Project Megasquirt Link

rblongboarder · 2026-08-29T03:17:18-0400

I've been reading some of the older posts, learning about c-tubes, megasquirt, crank & cam sensors and a whole lot more...

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Thread 'What's the best 3.5L block + head combo?'

Sep 26, 2006

I've heard of people swapping different cylinder heads onto 3.5L blocks (not sure if it's the euro 3.5L or m30b35) to increase the air flow (more HP) and also cure overheating issues. Can someone explain this to me?

Also, what diameter piping headers is best for a basically stock 3.5L w/ a sport cam? 1 3/8"?

Thanks in advance.

Thread 'bmw m90 questions'

Feb 28, 2022

wondering a couple things about the m90

according to previous threads regarding pre 82 m30 heads have a higher chance of cracking due, does this include the pre 82 m90 heads or were they fixed ?
,head gasket part number in the usa? will a s38b35 head gasket work ?
can motronic 1.3 out of a b35 run an m90 even though compression is a bit higher? i do know about the hardware involved in converting just wondering if that stock tube would work well with the higher comp

what wheel horsepower numbers could one expect from a m90 port matched with short tube ie headers, lightweight flywheel...

Thread 'The big C-tubes on the dyno'

Mar 24, 2021

Love the torque.

Thread 'M30 DYNO numbers 2.8, 3.0, 3.3, 3.5, 3.8....'

Jul 4, 2016

How many members have had their motor dynoed? Actual numbers only please, chart if you have it. Curious as to the HP and RPM limits from across the spectrum, 2.8, 3.0, 3.3, 3.5, 3.8 and what type of injection whether carbureted (side or downdraft, what size jets etc.), Motronic, L-jet, K-jet, etc.

Anyone run a lower compression w/ turbo? When is too much, too much, how long did motor last at higher limits? Any and all feedback welcome. Happy 4th and thanks for participating!

GB

This is a very clever trick.. retrofitting an older M30B30 upper timing cover & distributor gear onto a M90:

Post in thread 'bmw m90 questions'

Mar 6, 2022

HBChris: We thought the same thing re. the red paint when we first saw it, but we decided to leave it as is, not least of which reason being that the ITB’s will . The block is ‘79 / head ‘86 / w/ larger ports and the water jacket.

As for Motronic, the reason it’s set up that way currently is because that was the only option available when we got the cam. However, Don pointed out that with the help of a special nut he has, that it can be converted to a distributor. Long story short we can have it either way. Once it’s back from upholstery we’ll jump back in to the engine bay...

I found this site while doing searches for M30B35 engines. Lots of useful details and photos.

Project MegaSquirt – BMW M30B35 engine - MVWautomotive

The MegaSquirt BMW project:Due to my special interest in the software and hardware of the MegaSquirt ECU and all related components, I decided in October 2018 to prepare another engine. The following goals were set: The engine will be mounted on a frame; so it will not be installed in a vehicle...

www.mvwautomotive.com