|Re: possible project, parts prices?
|| 2003-10-09 12:17:00 <Cully Paterson>
> Isn't the TD05H quite a small turbo? not much of an upgrade at all over
Physically it's a bit smaller, but it's got flow potential from hell
compared to other turbos of equivilent size. The rally boys run these at
28psi (that's not a typo) and expect them to last for 2-3 events before
rebuild (and they don't tend to break them, just ruin the thrusts). In
place of a CT26 it should provide mucho increase in response, and be good
for about 16psi. The only real issue is at what point it starts to overheat
the intake charge.
> I've certainly heard of a LOT of problems with EVO's blowing their
> turbos with even moderate boost increases
Um, see above re 28psi. Bear in mind that every different EVO had a
different turbo on it. Some of them (Evo6) had two different revisions of
turbo on them. The later ones went to a TD06 with the shaft
counter-rotating compared to normal turbos!?
> I know these are quite a common upgrade for 2.0l engines - I would just be
> little wary of putting them on something 50% larger.
The consensus seems to be that they'd be a great bolt on replacement for a
'26 in mild tune, but you wouldn't try for big horsepower on them. If you
could make them fit on a 1G you'd be onto a complete winner.
> Know anything about the IHI RHF-55 ball bearing turbo's? quite similar to
> TD05H I believe.
No, the RHF55 is brass bearing. Most of the RHF5 series (eg Subaru Legacy)
are ball bearing. Some of them are quite good, others are shocking (eg
RHF5-VIAN which is standard equip for Isuzu Bighorns - they *ALL* fail and
are not servicable. Alltech replaces one per day on average). Mostly
though they are fairly lightweight in the turbine shaft department, and not
candidates for abuse. The TD05 is definitely much stronger.
The big problem with trying to replace anything Toyota with anything else
bolt-on is that the exhaust flange doesn't match anything in the known
universe. The TD05H is the closest I've come across.
The boys here love MHI (Mitsi Heavy Industries) turbos. They rate the build
and design quality of them above anything else, and they're good out of the
box. The TD05 is standard with 360 degree thrust bearings.