Think it was/is also the turbo andycaca was using to make 350bhp at 1bar.

350 @ 1 bar, that's what I wanted to hear... So what mods would have to be done to get to run at 1.05-1.1 bar?

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St205 WRC - Running sweet.

Remember, my goal is 360 to 380bhp with and absolute of 400 (in fact fact, forget 400, don't know why I said it...)

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St205 WRC - Running sweet.

I think a GT3071R is more suited to your needs. (not that ebay one though)
the GT2860 just wont flow enough in my opinion.
My friend had a 3071 on a standard engine with standard ECU running 1.2 Bar. it' went like *bleep*... and spooled as same as standard. So with a bit of playing and a good map you could easily bring that in.

oh, and once you've had 360....you'll want 400

Both Diceman and I researched this topic quite a bit.

Both of us have 3071 turbos. Sadly both of us have them fitted to the airing cupboard due to a deficiency we both share in the bovvered gene

On a technicality I (and JP IIRC) actually have a Frankenturbo GT2871 with an internally gated GT28 hot side paired to a GT30 CHRA/compressor

The GTX3071 looks a pretty good match and it's only money

corrected.

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If at first you don't suck seed, try drier grain.

Garett have introduced a couple of new frankenturbos that look interesting.

GTX2863R and GX2867R the compressor maps loo more suited to 400bhp.

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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

it was 346, but whats 4bhp between friends? the same turbo is now running at 1.6bar

i agree with wanting more...350 felt fast, and the 400+ i have now feels fast, but i want MORE MORE MORE!!!

at 1.6bar, the party is in full swing by 3500rpm and doesnt let off until way past my mechanically sympathetic revlimit of 7400

mine is the original GT3071R in the 0.86 housing. if i were to buy again, i would get the GTX version for lower spool threshold.

bear in mind you will have to not only weld a T3 flange onto your exhaust manifold and have the downpipe fabricated (buy shares in a 3" v-band factory!) but also grind away some of the gearbox casing where the inlet would foul it. doing this isnt really a problem as there is plenty of meat to remove from the gearbox.

Sorry to bring this up again. What I'm really looking for is roughly the spec of the GT3071R but I would like the dual ball bearings (GTX) in it to bring the spool down...
I don't mind sacrificing top HP for quicker spool so will go for a slightly smaller turbo..
So, 360-380bhp @ 1.0-1.4 bar with as little lag as possible (hence the GTX option) Is this possible or am I dreaming?????

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St205 WRC - Running sweet.

Just read this and its along the same lines as what I'm after.... What GTX version would you have gone for? Also, 0.86 housing?? Have you done anything head/cam/timing wise to get a decent-ish spool up?
Another thing, how will a GTX3071R compare to a GT3071R?

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St205 WRC - Running sweet.

I'm looking into these turbos as well at the moment and you would probably be better off with the .63 ar for your requirements as its will offer quicker spool and should be plenty man enough to achieve your power goals. Go to the .83 if you want to leave slack for pushing it into the 400bhp+++ range

As a guide I'm thinking of going for the GTX3071r with the .83 ar on mine, but I'm aiming for more like 450bhp+ and quicker spool than my hybrid.

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GT4 no 10 - I must be mad :help:

^^^Click the banner for my Black Treacle project thread ^^^

Now back home and mapped to 531bhp & 411lb/ft - that's enough power for now!

I believe Dan (the animal) is going for a GTX3071, not sure what ar though. I suspect a few more months before it's ready for an opinion (and even longer to compare with my GT3071 )

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If at first you don't suck seed, try drier grain.

I originally missed this! We have GT3071R turbine wheel inside a GT28 turbine housing. Better than Gt2871R.

IMHO GtX3071R is a nice 500bhp turbo. Spool and "boost threshold" appear lower than non "X" variants for both GTX2860R and GTX3071R. If I were to do it again I may consider a GTX2860R or the slightly bigger frankenturbos. GTX3071R is too big for me and road application.

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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

i've done alot of gt2860rs kits, they typically spool like a ct20b (tiny bit faster) and are peaking out around 360bhp and make abit more midrange torque.

What ever setup you go for i highly recommend using extenal wastegate to help with the boost creep associated with the internal wastegate of the GT28 on a 3sgte. Even if you plumb it back into the downpipe to make it quiet.

I find the 60mm compression isn't a huge gain over the ct20b although does punch harder, but there is also the GTX2863r and GTX2868r now as well which shoudln't add much more lag.

GT3071r is a smallish turbocharger but remember its capable of 450bhp if you ring the neck outta it where the ct20b is maxed at 320bhp so you can't really compare spool up times, but theres only about 250-300rpm in it between the 2 so i'd say it does a bloody good job in comparisons.

I've not done a cat in the downpipe yet but if someone provides me with a sports cat i can build it in no probs, the only issue is that i normally have a flexable downpipe to avoid any cracking, never cracked one yet since adding these so the cat would have to go there making it a solid downpipe again, so can't guarantee against cracking as there would be no movement, and thats what i needs.

if there is anything i can help with just ask buddy, done alot of these now, also most of the stuff i can offer isn't even on the website so best to ask. its not an easy job and i put alot of time and effort into getting these correct, most people who try it themselves over my kits always come back and say it worked out more expensive to do it themselves, or when it does come cheaper they complain about reliability issues and fit.

Animal66 yours is actually a GTX3071r and the one i made 450bhp@1.5bar was a normal GT3071r although like i said above the boost wasn't that high but the mods were pushing it, massive camshafts and a huge intake manifold designed for peak flow. But saying that even on sutble built cars with sensible mild lift 264's (not even lumpy) they are still pushing 420ish at 1.5bar.

Tim
TB Developments

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