autocad is useless most of the time unless you're doing a turn-key job for someone on a large scale that require documents for filing purposes. Most of the time in our machine shop, the client usually gives us the design requirements on the back of a napkin.

I'm pretty fond of pro-e and bobcad, but are very very expensive. I used to have a couple licensed versions of inventor and autocad on my labtop for when I got bored in class

 

i'm a little late replying to this, but those wheels turned out great


underbody panel sounds pretty cool.

 

Thanks.

Tripp, did you get a chance to read over everything yet?

Also, the reason for the bump. From what I've just heard, the guy who runs TMA turbos no longer makes his turbo kits. Which basically means I now get to piece together my own turbo kit. Here's what I'm basically looking at:

-Custom turbo manifolds/downpipes
-(2x) Garrett T3/T4 hybrid turbos, .57 trim
-(2x) TiAL 44mm wastegates (1bar springs)
-Custom wastegate dump tubes (dumped out the fenders)
-TiAL 50mm BOV
-K2Motor FMIC (12"x32"x3")

I'm not sure on what size injectors I'm going with just yet. I need to do a little research yet. I'll probably just go with the biggest ***** I can find lol. Also, I'm considering going with a twincharged setup; twin turbos and a roots-style (most likely an Eaton M-112) supercharger. Obviously I'll be saving a good bit by piecing together my own kit (as opposed to buying a $6k kit), so I might just be saving enough that the blower pays for itself (be quiet, it's my logic and it makes me happy)

 

Quick question... anyone think two turbos, a supercharger, and a 75 shot of giggle gas is too much on a highway queen? (but seriously, I'm thinking about putting it on the bottle when I'm done)

Anyway, I decided yesterday I'm going to pull the gas tank and replace it with a fuel cell in the trunk once I get ready to add the rear diffuser. I'll probably shave the fuel door next summer when I get the car prepped for paint; I'll rig something up in the trunk so I can still fill the tank.

The idea behind pulling the gas tank is to allow a more efficient diffuser design. Pulling the tank will allow me to construct the diffuser to any angle I want; I'm thinking 12 degrees, but I need to do more research. The 12 degrees figure is agreed to be the best for a non-flat bottomed car, but I need to do more research to see if it's any different for flat-bottomed cars. I know the angle can be no more than 15 degrees or laminar flow won't be able to follow the diffuser.

 

It can be more than 15 degrees without the hassle of turbulent air velocity depending on the design and intricates of the system.


(god i hated fluid dynamics)

 

The important part in that post was the fact that the word "can" is italicized lol

Either way, I'm probably going to design it to a 12 degree angle; trying to keep laminar flow without flow separation over more than a 15 degree angle sounds like a lot more engineering than what I'd like to put into it. As it is, it'll be functional enough for a street car. While I like to think I'm going to track the car when I'm done, I doubt I'll be able to bring myself to do it; I'd hate to see 3-4 years' hard work and dedication as well as $30k put into a wall/tires/whatever at a track because I push either myself or the car (most likely the former) too far.

Besides, I doubt the diffuser will lose any function simply because it's angle of attack is 12 degrees rather than 15+.


(and this aerodynamic engineering/research really makes me wish I'd have gone to a standard college for something similar. But then again, I'm out of college and looking for a job 2 years before most of my friends)

 

That's where my degree kicks in..............lol

 

Bump... anyone want to help decide on what turbos I should go with?

Basically, any turbo is an option, provided it's decently sized (who cares about lag? The car's going to have a supercharger for power down low anyway) and externally gated. That's the big thing; I do not want internal wastegates on the car.

Right now, I'm between two turbos. If I go with used turbos, I think I'll go with 57-trim Garrett T3/T4's, due to availability. However, if I go new, I think I might just go big and get a pair of Garrett GT30R's (GT3076R to be exact), most likely with a 1.06 turbing A/R. The biggest downside to the GT30R I see right now is cost... roughly $1200 each, so we'll see.

Anyway, any one else have an turbo suggestions? Remember that the car is going to be a 4.3L v6, a huge cam, port/polished heads, and a roots-style supercharger, so it'll be generating a lot of exhaust flow... in other words, turbo lag won't be an issue unless it's just plain ridiculous (I'd like to be at full boost by 3500rpm).

*edit:

Two of these should be big enough, right?

On the left: GT28RS; on the right: GT3076R. And think, that disco potato (GT28RS) dimensionally the same as a t3/t4

 

two of these should get the job done

 

I'm running twin-turbos. I don't plan on running one turbo for each cylinder (though it'd be awesome). In other words, I'd like something a little bigger than a can of Scrumpy Jack premium english cider