ITB's info/projects

[nuvolarossa]

link works fine, nice job! Can't wait to hear them screaming at full throttle

[dwtaylorpdx]

Typically a ITB setup will add throttle response and top end power. Given the same diameter air path a ITB and a Single TB are similar in the mid RPM range. Most I've driven add awesome initial throttle then it smooths out but with a good cam at about 4500 watch out !

Dave

[El-Kanal]

Did anybody try using Slide Throttles, as they did on the S14s?

http://www.e30m3project.com/e30m3performance/tech_articles/engine-tech/dtm_slides/index.htm

By todays CNC machines it shouldn't be to hard to have a set made, but is the thorttle response really that bad?

[dwtaylorpdx]

Couple things I have not seen mentioned, but thought I'd point out/see what others thought.

First, if you have variable valve timing, the intake runner length should become a much less important variable. Its why the S2000 just uses a honking big intake, and why Honda's in particular respond so well to exhaust and improved intake packages.

Second, back when we all ran side draft Webbers at the track, the manifolds had vacuum logs on them. It was a 1/2 to 3/4" dia pipe that connected the runners below the throttle plates. With the carbs it was to make them less balance sensitive, but we also tapped any needed vacuum off of them. I wonder is a log with check valves would help balance the vacuum signal off the throttle bodies so you could centralize a vacuum signal?

Thoughts?

Dave

[boldrix]

hi,somebody have good picture of s50b30 ITBs on m42

[4banger]

what about dual tb's? say 1 for cly 1&3 and 1 for 4&2 ?

[El-Kanal]

That's what I'm doing right now to my E36, I'm keeping the DISA flap, and fiting an Ford double throttle body, need to sort out the Vacuums...

[Redpolack]

would you have some videos if the car running?

[Longerr]

Hi, guys, am working on Lotus 7 project with m42 engine. Last year I was using engine from 318ti and it worked pretty well but than I have destoyed it, this year I'm using engine from 318is with Dbilas ITB and a lighter fly wheel, the problem I have with this engine is that it runs much worse than the stock engine from 318ti, above 5.800rpm it goes very good but untill that its worse than stock. My idea is that the desing of the "air box" of dbilas itb is not good. Otherwise I really dont know where can be the problem. Any suggestions? It would help me a lot, thx

http://picasaweb.google.com/Longerr82/Lotus7V20#5465121528593512146

[max123]

Out of curiosity has anyone dyno'd a dbilas ITB setup with no other mods.  They don't state any increases and I just wanted to find out what the real world advantages are.  Or, is it only a mod that becomes worthwhile once the engine internals have been modified and you are singing up at 8,000rpm

[Warsteiner]

10.010.005
318is E30
1,8 16V 100kW
M42B18
14/19 KW/HP
inkl. Chip
1453.09
 Direct from their website. 19HP gain inclusive of chip.

You should always re-tune when optimizing your change and they did because they have a chip with the package.

Better throttle response and more power are great attributes to ITB's!

It's hard to say what the HP increase would be unless you dyno before and after the mod on a built motor because changing to higher compression can do wonders all by itself. Even with my built motor I won't be seeing 8K rpm but probably 7,500 rpm for longevity and saftey.

I won't be able to give dyno numbers with ITB's on a stock motor but maybe deekay:D can if he is willing to spend the money on a dyno? I will be dynoing my car that has the stroker with ITB's and MSII.

Cheers,
~Ralph

[deekay]

i'd like to get my wideband in before i do.

if i get a wild hair up my ass i MAY put stock manifold and stock chip back in for a baseline, but i'm not making any promises, and i have to head to another army training session in july. but we'll see if i can make it happen before then.

[Janne]

Here is my e36 m42 with Dbilas itb and chip: http://s303.photobucket.com/albums/nn158/Janne87/Itb/

Throttle response increased very much with itb. :cool:

[thedguy]

I have some questions about ITB's to disscus with you guys here ....

shorter runners are good for high rpms and longer for low -mid rpms we all ready know why ....

3. Why metric mechanic in camber pulse intake make tha tube so sort ?it wasnt better if the make them longer ? or make more distance from the intake valve ?

When I spoke to MM about these in person Jim was setting them up mostly for high rpm power.  Back in his oval track days he said he put them on headers as well as the intake sides.  They made it very hard to feel where the engine ran out of power and had a problem with drivers blowing up engines.

[xsjado]

saw this on r3v...m42 itb...anyone know details of this car?look really badass!!

http://r3vlimited.com/board/showthread.php?t=176182


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