Tubular exhaust manifold?

[Hawk Thor Junior Member Find all posts View Profile Close Hawk Thor]

I noticed that alot of people are changing their cast-iron dump-pipes for 3" constant radius ones. I plan on doing this as well but I have a question.

Has anyone built or bought a 4-to-1 equal length runners, tubular exhaust manifold for their 1KZ-TE?

I just find it more wise to start at the motor and work my way back. That way I wouldn´t have to change my down-pipe and exhaust when I finally make the manifold.

Something similar to these.

[MickL Addicted PP Member Find all posts View Profile Close MickL]

Re: Tubular exhaust manifold?

It would have to be custom made and cost you a lot of money for near zero gain especially on a standard engine.

This is the type of mod you would do on a high performance engine if you were chasing every last KW.


Stick to the tried and proven, cost effective mods... exhaust, dump pipe, piggy back computer, intake filter and a boost controller. Expect 40-50% gains.

After this there is no value in spending thousands more for a couple more percent gain.... the 1kz head just doesn't flow enough to make significantly more power.

Search the forum... heaps of info on cost effective mods for power gains.

Mick

[Hawk Thor Junior Member Find all posts View Profile Close Hawk Thor]

Re: Tubular exhaust manifold?

Yeah, you make a good point about the flow of the head. Perhaps the log-manifold is plenty for these low RPM motors. I´m gonna keep my eyes open though when I take the turbo off to replace the gaskets, to see how the manifold looks. Might even pull it off to see how it matches the ports.

A smoother log-manifold might do a little good for not a lot of money. It could be made at home. Most custom logs use heavy wall steampipe, a bunch of 90° and 45° bends can be used to make the manifold, and any half-decent welder can weld them for you. The flanges can be made by tracing gaskets on a steel plate and cutting it out and filing to a finish. Then the flanges are machined after everything has been welded, so they sit flush against the mating flange.

Oh I´m also just day-dreaming about more power up some of the hills and more response in daily traffic.