Performance 4-1 Headers
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lambertius

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Performance 4-1 Headers
« on: November 05, 2015, 07:54:28 AM »
I was wondering if anyone would be interested in doing a group buy to get some performance headers made?

I have been working on an ITB kit (which is nearly finished and can be seen in this thread http://www.m42club.com/forum/index.php?topic=18442.0) which has shown some significant performance changes. I've wanted to make some tuned headers to compliment the intake but I don't have the resources to do it on my own. At this point the only way that I can see it being done is to organise a group buy to front the costs of the development - would anyone be interested in doing this with me?

Cheers
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Darky

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Re: Performance 4-1 Headers
« Reply #1 on: November 05, 2015, 11:20:05 PM »
In but I have a e30 and yours is a e36.
Also what sizing are you considering?
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jerseytim

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Re: Performance 4-1 Headers
« Reply #2 on: November 06, 2015, 05:53:53 AM »
would this be for left or right hand drive as i have just bought a 4 into 1 that won't fit my rhd car.
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Darky

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Re: Performance 4-1 Headers
« Reply #3 on: November 06, 2015, 11:50:14 PM »
Quote from: jerseytim on November 06, 2015, 05:53:53 AM
would this be for left or right hand drive as i have just bought a 4 into 1 that won't fit my rhd car.

Rhd

Both myself and lambertius reside in Melbourne Australia.
However he has a e36 and I have a e30.

Where did you get your headers from? Why won't they fit. Steering column?

Regards
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benz-tech

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Re: Performance 4-1 Headers
« Reply #4 on: November 07, 2015, 08:56:45 AM »
Rhd issues aside, what about making it a step-up style and starting off with the factory manifold, cutting 6" away from the flange and then tig larger pipe and so on. Just a thought, my Datsun headers started off at 1.5" then 1 5/" then 1 3/4" into a merge collector. Long-tube benefits with supposedly no loss in top end. Plus the flange and first bend would already be done for you. I would tig around the outside of the pipe at the flange so that you could grind the weld smooth on the inside. Just a thought, I've never designed a header.
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jerseytim

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Re: Performance 4-1 Headers
« Reply #5 on: November 07, 2015, 05:47:50 PM »
item number 331701884336 on ebay.co.uk
they are from america and he posted to the uk for £40 so cost just over £100 delivered. shame it won't fit with the steering column 
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Darky

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Re: Performance 4-1 Headers
« Reply #6 on: November 07, 2015, 08:31:11 PM »
Hi Benz tech

This is a rhd e30 m42 exhaust manifold

I think I'll start from scratch. Lhd manifolds are really really good in comparison.
I have seen that on dirt bikes though interesting.
Designing a header all depends on cylinder volume and camshaft duration, desired peak rpm.

Hi jerseytim

I have seen those headers before there a copy of the supersprint that are used in America. Lhd
supersprints can't fit rhd and have never claimed too.

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benz-tech

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Re: Performance 4-1 Headers
« Reply #7 on: November 07, 2015, 11:15:23 PM »
From the looks of it,  rhd cars were an afterthought. I see why you're looking into making something better.
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lambertius

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Re: Performance 4-1 Headers
« Reply #8 on: November 08, 2015, 03:00:22 AM »
Quote from: Darky on November 05, 2015, 11:20:05 PM
In but I have a e30 and yours is a e36.
Also what sizing are you considering?

I haven't worked it out yet, but I would be designing for peak torque at 4500RPM, with a flat behaviour.

Quote from: jerseytim on November 06, 2015, 05:53:53 AM
would this be for left or right hand drive as i have just bought a 4 into 1 that won't fit my rhd car.

RHD, though I expect it should fit LHD as well since there will be no steering column obstructions. As for the differences between E30 and E36, I would have a chat to Brintech to see if a solution for both can be made. I expect that it could be made to fit both cars, but the rest of the exhaust will need to be modified/replaced in order to accommodate in one of the models.

I won't bother though unless I can get 5+ people keen to do it. It is a time consuming process to fabricate for Brintech so he is less keen to take on the risk than Rama was with the ITB kit.
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