calZ

People still care, I just see it here and on Instagram. The forum is really nice as far as documentation and being searchable though. Please keep posting here

Why the decision to go with 3 pieces rather than 2 per side? Worried about getting it to conform?

Looks good to me. I think rather than a slot, I'd go with overlapping holes like in this picture. It would make replicating setups and matching the left and right mounts a lot easier than with the slots.

I don't see a picture of you meant to post one

@tube80z Here's a bot for you to ban

Presumably use it as a stand-in for the VSS signal in vehicles that don't have it.

The DPS system uses the potentiometer to control the assist. The Silvermine kit adjusts the assist based on your speed.

They're generally pretty respected in the community. I've never heard of them not delivering, so I wouldn't be too worried about it not getting there eventually. Probably worth another call or email though.

You're exactly correct on the pressures. Each individual control volume effectively cancels out

I'd put the use of manometers above the capability of your average car builder, but fair enough.

RBs and LS engines are the most common swaps, but some people use Nissan VQs as well. Apex Engineered offers a front subframe with mounts for your choice of L, JZ, LS, RB, and VQ engines. The VQ would let you put a CD00A behind it if you wanted a brand new trans. https://www.apexengineered.com/store/p7/Front_Crossmember.html If you want to stay with an L-series, Datsun works (sold through Godzilla Raceworks) offers kits to put either a CD00A or TL70 (BR-Z trans) behind them. Both brand new, more modern options. https://www.godzillaraceworks.com/drivetrain

The flap will add a drag component, but the hope is that the added suction on the vent outweighs it. Hard to tell without testing or simulations though. Agreed on it just being guessing, though. That's what a huge amount of the amateur racecar aero you see is. Very few people have the knowledge or resources to properly test small changes like that. Wings and airdams are easy to measure, but smaller features get hard to isolate and measure.

You work fast. Looks great.

A Gurney flap creates suction on its rear side. The flow doesn't have to be perfect, and you aren't getting laminar flow anywhere on a car. Look at basically any racecar with a radiator ducted to the hood. There's a Gurney flap to increase the suction in its wake. Flow isn't binary. It isn't clean or dirty, and pressure isn't just high or low. There's varying degrees to all of it. The smoke in the Ecoboost picture you posted is still flowing through that area, even if it's a little messy. The more you vent out the top and rear of the wheel well, the cleaner the flow will be alongside it because there won't be as much spill. He's done a pretty good job of that on the car in the video, so the flow by his wheels is likely even better than the aforementioned Ecoboost picture.

I try to avoid making absolute statements without having run the CFD, but I'm pretty doubtful that you'd get even close to the same benefit from the vortices that you'd get from a Gurney flap. The vortex lowers the pressure in the area, but not like the flap would. The flap essentially creates a vacuum behind the flap that the vent air has to come out and fill.

I'm confused what you mean by the dive planes would do better. The Gurney flap is to lower the pressure behind it and help get air out of the wheel wells, not create downforce by themselves

Everything from the usual suspects I find doesn't fit under the 272mm, but there may be something out there other than the T3 kit. If you decide to go with the Maxima calipers and Z31 rotors, I believe I have a setup and live in LA. Would be happy to sell them to you.

Great write up and car. That's a hell of a shell you got for $3k.

The NACA inlets don't really need to be in an area of particularly high pressure to work. They just require the flow to be attached to the surface. The total pressure coming into the inlet should easily overcome any elevated static pressure on the rear of the car.

A bot posting about a bot. That's a new one for me

What type of suspension bushings do you have?

https://forums.hybridz.org/profile/58825-sophiaprin/ Nonsense post in a long-dead topic

The 280ZX also came with manual or power rack-and-pinion steering. You should be able to pick one of those up easily enough. Post a wanted ad in one of the popular Datsun parts groups on Facebook. Be careful about scammers though.

Here's another one. It's very subtle and might actually be a real person, but they post about 5 meaningless but not obviously spam comments in a row, and then will sneak in a link or reference to 4wheelparts or similar.

@tube80z