US Headers & Exhausts NA

[hks_kansei]

So, in formula 1 they try and reduce weight dramatically, down to every last gram.

Here is a Formula 1 V10, with tuned extractors.

http://upload.wikimedia.org/wikipedia/c ... anello.jpg

now, if you could get tuned length extracors by simply reducing the diameter, that would mean you could reduce weight, for example, the pipe on the rearmost cylinder could be half that length, saving weight on all that "useless" extra pipework.
and cylinder 1 would have less weight in the headers due to the smaller pipe being less weight than a larger one.

if diameter was the only possible variable here..... why would Formula 1 engineers not use it?



And I look forward to the review of your headers, no doubt it will be 100% unbiased and properly tested.
"the car runs"
"it sounds faster"
"it picked up 10kw, I can feel it, my mate said it felt faster too"

If anything you might get a cool exhaust note from the uneven exhaust pulses, but that;s about it.

[sailaholic]

Ummmm I think you missed something mx5 is naturally aspirated. Sti is not.

[tbro]

Yep=======length race tuned

[gslender]

There is a saying that I think applies here....

I learned long ago, never to wrestle with a pig.
You get dirty, and besides, the pig likes it.


Sent from my iPad using Tapatalk HD

[Dupain]

So, in formula 1 they try and reduce weight dramatically, down to every last gram.

Here is a Formula 1 V10, with tuned extractors.

http://upload.wikimedia.org/wikipedia/c ... anello.jpg

now, if you could get tuned length extracors by simply reducing the diameter, that would mean you could reduce weight, for example, the pipe on the rearmost cylinder could be half that length, saving weight on all that "useless" extra pipework.
and cylinder 1 would have less weight in the headers due to the smaller pipe being less weight than a larger one.

if diameter was the only possible variable here..... why would Formula 1 engineers not use it?



And I look forward to the review of your headers, no doubt it will be 100% unbiased and properly tested.
"the car runs"
"it sounds faster"
"it picked up 10kw, I can feel it, my mate said it felt faster too"

If anything you might get a cool exhaust note from the uneven exhaust pulses, but that;s about it.

Variables are length and internal diameter. You have to remember that.

[orx626]

Dupain, from your posts in this thread it is clear to me that you do not fully understand, or are able to effectively apply the fluid dynamic concepts you were taught at university whilst doing your Chemical Engineering degree. The reason I say this is that you would be agreeing with the majority of the advice that the forum members have offered if you did. I don't believe anyone here has agreed in full with your performance assessment of the headers you have purchased. Have you asked yourself why that would be so?

In general forum members don't take pleasure in telling other forum members that they are wrong or ill-advised...well I don't anyway. Like you some of the forum members here are very well educated at an engineering level, some have a wealth of experience, and in some cases they have both! This forum is here for MX-5 enthusiasts to help each other enjoy their passion and at times that requires the promotion of incorrect information, bad advice and flawed concepts to be flagged and discussed... especially those that are safety related. However, I digress.

All the best with your purchase.

[taminga16]

I have just found this thread . Asthetics are just so important.
Greg.

Look in the end, I'm reviewing a cheap, decent looking header with promised power gains.

Get the pic up if you can and have a look.

Dupain.

[Dupain]

Dupain, from your posts in this thread it is clear to me that you do not fully understand, or are able to effectively apply the fluid dynamic concepts you were taught at university whilst doing your Chemical Engineering degree. The reason I say this is that you would be agreeing with the majority of the advice that the forum members have offered if you did. I don't believe anyone here has agreed in full with your performance assessment of the headers you have purchased. Have you asked yourself why that would be so?

In general forum members don't take pleasure in telling other forum members that they are wrong or ill-advised...well I don't anyway. Like you some of the forum members here are very well educated at an engineering level, some have a wealth of experience, and in some cases they have both! This forum is here for MX-5 enthusiasts to help each other enjoy their passion and at times that requires the promotion of incorrect information, bad advice and flawed concepts to be flagged and discussed... especially those that are safety related. However, I digress.

