TeamRX8

iTrader: (25)

^^^^That's some serious hardcore pr0n

Brettus

iTrader: (2)

That's because I got it off a different site .


I'm liking it - from what I can make out it outperforms the 3076 up top but should spool almost as well as the std 3071!

09Factor

I think it's an issue between the links and IE8. I see Red Xx'es in IE8 and all pics work fine in FF.

TeamRX8

iTrader: (25)

I wonder of MM can make it work for the Greddy upgrade kit?

Brettus

iTrader: (2)

Should be a breeze - pity no-one else has done that conversion as it would be an awesome option to have ...

Nemesis8

iTrader: (3)

Well, I can see them from my laptop just fine. Dang desktop.

That is some nice looking stuff right there. Thanks

IronTanuki

My Gt3071R is coming back out tomorrow to have the center section clocked... too bad it looks like it's over a grand even without the housing or I'd swap to the GTX3071R in a heartbeat.

Maybe once the engine goes out I can sneak it in as part of the rebuild

Nemesis8

iTrader: (3)

Yep - that worked also.

Brettus

iTrader: (2)

be the first - do eeeeeeet !!!!!

MazdaManiac

iTrader: (3)

I already have a GTX3076R sitting here.
That should tell you something.

Brettus

iTrader: (2)

/\ that you get all the cool toys to play with .....

TeamRX8

iTrader: (25)

It doesn't tell us anything which is why you should tell us more ....

MazdaManiac

iTrader: (3)

For a start, the '76 is a better choice than the '71.

IronTanuki

Besides matching the machining done to the compressor housing on the GT3071R would the GTX3076R CHRA be a direct swap into the existing turbine housing on your kits and fit into the same location without any additional modifications?

MazdaManiac

iTrader: (3)

Qualified yes.

Brettus

iTrader: (2)

Doesn't that depend on what you are doing with it ?
Below 2PR the maps are very close so unless you are shooting for 400whp wouldn't the the gtx3071's quicker spooling would make it a better choice ?

MazdaManiac

iTrader: (3)

Nope - unless you are building a piston engine.
The GTX '76 will produce comparable flow rates at the same turbine flow as the regular '71, so any boost onset differences will be compensated by the increased mass flow.

TeamRX8

iTrader: (25)

I would respectfully disagree with the choice because our goals are different. I have no doubt that it will spool the same or better than the standard 3071, but given the top end limitations of the Renesis I'd rather spool up faster still.

MazdaManiac

iTrader: (3)

You didn't understand what I said.
The '76GTX will produce as much flow down low as the '71 (which is as much as you can use) at a lower spool speed.
There is no "spool up faster still" without destroying the motor and the turbo.

TeamRX8

iTrader: (25)

I would again respectfully part ways with you on that assessment

MazdaManiac

iTrader: (3)

OK - So tell me what you expect to happen if your theoretical turbo could "spool faster" than the 3071?

Keeping in mind that:

a) Manifold pressure does NOT equal flow and
b) a 100% increase of flow on a 3071-powered motor at, say, 2500 RPM would equate to only the same airflow at 3200 on the same setup, which, once normalized for the reciprocal losses, lack of mechanical advantage from the lower RPM and necessary ignition retard at low RPMs, would equal a net loss of torque at that RPM.

Brettus

iTrader: (2)

I am struggling to understand your theory there but the proof will be in the pudding . If you have anyway to compare spool difference to the stock 3071 once you have it installed then I'm sure many of us will be interested to hear your findings .

MazdaManiac

iTrader: (3)

Well, let's put it this way:

Simply upping the compressor wheel to a '76 on the "standard" 3071r only raises the onset boost threshold by 500 - 700 RPM (while providing more air than most people will need across the entire RPM band).
The GTX '76 will flow the same amount of air in that "hole" as the regular '71, even though the shaft is spinning at the same rate as it does in the "regular" 3076.

Brettus

iTrader: (2)

/\ I see what you are saying but I don't see how you got that the gtx3076 would outflow a stock 3076 at low shaft speed . IE how do you arrive at that from looking at the map?




UNLESS THE KEY IS THE TURBINE MAP - WHICH i CAN'T SEE BECAUSE OF THE WHOLE red x SITUATION

For reference : uncanny how the GTX3071 matches the gt3076 map almost exactly ..

TeamRX8

iTrader: (25)

Ran the calcs rather than estimating in my head and would say that MM is right and I'm wrong, but would also say that you should have been using the 3076 all along rather the 3071 for the upgrade kit

Ps: used a different desktop and could only see Red xs on the Garrett site so there does seem to be some kind of browser comparability issue out there


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