E30 M3 Throttle Housing Assembly Throttle screws

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M3Tarmac
E30 Zone Newbie
E30 Zone Newbie
Posts: 9
Joined: Tue Aug 24, 2021 1:37 pm
Location: Hampshire

Post Wed Oct 20, 2021 9:45 pm

Hi All,

Anyone able to shed light on the Throttle screws on each throttle body / intake on the E30 M3 S14 engine? Part # 13541402567.
1988 E30 M3
M3Tarmac
E30 Zone Newbie
E30 Zone Newbie
Posts: 9
Joined: Tue Aug 24, 2021 1:37 pm
Location: Hampshire

Post Sat Oct 23, 2021 4:35 pm

They seem redundant but are maybe used for tuning the engine?
Any hints gladly received as the car is nearing return to the road and I want to set the engine up as best as possible.
1988 E30 M3
M3Tarmac
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E30 Zone Newbie
Posts: 9
Joined: Tue Aug 24, 2021 1:37 pm
Location: Hampshire

Post Sat Oct 23, 2021 4:54 pm

Photo of the screws in question
Throttle Screws PN 13541402567.jpg
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1988 E30 M3
kundiboy
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Joined: Thu May 04, 2006 11:00 pm

Post Sat Oct 30, 2021 12:41 pm

Those screws are used to balance the individual throttle bodies. If you do a search for balancing ITBs on S14.net there is plenty of info on how to set them.
Image

1988 Diamond Schwartz E30 M3
M3Tarmac
E30 Zone Newbie
E30 Zone Newbie
Posts: 9
Joined: Tue Aug 24, 2021 1:37 pm
Location: Hampshire

Post Sat Oct 30, 2021 12:45 pm

Thanks kundiboy.
Any tips on the similar 4 bolts on top of the exhaust manifold primaries? I gather they are for measuring CO / CO2 but no more info.
1988 E30 M3