I did some searches and not finding it.....

Isn't there some difference between the early 87 and later 87+ intake manifolds? Something to do with spacers and how they mount to the head and fuel rail??

 

I just pulled an 88 and It appears identical to my early 87.

 

Any difference would be listed in the Service Tech info by MY.

Just looked: MY 88 page 2-02 says that the throttle valve housing has a different return spring arrangement.

 

The more I think about this, it has something to do with how the fuel rails sit on the manifold. The early ones need a spacer or something???

 

Early ones have a rubber isolator to mount the fuel rail which is best replaced with an aluminum spacer. Late fuel rails are solidly mounted.

Late manifolds have cast ribs around the flappy. (So the valve doesn't freeze?)

 

I seem to remember being advised that the GTS inlet manifolds are slightly different to the S4 and although they are physically interchangeable for whatever reason it is not optimal to do so.

If anyone knows what the differences are I would be interested given I have a spare early GTS manifold and cam covers I would like to refurbish/use on my S4 motor [or a new build GTS?].

Rgds

Fred

 

Could that be why my 87 doesn't have a flappy stop?

 

Hacker,

It is the Fuel Rails that have different mounting heights, not the intakes, ... see my post #13 in this thread from 6 years ago. https://rennlist.com/forums/928-foru...-question.html

Here is a pic from that thread....

"This will help for everyone to easily tell the difference between the early and late style fuel rails. As you can see in the photo early version has "squared" mounting tabs/ears and the late style has "rounded" mounting tabs/ears. Sorry for the fuzzy pic."





Cheers,

Dave

 

Awesome, thanks guys. That is exactly what I was thinking, just had the incorrect part on the mind

I'm asking because I'm heading over to Turbo Todd's later today to go over some project details. I'm going to pick through his parts bin to come away with every part one would want to powerder coat on an S4 so I don't have to disassemble mine.

When I do this refresh, it appears the best route is also grab some later fuel rails.

 

Early intakes do not have ribs around center of the intake next to flappy. This has been discussed years ago.

 

And we all know ribs equals more pleasure......