Suggestions on my Multi throttle m20 intake

[rs4pro3]

Ok a lot of you know I've been working on making a Multi throttle m20 intake, I had gotten about half of it done and then slacked off well I've decided to start back up on it. Get it finished and install it on my car to test it.


Ok tomorrow I'm going to finally ground the short section of the stock manifold round so that the rubber connectors have a better seal.
Now here is my problem, the Brake booster requires a vacuum source to work. This vacuum source should be on the Engine side of the throttles as that is where the majority of the engine's vacuum is. Now as you can see I only have about 1 inch of metal to work with between the head and the rubber connectors that connect the cut stock runners to the throttle butterflies. At first I was thinking of drilling and tapping a small hose into each runner and threading in a small Hose bard and then have a small diameter pipe that a hose from every throttle would run into and the brake booster would draw vacuum off of that.
Now also I need to figure something out with the ICV which also must deposit air to the Engine side of the throttles so that the engine will run at idle, I was thinking of the using the same method for this but pretty soon having 12 short pieces of rubber hose and two round separate manifolds under the throttles is going to get pretty messy looking.
Now what I'm wondering If I drew just Vacuum off of one Cylinder would it be enough for the brake booster?
Or does any one have any ideas of how to get the ICV and brake booster systems to work.
Thanks.

[DaN]

Don't the e46 m3s and m5s have a plenum thats sealed around all the throttle body air horns?
Do you plan on doing that?
As far as vacuum for the brake booster, you might be able to tap one of the cylinders and have a vacuum reservoir somewhere. Or maybe make some sort of vacuum manifold that taps into each cylinder behind the throttle plates. something like a 1/2" piece of pipe that lays across and has a nipple for each cylinder, with short vacuum lines running to another set of nipples behind the throttle plate on each cylinder. That shouldn't be too hard. And you could hook up the icv into this manifold, and the brake booster.

[rs4pro3]

The second idea you posted about a hald inch of pipe is what I was thinking of doing at first. Most of the M-cars use a Hydro booster or at least the E28 did. Thye do use a Sealed Plenum which I'll have that directs the air to the 6 throttle bodies but if I tapped into it the vacume would be a lot weaker then on the E28 side. I know the e30 m3 used vacuume booster I guese I need to look more indepth into how it is setup.

[gstuning]

My S50B30 has 2 pipes coming from the engine side,

one is vacuum the other for the idle,
look over the ETK to see it,

[arnib]

This is the coolest private M20 project ever, rs4pro3 you rock! 8)

[rs4pro3]

Any body care to post the ETK screen shot for me?

[diegom6]

Any body care to post the ETK screen shot for me?

I will check right now the S50 Euro diagram on m ETK and will postit here.

Did you resolve the problem with the clearance between the brake booster and the plenum :?:

[rs4pro3]

Thanks, Ya I fixed the clearence issues I completly redid everything and ditch using the M5 throttle which probally would of been to much. Now I'm using some cut apart 40mm Dellorto carbs, that have been attached to a 2 inch section cut off a stock intake manifold.

[diegom6]

Man, first off, take many pics as possible, many pics detailed of the parts, and how did you cutted thhose Del Orto 40 carbs and hoe did you attached them ....

Thanks

Here are the pics, hope helps you!

[caracas_e30]

waow diegom6....im so used to seing that shit on english here. Everday i see tons of those and to see them in spanish is like wtf.

haha im from venezuela but i dont know what shit means carwise in spanish....

[rs4pro3]

Thanks Diego, it looks like though the ICV ports to each throttle are internal though(just how the E28 m5 intake was.
Now do you guys think the ICV and brake booster could work off the same manifold? Or would the ICV function be screwed up by the brake booster, I'd guese the idle would probally dive if you hit the brakes. So seperate manifolds would be needed.
Diego I'll take as many pics as possilbe. When it is done and if it works and works well I'll make more for people on a one at a time basis.

[BavarianBimmer]

Otherwise you can experiment with an vaccuum pump from an diesel engine :?:

[rs4pro3]

Hum any more info on that? it may be perfect for the brake booster sysstem, as I could mount it where the Ac compressor used to be or something.

[diegom6]

Otherwise you can experiment with an vaccuum pump from an diesel engine :?:

now that you mention that , the Jeep CRD Grand Cherokee 2.7L Benz engine doesn't bring a kind of pump with it's own cluth like an A/C compressor for the Brake booster?

It's ver compact , but it uses 6rib belt not "V" belt... :?

[BavarianBimmer]

the 324d use it