Subject	That turbocharger is the Garrett GT2554R. It uses a
Posted by	Ash's Z on July 22, 2006 at 9:05 AM
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In Reply To	Quick question: what is the max psi for 530bb turbo can run posted by zyoulater on July 22, 2006 at 05:21 AM
Message	54.3mm GT25 compressor wheel, 60 trim, in a 0.80 A/R housing. The compressor map: Maximum pressure ratio is around 2.65, which makes a peak maximum boost of 23.93psi. (14.5 * 2.65) - 14.5 It will only achieve this boost level for a narrow range of engine RPM: around 4000RPM to about 5000RPM and the boost will fall (it will follow the very top contour line as engine rpm/airflow increases. Granted, Garrett has been known to fudge their compressor flow maps in such a way that the upper region is omitted, thereby giving a false image of what the compressor is capable of. They did this on the GT2860RS for some wacky reason - that "new" map shows the turbo only being able to produce 24-25psi of pressure but I have seen a peak of ~31.2psi in my personal Z, which is equipped with the same compressor section. The "old" GT2860RS compressor map is correct and the new one has a large region at higher pressure ratios omitted. Given that this map shows a 60% efficiency at that top line, I think it may be correct. This looks to be right given the efficiency that this size turbo operates at as it approaches surge/choke. Has anyone with Sport 530BB's been able to produce more than ~24psi? If so, this map is missing info. This is why it sucks when a manufacturer decides to "fudge" their datasheet information.... [ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
Follow Ups	Quick question: what is the max psi for 530bb turbo can run - zyoulater 05:21:33 07/22/06 That turbocharger is the Garrett GT2554R. It uses a - Ash's Z 09:05:50 07/22/06 >>> - ztunerz 12:48:21 07/22/06 what wastegates were on the gt28rs to get 28psi? (n/m) - EricTTZ 12:58:59 07/22/06 It's not about the wastegates. It's about the compressor. - Marshall 13:13:11 07/22/06 Additionally, it's about the VE of the engine. A high VE - Scotts94z32 13:19:00 07/22/06 2nd - aliaZ 17:03:37 07/22/06 Scott, I dont mean to rub you the wrong way here, so - Ash's Z 20:09:36 07/22/06 question >> - ztunerz 21:28:12 07/22/06 Those plots were just approximations based on what I - Ash's Z 04:05:07 07/23/06 Fair enough >> - ztunerz 08:22:13 07/23/06 What would be neat to see someone do is use the .86 - Ash's Z 13:30:58 07/23/06 hehe >> - ztunerz 21:10:52 07/23/06 Interestingly enough, exhaust manifold pressures aren't - Ash's Z 21:19:05 07/23/06 Just getting to this now, it seems I missed a lot over the - Scotts94z32 10:27:57 07/24/06 your still missing the big picture of VE - Seb (Specialty-Z) 03:06:51 07/23/06 It isn't about arguing, Seb. It is a matter of providing - Ash's Z 04:11:02 07/23/06 Seb: Here is a dynochart with your car, Dee's and my own: - Ash's Z 14:39:13 07/23/06 Did you just serve Seb? (n/m) - SpecNATT (Houston) 20:11:30 07/23/06 Well, I like Seb as well as Greg D - they are good guys. - Ash's Z 21:16:47 07/23/06 Please sit on your hands - SeedyROM 23:14:48 07/23/06 >> - ztunerz 21:14:32 07/23/06 P.S.There's another dyno floating around with Seb's 66xRWHP. (n/m) - Scotts94z32 14:00:05 07/24/06 pic - EricTTZ 01:03:02 07/25/06 It is easy to see how one could relate VE to peak boost. - Ash's Z 13:20:03 07/25/06 hmm... - aliaZ 19:04:38 07/23/06 Re: hmm... - Ash's Z 21:14:38 07/23/06 Re: Re: hmm... - aliaZ 21:42:05 07/23/06 The OEM 5speed housings are slightly smaller than the - Ash's Z 00:12:09 07/24/06 Re: The OEM 5speed housings are slightly smaller than the - aliaZ 11:00:32 07/24/06 Well, as I brought up before, using the term "VE" isn't the - Ash's Z 19:44:33 07/24/06 Also, something to consider Don. >>>> - Ash's Z 20:06:51 07/24/06 Re: Also, something to consider Don. >>>> - aliaZ 21:12:08 07/25/06 Re: Re: Also, something to consider Don. >>>> - Ash's Z 23:17:47 07/25/06 So people have been able to get higher - EricTTZ 11:22:48 07/23/06 forge 18 psi actuators (n/m) - ztunerz 17:20:56 07/22/06 That's because you modded without a clue. - Marshall 13:03:41 07/22/06 haha Ok my friend - you simply have NO clue - ztunerz 17:18:59 07/22/06 not sure if you were responding to my post or the - ztunerz 17:26:41 07/22/06 any improvement in spool/response with the forge actuators? (n/m) - PearlWhite300zx 14:27:50 07/22/06 yes somewhat but not that much better than the Hks - ztunerz 17:20:31 07/22/06 Yeah, something is wrong with that compressor map - Marshall 12:58:03 07/22/06 Re: That turbocharger is the Garrett GT2554R. It uses a - ouikikazz 16:45:34 07/22/06 I would say test the actuator it comes with first before - RAGTPZ 09:08:04 07/22/06 thanks for sharing, guys. Ragtpz, so did you use the - zyoulater 16:46:19 07/22/06 Correct, it is the original wastegate that came with the - RAGTPZ 19:35:07 07/22/06 Another question, setting the base psi has anything to do - zyoulater 16:48:10 07/22/06 explanaton >> - ztunerz 17:35:59 07/22/06 that's good info, ztuners. I am curious is there any - zyoulater 20:45:36 07/22/06 on the 530 bb turbos - no (n/m) - ztunerz 21:28:57 07/22/06 Please explain. - EricTTZ 13:29:57 07/23/06 if you tighten it too much - ztunerz 21:16:42 07/23/06 you will see 1.3 bar fading ot to 1.1 bar or so - ztunerz 17:25:05 07/22/06
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