1zz Tb on a blitz supercharger ... Any good ?

[CrankyOldMan]

Finally spent some time with the Blitz, the 1ZZ throttle body corpse and a camera today.



My suspicions were confirmed: the intake flange is only sized for the 1NZ throttle body. There's an awful nasty step and potentially exposure of the gasket itself.



There isn't really room to modify the existing flange, because it's only about 1/2" thick.



The casting is also very thin, and not very smooth inside.

[tooter]

Originally Posted by CrankyOldMan

Finally spent some time with the Blitz, the 1ZZ throttle body corpse and a camera today.



My suspicions were confirmed: the intake flange is only sized for the 1NZ throttle body. There's an awful nasty step and potentially exposure of the gasket itself.

Yeah, I had that same issue with the very first prototype adaptor.

You could still make an adaptor plate that smoothly reduces to the stock diameter. You already have the perfect pattern. It's on the bottom of your 1ZZ throttle body.

I'd just drill 4 slightly larger non threaded holes 60mm square in some aluminium plate and get some longer throttle body studs to hold everything together and use a stock O ring gasket under the adaptor. You could then make a stock diameter bore hole in the center of the adaptor to fit your supercharger, and then file or Dremel it to flare out to the larger 1ZZ diameter at the top. You'd need to cut out a flat gasket for the throttle body to get around needing to groove it for an O ring, but it wouldn't be all that difficult to do.

Remember, this isn't just the engine passively pulling in air. It's the supercharger pumping it in. And ok, so there will be a slightly higher manifold vacuum in front of the supercharger, it would still be the larger throttle body that's metering the air.

[CrankyOldMan]

Originally Posted by tooter

You could still make an adaptor plate that smoothly reduces to the stock diameter. You already have the perfect pattern. It's on the bottom of your 1ZZ throttle body.

That would be the next logical step, but I was thinking from the "bolt-on" side of the garage. Not everyone has access to the facilities that we do. =)

A few alternatives (of varying feasibility) would be: buy a 50mm throttle body spacer and turn/grind the taper; scavenge the intake side of an xB kit and use the tooter TB flange; scavenge the intake side of an xB kit and make your own elbow/flange; learn to do lost-wax investment casting and make your own; etc. etc.

[47_MasoN_47]

Originally Posted by CrankyOldMan

That would be the next logical step, but I was thinking from the "bolt-on" side of the garage. Not everyone has access to the facilities that we do. =)

Thanks for that :) I don't have the tooling to do much more than open the box and bolt parts on. If it requires milling/lathing/etc. I'm just SOL.