An interesting ITB setup for M30B34 and M30B35 engines

[rblongboarder]

You've probably seen my posts in other areas of the forum.. asking questions about the M30B34 / M30B35 motor with Megasquirt EFI..

I didn't realize there could be four options for the fuel / air mixture, but then I thought about the individual velocity stacks on my friend's Pantera V8 motor, and it seemed to make sense to me.

• Option 1: Carb. Carburator feeds multiple cylinders
• Option 2: Carb. Each Carb feeds a single cylinder - ex: Weber DCOE side drafts
• Option 3: EFI. One injector per cylinder, single throttle body
• Option 4: EFI. One injector per cylinder, with individual throttle bodies (ITB).

Option 4 was new to me.. but I found this company I thought it'd provoke an interesting discussion:

BMW M30 - Individual Throttle Body Kit (ITB) Intake [FOR BMW E9, E24, E28]

Individual Throttle Body Intake Kit for BMW M30 Engines. Fits BMW E9, E12, E23, E24, E28, E32, E34 Performance Complete Bolt-On ITB Kit. Get the look, sound, response and performance gains that ITB's have to offer. Expected performance increase of +30-40hp over OEM intake Fits both LHD & RHD...

reduxracing.com

Lower intake manifolds with EFI ports, merged with ITB velocity stacks. interesting combination.

I assume the ECU controlling this setup only pays attention to throttle and RPM. But they offer an add-on air intake, You could install air temp and AFM sensors on these...

BMW M42 / 44 - TURBO INTAKES - CARBON FIBER [FOR BMW E30, E36, Z3]

Carbon Fiber Intake Manifold for BMW M42 / 44 Designed for both N/A & Boosted Applications LIGHT. STRONG. GOOD LOOKING. FREE FLOWING. Fits BMW E30, E36 & Z3 BMW 318i, 318is Engineered by RHD Engineering Unleash the full potential of your BMW with our new Carbon Fiber Intakes a...

reduxracing.com

BMW M20 - ADAPTER ITB CONVERSION PACKAGE [FOR BMW E28, E30, E34]

INDIVIDUAL THROTTLE BODY CONVERSION PACKAGE FOR BMW M20 ENGINES Includes everything you need to upgrade your car. PERFORMANCE Get the look, sound, response and performance gains that ITB's have to offer. Upgrade your old tired system to the latest technology for better reliability, power and...

reduxracing.com

 

[StephenZ]

Yeah, there are some good youtube vids on the ITBs. If I had FI, I'd go that route. I believe you rely on throttle position and maybe a vacuum dist block to be able to average out vacuum for a MAP sensor..plus brakes, unless you go boosterless.

 

[Larry Louton]

Hello, There is a company in England that makes a throttle body sized the same as the Weber 36-36 right down to throttle linkages and stock air filter. If you have a relatively stock engine with mild compression increase and somewhat larger cam, This could be another way to go. Webcon Retrojet.

Larry Louton

 

[e30strube]

That's the setup on my car. RHD makes the kits and Redux is the company that sells them here in the states.