cast vs tubular

[rwd]

what are you think about cast manifold like this

is it possible that give better response and toque due to higher backpressure and the shorter lenght of runner

 

[dslocal]

I would tend to think not as a cast manifold is rougher inside and also isn't going to have as equal runner length.
Also backpressure isn't a good thing on a turbocharged car, I would think that the i.d of the manifold and the angle the exhaust exited the cylinder would make the biggest change if you were to build one.

Besides a tubular manifold looks way better.

 

[Bigzavs]

cast manifold will help out in the spooling department, but tubular is going to give you better overall power in the end

 

[apexi287]

You want good scavenging effects on the exhaust side and with a turbo car minimal to no back pressure. A equal length twin scroll tubular manifold will out perform a crappy cast any day.

 

[rwd]

apexi287: do you have gt4088r?

what a/r are you using?

do you have any torque before 4000rpm

i have one but .95 a/r and 1jz,and i dont have torque until 4700-5000rpm

i'm tinking do swap to 2jz or 1.5jz and change to .85 a/r for low end torque

 

[apexi287]

apexi287: do you have gt4088r?

what a/r are you using?

do you have any torque before 4000rpm

i have one but .95 a/r and 1jz,and i dont have torque until 4700-5000rpm

i'm tinking do swap to 2jz or 1.5jz and change to .85 a/r for low end torque

Yes I do with an .85 a/r spools very quick with great street manners. I build torque consistently up to 4k and past, a graph shows my torque at 300 ft/lbs right at 4k. Also consider the fact i don't hit full boost until about 3.5k.

 

[rwd]

Yes I do with an .85 a/r spools very quick with great street manners. I build torque consistently up to 4k and past, a graph shows my torque at 300 ft/lbs right at 4k. Also consider the fact i don't hit full boost until about 3.5k.

you only have 10 pound of boost , and you have 300ft/lbs at 4000rpm!!!! :aigo:

i touch 300ft/lbs at 4700rpm but at 20psi

can you post your dyno sheet

 

[Suprapowaz!(2)]

He's has 1.5JZ and .85 a/r.

 

[apexi287]

you only have 10 pound of boost , and you have 300ft/lbs at 4000rpm!!!! :aigo:

i touch 300ft/lbs at 4700rpm but at 20psi

can you post your dyno sheet

Dyno sheet is in my thread, single/stinger take a look if you'd like there's a lot in there.

 

[dejacky]

You want good scavenging effects on the exhaust side and with a turbo car minimal to no back pressure. A equal length twin scroll tubular manifold will out perform a crappy cast any day.

+1 I agree :naughty:.

 

[rwd]

where can i buy 2jzgte tubular headers, i looked ebay , suprastore , mvp , titanmotorsport , driftmotion ,horsepowerfreak . No one have
- divided t4
- cheap $$
- wastegate runner can fit in rhd mk3 body

 

[apexi287]

Check out driftmotion they should have something you're looking for, there are a lot out there though.