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Gtir Motorsport club » General Discusion » Gtir related Discussion » Exhaust Manifold

Exhaust Manifold

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1 Exhaust Manifold on 14th September 2016, 9:28 pm

Moss Ali


Anyone tried this:

http://m.ebay.co.uk/itm/Pulsar-GTiR-SR20DET-3mm-Stainless-Steel-Tubular-Turbo-Exhaust-Manifold-/361384550941?nav=SEARCH

Sold by Race Spec Performance in Sheffield.

2 Re: Exhaust Manifold on 14th September 2016, 9:35 pm

shroom

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Not really sure. Japspeed manifolds crack all the time and I am insure of thickness tbh. That one states it has a years warranty and 3mm thick but who knows what it will be like. It looks the same as a japspeed one to me. How much power will you be after a ported and wrapped stock manifold looks good too see my pics of mine in the thread on general discussion... :-)

3 Re: Exhaust Manifold on 14th September 2016, 9:43 pm

Moss Ali


Eventually around 400.

Isn't a tabular manifold better even at lower hp?

4 Re: Exhaust Manifold on 14th September 2016, 9:47 pm

nomad

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Porting a stock manifold is better .... i think the japspeed manifolds are quite thin i wouldnt say they are 3mm thick tubing .... that manifolds same design but guess it would be for stock fitment .....


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5 Re: Exhaust Manifold on 14th September 2016, 9:53 pm

Moss Ali


Strange that. I have their aluminium radiator and it works very well. Would have thought they'd do a better job with their manifolds than the reputation they have with them

Any idea of how much porting costs?

6 Re: Exhaust Manifold on 14th September 2016, 9:55 pm

gtir_woody

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I'd go with porting the stock manifold. That manifold might be thicker than the cheap ones but I think it will still cause you problems down the track. If you want an aftermarket manifold a mild steel steam pipe manifold is what you are after.

7 Re: Exhaust Manifold on 15th September 2016, 5:44 am

Mr B

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gtir technician
gtir technician
Even unported standard has achieved over 450hp.
Top effort on porting standard manifold & fitting best design elbow & exhaust is where money wants go.
If going tubular it needs be proper quality & design, runner length & diameter all important for proper worth while result & needs match your build criteria .
If you using a turbo that will fit in stock location & flange then stick with standard & port it, blueprint it to head ports & do a nice effort of heat wrapping it .
Equal length runners are not huge concern on turbos, gas velocity & free flow is important though .
Shiny parts look nice but without design data such as runner lengths, diameters, flow bench & dyno results most are nothing more than short term jewelery .
Stainless not a great material for turbo manifold, like woody mentioned steam pipe is pretty good, you can make some first class manifolds out of the pre formed steam pipe bends & it will last years & if ceramic coated look better too.

8 Re: Exhaust Manifold on 15th September 2016, 6:27 am

PartyPete

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the one star club
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Mightydquin made over 470bhp on a ported manifold, I'm just over 400bhp on one as well!

9 Re: Exhaust Manifold on 15th September 2016, 6:44 am

gtir_woody

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As above, great results can be had from the standard manifold. Upgrading isn't always required especially if budgeting and spending the money where it's really required.

10 Re: Exhaust Manifold on 15th September 2016, 11:34 am

Moss Ali


Thanks everyone. Any recommended machinists?

11 Re: Exhaust Manifold on 15th September 2016, 4:15 pm

Welling_AL

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I remember Johnny posted this a few years ago as i considered getting mine done - just never got round to it:

http://www.gtir-motorsport-club.com/t2149-ported-manifold?highlight=manifold+porting

Not sure if this place is still going but could be worth looking them up.

12 Re: Exhaust Manifold on 15th September 2016, 8:33 pm

Gostek

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How far are from Peterborough mate? I've ported few standard manifolds (Cosmic has one)



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13 Re: Exhaust Manifold on 15th September 2016, 8:44 pm

johnny gtir

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I just made 411bhp on a ported one. Still ain't had time to say a thankyou to bob but will do a post when I get 5 mins

14 Re: Exhaust Manifold on 15th September 2016, 8:51 pm

shroom

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Looks good gostek!

Good power Johnny :-)

15 Re: Exhaust Manifold on 15th September 2016, 9:30 pm

Gostek

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Thanks Shroom this was half way through I've removed bit more and made it tad smoother. I have to find out how to weld cast iron so I could chop few bits of collector too.


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16 Re: Exhaust Manifold on 15th September 2016, 9:54 pm

nomad

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Admin
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You stick weld it with nickel rods but preheat the cast iron with a blow torch or tig weld it
.....


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17 Re: Exhaust Manifold on 15th September 2016, 10:12 pm

Gostek

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I need to find someone with tig...


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18 Re: Exhaust Manifold on 16th September 2016, 6:58 am

Mr B

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gtir technician
gtir technician
It not too hard do yourself if got air die grinder & get some carbide bits etc. Matching ports to head & gasket important & takes most time . Plenty of old cast manifolds about so would be quite easy for someone collect a few & go full out & get small batch welded then do porting work to the max & heat wrap them neat & sell on . Ideally want head too for proper blueprinting so if get manifold done remotely you still ideally want blueprint it to your head ports and gasket .

19 Re: Exhaust Manifold on 20th September 2016, 7:39 pm

GTIRSI

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Do not buy these manifolds they don't fit the Gtir will let you know why when I know more!!!

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