Anybody swapped the 2wd plenum for a 4wd? Just wondering is it a straight swap or does the fuel rail need to be modified?

 

Yes the fuel rail does need modding

Steve

 

is it really that worthwhile a mod?

 

Why would Ford change it if it wasn't better ?

Steve

 

Yes, deffo a big difference. My recent engine build, I just got the 4x4 cover and just bolted it to the 2WD plenum as its the same. Its bigger and flows better than the 2WD.

You're better off just getting a 4x4 fuel rail and moding the end to accept the 2WD regulator, or you could chop the mounting lug off the old 2WD cover, weld it to the 4x4 one and still use the 2WD fuel rail. But its more hassle.

 

How'd you fix fuel line to rail ?
Is flexi fuel hose jubilee clipped OK ?

 

Would anybody be able to fire up a picture of a modded fuel rail? Without a 4wd plenum to compare against i can't picture what needs to be modified.

 

thats how mine is mate

 

2WD fuel rail on a 4x4 plenum

IIRC 1 one of the bolts goes in an I had to make a small bracket to get the other to bolt to the cover.

P.S the elbow design is better on the 4x4

 

I will have a 4wd inlet for sale soon

Steve

 

Where's the bracket you made for the front mounting hole on the fuel rail?

 

As already stated above the 4x4 inlet is much better than the 2 piece chamber and throttle body elbow restriction that the 2wd set up the 4x4 unit flows much smoother and more freely.
I swapped over to 4x4 set up by my engine builder and it is indeed better.

 

I have recently purchased a Sierra and being in Australia am finding it difficult to get up to speed on these things. I have done a search but seems to be a bit of ambiguity in the info I read.

Visually is there a way I can tell whether my car has a 2wd or 4wd inlet? Car has had some money spent on it and spec is a little of a mystery to me.

 

on a 2wd the elbow after the throttle body unbolts from the plenum, on a 4x4 one it is all one piece

 

Thanks for the clarification. So from my research it seems a worthwile upgrade...my thing is running an SCS T38, and about 420hp.

Seem people run the std throttle body with them...are there any other throttle bodies that have nicer return springs and dont feel so clunky under foot. Seems to have some bind in it and told that normal for the setup?

 

im running a 2wd inlet with a spacer and modded elbow

 

Info needed mate....

 

The elbow has been cut out and a new metal welded in place to allow more flow - will get pics when its back from being worked on

 

ST Escos one is even better

I have one For Sale as well lol

Steve

 

I don't want to fuck about modding fuel rail and regulator tho mate.

 

You have to if you want to use a 4x4 inlet

 

4x4 fuel rail fits straight on

Steve

 

4x4 top, 2wd bottom.



Connector on normal 4x4 rail - its different to the 2wd clip on thing.



You could use the 4x4 reg, but as far as i know they are NLA so if it goes you'll have a hunt to try and find a used one

 

i had a small turbo escort plenum on mine useing a 2wd fuel rail and reg! taken it off now as i have a hart

 

Anyone got back to back dyno runs between 2wd inlet and 4wd inlet?

 

ive got a modded 2wd one on my saff.. although ill probably go for a hart style one in the future even if its just to make the bay look nicer...


was copied from the jenspeed style ones.. much larger inside now

 

Did you ever measure the boost after the intercooler before the throttle body against the plenum pressure before and after this mod?

 

no mate.. just what ever was showing on the gauge which reads from the take off on the plenum.. only did it as i thought it would be cheaper than buying another cover but ended up working out more expensive but heyho..

 

thats the mod im having done on mine

did you notice a difference at all mate?

 

i cant say i noticed anything really i was running an off the shelf chip on t34 at the time.. its since been mapped twice on gt3076 and made good power so must be ok .. i had the face of it skimmed after as was no longer flat after the welding .. the only reason id like the hart one is because it looks good really..

 

gibbo thats good to hear that the mod seems to work.

I cant justify spending a few hundred quid on a plenum where a few simple mods on the std plenum work just as well

 

Just smoothed the castings off, on the inside of the 4x4 one i'm about to fit to my car.