e36 m3 itb's. i had a spare m42 head so could work out where everything had to go without taking the inlet off my car. i removed the centre pair of throttle bodies and used the 2 outside pairs, cut down the throttle linkage and fuel rail then had to have 2 pieces of aluminium welded to the bodies where the studs didn't line up. the ports matched great but the studs needed re drilling. i used the m3 tps and injectors and the engine started ok without the air flow meter but was too rough to drive
https://youtu.be/JkjyEIHgQLE
the trumpets were made from exhaust tube and egg cup holders (very low budget)
i didn't want to run the restrictive afm so i made a loom and fitted a DTA ecu. once mapped it ran really well, it sounded lovely but didn't make much more power than standard. it was fun to do and cost very little apart from the ecu. the biggest gain was in the sound it made, it sounded like 200 bhp
i will post pictures when i can work out how to make them smaller
Hi
Sounds like a bit of fun, but you wouldn't have the air velocity for this to work properly.
Couple of things that would help are 34 mm inlet valves same as s50 and larger individual cylinder volume ie stroker. Also note that s50 itbs where designed to be effective at a very high rpm, hardly that useable on the street. You look like you have extended the trumpets though.
Another thing to consider is valve size to itb size or more accurately areas
E30 m3 2*37 mm to 46 mm trumpet
E36 m3 2*34 mm to 48 mm trumpet
Can you see what's a bit off? I'm still trying figure that out.
I think they used the 6 cylinders timing to bounce shock waves from one trumpet to another.
Cheers Rohan
