Author Topic: M42 Turbo Manifold (Read 30623 times)

asubimmer · « **on:** June 20, 2006, 09:23:41 PM »

Well guys I know that there are at least a handfull of you guys that would be interested in a M42 turbo manifold. I have a few options of the design style that we could go with. I have a guy that is going to weld one up for me and I am going to see if he would be interested in making more for you guys. I haven't run that by him yet but if he has time to make them I really think he will jump at this.

anyway vote for what you would like to see.

1st We have the TUBULAR manifold:
-*-PRO's-*-
This is the most efficient manifold. The pipes are equal length and give you the least spool time and max HP.
-*-CON's-*-
This is the most expensive manifold.

2nd We have the LOG manifold:
-*-PRO's-*-
Fairly cheap to manufacture. USUALLY the log also allows you to keep your AC etc, but it looks like w/ the m42 the AC is going to have to come out. One of the AC hoses goes right through where the manifold pipes are prob going to be.
-*-CON's-*-
A well designed log manifold is anywhere from 75-90% as efficient as a tubular manifold. Is it worth it to you guys to not be quite as efficient to save some bucks?

3rd We have a FLIPPED and MODDED OEM manifold:
-*-PRO's-*-
This would be the cheapest manifold. Trade in your old manifold for the new and improved one

-*-CON's-*-
MAY not fit. I haven't tried to fit one yet but it looks borderline. Since our M42 is tilted the manifold may not be able to clear the VC if its flipped. If anyone knows for sure that would be great

haledj · « **Reply #1 on:** June 20, 2006, 11:04:33 PM »

I would do log for simplicity

nickmpower · « **Reply #2 on:** June 21, 2006, 12:00:06 AM »

flipped oem then tubular

asubimmer · « **Reply #3 on:** June 21, 2006, 03:23:47 PM »

I am also wondering how big of an intrest there is for a turbo manifold for the m42. Please let me know if you are at least interested in buying one. I don't know what design we are going w/ at the moment and I don't have a price. I just want to know an appozimate # of people that MAY (you aren't promising anything) want to buy one.

bm318ist · « **Reply #4 on:** June 21, 2006, 05:48:11 PM »

i actually used the oem manifold(flipped) it does not hit the vc it actually hits the reinforcement by the shock tower. i had to shorten all four tubes by an inch! the problem i encountered with the stock manifold is wherever you cut you must reinforce and tig weld!(the mig weld cracked in 3 months) the tig (with the reinfocement) lasted about 1 year.

asubimmer · « **Reply #5 on:** June 21, 2006, 07:04:01 PM »

yeah they are going to be made w/ a tig welder. If we can use the stock manifold flipped then its deff gonna be cheaper. Turn in your stock one + some $ and we keep on fabing them up.

nickmpower · « **Reply #6 on:** June 21, 2006, 07:54:17 PM »

if we could keep ac that would be nice

asubimmer · « **Reply #7 on:** June 21, 2006, 07:57:22 PM »

Quote from: nickmpower

if we could keep ac that would be nice

yeah that would be good for everyone, I do plan on taking mine out b/c I never use it even though its ice cold. I'll try to make it AC stay but it looks like its going to be pretty close.

silverblades181 · « **Reply #8 on:** June 21, 2006, 10:11:02 PM »

Tubular, if your going the turbo way, make sure your pockets are deep enough or just don't do it. My 2 cents anyway

asubimmer · « **Reply #9 on:** June 21, 2006, 10:24:59 PM »

What do you guys think of the stock manifold flipped? That would be the cheapest way to make a tubular manifold. I can even see about having them ceramic coated. They would obv be cleaned up and everything. The stock size pipes are actually all the diameter that we need. If they runners were larger than stock, the gas would loose some of its momentum and also b/c of the greater surface area, loose crucial heat!

Also I am assuming most people will want external wastegates. Am I correct in assuming this? They are really the only way to go if you are boosting. Internal wastgates suffer from boost creap MUCH easier than an external wastegate.

mrjezza · « **Reply #10 on:** June 22, 2006, 04:52:10 AM »

Will this manifold fit a RHD?

shellback · « **Reply #11 on:** June 22, 2006, 10:06:03 AM »

If I go this route, I must have my a/c - hot as fornicate down here!

asubimmer · « **Reply #12 on:** June 22, 2006, 11:06:21 AM »

Quote from: mrjezza

Will this manifold fit a RHD?

do you have any pics of your engine bay? the more the better.

I'll do my best to keep the AC. I'll take some pics in a little bit to show you guys the line that looks like its going to be in the way.

bmwman91 · « **Reply #13 on:** June 22, 2006, 01:22:13 PM »

If going Turbo, you may as well go 100%. Do the best manifold from the get-go, and use a S-AFC rather than just an AFPR & injectors. Not that going log and AFPR wouldn't work, it just is not the best way to do it.

bar73k · « **Reply #14 on:** June 29, 2006, 02:46:40 AM »

here is my manifold, im keeping the a/c but will be getting a new hose made because the old one is in the way of the manifold.
this is a right hand drive car, and will have a 3 inch dump pipe, things are pretty tight.

Poll

Pref?

Author Topic: M42 Turbo Manifold (Read 30623 times)

asubimmer

M42 Turbo Manifold

haledj

M42 Turbo Manifold

nickmpower

M42 Turbo Manifold

asubimmer

M42 Turbo Manifold

bm318ist

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asubimmer

M42 Turbo Manifold

nickmpower

M42 Turbo Manifold

asubimmer

M42 Turbo Manifold

silverblades181

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asubimmer

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mrjezza

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shellback

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asubimmer

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bmwman91

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bar73k

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