Dumb Question Thread - No Flaming Allowed

[bavarian3]

What is the exhaust manifold stud torque spec? Was contemplating the extended N54 bolts, but couldn’t find the torque setting in that giant torque spec PDF.

Good and tight should do for the nuts you can't get to with a torque wrench.

[Barracooda]

What's the purpose of this smooth hole machined into the head? There's one at the front and rear, only thing I can think of is maybe they use it to lift the engines during assembly?

[Barracooda]

I've got another dumb question, where the heck does this splash guard / shroud thing go? It's got a part number on it, 51717895092, which I haven't been able to find in any of the diagrams or for sale. I took it off at some point while refreshing the cooling system and never could find the proper place for it upon reassembly.

It somewhat fits around the oil cooler, but didn't seem quite right. I've watched every video I can think of and haven't seen it. The part number is only 1 digit off from the big belly pan / splash guard (51717895091).

[jayjaya29]

I've got another dumb question, where the heck does this splash guard / shroud thing go? It's got a part number on it, 51717895092, which I haven't been able to find in any of the diagrams or for sale. I took it off at some point while refreshing the cooling system and never could find the proper place for it upon reassembly.

It somewhat fits around the oil cooler, but didn't seem quite right. I've watched every video I can think of and haven't seen it. The part number is only 1 digit off from the big belly pan / splash guard (51717895091).

This looks like the insert piece on the main splash panel, see pics here:

https://www.turnermotorsport.com/p-21177-51717895091-genuine-bmw-part/

[Barracooda]

This looks like the insert piece on the main splash panel, see pics here:

https://www.turnermotorsport.com/p-2...uine-bmw-part/

Thank you, those pictures help a ton. I didn't realize I needed to have this piece inserted into the main splash pan on assembly, makes perfect sense now.

[Cubieman]

I thought those two pieces were glued/"welded" together no?

[jayjaya29]

I thought those two pieces were glued/"welded" together no?

Its supposed to be but looks like the friction welds have failed and the panel separated.

[E46 M3]

Damn it I'm back to 2nd crank starts, solved it by buying the Hella branded fuel pump 3 years ago so I figured I'd buy another one but it's doubled in price since then lol.

[Barracooda]

Its supposed to be but looks like the friction welds have failed and the panel separated.

So that's what the rough circles are around the edges, it's where it used to be attached. This makes sense, my splash pan is a little beat up, and it explains why I couldn't find that part separately.

[fattycharged]

do i really need to run the O2's post SS sec1 cats?

TIA


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[Tbonem3]

do i really need to run the O2's post SS sec1 cats?

TIA


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No, no car needs rear o2s except to complete the emissions drivecycles for smog inspection.

FWIW, the SS HJS catted sect 1 does pass CA SMOG. I leave my rear o2s in and leave the pipes in, just swap the airbox.

[fattycharged]

No, no car needs rear o2s except to complete the emissions drivecycles for smog inspection.

FWIW, the SS HJS catted sect 1 does pass CA SMOG. I leave my rear o2s in and leave the pipes in, just swap the airbox.

I'm debating bringing it out to CA, or the E36, not sure which I would prefer to have as a fun weekend car now that I'm living down in SD 3 days a week


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[Tbonem3]

Both are perfect for the canyon roads out here

[bavarian3]

No, no car needs rear o2s except to complete the emissions drivecycles for smog inspection.

FWIW, the SS HJS catted sect 1 does pass CA SMOG. I leave my rear o2s in and leave the pipes in, just swap the airbox.

People get big mad at me for this but i pass smog just fine with rear o2's and egt deleted. They are not needed even for the drive cycle.

[Tbonem3]

People get big mad at me for this but i pass smog just fine with rear o2's and egt deleted. They are not needed even for the drive cycle.

EGT became irrelevant after a software update; it's not needed to pass (I turned mine off) Similar to EVAP.

But rear cat o2s are definitely needed for drive cycles - not sure how you could think they're not - what else is determining cat efficiency?

I would guess that your particular software got set as completed with your last tune. As soon as you disconnect the battery or clear a CEL, the drive cycles would get cleared. Or maybe your particular tune has forced the cat monitors to go green.