |
Without testing any modded TD04s I'd suggest the turbine.........
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Originally Posted by ClintUK
Question is this. Is it the compressor or the exhaust turbine that is the limiting factor ? ? Ns04 |
The compressor flow output will be a restriction along with the size of the turbine housing ;)
Cheers |
I run a TD04 at about 270 bhp.
and measured the outlet temperature during continuous boost at the german autobahn. And suprisingly it wasn't as high as I expected. To me this indicates together with it's inability to give more boost than 1 bar at 7000 RPM that the turbine is rather restricting things. If it was the compressor it's outlet temp should be going to the roof. Also a 3" exhaust isn't really doing much on the TD04 which also indicates the turbine is the main restriction. |
Thanks for your thoughts and info guys.
S'pose I ought to bite the bullet / write the check and do what I thought I would have to anyway. Guess we mostly think its the exhaust turbine. |
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