The Cobra Adventure

[Waitey]

GCCP said:

E46 m3 come with a 3.62 as standard - they come up all the time on M3cutters. Might be a good inbetween option? assuming you have the big 210 diff?

I'm on a medium case. I did look at swapping to the large case, but with how somethings are engineered on the Cobra, it would have clearance issues.

[Waitey]

Switched from Fusion360 to OnShape. Far nicer to use.

Made some flanges for the manifold to downpipe joints. They are currently slip joints and they leak like hell.

Will get them laser cut by Fractory.

[Tom4398cc]

I’m in awe of this thread, most of it well beyond my comprehension. But I just wanted to pipe up to say I did chuckle at the photo of the diff, soft hammer and G&T.

[Waitey]

Tom4398cc said:

I’m in awe of this thread, most of it well beyond my comprehension. But I just wanted to pipe up to say I did chuckle at the photo of the diff, soft hammer and G&T.

I've found getting slightly pissed for the most complicated task is the best way!

[Waitey]

After building my diff up, it felt far too tight. I was hoping to just get away with the core swap, but that wasn't to be!

So I had a look at an old thread about building an E36 track car where the OP rebuilt the diff. So I reached out to him and bought some diff shims from him.

You use the shims to adjust the drag when the diff is fitted. Looking for between 11-23in/lbs of drag. A wider shim = less drag.

Had a fun night of measuring all the shims he sent.



Diff stripped back down and the original shims measured. I had a 1.48 and a 1.69 in it.



Then it was a case of trying different combos till the drag measured right. I had to use this park tool for bicycles to measure that low in in/lbs!

Final shim stack was, 1.59 and 1.79. Gaining 0.21mm.



After that, the diff could be built back up again. Which requite lightly grilling the crown wheel. Crown bolts torqued to 120lb/ft with loctite.





Put it back together and measured the backlash. All on spec at 0.08mm. Case back together and filled with Kaaz LSD oil.

Edited by Waitey on Sunday 7th April 15:29

[Waitey]

PMC Motorsport you've outdone yourself.

Adjustable top and bottom camber arms





Then even nailed the blue.

Blue because I'm a red white and blue tart with this thing.

[Waitey]

Waitey said:

Switched from Fusion360 to OnShape. Far nicer to use.

Made some flanges for the manifold to downpipe joints. They are currently slip joints and they leak like hell.

Will get them laser cut by Fractory.

My thing became a real thing!

Well impressed!

[leglessAlex]

I feel that way every time something comes off the 3D printer or arrives from Protolabs, I get mega excited that my digital thing is now a real thing

This thread is absolutely ace. Curious about the revopoint scanner too, I’ve got the Pop2 and not enormously happy with it. I like the look of the dry shampoo trick, however. Almost certainly cheaper than the AESUB spray I’m currrently using.