So I was paying for my long debated choice of a GTX2867r when I came across mention of this - http://www.turbobygarrett.com/turbob...arger#GTX2871R Anybody heard anything about it ? For me I was wanting to squeeze as much power from the stock block as I could with supporting mods like 740's , Nistune ect so wondering whether I should just carry on with the 2867 or cancel and wait for these ( few weeks according to UK supplier ) Hoping from some input from some tubro guru's as im still just about getting my head round what the numbers in the name mean ! Heres the compressor graphs for those that can make sense of them -
I'd hope a GTX2871 has a VERY different turbine wheel to a normal GT2871 (all other GTXs have the normal GT turbine wheel), as the standard GT28 turbine wheel is all out of flow (and still a massive restriction) at about 450bhp regardless of compressor (which is why they stopped at GTX2867), so a bigger compressor is pointless. ATP made a GT2876 and despite the 500-550bhp compressor that topped out about 450 for the same reason. How much do you really want/expect from your stock engine? Spending mega bucks on a GTX turbo and only having Nistune controlling shiz seems a bit of a funny way around things too.
High 300's is the target , Im happy to go with the GTX2867r for the little bit more money. The car its going on wont be ready for to fit to for a couple months so just don't want to get down the line to find the GTX2871 released at the same sort of money and kicking myself "IF" its the better turbo choice.
You've contradicted yourself; are you after as much power out of the stock block as possible or high 300's? Why, if you're chasing brute power figures, are you running such a tiny turbo at all? If you've got that much money to spend on a turbo Stav's right, you'd be better with something else and you'd get better performance out of a better ECU.
if you only want high 300's surely a GTX is way OTT, they are a fortune and you have to then buy the turbine housing separate. Why not just go for a standard GT2871 with an external gate or a GT3071 or even a Holset alternative which is masses cheaper
Save your money, buy 3071, stick with nistune. All will be grand and you will no doubt be. Very satisfied
Spoke with mappers and general opinion was that I would need a external wastegate with a 3071 and still be on the laggy side , The GTX is only another £2-300 inc housing , Just heard the GT2871 dies of a bit towards the top end so the GTX ( either one) seemed a good mid ground between the 2871 and the 3071.
Well you are speaking to the wrong tuners.. I had a low mount gt30 with an .86 rear, would be on full boost at well below 4k. And ran 1.5bar easily to the limiter. Only reason I didn't run more boost was that my internal map sensor on my link atom was only a 2.5 bar sensor.
And to add... A gt30 is 900 quid. No wastegate needed. No top mount, no custom fab, just fit it, run loads of boost and be happy.
it realy is hard to choose. i have a built sr20det specs: cp pistons k1 conrods acl bearings arp headstuds cosworth head gasket nistune ecu, z32 maf and blitz spec r dual sbc boostcontroller and driftworks low mount exhaust header and i doubt between a gtx2867r, gtx2871, gtx3067r or gtx3071r i want something between 450 and 520 hp on the engine and the fastest spoolup possible. you olso have different a/r you can take 0,64 a/r and 0.86 a/r but what is the best setup
running a GTX compressor wheel on my new hybrid unit (Based on a 3071R) they move much much more air than a standard wheel.. so much so I'm now having to upgrade from a 38mm External gate to a 50mm External gate as it cant keep up and is creeping boost like mad. I also agree that a better ECU will give you more power. I went from Nistune to a Link G4 and made 40bhp and another 50torques...
