Dual Intake Throttle Bodies? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-11-2007, 01:01 PM
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Dual Intake Throttle Bodies?

I know I'm a newb when it comes to BMW's but I was looking at the Intake Mani and it seems like it'd be possible to put another TB on the other side. Relocating what's there currently.

Has this been done before?
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#2 (permalink) Old 09-11-2007, 04:47 PM
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No it has not been done before and i hope it never is done. It would ruin the current flow of the intake manifold. The intake manifold was engineered the way it is for a reason, its a balance of velocity and volume to get just right right flow characteristics. I have seen the factory intake manifolds/throttle bodies make over 280whp NAwhich is 140whp over stock, and well over 500whp when turbo'd...the engineers arent morons you know

now, if you really wanna get crazy and plan to make over 400hp then you need individual throttle bodies, which will MURDER your tq but increase the top end power a tad as seen above ^ the are made by DBilas and cost around $3k

Kyle Sutherland

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#3 (permalink) Old 09-11-2007, 05:39 PM
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Yeah I figured that BMW knew what they were doing with the Manifold engineering. I was just curious.

Has anyone taken a S50/M50 manifold and modified it to fit a M20 engine? Is that even technically/physically viable?

I bet just porting for flow would be best though.
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#4 (permalink) Old 09-11-2007, 06:44 PM
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Quote:
Originally Posted by kickarse
Yeah I figured that BMW knew what they were doing with the Manifold engineering. I was just curious.

Has anyone taken a S50/M50 manifold and modified it to fit a M20 engine? Is that even technically/physically viable?

I bet just porting for flow would be best though.
The M50 and S50 manifold are the same but nither of them will bolt to an M20 head. The runner ports and bolt flanges are completly different from the M20.
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#5 (permalink) Old 09-11-2007, 07:51 PM
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I wonder if it'd be possible to make one like the s14 but for the m20??
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#6 (permalink) Old 09-12-2007, 01:19 AM
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the S14 uses individual throttle bodies like the dbilas one i listed above

Kyle Sutherland

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1987 BMW 325es: Face & Butt Lifted/M50tu Swapped*Sold*
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#7 (permalink) Old 09-12-2007, 10:49 AM
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I see... thanks...
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#8 (permalink) Old 09-15-2007, 02:42 AM
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Quote:
Originally Posted by gotKRAUT


No it has not been done before and i hope it never is done. It would ruin the current flow of the intake manifold. The intake manifold was engineered the way it is for a reason, its a balance of velocity and volume to get just right right flow characteristics. I have seen the factory intake manifolds/throttle bodies make over 280whp NAwhich is 140whp over stock, and well over 500whp when turbo'd...the engineers arent morons you know

now, if you really wanna get crazy and plan to make over 400hp then you need individual throttle bodies, which will MURDER your tq but increase the top end power a tad as seen above ^ the are made by DBilas and cost around $3k
while some manifolds will allow 280whp NA..........an M20 one won't its not ideal for making topend power. The m20 one was designed more than 20 years ago at a time when the only way to test a different setup was to make one and test it which takes time and money so i don't think they did very many iterations and therefore there are definite improvements to be made........ there have been many improvements in manifolds over the last 30 years so perhaps you could try and adapt some of them (theories not manifolds).

Having said that putting another throttle body won't help things
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