m30b35 Backyard budget ITB's

[paynemw]

This picture is dope! I think I did some dealing with you on the NC E30 Facebook Group.



I'd love to go to a late model big six or ITBs. I support your project!

[mzollo]

This picture is dope! I think I did some dealing with you on the NC E30 Facebook Group.



I'd love to go to a late model big six or ITBs. I support your project!

thank you! took 45 seconds and i was outta there

but most likely, I am an admin of that page and a member since 2012 :)

[mzollo]

Just some ideas of how close the port is to the throttle body itself there is room to extrude here- although the machining is so clean I don’t even want to try- if I do I’ll probably just try to round the bottom flat edge a bit deeper.
And yes I’m going to make a plug for the old injector bosses. I will have access to a 3D printer so I’ll probably design a plug that will fill the hole flush to the bore.

[mzollo]

Another extremely crude measurement- I wanted to get an idea of the runner length, and yes supposed to measure valve stem to end of runner but I don’t have a head to look at for the moment so take this with a grain of salt. Or 5.

Around the outside I get 14 inches, through the center I get about 12, and around the inside I get about 10. So given that let’s call it 12 to the head. Without a velocity stack, not factoring the inch behind the butterfly and the inch or so in the head. Plugging in cam numbers and other little bits into some calculators tuning for the 4 resonance pulse around 5-6000 rpm (I tried it a few times) come up with similar dimensions- so I might not be too far off the ball here.





I’ll be able to actually figure this once it’s running after the AFRS are dialed in and it runs smoothly. The fuel table In 3D should show some destive peaks that should* give me an idea of where and when these pulses are having an affect.
Here is a 3GSE fuel table for example




I’m pretty clueless on the subject- but have been reading some chapters of some books and various threads trying to gather information. Would love to
Hear input from someone that knows what they are talking about

[E30335i]

Oh man, I want to do this after I settle my million projects down. M30 itbs, maybe a cam will def put the car near s52 power but with character!


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[e30m3s54turbo]

Sub'd.....

[digger]

id have the length adjustable using different bell mouths that bolt on. 11" (length from head mounting face to radius of entry) is absolute shortest you'd probably want on an m30 with ported head and decent cam and the m30 might like 3" more than that for the better midrange. short runners is absolute worst thing you can do but you seem to be on the right track. i thought about trying to use those runner sections on an m20 once to try and get something that was as long as OE but using the RHD throttles

[mzollo]

Thanks for the input! So there’s gonna be another 2-3 inch worth of velocity stack that will be on top of the throttles and once I have access to that printer I may be able to print some out to test, also I’ve gathered some info on e21 intake tubes and they appear to be the same diameter but slightly longer with the same bolt pattern- so I’d like to grab a set of those for comparison. Was digging through some old e9 forums and stumbled across it

[mzollo]

Also since these do bend over the motor I could get away with some obnoxiously large runners for the sake of science 😂

[mzollo]

I had forgot to add this in the first post- but an idea of how it’s gonna look, I wish I had the stacks at this point

[wworm]

Oh man, I want to do this after I settle my million projects down. M30 itbs, maybe a cam will def put the car near s52 power but with character!

I doubt it but I think with the extra displacement youd get a bit more low end..and about a million more style points. M30's are so damn cool.

this is going to be sweet. Will op be running open stacks or an airbox setup?

[E30335i]

I doubt it but I think with the extra displacement youd get a bit more low end..and about a million more style points. M30's are so damn cool.

this is going to be sweet. Will op be running open stacks or an airbox setup?

Of course it will. S52 is 240/200 and m30 is 208/225. The “bmw figures” show the torque is already there.


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[digger]

Of course it will. S52 is 240/200 and m30 is 208/225. The “bmw figures” show the torque is already there.


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S52 is 240/236

M30 likes a bit of compression and a proper tune

[mzollo]

I doubt it but I think with the extra displacement youd get a bit more low end..and about a million more style points. M30's are so damn cool.

this is going to be sweet. Will op be running open stacks or an airbox setup?

Yes the motor is gonna need a cam and some head work, and some compression to really make some power, it’s all baby steps. And as far as an airbox I plan to build one using foam core to mold fiberglass/carbon.

I’m making some big life changes here and moving to Dallas Texas in about 6 weeks to start a new job in the Aviation field. So the project is going to get put on hold inevitably but for the time being I’m trying to make progress before I leave. I’m hoping to have the car running on MS2 this week, my adapters are being drawn up and cut this week as well, so there’s still a lot to do but should be pretty straightforward from here out

[mzollo]

cant get the youtube embed to work- but heres a big ol 2nd and 3rd gear burnout During the e30CCA Oktoberfest. drove 1500 miles round trip from NY to NC did two days worth of abuse and made it home, after that im fairly confident in this brick... https://youtu.be/GpToHdqOzeE