Suggestions on my Multi throttle m20 intake

[E30-323ti]

I wouldn't think so if you used an accumulator of some sort.

The Accumulator will dampen the pulses of each cylinder to give a more stable vacumn (important if you are using a MAP sensored ECU) I imagine it will also dampen the effects of the brake booster.

Also remeber the booster doesn't remove any air from the inlet, the vacumn is used to help pull the pedal with a big diaphram. In most EFI cars if you quickly pump the pedal a few times the idle will come up a bit (not down).

Give it a go, you'll find out quickly enough if it doesn't work!!

[BavarianBimmer]

I wouldn't think so if you used an accumulator of some sort.

The Accumulator will dampen the pulses of each cylinder to give a more stable vacumn (important if you are using a MAP sensored ECU) I imagine it will also dampen the effects of the brake booster.

Also remeber the booster doesn't remove any air from the inlet, the vacumn is used to help pull the pedal with a big diaphram. In most EFI cars if you quickly pump the pedal a few times the idle will come up a bit (not down).

Give it a go, you'll find out quickly enough if it doesn't work!!

I don't think so, it will only happen with an engine with an injection system (Idle Control Unit will raise the idle) if you pump quickly the pedal on an carberetted engine the idle FALL or you've a bad and very roughly idle :idea:

[rs4pro3]

ok accumulato you just mean a small manifold that the lines will run into and then the brake booster will draw vacume off that manifold?
Here is my plan drill and tap 6 holes one in each runner about .5 inch from the head(farthest away I can get). Screw in some hose barbs use a small 1-2 inch section of vacumer line of each to run to a 3/4" diam PVC pipe that will be sealed I'll have the ICV attached at one end and the Brake booster attached at the other end. with a check valve going to the booster of course.

[modifiede30]

Why not tap 3 for the booster and 3 for the vac lines? That way all 6 are tapped but it doesn't look as messy. I'd think 3 inlets would be sufficient for each purpose.

[rs4pro3]

Would probally work for the booster but not the ICV, as it would only be suppling air to three cylidners and not all 6 so 3 would run find but three would be running super rich.

[E30-323ti]

Why not tap 3 for the booster and 3 for the vac lines? That way all 6 are tapped but it doesn't look as messy. I'd think 3 inlets would be sufficient for each purpose.

Because 3 cyl's will be over fueling on warm-up etc...

The Idle does increase on a EFI car because the quick succession of pumps on the brakes causes more air to be drawn through the ISCV, thus increasing the idle, it's not a problem, it is normal.

But basically, take you 1/2" lines of each TB, link them all together with some more 1/2" line and take this to the sealed canister (what ever shape you like!!) from this you take of lines for the brake booster & ISCV and what ever other vacumn assisted things you need.
We have the same setup running on a 240Z with triple sidedrafts.

Have a look at this: http://www.geocities.com/ggclhm1/tbvacumn.jpg
or if this works:

or it is the last pic on this page, if this works:

http://www.geocities.com/ggclhm1/e30wheels.html

[rs4pro3]

Ok is half inch line off the TB needed? as I was planning on ussing 1/8 or so.(at least I've purchased 2 of those size barbs).
Ruffly what size should the accumulator be?

[E30-323ti]

I'd go with 1/2"

The one on the 240Z is a cylinder about 120mm dia and 150mm long.

[rs4pro3]

Thanks will do I'll have to cut down the hose Barbs so they don't cuase turbulance in the runners. or I guese I could just cut a half inch hole and glue in a piec of 1/2 pipe and just clamp the vacume lines to it.