29-12-2012, 11:48 PM
(29-12-2012, 11:37 PM)cwspellowe Wrote: Being "out of efficiency" isn't a completely bad thing, a T2 for example will be way down below 60% efficient at 30+psi but people still do it, there's no black and white rule. If you can get 70% efficiency or more then you're onto a winner.
The TD04 though is used on XUD's because it's bombproof, can withstand high PSI and it matches a gov modded XUD's rev range quite well. On a 2.1 I can't see the revs being raised that much as it's a much lazier engine, so the powerband would be quite narrow i'd imagine. People on here with TD04's make good boost way up to 5k+rpm, something I don't think the 2.1 would like. So say it builds boost by 2.5krpm, and your gov cuts in at 4krpm, you only get 1500rpm of usable boost. On a 1.9 you'd get more like 3k of boost.
Exactly why I'm not using a TD04 on my HDi

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