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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 05-04-2016, 11:30 AM
luekis luekis is offline
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E30 M20 throttle body upgrade?

I was looking around about m20's and saw one with individual throttle bodies...

I don't know much but, If anyone knows, how much HP more hp would I get? How hard would it be to upgrade it? Any pros and cons?

Again, I don't know much (I'm a noob) so any info would help. Thanks.

Last edited by luekis; 05-04-2016 at 11:41 AM.
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  #2  
Old 05-05-2016, 08:12 AM
markseven markseven is offline
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Quote:
Originally Posted by luekis View Post
I was looking around about m20's and saw one with individual throttle bodies...

I don't know much but, If anyone knows, how much HP more hp would I get? How hard would it be to upgrade it? Any pros and cons?

Again, I don't know much (I'm a noob) so any info would help. Thanks.
A new Dbilas kit is $2200 (includes VAT) + shipping.

IMO you need a MAF (vs AFM), tune, and headers to get the best from ITBs. Port matching and polishing is ideal.

Pros: Claimed 20hp increase, improved throttle response, great induction sound, looks cool as hell without the airbox

Cons: cost per WHP
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  #3  
Old 05-05-2016, 04:57 PM
luekis luekis is offline
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Quote:
Originally Posted by markseven View Post
A new Dbilas kit is $2200 (includes VAT) + shipping.

IMO you need a MAF (vs AFM), tune, and headers to get the best from ITBs. Port matching and polishing is ideal.

Pros: Claimed 20hp increase, improved throttle response, great induction sound, looks cool as hell without the airbox

Cons: cost per WHP

Thanks.
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  #4  
Old 05-07-2016, 04:51 AM
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sixpot_simon sixpot_simon is offline
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Quote:
Originally Posted by markseven View Post
Pros: Claimed 20hp increase, improved throttle response, great induction sound, looks cool as hell without the airbox
Sorry to be a naysayer, but it looks like the Dbilas setup retains the factory airbox etc

Apparently a bigger throttle body isn't any help on a stock M20, so I reckon the increase would be 0-5 hp.
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  #5  
Old 05-08-2016, 06:10 AM
markseven markseven is offline
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Originally Posted by sixpot_simon View Post
Sorry to be a naysayer, but it looks like the Dbilas setup retains the factory airbox etc

Apparently a bigger throttle body isn't any help on a stock M20, so I reckon the increase would be 0-5 hp.
IMO the stock airbox flows / filters well and is probably better than any aftermarket CAI. It's the AFM that is the restrictive and archaic component, hence my recommendation for a MAF
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Old 05-08-2016, 05:21 PM
M-technik-3 M-technik-3 is offline
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Originally Posted by markseven View Post
IMO the stock airbox flows / filters well and is probably better than any aftermarket CAI. It's the AFM that is the restrictive and archaic component, hence my recommendation for a MAF
Switching to an MAF from the ancient barndoor AFM is a big improvement on throttle response. It also helps with efficiency,
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  #7  
Old 05-08-2016, 07:57 PM
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sixpot_simon sixpot_simon is offline
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Originally Posted by markseven View Post
IMO the stock airbox flows / filters well and is probably better than any aftermarket CAI. It's the AFM that is the restrictive and archaic component, hence my recommendation for a MAF
Ahhh, cool.

Here's some test results relating to the intake which I found interesting: http://www.r3vlimited.com/board/show...11&postcount=6

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Originally Posted by M-technik-3 View Post
Switching to an MAF from the ancient barndoor AFM is a big improvement on throttle response. It also helps with efficiency,
Amen! I noticed the throttle felt a lot nicer on an M30 after the MAF conversion. Hard to describe the difference, but definitely better
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Old 05-09-2016, 10:26 AM
markseven markseven is offline
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Ahhh, cool.

Here's some test results relating to the intake which I found interesting: http://www.r3vlimited.com/board/show...11&postcount=6
I didn't read through the whole thread so I am not sure if heat soak is addressed. IMO any gains from non-shielded "CAI" are eventually negated by engine bay heat. I prefer the cooler, more dense charge of a exterior snorkeled and protected airbox. Just my $.02.

In addition, the tests that Miller did were on a Mustang dyno which were at one point in time very optimistic. Just sayin.
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  #9  
Old 05-09-2016, 05:23 PM
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sixpot_simon sixpot_simon is offline
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In that case it was a foglight intake, so heat soak shouldn't be an issue

Quote:
Originally Posted by markseven View Post
In addition, the tests that Miller did were on a Mustang dyno which were at one point in time very optimistic. Just sayin.
Yep! Although I don't think a high-reading dyno matters for comparison testing.
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  #10  
Old 05-09-2016, 06:22 PM
markseven markseven is offline
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In that case it was a foglight intake, so heat soak shouldn't be an issue
Okay, gotcha. Where was the filter placed?

Not trying to knock down everything you are putting up, I think you have presented a good case for non-OE air filtration, so please take this as anecdotal commentary:

Back in my E39 days there was a guy here on Bimmerfest that had an intake at spoiler level. One day he drove through a puddle that was deeper than expected and sucked up a gallon or so of water into the top end of his engine. Ouch.

Quote:
Originally Posted by sixpot_simon View Post
Yep! Although I don't think a high-reading dyno matters for comparison testing.
Agreed. The point I was trying to make was that the increase in WHP was probably less than what the Dyno read, maybe negligible?
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  #11  
Old 05-10-2016, 02:18 AM
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sixpot_simon sixpot_simon is offline
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No worries at all, I enjoy trying to get to the bottom of this stuff (sorry for hijacking your thread, leukis).

Yeah, hydro-locking definitely needs to be considered with low intakes. I'm not strongly pro or against replacing the factory airbox, I guess my point is that I'm sceptical that switching to 6 throttle bodies could provide a meaningful increase in power, because those test results suggest that the restriction is elsewhere in the intake system (AFM/airbox/etc).
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Last edited by sixpot_simon; 05-10-2016 at 02:19 AM.
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  #12  
Old 05-18-2016, 07:07 AM
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I would only consider multi TB's if I was going to change the camshafts as well as tune the EFI system
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