Racing AERO

[Reub_e30]

Very cool! Did you happen to see any specs on that thing? I wana read the build sheet

Couldnt find anything. There was only one random pic

[Brezzi]

It looks like most of these are just bolted to the bottom of a lip valence and subframe or skid plate in the rear? No adjustability? If I were to do a splitter on an e30, I would build it from alumalite and bolt it to a small 1" square tube frame that bolted to the frame rails with slots to allow some adjustment... I am definitely nowhere near the point of wanting or needing aero, and I think a lot of people go there before properly setting up their car or learning how to drive it.

100%

I admittedly just like aero b/c its functional "styling"

[Jb325is]

It looks like most of these are just bolted to the bottom of a lip valence and subframe or skid plate in the rear? No adjustability? If I were to do a splitter on an e30, I would build it from alumalite and bolt it to a small 1" square tube frame that bolted to the frame rails with slots to allow some adjustment... I am definitely nowhere near the point of wanting or needing aero, and I think a lot of people go there before properly setting up their car or learning how to drive it.

[Brezzi]

Have to post this pic I saw on SpeedHunters from the Gatebil event. Major aero action going on!

Very cool! Did you happen to see any specs on that thing? I wana read the build sheet

[Reub_e30]

Have to post this pic I saw on SpeedHunters from the Gatebil event. Major aero action going on!

[natealb892]

you could make a fiberglass bellypan for pretty cheap but most people use aluminum for its strength properties. Composites tend to shatter where as aluminum will absorb most of the energy of something that would otherwise destroy your oilpan. If it's strictly a track car I would go with a composite under tray to reduce drag, I don't see it being worth trying to make an entire under tray to try to get downforce, it would be outrageously expensive IMO.

[e30_302]

A lot of people use aluminum sheet or alumalite.

[Brezzi]

It could help drag, certainly. You really don't get into making downforce with just a flat bottom, though. You would definitely need to keep the exhaust open, and you'll also potentially run into problems with trans and diff temps. I don't think I'd want something flammable like plywood or plastic either.

very good point - it'd prob have to be carbon? which would jack the price way up for not that much pay off.

[e30_302]

It could help drag, certainly. You really don't get into making downforce with just a flat bottom, though. You would definitely need to keep the exhaust open, and you'll also potentially run into problems with trans and diff temps. I don't think I'd want something flammable like plywood or plastic either.

[Brezzi]

could you mount a piece of plywood or ABS or something beneath to make the bottom flat? That was always something I thought of for the e30. Maybe split it based on where the exhaust falls? Would that render the flattening of the underside completely useless? Or just make it a little less effective?

edit: I know why does a guy with a vert want to talk areo haha

[e30_302]

Lack of interest, less of a return compared to front and rear aero. I'm not sure how much side skirts are going to do on a car without a flat bottom and not making downforce from the underbody. We're making downforce (or at least less lift) on the exterior body mainly. But like I said, some garden edging and some rivits and it's done, so stay tuned.

[Digitalwave]

Far from it, ideal would be a straight vertical wall. I plan on adding some garden edging for a side skirt whenever I get around to it.

Any theory why most of the cars pictured in this thread have got to great lengths for front and rear aero but haven't even put on a simple side skirt?

[e30_302]

Far from it, ideal would be a straight vertical wall. I plan on adding some garden edging for a side skirt whenever I get around to it.

[Digitalwave]

I notice that most aggressive aero E30's don't run any side skirt. Is our curved rocker panel ideal?

[autox320]

^^ Wow any videos of this car in action? Would love to hear that s14 scream. What kind of power figures are you making?

No dyno's or power figures just road tuned AlphaN. If had to guess a mild street build like this has made about 280hp flywheel. But torque is excellent for a 4pot.
I just started back with NASA in 2014 when finished the motor. Messed with cam timing over the years to find what it likes. Trying the all ducted front this year soon and tweaked the cam timing once again. This is a street car build S14 with goals for torque and 93 pump gas. Topend runs stock valves and schrick 292/284. Suspension setup is close to specE30 with additional bracing.
build is on S14power.com

https://www.youtube.com/channel/UCjXrbIjeFI8a0WYc1d12Mgg/videos?shelf_id=0&view=0&sort=dd