Author Topic: Custom-made RHD E30 318is extractor (Read 22798 times)

fabe · « **on:** August 03, 2009, 09:38:50 PM »

Continuation from HERE: http://www.m42club.com/forums/showthread.php?t=8782

My modified extractor has been diagnosed to have mini leaks from various joints, so decided to custom made a new stainless steel extractor from scratch.

and here are some of the photos:

#1 - work in progress.

#2 - almost done

#3 - Installed

#4 - made to clear the steering coupling

#5 - Stock RHD E30 318is extractor

#6 - my old extractor (modified from a E36 318is RHD extractor)

Initial Review:
The low end torque has increased significantly. the car does not hesitate in 2nd gear going from 1000rpm to the redline when I WOT.. The car just go... Maybe the LHD stock extractor has even better throttle response. I wouldn't be able to tell as there's no LHD E30 318is here for me to sample.

It's also smoother at the upper rev range.. Damn, should have done this much much earlier...

If anyone interested, can probably get the exhaust specialist to make a few sets at a better deal.. Only issue would be the freight charges from Malaysia..

DaneD · « **Reply #1 on:** August 04, 2009, 02:44:12 AM »

I may be interested, depending on cost of course

M42_Zach · « **Reply #2 on:** August 04, 2009, 01:11:28 PM »

Im very interested in this. Thats 2 names, :p

fabe · « **Reply #3 on:** September 08, 2009, 10:40:36 AM »

Some undercarriage photos

Routed for max clearance from the steering coupling

Here's the before photo

M42_Jester · « **Reply #4 on:** September 08, 2009, 07:03:29 PM »

i'm very interested....my exhaust manifold has those so called "mini leaks" as well

let me know the cost when u get it

are these just for the E30?

P. Kennedy · « **Reply #5 on:** September 08, 2009, 09:39:53 PM »

Beautiful piece. I love that you call it an "extractor." Add me to the list if they don't turn out to be exorbitantly priced.

fabe · « **Reply #6 on:** September 08, 2009, 10:08:05 PM »

Quote from: P. Kennedy;78124

Beautiful piece. I love that you call it an "extractor." Add me to the list if they don't turn out to be exorbitantly priced.

This is made for RHD E30.. For ur E30, I assumed it's LHD, there should be more options available off the shelf..

P. Kennedy · « **Reply #7 on:** September 09, 2009, 02:11:45 PM »

Indeed, thank you. That occurred to me as well.

M42_Jester · « **Reply #8 on:** September 10, 2009, 09:02:04 PM »

Quote from: fabe;78126

This is made for RHD E30.. For ur E30, I assumed it's LHD, there should be more options available off the shelf..

is there much difference between the E30 headers, and the E36 headers?

fabe · « **Reply #9 on:** September 11, 2009, 04:45:00 AM »

Quote from: M42_Jester;78244

is there much difference between the E30 headers, and the E36 headers?

There's a link on the first post of this thread. Click on it and you'll see the difference between the E30 318is RHD and LHD headers...

Even for the E36 318is, the LHD and the RHD headers are different too.. the LHD header flows better too..

Here's how the E36 318is LHD header looks like:

and this is a modified E36 318is RHD header... pipe 1 and 4 has been modified but 2and 3 untouched before the Y joint..

LHD header has pretty much almost-equal length pipes. but the RHD header is far from having equal length pipes.

fabe · « **Reply #10 on:** August 21, 2010, 09:03:52 PM »

Made a few extractor for the few E30 M42 buddies here...

Laser cut flanges.

all the bits.

Purpose built jig

Was previously on 2" outlet, now it's running 2.5" SS pipe up till the centrebox, and then still on 2.2" to the rear... Still contemplating to go 2.5" all the way thru... Car feels good as it is, afraid that it might lose the necessary back pressure for lower rev range if I go 2.5" all the way...
Can feel better flowing thru out the rev range.... Feels better at the top end... Feels like the car goes faster towards 220kph on the speedo... previously, Vmax is about 225kph on the meter and 215kph on GPS... Have yet to try Vmax after this recent tweak...

romkasponka · « **Reply #11 on:** August 22, 2010, 12:57:02 AM »

Nice build! Is its lenght is the same like stock manifold? Why not four in to one? I'm looking for S42 exhaust manifold dimensions for my project.

fabe · « **Reply #12 on:** August 22, 2010, 02:07:59 AM »

Quote from: romkasponka;95734

Nice build! Is its lenght is the same like stock manifold? Why not four in to one? I'm looking for S42 exhaust manifold dimensions for my project.

Not sure what is the length for the stock manifold. Anyway, most aftermarket manifolds are for LHD... This one is customised to clear the RHD steering coupling... And also due to space constraint, kinda difficult to do a 4-1... But I have no complaints for this 4-2-1 design, at least everything looks smooth flowing or as good as it gets....

romkasponka · « **Reply #13 on:** August 23, 2010, 05:32:36 AM »

Is it calculated for any rpm? I'm thinking on custom manifold also. What formulas have you used?

fabe · « **Reply #14 on:** August 23, 2010, 08:43:58 AM »

Quote from: romkasponka;95773

Is it calculated for any rpm? I'm thinking on custom manifold also. What formulas have you used?

No particular formula. Just work within the limited space available.. The extractor was done by a local exhaust specialist.. I just 'supervise' and give suggestions. Wanted to have them equal length but not possible... But it's still miles better than the modified RHD E36 318is manifold or the stock E30 318is manifold (See pic below)

Stock RHD E30 318is manifold

My previous modified RHD E36 318is manifold

This is stock RHD E36 318is manifold