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NB Header information
Posted: Fri Jul 24, 2015 12:23 pm
by yods
Hi everyone,
considering a supercharger and I've been reading that the 01+ NB headers are pretty good already and may not be a significant upgrade/restriction. Can anyone confirm this or how to identify the 'good' headers? Not chasing specific numbers and the intake manifold and engine will remain stock.
Cheers
Peter
Re: NB Header information
Posted: Fri Jul 24, 2015 2:12 pm
by NitroDann
They certainly are not bad at all (01+ only, I would never say this about other mx5 designs, ever). However superchargers making 300whp need 300whp worth of exhaust flow for example.
If you intend to make 150whp they will be great, at 200whp they will be a restriction.
Dann
Re: NB Header information
Posted: Fri Jul 24, 2015 2:51 pm
by mx5002
As dann noted they are pretty good from the factory. I have only upgraded the secondaries and fitted a hi flow cat. I find it hard to justify the extra kw or 2 for the 500 bucks for decent headers
Re: NB Header information
Posted: Mon Jul 27, 2015 10:38 pm
by yods
Thanks guys - any easy way to visually identify if I've got the good headers?
Re: NB Header information
Posted: Wed Jul 29, 2015 7:21 pm
by speed
Check the year number of your car. Dann stated 2001 onwards.
What supercharger are you considering?
Re: NB Header information
Posted: Sun Aug 09, 2015 3:05 pm
by mx5002
Nb8b onwards got the good headers. So late 2000 (like mine) onwards.
What kind of supercharger are you looking at?
Re: NB Header information
Posted: Mon Nov 16, 2015 1:15 pm
by yods
Thanks - I meant the headers themselves as the year number of the car doesn't really tell me anything except what headers *should* be on the car.
Supercharger is a rotrex as part of a kraftwerks kit. Unfortunately I now have an unscheduled service to do first (engine replacement). Still looking at aftermarket headers but Mania only want to sell full exhausts currently.
Re: NB Header information
Posted: Tue Nov 17, 2015 10:33 am
by 93_Clubman
Can you take a pic of the headers on your car, or is there a heat shield covering them? Even if there's a heat shield a pic of the upper & lower parts might still provide enough visibility to identify them.
Re: NB Header information
Posted: Wed Nov 18, 2015 12:23 am
by Okibi
mx5002 wrote:Nb8b onwards got the good headers. So late 2000 (like mine) onwards....
American cast manifold
I know the American early NBs had a cast manifold but I hadn't realise the aussie design had changed when the VVT model was released.
Does anyone have a comparison photo?
SMB make extended secondaries and a high flow cat for the NB
Re: NB Header information
Posted: Wed Nov 18, 2015 12:54 am
by Okibi
Re: NB Header information
Posted: Wed Nov 18, 2015 11:32 am
by 93_Clubman
ADM NB8B headers:
Re: NB Header information
Posted: Wed Nov 18, 2015 2:53 pm
by Okibi
Very cool thanks for the photo.
Re: NB Header information
Posted: Sun Dec 06, 2015 1:08 am
by tomli123001
any chance for a stock secondary also?
I bought Regie's old SMB cat back exhaust for NB for my future track build.
Just wondering if worth upgrading the header or keep it stock. The car I will likely be getting is NB8B onwards and engine will stay stock for cheap/worry free, but slow track running.