All the best with your purchase.

Argument is severely flawed. Multinational vs back yard boys hearsay. Deary me. The funny thing is you guys don't have a single piece of evidence. It's a new product and dozens have been sold. You "experts" don't even have data any 4-1 systems or have any idea where to buy one etc.

Have some effort at least to do proper research.

Should land this Thursday.

[ManiacLachy]

Yeah, Danny has no experience and doesn't know what he's taking about at all. Certainly isn't an expert. /sarcasm.

[jimmy_vee]

[emily_mx5]

It is clear that your knowledge vastly exceeds all of us lowly cartalk members.
I hereby suggest you pose your thoughts and questions from now on to miata turbo.

Definitely take the same argumentative approach there too.

[hks_kansei]

Actually Miata TUrbo would be a good one to ask.

There are a lot of members there who really know their stuff, including fabricators etc who make parts for a living.

They will be able to give you a good objective response.

[Dupain]

Yeah, Danny has no experience and doesn't know what he's taking about at all. Certainly isn't an expert. /sarcasm.

Give me some data. Give me a reccomendation on a 4-1 to buy.

How many here have 4-1 headers on their 5? ZERO.

I'm giving it a go - evidence based analysis, not some hearsay. Baseline dynos are available. We'll see how it goes on the dyno.

The bullies on this thread, do you actually drive/ mod your cars? Or just park it and talk shiit all day on the forum?

[project.r.racing]

hks_kansei - hits the track, does autocross
sailaholic - builds and races race cars
tbro - builds and races race cars, mechanic by trade
gslender - hits the track regularly
orx626 - builds and races race cars, owns a mx5 performance shop
project.r.racing - kits the track regularly, does autocross, rally, motorkhana

and that is only the posters i'm aware of from this page alone. i think i could find more in this thread if i went looking.

no one is bullying you. grow up!!! there is a massive experience base you just accused of being sh!t talkers. look in the mirror. he is the sh!t talker. the only one doing any bullying is you. you have slagged of most poster and the entire australia population so far in this thread.

[plohl]

project.r beat me....

Give me some data. Give me a reccomendation on a 4-1 to buy.

Racing beat....

How many here have 4-1 headers on their 5? ZERO.

There are a number of cars that run 4-1 exhausts, mostly I know of a number of people running Racing Beat exhaust manifolds which are quite a popular choice in the US, and are easily to get in Aus now as there are 2 sponsors on this forum selling them, AutomotivePlus (mx5Plus) and Deckspeed racing. Racing beat also have quite a bit of information about the development of the exhaust. If you were to say, search buy miata 4-1 exhaust manifold http://bit.ly/1n035co, you would find said information. I also know of cars running 4-1 exhaust manifold in the prod sports series in QLD, some of these have been developed by GLS Engineering... on an engine dyno.

I'm giving it a go - evidence based analysis, not some hearsay. Baseline dynos are available. We'll see how it goes on the dyno.

Well done. I look forward to seeing the results. Regardless of your findings, the manifold still is not equal length, which the company claims.

The bullies on this thread, do you actually drive/ mod your cars? Or just park it and talk shiit all day on the forum?

Most of the people that have commented here opposing the argument you have so, eloquently put forth, have quite a lot of mechanical, motorsport, manufacturing and engineering experience (just to name a few).

Here are some good references:
Bell, A. G. (1998). Four-Stroke Performance Tuning. Somerset, UK: Haynes Publishing.
Blair, G. P. (1999). Design and Simulation of Four-Stroke Engines. Warrendale, PA, USA: Society of Automotive Engineers, Inc.
Smith, P. H., & Morrison, J. C. (1971). The Scientific Design of Exhaust and Intake Systems, 3rd edn. USA: Bentley Publishers

Bell is pretty easy to digest, the other two... not so much.