What turbo set up are members running with 500bhp and upwards.
I’m about to build my stroked engine and can’t decide and what turbo/manifold to run for 500bhp and above.
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What turbo set up are members running with 500bhp and upwards.
I’m about to build my stroked engine and can’t decide and what turbo/manifold to run for 500bhp and above.
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GTX3071R over 500hp on an SR22
I didn’t know if the 3071 would do it or if it would have to be the 3076. I wasn’t sure how the displacement would effect the turbo
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What sort of power were you making. What manifolds did you run also
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Less pressure ratio for similar air flow, usually drives you to a slightly larger turbo but the GTX compressor maps are wide for their size. The new G25 units are wider still. You might also look at a BW EFR 7670 which may work better with a ~2.2l over a 2.0l. They seem a bit peaky on smaller engines so a little extra displacement might help get it going.
Alternatively you could give a G25-550 a go. It won't have much left in it at 500hp but should get on boost really nice since it's only a 60mm compressor and a 54mm turbine. Only negative is they look like they are only mono scroll at the moment, at least with a GT30 you could get a twin scroll housing for it which will help at lower speed and it's a good match in terms of wheel size ratios so responds well. The 76mm won't offer much more I wouldn't think with a GT30 turbine on a smaller engine - in so much as you'll trade off bottom end for not much gain up top.
Last edited by zeppelin101; 23-11-2017 at 10:34.
I was looking at the be 7670 for the reason of internally gated. With it been a track car the internal gate would help with drive by noise limits.
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BW have updated their Airwerks range and have a new range of S200s called SX-E. They have big inconel 70mm turbines (so won't be as responsive as a 7670) but the compressors look promising and they are considerably cheaper. You might take a look at the 57mm inducer wheels with the smaller housing. Ought to breeze 500hp with some margin. Not internally gated though, you'll only get that with a 7670. The EFR has a very lazy surge line though and isn't all that efficient so you will pay a penalty on boost threshold. A GTX3071r is better in that regard.
The airwerks are really cheap in comparison to virtually everything else. I don’t know enough about them to know what the size difference of compressors and turbines makes. You know your stuff though
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General rule of thumb is that for a fixed exducer size, reducing inducer size improves surge margin at the expense of peak flow and can improve peak wheel efficiency as well (but thats not nailed on). As trim gets larger the max flow capability improves but the map tips over to the right a long way and it costs you efficiency on the run up line.
I'm not too well versed in Holsets but smaller trim ratios are usually a feature of big diesel turbos because they want quite an upright surge margin to deliver a lot of pressure ratio at lowish mass flows which probably explains how some of them perform as well as they do in petrol applications.
3071 seems to be the way forward. What’s the Range on them. Is 500 screwing the turbo to the limits
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There isn't much left in it, it's more on the edge with a 2.0l than it will be a 2.2.
So the more displacement the easier it is on the turbo and the further you can push the turbo.
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Depends on the shape of the compressor map. Peak flow is at a pressure ratio of ~2.5 based on that map which probably corresponds to about 1.4 ish bar of manifold pressure taking into account pressure loss at the intercooler and before the compressor. As you demand more boost pressure for broadly the same mass flow obviously the pressure ratio goes up but you'll run into compressor over speed when you're at the limits of the turbo. The compressor efficiency is also bad so the turbine pressure is ramping up very quickly which makes it worse from an ignition advance and engine work point of view.
Mine peaked at 507bhp, but ran out of fuel capacity. Pretty sure Ben got close to 530bhp on his SR20 before he went 22
Last edited by Drifter; 25-11-2017 at 17:04.
another vote for gtx3071made 501hp with an sr20 in mine.
What manifold you running Nash
Looks like 3071 is def the one to go for.
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full race mate
You get the full race kit.
Iv looked at the full race and mazworxs kit.
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