Forced induction, exhaust manifold - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Bass Crazy · 10-23-2003, 04:08

Hey guys.

Just wondering if I could get a few opinions here.

How important is the exhaust manifold design on a turbo setup.
I'm talking of boost levels around the 10-15psi mark on an I6.
Is it more/less important then in a N/A setup?

The reason I'm asking is because over the past few years I have seen a few turbo setups using pretty poor looking manifolds and still managing to make some decent power figures.

Is maximum flow the key?

Simon.

gm dstroya · 10-23-2003, 04:31

a few people say who cares.. as long as it spins the turbine.

to a degree its true, but a well designed and high flowing manifold will mean better drivability as boost will build quicker thus producing more torque and the whole experience is far better then with a car that has poor flowing manifold.

and u have pm..

cheers.joe.

ebxr8240 · 10-23-2003, 04:47

Yes some are small and short. But it's more designed for low end power.As against longer equal length manifolds takes longer to spool or takes power higher in rev range due to velocity being lower..Pro's and con's both ways not too far away from n/a..

Walkinshaw · 10-23-2003, 08:28

There are a few good threads on performanceforums.com regarding exhaust design. One memebr there, 6BOOST has a 554rwhp EB, and has spend many a hour designing, building and dyno testing manafolds. Read up on a few of those threads.

ohhhhhhhh why does bass get a PM Joe and not me :(.........lol jk

gm dstroya · 10-23-2003, 14:49

walky u have pm :p

cheers.joe.

Bass Crazy · 10-23-2003, 18:13

Thanks Heaps guys.

Joe, You are a CHAMP!

carazy · 10-29-2003, 04:01

Joe if your a champ I need me this dirty PM aswell!!!
Yeah I'd say it's important if you want a good setup.
If you want a nicely drivable smooth turbo then design is important but if you don't car where the power is as long as it's there then no problems.

ebxr8240 · 12-05-2003, 02:43

What may look good as far as n/a goes may not be that good under boost.Ie I would say 3-2-1 X 2 to turbo would be better than 6-1 as the velocity is less at lower engine speeds..
S/C as big as your port atleast as it wont effect low down torque and scavenging isn't an issue like n/a ...

aaron_hogan · 12-10-2003, 21:23

This is a pic of possibly the best manifold i've ever seen in the flesh with one exception, the wastegate outlet is not split pulse. Other than that its a work of art and took MANY hours to complete.

FREE PLUG: Made by Nick @ TurboWorx in Kelior
P.S. Oh and its for a 250 X-flow in a Cortina. Not my manifold.
P.P.S Pics of my manifold (as made by a mate) coming soon.
P.P.P.S Thanks to geordo @ fullboost for the pics aaaaages ago.

xf6250 · 12-11-2003, 00:42

aaron_hogan that turbo sits heaps forward doesnt it? that manifold looks tops, i got an A.I.T one for mine that i want to sell down the track and get a custom one made up.