Subject	Yeah, something is wrong with that compressor map
Posted by	Marshall on July 22, 2006 at 12:58 PM
	This message has been viewed 176 times.
In Reply To	That turbocharger is the Garrett GT2554R. It uses a posted by Ash's Z on July 22, 2006 at 09:05 AM
Message	I made a post a while back talking about turbos, and if you do the math, according to that compressor map the turbo cannot make as much power as people are getting with it in real life. Also, according to that map, the compressor is sized wrong for our engine. The efficiency falls way off before our engine hits redline. It's too vertical, and is optimized to make a lot of boost at a low rpm. Even if you calculate what it would take to hit 450 rwhp, that turbo isn't a good canditate. But real life seems to play out differently than what that map would indicate. Actually, if that map were correct, JWT's name would be pretty accurate, since according to the map they'd be good for about 530 hp at the crank.
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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