1997 m3 sedan with s54 swap

[3staxontheradio]

JBanzhaf Grabbed me this screenshot from ISTA. Hopefully the next person googling for this can find it. Pretension to 170nm, back off, torque to 120nm

[3staxontheradio]

Intake prototype parts for section 1 and section 2. This feeds my AFE intake nicely. The plan is to have section 3 be CSL box specific. The print failed near the top but still usable to test fitting. It was never going to be an end use part since its just printed in petg-gf

One challenge I need to solve: The engine will move and there isn't a ton of ability for all of this to flex. I'm trying to figure out the best way to get some flexibility into the design without having to resort to anything that flows really badly like a corrugated hose. Open to a few ideas including wrapping and forming a custom shaped silicone hose/coupler, making longer slip fit joints between each piece, and keeping the middle section printed or made out of something with more ability to deform (polypropylene is a bitch to print but would work).

[heinzboehmer]

One challenge I need to solve: The engine will move and there isn't a ton of ability for all of this to flex. I'm trying to figure out the best way to get some flexibility into the design without having to resort to anything that flows really badly like a corrugated hose. Open to a few ideas including wrapping and forming a custom shaped silicone hose/coupler, making longer slip fit joints between each piece, and keeping the middle section printed or made out of something with more ability to deform (polypropylene is a bitch to print but would work).

The newer, "high flow" TPU filaments are fairly easy to print. I've tried a couple softish ones (~90A) and they were all easy to work with. I've also printed things out of this stuff, which was significantly more of a pain: https://recreus.com/en-en/products/filaflex-60a

Required messing with the extruder tension and feeding the filament directly into the extruder (even with a PTFE tube, the friction was too high). But, once set up, it does print out fairly well and is extremely flexible. Not sure you need that much flex for this piece, but it's an option.

[3staxontheradio]

My main hesitation with TPU is that the thermal performance isn't great. I haven't looked into them that hard though so maybe I am just ignorant on them.

[3staxontheradio]

Looking at the data sheet for that one: what am I really looking for as a standard to use? It's by definition soft so that's not an issue. Is there a standard out there for measuring plastic deformation creep?

[heinzboehmer]

Looking at the data sheet for that one: what am I really looking for as a standard to use? It's by definition soft so that's not an issue. Is there a standard out there for measuring plastic deformation creep?

I don't actually know the answer to that. Maybe you could go off the melting temperature (and add some margin)?

[3staxontheradio]

I'll do some research. I think when I briefly looked at TPU for this a while back I saw low heat deflection temps and didnt really stop to think about what that means with something intentionally soft. I have a qidi plus4 which should do well with the 95a tpu