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Turbo manifold on NA car?

loggyboy - 20/10/12 at 09:38 PM

Looking at a tubular manifold that loops over and down to a mounting for a turbo.
would it be suitable to cut the turbo flange off and just run it in to a downpipe ?
Would it loose a lot of power compared to a proper 4-1 or 4-2-1? For a standard zetec on 45s btw.

big_wasa - 20/10/12 at 10:13 PM

My thoughts would be towards the weight of the turbo hanging on it and cracking it.

theduck - 20/10/12 at 10:28 PM

Picture of said manifold? Tbh it should work just as well as a normal manifold if designed well.

scutter - 20/10/12 at 11:15 PM

Why not use the standard zetec manifold or are you after a performance gain?

ATB Dan.

snapper - 21/10/12 at 03:55 AM

A turbo manifold is not built for tuned length so will not perform as well as a 4 to 1
May not be as good as the standard Zetec manifold

cliftyhanger - 21/10/12 at 06:01 AM

I would indeed use the std ford offering. I suspect it may be substantially better than many of the aftermarket manifolds, many of which seem "designed" to look as if they produce power, but I have never seen actual back to back figures posted.

Or why not an st170 manifold?

loggyboy - 21/10/12 at 06:44 AM

I have a standard manifold but it looks quite restrictive. the one I'm looking at looks a lot more open. http://www.locostbuilders.co.uk/viewthread.php?tid=172764&page=1#pid1478779

big_wasa - 21/10/12 at 08:09 AM

My bad, I was thinking you wanted to hang a turbo on a four branch.
Of coarse it will work but dont waist money on jenveys/Itb's the other side. Even one with a bigger bore wont flow as well as a 4-1 or a 4-2-1. on a N/a engine.

Fine if you want a cheap and simple exhaust and are happy.

Its the breathing on a zetec that lifts a standard engine 30bhp on standard

[Edited on 21/10/12 by big_wasa]

theduck - 21/10/12 at 08:27 AM

You could always buy a turbo to hang on it...:

loggyboy - 21/10/12 at 08:37 AM

quote:
Originally posted by big_wasa
My bad, I was thinking you wanted to hang a turbo on a four branch. Of coarse it will work but dont waist money on jenveys or anything the other side. Even one with a bigger bore wont flow as well.

[Edited on 21/10/12 by big_wasa]

Already have a set of alpha 45s. Are you saying that the standard management would be ok with turbo style manifold but if combined with a the 45s will restrict it too much rendering them pointless??
Im only looking at it as a decent 4-1 or 421 will be quite expensive and need to be custom to suit routing out of the car, so was trying to find alternative routes, I could make a simple 1 pipe downpipe myself, but didnt fancy making up a complex system with MIG.

big_wasa - 21/10/12 at 08:43 AM

If the exhaust is not the best it can be then neither will the power out put.
Its the breathing on a zetec that lifts a standard engine 30bhp on standard. If your happy with a little less to make it easier / cheaper as I have done with my standard ecu then thats fine. Its how it drives that will be important and not the top number.

your not going to know what the differance is untill you have tried it.

scutter - 21/10/12 at 09:04 AM

The exhaust does make a massive difference, i got a 10 hp increase just from a collector change.

Why not try THIS

ATB Dan.

MikeRJ - 21/10/12 at 10:40 AM

quote:
Originally posted by loggyboy
Would it loose a lot of power compared to a proper 4-1 or 4-2-1? For a standard zetec on 45s btw.

The one you are looking at will probably have give similar performance to the standard Ford manifold, though the outlet is rather large for a normally aspirated application. Neither the turbo manifold nor the original Ford manifold is optimal for making good power as both are effectively 4 into 1 designs with extremely short primary lengths.

[Edited on 21/10/12 by MikeRJ]

scutter - 21/10/12 at 11:09 AM

Why not ask Coozer what he wants for the st170 manifold?

loggyboy - 21/10/12 at 11:52 AM

The trouble with either of the premade manifolds above (or any premade one) is the chance of it fitting in the chassis, and coming out at the right angles is very slim. And to get one made is likely to be Ł400ish. I could make one myself but the chances of getting a good finish and decent performance is also slim. It might just be one of the places I have to spend some cash!