Das Beast: My E30 track / street build

[dvallis]

I started larger so we can cut it down as required. Might end up smaller. I'm still researching.

Professional Awesome distributes Racebred splitters. They look fairly decorative. No tunnels or front supports from what I found. Anyway, I like building things : - )

[Digitalwave]

Is the outer profile just roughed out for now or is it really going to be that large? It looks much too large for the wing you're running.

Professional Awesome makes some preformed plastic splitter tunnels if you want to save some effort, they are relatively inexpensive.

[dvallis]

I like the overall shape so we're going with it



At the proper height. Needs a 2" air dam. Will fab it from lawn edging or something



This is bad. Splitter hitting oil pan



3.7 degree up angle, i.e. lift generator. Definitely don't want that.



Slight surgery to remove the offending piece



Good clearance now



0.28 down angle, same as garage floor



Frame is starting to shape up like this. Not totally sure what the final product will be, but it's getting there





There's room to make the tunnels 6" wider on each side. Would need different mounting points. I'm considering doing it.

[dvallis]

Yes. Going to fab them from 0.060" aluminum. We're out of sheet stock though. Metal shop opens Monday : - / Lowes only has 0.025" which is like tinfoil.

[moatilliatta]

Are you building your own splitter tunnels?

[dvallis]

Splitterama

Started with 1/2" oak plywood



Cut the sheet to 72x36 and started adding cutouts



Measured for fit to the IS valence. I had it upside down last time. Nobody noticed LoL



Planning the tunnels. Tire profile is black cross hatch bottom left



And finally done this phase. Good progress for an afternoon

[dvallis]

LoL. No aero penalties in NASA ST1/2/3. I can hang aero bits all over this thing. My crew chief just frowns and mutters "Drive faster ..."

[ForcedFirebird]

Diffuser is only 10 points in some racing classes. :p

[dvallis]

Tunnels make a big difference. See below, with and without. More blue, more downforce

[moatilliatta]

I like the splitter tunnels. :)

[dvallis]

Splitter CAD V2. Much better

[dvallis]

Friend of mine was lucky enough to have VIP access at the Reb Bull Racing UK facility. After researching splitter design all week, it's easy to see how these work now. Our splitters sit under the front of the car, theirs hang out in the breeze in front of it.



Lots of side aero going on as well.

[Digitalwave]

Looking good. I bet if you pick Johnny @ Nine Lives brain, he'd be glad to help out with the splitter design.

[dvallis]

Beginnings of a splitter. Rough dimensions, locations of supports etc. Tunnels are cross hatched. We'll use this to CAD a template with better symmetry. It's a start.

[dvallis]

Finally updated the diffuser to cover the full width of the car. Been wanting to do that for some time. Looks way better.






Also changed to lighter weight oil. We were running Molly 10W60 since I had it around for the E39 M5 but it's WAY too heavy. Oil pressure was 60 psi hot idle, 70 psi WOT. Switched to 30SAE VR1. Now we're 20 psi hot idle, 40 psi in turns, 60 psi WOT. Perfect