Derracudas zermatt 20vt,6spd, 351awhp - July 4th drive vid

cuatrokoop · Post by **cuatrokoop** » Thu Aug 13, 2009 2:55 am

chapel wrote:what will stick out?
the LS2 coils use standard plug wires. the coils are mounted on the firewall.

Then how would they affect running a 7A valve cover? They wouldn't...But yes the 7A should fit an AAN. Same base casting for both heads.

chapel · Post by **chapel** » Thu Aug 13, 2009 8:20 am

I guess I wasn't sure what you were getting at will 'stick out'

my2000apb · Post by **my2000apb** » Thu Aug 13, 2009 8:22 am

chapel wrote:I guess I wasn't sure what you were getting at will 'stick out'

i think he thought you were using a COP setup whihc would look all weird with a 7a cover

chapel · Post by **chapel** » Thu Aug 13, 2009 8:25 am

Aha, that's what I thought he was getting at too.

my2000apb · Post by **my2000apb** » Thu Aug 13, 2009 8:26 am

chapel wrote:Aha, that's what I thought he was getting at too.

although it wont be much more goofy lookin that the plug wires coming out of the aan vc haaha

chapel · Post by **chapel** » Thu Aug 13, 2009 8:32 am

I just like the flatter look and the little vanes that run down it and the old school audi logo

derracuda · Post by **derracuda** » Thu Aug 13, 2009 10:07 am

aha.. ok. so you would just run long leads back to the firewall. that shouldn't be a problem....

vagrant_mugen · Post by **vagrant_mugen** » Fri Aug 14, 2009 12:02 am

your gonna love the flow of those new manifolds. i just hate to see people running cast units when its really not that expensive to make your own, as well as being pretty fun too.

i like what i see derek........... 8)

naudi80quattro · Post by **naudi80quattro** » Fri Aug 14, 2009 12:57 am

2nd that you can make so much money making and selling your manifolds too :-)

Longitudinal · Post by **Longitudinal** » Fri Aug 14, 2009 11:22 pm

derracuda wrote:header wrap tends to destroy things when it comes to turbo temps.... it keep too much heat in and crystalizes the metal. it's better to have an air gap around the pipes so they don't retain too much heat.

It's not that the metal crystallizes. Metals wouldn't be much without crystals. The crystal structure is able to change (going larger, I believe?) and cause the metal to become more brittle. Whether this is able to happen in a car, I cannot confirm or deny from my own experience, but it definitely DOES happen to metals including stainless steels given enough heat. A friend of mine is a retired electrical engineer for GE and dealt with such problems all the time on power generators.

Post by **Hank** » Sat Aug 15, 2009 7:40 am

A lot of it can be written off as work hardening. As the part goes into compression and tension with heat cycles, it becomes harder and harder, and want to expand less and less. That is a lot of the brittle stage that usually spells the death for headers. Metals that expand an contract less fair better, but head cycles work harden the workpiece as well, and eventually over a long period of time, they will harden as well. The thing they have going for them is that they dont expand to instigate the crack.

Hank

my2000apb · Post by **my2000apb** » Sat Aug 15, 2009 7:43 am

ShavedQuattro wrote:A lot of it can be written off as work hardening. As the part goes into compression and tension with heat cycles, it becomes harder and harder, and want to expand less and less. That is a lot of the brittle stage that usually spells the death for headers. Metals that expand an contract less fair better, but head cycles work harden the workpiece as well, and eventually over a long period of time, they will harden as well. The thing they have going for them is that they dont expand to instigate the crack.

Hank

a well designed / good flowing cast manifold is a beautiful piece in form and function as many will go hundreds of thousands of miles

Post by **Hank** » Sat Aug 15, 2009 7:45 am

highway miles maybe. I dont believe they will if beat on like most headers do. They typically dont see the heat extremes that headers do as well, and are usually not on extreme high HP appications.

Material Sience is material science.

ChrisAudi80 · Post by **ChrisAudi80** » Sat Aug 15, 2009 8:55 am

ShavedQuattro wrote:Material Sience is material science.

