I'm going to build my own supercar

Merlin5 · 9 Oct 2017 at 04:48

Yes, and I'll upload pictures of the finished car to get your feedback.
You don't mind waiting nearly two decades to see them, right?

Nasher · 9 Oct 2017 at 08:23

Usually these things turn out terrible. But that is actually a good job.

wedrum · 9 Oct 2017 at 08:40

incredible

killsta · 9 Oct 2017 at 08:59

Probably better put together than an original..

Yaayuh! · 9 Oct 2017 at 09:44

killsta said:
Probably better put together than an original..

I was going to say, the original was a pretty terrible car, this could be a lot better

Dup · 9 Oct 2017 at 11:36

Quite an old story this isn't it?

But what on earth is the thinking behind having the exhaust collectors having 2 runs from each bank? Seems odd.

More info and close view of it:

Great fabrication work, can't argue with the dedication, but surely TV car shows would have this done in 20 mins no?

adolf hamster · 9 Oct 2017 at 15:18

this is the sort of thing i could see myself doing some day, although it isn't going to be replicating any particular car, it'll be sticking a small block crate motor into a vaguely esprit shaped tube chassis.

Django x2 · 9 Oct 2017 at 15:40

Dup said:
Quite an old story this isn't it?

But what on earth is the thinking behind having the exhaust collectors having 2 runs from each bank? Seems odd.

Great fabrication work, can't argue with the dedication, but surely TV car shows would have this done in 20 mins no?

You understand firing orders and exhaust slugs right?

AHarvey · 9 Oct 2017 at 16:05

If I was going to do this it'd be an Arial Atom style.

Big tubular frame, Golf R or twin supercharged hayabusa engines. Spine breaking.

Dup · 9 Oct 2017 at 16:17

Django x2 said:
You understand firing orders and exhaust slugs right?

Nope, hence asking. I thought equal length is what is aimed for with a manifold.

Django x2 · 9 Oct 2017 at 21:25

Dup said:
Nope, hence asking. I thought equal length is what is aimed for with a manifold.

Nope. With tubular you want the slugs from the firing order to follow each other out of the exhaust as one long gas chain.

A quick quote from a tuner site to give you a basic principal

The goal of the header designer is to tune the travel of the negative pressure pulse of one cylinder so it hits the port of the next exhaust event of a different cylinder. How well this is accomplished determines to a large degree the power curve of your engine.
Building a good exhaust header and system is quite an artful application of science. It's all about synchronizing a sound wave and a rapidly cooling, and therefore shrinking and slowing, exhaust gas pulse traveling down the tube with another cylinder and its valve timing events. Keep in mind that when the exhaust valve cracks open, a sound wave punches out of the exhaust port at the speed of sound, approximately 18,500 inches per second, followed by the exhaust gas slug at about 3,600 inches per second. If the design is correct, when the high-pressure part of the sound wave passes through the collector, it is creating a low-pressure condition that reaches back through the other tubes and "pulls" the next exhaust pulse out of the cylinder, or at least offers less resistance than otherwise to the exiting gases.

Nasher · 10 Oct 2017 at 08:58

You can improve the power curve quite a bit just by changing the header for a better quality one (Manifold in proper English).