NitroDann's Long Awaited Garage Thread

[NitroDann]

While Im at it I thought Id mention how overkill a manifold like this is, patricks NA6 has a basic log manifold.

Dann

[Sean]

Looks like it will be very rear mounted which seems the opposite of the other stuff you usually do.

I guess I'm more wondering what the motivation is to rear mount rather than mid or forward - and if there is much of an advantage to an unequal length tube manifold over the more forward mount log style you've built in the past?

I'm working on an assumption that it's got to do with standard SE location rather than your own preference, but wondering if that'll limit the possibilites for the big dumps and V bands you're becoming known for?

Edit: your above post popped up inbetween me reading and responding and may answer the question...

[NitroDann]

Using the EXACT stock SE turbo location, which Ive been asked to do, there simply isnt room to connect cylinder 3/4 any differently, you definately cant turn the pipe away from the turbo like Ive done for cyl 1/2 and make a foot long pipe just for the sake of equal length and then turn it back into the collector.

Basically, the advantage of equal length is almost completely lost in a turbo setup.
Equal length only helps to tune scavenging on all cylinders to the same rpm, this allows the exhaust to 'come on' in a hit. Most 4/2/1 exhaust use equal lengths for paired cylinders, but do NOT have equal length pairs, that is cyl 1/3 may be 26" each but cyl 2/4 will be 32".
This gives a broader powerband.

In a turbo setup, the turbo 'hits' so you will never feel the exhaust scavenging 'hit', on top of that, the turbo manifold has great pressure before the turbo, so it has little or no suction scavenging effect anyways.

The important thing is great flow from each cylinder into the turbo. Looking at a log manifold we can see that each cylinder has to fight the next one to breathe, this lowers maximum power output, all else being equal. The solution? 1psi more boost.

With a tubular manifold, you use a little less boost, so you feel the turbo come on and 'hit' less, which makes it more linear, you may get a faster spool due to less restriction in the system, and of course, if you add that extra psi or 2 that you need to in a log, you get an extra 10-20HP at the very top.

Oh, and it looks awesome.


As for the big dump pipe the owner aleady purchased an aftermarket S15 dump pipe, with fully split design, this is similar in efficiency to a 3" v band straight off the turbo, almost.
For him it seemed the easier solution, it is for me thats for sure

I just have to mate that to his exhaust.

Dann

[wozzah1975]

I like that there is air between the runners around the turbo. Thats another failure with cheap ones, they bunch them together and they gett hotter than they would if they were designed properly.

Nice work bud.

Did you get my earlier email?

Cheers
Warren

[Apu]

Ceramic coated...

[Smokinscotty]

Thanks Apu,

Useful feedback anyone?

What would you want changed if it was yours?

Dann

EDIT: come on scott, I know how much time you spend reading in this thread, post too!

I'm learning heaps just trolling lol

[NitroDann]

Im pretty sure you mean lurking.

Dann

[NitroDann]

I like that there is air between the runners around the turbo. Thats another failure with cheap ones, they bunch them together and they gett hotter than they would if they were designed properly.

Nice work bud.

Did you get my earlier email?

Cheers
Warren

I did get your email, couldnt call you though, tried like 4 times.

Im getting the headers picked up from the depot tomorrow morning.

People have been home every day for a week, they left a note in the mailbox but I hadnt checked the mailbox for a set of headers lol.

Dann

[Muzdaman]

Looks awesome Dann. If I was planning to go turbo i would have to seriously consider something like this.

Cant wait to see pics of it welded and mounted up.

[deviant]

Christmas present for Dann?

http://www.icengineworks.com/

[NitroDann]

I have seen that before however its a long winded process, which teaches you nothing.

Eyeballing, cutting and grinding gets easier and faster every time. Plus I enjoy it.

I cut 2 pipe bends today wrong, got the third one right, and learned what I should have done.
Also the bends themselves arent that expensive, certainly worth less than my time.
And can be used again when you need a smaller bend.
Theres almost no wastage.

Dann

[dave2221]

Have you guys checked out this build thread from the states?

http://www.stanceworks.com/forums/showthread.php?t=22294

This guys a gun when it comes to exhausts and welding.... Although he does it for a living and its all computer generated and cut..... the work is amazing.

here are a few teaser pics

[16bit]

what are you predictions for the perfomance of this manifold dann? how do you think it will perform compared to the log manifold with a similar turbo and exhaust?

[rxmx]

Hey Dann the revisions you made are much better with the SE mani your building, have you considered thermal wrapping the mani as well as paint?

Basically, the advantage of equal length is almost completely lost in a turbo setup.

I think you would need more than 1-2psi to be on par with a proper equal length mani

Take a look at this article by full-race. They have done back to back testing with different cars/engines using a log vs an equal length tubular.

This B series honda made 48hp / 44ft/lb more after tuning with all other variables the same on low boost 10psi. Lost a little bit of spool and low down though which is expected.

http://www.full-race.com/articles/Bseriestest_writeup.pdf

[deviant]

Im getting the headers picked up from the depot tomorrow morning.

Picsorban