m2cupcar

iTrader: (5)

There's a photo in "maximum boost" of a toyota gtp engine with the external gate mounted on the turbine housing. Looks as though the housing was drilled, ported and then a flange welded up to mount the gate. I know it takes some skill to weld to cast iron, but what are the other disadvantages to this? Anything to do with thermal reactions to dissimilar metals? It seems like a simple solution, and Corky praised it's performance - and the toyota gtp 4 bangers kicked some *** in their day. - rob

Damn! I can't believe I found a photo of it.

Markp

That's probably pretty close to an optimum setup. Other than being the port roof of the turbine housing. Under full boost it's probably optimal, off boost sub-optimal.

Mark

Braineack

iTrader: (62)

yeah I wonder how much it distrupts the exhaust when traveling around the turbine and out the exhaust.

m2cupcar

iTrader: (5)

Ok. It's optimal for a "race car" that's basically focused on going as fast as possible all the time. That's a reference to the angle I'm assuming- and perhaps the location just past the turbine flange where the housing begins to close in? If it were at a 90* housing that should help with off boost gas flow- no?

Just considering something different from the #4 runner location. I'd do one of those sandwich adapters, but that would mean putting an extended section in the downpipe- and I don't have much in the way of vertical space with the top mount and the taller engine. Both from Innovative- I haven't seen the angled one before.

F20turbo

some EVO turbo upgrades have a cast turbine housing with an external gate flange cast right into the housing. maybe you can find one of those possibly?

m2cupcar

iTrader: (5)

cool - had no idea - thanks