Subject	comparing compressor maps doesn't tell the whole story
Posted by	aliaZ on January 17, 2011 at 11:45 AM
	This message has been viewed 317 times.
In Reply To	Comparing EFR6758 to GT3071 compressor maps. posted by FuerGrissa on January 17, 2011 at 05:09 AM
Message	The efficiency of the hot side can have a big impact on back pressure, which changes the engine volumetric efficiency. The GT3071-WG essentially uses a clipped turbine wheel to fit inside the T25 turbine housing. The T3 GT3071 uses a 60mm turbine wheel. This wheel is clipped to 56.5mm to fit inside the T25 housing. The EFR series turbines are supoposedly very efficient and very well matched to the compressor wheel, which reduces back pressure. I'm told EFR turbos run a 1:1 ratio of boost to exhaust back pressure through the intended boost range, but I don't know this first hand. Garretts run 1.6:1 to 3:1 from what I hear from the guys at SZ. It is a monster of a turbo...it remains to be seen if it will fit or not. Custom WG brackets will also be required.
Follow Ups	Comparing EFR6758 to GT3071 compressor maps. - FuerGrissa 05:09:59 01/17/11 Also worth noting - FuerGrissa 06:24:39 01/17/11 >>> - ztunerz 09:56:00 01/17/11 something like this? - FuerGrissa 14:39:23 01/17/11 Pay the extra $500. FYI: I normally don't say that. - evan_aggie 07:56:14 01/17/11 That's not really what this post was about - FuerGrissa 14:42:31 01/17/11 I'm no expert but they look pretty close. - ZXoltan 09:18:04 01/17/11 The EFR and GT are two totally different classes of turbo. (n/m) - ZiNnYc 09:19:45 01/17/11 Garret map says GT3031r. Are you comparing the correct map? (n/m) - Zwin 10:37:33 01/17/11 It came from ztechz.net, sparkie's site - FuerGrissa 14:07:08 01/17/11 It's a typo - sparkie 23:49:20 01/17/11 That's caused by... - sparkie 10:38:34 01/17/11 comparing compressor maps doesn't tell the whole story - aliaZ 11:45:25 01/17/11 Gonna finally go drop off the parts today. (n/m) - collegeboy 12:22:36 01/17/11 I didn't look on the garrett website.. - KongZTT GT28RS MD 12:39:57 01/17/11 Re: I didn't look on the garrett website.. - aliaZ 17:51:57 01/17/11 haha.. I love how you are always so detailed.. - KongZTT GT28RS MD 18:05:23 01/17/11 Re: haha.. I love how you are always so detailed.. - aliaZ 19:58:30 01/17/11 If the pressure after the compressor turbine was the same as - turtleboy 13:23:26 01/17/11 I think he is refering to the amount of pressure it - KongZTT GT28RS MD 14:00:10 01/17/11 yep (n/m) - aliaZ 16:12:33 01/17/11 Thanks, I figured I was missing part of the story. (n/m) - FuerGrissa 14:44:49 01/17/11 i really want to try the 6255 turbo, looks like - ztunerz 17:05:27 01/17/11 Where do you get these turbos? Who makes em? (n/m) - ZXoltan 18:28:04 01/17/11 Ummn borg warner makes them, same line as above (n/m) - ztunerz 21:10:26 01/17/11 Link >>> - ztunerz 21:16:27 01/17/11 I've seen a dyno of a 6255 and a 6258 - aliaZ 21:50:48 01/17/11 Link, pic, vid of this dyno? - dogpile 10:47:35 01/18/11 Wow that makes little sense (n/m) - ztunerz 19:02:21 01/18/11
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