Garrett GTX Renesis anyone?
#28
Original Turbo 'd Auto !!
#32
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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
Maybe once the engine goes out I can sneak it in as part of the rebuild
#39
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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?
#46
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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.
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.
#47
Boosted Kiwi
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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 .
Last edited by Brettus; 11-15-2010 at 02:50 PM.
#48
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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.
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.
#49
Boosted Kiwi
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 ..
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 ..
Last edited by Brettus; 11-15-2010 at 05:02 PM.
#50
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
.
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
.
Last edited by TeamRX8; 11-15-2010 at 06:46 PM.