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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 02-22-2011, 02:04 PM   #21
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Any more information on the intake manifold? That's pretty sweet.
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Old 02-22-2011, 02:46 PM   #22
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Any more information on the intake manifold? That's pretty sweet.
It seems a nice piece, but I don't know how good it is since I 've not seen the inside of it. Cant be worst than the M54 intake. The throttle body attached to it seems custom made as well (80 mm)






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Old 02-23-2011, 12:32 AM   #23
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You've got a "picture" problem
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Old 02-23-2011, 02:16 AM   #24
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soo awesome.
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Old 02-23-2011, 02:22 AM   #25
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Thats a nice piece
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Old 02-23-2011, 04:50 AM   #26
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You've got a "picture" problem
Damn Imageshack, you don't see it?
How about this way?








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Old 02-23-2011, 07:00 AM   #27
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Guys, I know it looks pretty and all....but that manifold is going to work like azz below 6000 RPM.

Those runners are HUGE....too big to make torque.

And with those injectors where they are....I bet it really struggles to idle...and at that, probably above 1500 RPM.

That's definitely a manifold to make HP....it's the right recipe, but not street-car HP.


Marc,

Can you measure the distance from the header flange to the end of the runner where it meets the plenum? I need the distance in MM through the center of the runner. (Measure the bottom distance + top distance, and devide by 2)

Also, can you measure runner size? (Cross sectional area)

I can plug that into my M54B30 engine analyzer and spit out an optimal powerband that this manifold would work in.

Email me if you want more engine specs thrown in there, as the more details I have, the more accurate I can make the power model.
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Old 02-23-2011, 07:14 AM   #28
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Those injectors are 1000cc, I'm pretty sure the EFI tuner will go for something more suitable. As for the injector position, I think they would be better on top and closer to the head. I'll send you the info today.
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Old 02-25-2011, 12:48 AM   #29
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I was wrong in my post above about a couple of things.

After reviewing the specs sent to me, this manifold is actually a "copy" of an OEM manifold. The main difference is that it doesn't have the DISA and 2 stage runner design. In theory, this will help higher RPM breathing, but there is one area of the manifold that's improperly exicuted that I think will cost higher RPM power. If Marc wants to post what I wrote to him, that's up to him...but I don't want to put that on here on my own.

Injector comments are still valid.

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Old 02-25-2011, 03:03 AM   #30
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Looks like an OBD2 e36 manifold... I'm curious to know if your head was port matched to the manifold, which seems like it could've been made for an M50 style head.
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Old 02-25-2011, 04:28 AM   #31
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Marc,

It appears I was wrong.

I thought the runner length would be shorter and wider, but it's just how I saw the manifold in the limited number of pictures I could see on the forum. (Filters in Saudi)

With a distance inside the head to the valve (at center) of 82mm, your total runner length as seen by the air is 307mm. This is almost dead on what the OEM M54B30 manifold is, with a target RPM range of 4200 to 6200 RPM according to my "combo" specs. (OEM valves, cams, intake tuned to the 3rd harmonic) The recommended cross sectional area of the runner for this runner length is 11.135 sq cm, which is pretty much dead on for a 38mm ID.

The 33mm intake valve is optimal for 5400 to 7400 RPM, but the combined intake port/valve flow is optimal for 3950 to 5950 RPM. Using a 34mm valve increases the valve RPM to 5660 to 7660 RPM....still needs port work to support it though.

A real issue I see on that intake is the massive flange-to-head area with 14 sq cm of area. (56.7 X 27.7 oval) This will slow the air velocity down excessively.....you generally try to make the runner smaller with a 3 degree taper towards the intake valves, and this entry area into the cylinder head port is horrible.

If you want to improve this intake, you need to have the flange area match the OEM "D-shape" of the M54 head as closely as possible. That "D" shape may not look efficient, but as the flow bench has told me in testing, it's got some power in it. Hopefully VAC motorsports isn't changing your M54 head to oval shape? Secondly, if you want to increase the RPM band this intake will work in, you'll have to cut some runner length. The trick here is that the more you cut off, the higher the tune RPM is, and the more cross sectional area in the runner it's going to want. So for me, looking at my software, the mimimum cross sectional area needs to be 11.135, which matches up with making the runners 25-30mm shorter. This will increase the tuned powerband to 4880 - 6880 RPM.

So in short: That manifold is a stock copy that may flow a bit better up top, but will lose lots of torque in the midrange.

Parking the injectors away from the valve does make power, but it's horrible at lower RPMs. I would definitely consider moving them to the top and angling them towards the valves. And 1000 CC...yeah....way too big. Something smaller will help power as well as the droplet size will be reduced.

If you plan to keep that manifold...at the least I would fix the flange size issue...
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Old 02-25-2011, 07:49 AM   #32
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Holy crap that's a lot of info. Did I write that?
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Old 02-25-2011, 10:20 AM   #33
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^interesting info.
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Old 02-25-2011, 02:02 PM   #34
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in regards to the injectors, i have a set of rc's that i used for 3000 miles, same as ones in the pics just lower cc's they are 660 which would be perfect for what you are trying to do here. I will sell them for 250 shipped! They are in perfect condition. PM me if ya want em.
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Old 02-26-2011, 12:05 PM   #35
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You're always good about providing a lot of information. Believe me, we all appreciate it.

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Holy crap that's a lot of info. Did I write that?
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Old 02-27-2011, 01:18 AM   #36
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You're always good about providing a lot of information. Believe me, we all appreciate it.
Thanks

When I write this stuff...it just kind of pours out...I don't feel like I have any perspective until I stop and read what I wrote. Maybe I'm possessed?
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Old 02-27-2011, 06:15 AM   #37
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Thanks to Canada customs, the first batch of engine parts from VAC are stuck in the warehouse since last friday....

UPS says it's because of the "bearings". They check all the shipments that contains "bearings"??? Please , let me have my stuff.
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Old 02-27-2011, 06:16 AM   #38
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Thanks

When I write this stuff...it just kind of pours out...I don't feel like I have any perspective until I stop and read what I wrote. Maybe I'm possessed?
You saved me a lot of time, and money, that's for sure.
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Old 02-27-2011, 12:10 PM   #39
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Thanks to Canada customs, the first batch of engine parts from VAC are stuck in the warehouse since last friday....

UPS says it's because of the "bearings". They check all the shipments that contains "bearings"??? Please , let me have my stuff.
There doesn't seem to be a system to it....crap just happens.
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Old 03-01-2011, 02:13 PM   #40
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There doesn't seem to be a system to it....crap just happens.
Maybe UPS lost their Bearings and the package was shipped to Luxembourg.
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