Seems like this has never been convered here before. But when I look at options for turbochargers, they have several options as to the type of turbine housings available. They include tangential and on-center housings. Now I know what the differences are that these options mean physically, but besides space considerations, why would a turbo buyer choose one over the other? Is one type of housing more efficient or produce more power than the other?

Tangential are generally more efficient, the only reason to use an on center housing is to fix packaging issues. As a matter of fact I don’t think that anyone is making new tangential housings.

Thanks. That was exactly the answer I was looking for.

No more tangential housings? Thats stupid. Why would they do that. Almost every turbo setup I've seen uses tangential housings. That makes no sense.

woops, that second sentance should read that no one is making on-center housings anymore... at least that I know of...

Hey TurboedTPI, those are some sick numbers! 570 rwhp @ 13lbs of boost? VERY nice. Is that through a stock TPI system? What RPM do you make that HP at? Thanks.

I wanna know too I think I have the same kit he has sitting in the box still ( T-62 from BBS ) and willbe runnnig the same motor

Turbonetics still offers on center housings.

Thanks alot guys. I have TPIS large tube runners, an extensivly ported stock base plate and plenum with a 58mm throttle body. It made that power at about 5450 rpm. I like the lower RPM powerband, because its alot easier on engine parts. If it revved higher, i bet the engine would have grenaded by now.

Yup, that's a lot of power to be making with a stock block and crank.

Sometimes I almost wish I had went single turbo. It might have been installed by now.

When you say extensively ported stock base, do you mean it's siamesed?

Nope, its not siamesed, its just ported and smoothed very nicely. I compared it to a TPIS big mouth base and the ported stock one just looked like it would flow more. But who knows. I just wanted to make a sleeper.