Funny you should say that. There was a bit of a discussion a few pages back about trained engineers vs. hands-on self-taught fabrication. The latter insinuated the former was being cocky.

However, if you know about materials science, any engineer would, you will know that when steel or iron gets heated up very high, say 800Celsius, the crystal structure makes the material very hard. That is why it gets brittle. The hardness readings go through the roof unless its stress relieved and made to be ductile again.

One of the reasons SS headers sometimes crack at the welds, is because of these extreme temp swings. Can you imagine what happens if you are out racing, your EGTs hit 1200-1500 and you splash through a deep puddle?
Ductility gone. There is a lot to be said for cast iron EMs and mild steel pipes.

ChrisAudi80 · Post by **ChrisAudi80** » Sat Aug 15, 2009 9:10 am

Say Derek, are you going to test the FMIC for flow and temperature distribution over that humongous core?
It should be possible to place some temp tape or even better some thermo couples and hook those up to a laptop. Blow in hot air under pressure with a big fan simulating cooling wind.

Your design is interesting and I saw your statement about effective cooling only taking place of the first 6" of core. I assume you mean in the flow direction.

Anyway, the direction of the air into the IC is quite sharp will the pressure be distributed evenly?

I hope it works.

Your IM work is far out too. Just weld it up like you want to. Who knows what it will do. Seeing what you have done so far, if you are not happy with it, you will tinker more with it. A perfectionist :-)

derracuda · Post by **derracuda** » Fri Aug 21, 2009 11:19 am

mmm... goodness.

section width/contact patch still is virtually identical, and these tires are about .75" shorter

ChrisAudi80 · Post by **ChrisAudi80** » Fri Aug 21, 2009 11:39 am

Can't wait to see this in action again. :-D

WOMBAT · Post by **WOMBAT** » Fri Aug 21, 2009 11:41 am

ahhh lookin good sir! :thumbsup:

derrish_vulf · Post by **derrish_vulf** » Sat Aug 22, 2009 3:52 am

Those wheels look great!!

my2000apb · Post by **my2000apb** » Sat Aug 22, 2009 9:06 am

countdown to waterlands?

derracuda · Post by **derracuda** » Sat Aug 22, 2009 12:24 pm

i dunno if i'm gonna make waterlands :( i'm waiting on my ECU from 034. the block is at the machine shop and i'm hoping to have it assembled this week. i jsut got word my interior might be ready though by the show..... so i could set up my interior at the show and see how that goes

meanwhile i play with the wheels and oogle them.. man, i am happy with these :drool:

205's suck

i lowered the front .5" so it has some proper stance finally

man, i love how wide these wheels and tires make the car look.

my2000apb · Post by **my2000apb** » Sat Aug 22, 2009 12:42 pm

derracuda wrote:i dunno if i'm gonna make waterlands :( i'm waiting on my ECU from 034. the block is at the machine shop and i'm hoping to have it assembled this week. i jsut got word my interior might be ready though by the show..... so i could set up my interior at the show and see how that goes

meanwhile i play with the wheels and oogle them.. man, i am happy with these

again a case of beauty and the beast, you and aaron, hahaha
it def doesnt sound impossible, judging from what youve put together in a short time. you can do it if the parts come in, wooooot

ChrisAudi80 · Post by **ChrisAudi80** » Sun Aug 23, 2009 12:08 am

That FMIC you fabbed looks badass, Derek. Any flow testing done on it?

Are those the runners I can see in the last pic? I can't wait to see what your IM will look like.

derrish_vulf · Post by **derrish_vulf** » Sun Aug 23, 2009 3:27 am

I mustve missed up but whats the size and et of your ronals??

They look killer with the new tires on :woowoo:

derracuda · Post by **derracuda** » Sun Aug 23, 2009 11:42 am

derrish_vulf wrote:I mustve missed up but whats the size and et of your ronals??

They look killer with the new tires on :woowoo:

17x8.5" ET34