Subject	Steve has the larger exhaust housings on the shelf...
Posted by	Machtavian on July 04, 2012 at 12:33 AM
	This message has been viewed 317 times.
In Reply To	Why not go with larger exhaust housings? Should help shift posted by zxtuner161 on July 03, 2012 at 09:41 PM
Message	It would probably solve the little dip on the dyno but I don't think the engine would stop surging at the lower rpms when the auto shifts and forces the engine to move a ton of air that the heads can't move. You have to remember that it's an auto so when the rpms drop the boost pressure doesn't vent out of the manifold like a manual transmission. Plus, with the bigger housings he wouldn't even be able to get out of the hole without NOS. I remember when I had the sport 700's with the .86 housings it was incredibly laggy. Can you imagine how laggy a turbo this massive would be? The only way the bigger housing would work is if we go with the TH400 and a 6000 rpm stall. That will be the route we go if the SZ auto fails at higher power levels. We will be adding the anti-surge housings and change the shift points to where the engine will not fall below the surge line. I'm very confident that will solve the problem. It did when he was surging with his old 3071 set-up.
Follow Ups	GT35 Compressor Map Plot against dyno Chart - Greg D. (Specialty-Z) 21:18:37 07/03/12 Why not go with larger exhaust housings? Should help shift - zxtuner161 21:41:01 07/03/12 That is way to move the surge line, but your giving the - Greg D. (Specialty-Z) 21:58:55 07/03/12 And surging isn't? Lol. Can't have your cake and eat it too. - zxtuner161 22:01:59 07/03/12 Of course I want to find a way to have my cake and eat it! (n/m) - Greg D. (Specialty-Z) 22:17:27 07/03/12 Tial only offers the .63 and .82 A/R housings... - Machtavian 00:45:40 07/04/12 Steve has the larger exhaust housings on the shelf... - Machtavian 00:33:41 07/04/12 Thanks for the explanation! So are these snails just too big - marklar182 21:43:19 07/03/12 No, the turbines are mismatched for the motor. (n/m) - zxtuner161 21:53:07 07/03/12 Things that will help without increasing exhaust housings... - Greg D. (Specialty-Z) 01:24:25 07/04/12 Larger tubing on the exhaust manifolds & a better merge - induetime 11:28:20 07/04/12 Thank you very much for sharing that. (n/m) - Boosted1 21:47:36 07/03/12 Great explanation. So in essence, you don't think the - MixManMash 21:50:28 07/03/12 The issue with compressor surge is caused by back pressure - zxtuner161 21:59:37 07/03/12 At the cost of slow response with a turbo that size on this - Greg D. (Specialty-Z) 22:20:01 07/03/12 So this is mostly an issue being associated with the Auto? - 91300zxttkid 07:13:03 07/04/12 A manual trans will actuate the BOV/Recirc if you lift to - marklar182 11:20:28 07/04/12 I like the spool and personally would want to keep it.... - Greg D. (Specialty-Z) 22:14:21 07/03/12 That would be awesome to see. (n/m) - zxtuner161 22:27:13 07/03/12 So basically having some form of active control where you - MixManMash 22:54:53 07/03/12 Already running MAP (n/m) - Greg D. (Specialty-Z) 23:06:14 07/03/12 Stand alone? (n/m) - Piranha 02:46:55 07/04/12 +1, MAP owns MAF, the sooner the community catches up, - samsung-Z [Houston] 13:45:06 07/04/12 When do you plan on providing data to support your claims? - aliaZ 07:19:35 07/05/12 whoa - Greg recommending BOVs ? Now I have heard it all .. - The Devils Z 07:27:44 07/04/12 nothing wrong with BOV's IF they are bigger valves than - ztunerz 16:59:09 07/04/12 I'm thinking about getting these: - MixManMash 18:04:11 07/04/12 BTW, did you get the runfiles I sent you? - MixManMash 18:04:50 07/04/12 yeah got it, need to get everything on the same computer... (n/m) - ztunerz 20:45:05 07/04/12 Cool. (n/m) - MixManMash 23:38:53 07/04/12 Link inside >>> - ztunerz 22:10:10 07/05/12 Thanks for posting. This is food for thought for me. (n/m) - Inzane 00:31:33 07/07/12 what do you know ..like you work on Z's or something - The Devils Z 18:38:21 07/04/12 lately i feel i know very little. Things will turn around i - ztunerz 20:43:08 07/04/12 Makes sense. (n/m) - Boosted1 07:42:29 07/04/12 Great info Greg. (n/m) - sfarrah 23:31:20 07/03/12 Just put a little red nose on it and.... - RAGTPZ 23:47:51 07/03/12 That was a fun read, thanks! (n/m) - SeedyROM 03:09:34 07/04/12 Greg - what are your thoughts on the lag / response - The Devils Z 07:58:05 07/04/12 looking at my boost plot chart ..the difference is that - The Devils Z 08:08:14 07/04/12 Don't forget that this Z has a JUN stroker kit. The - MixManMash 08:49:27 07/04/12 thanks .. I forgot the details .. (n/m) - The Devils Z 10:57:31 07/04/12 i really wonder if it has to do with the 4mm stroke or the - ztunerz 20:46:27 07/04/12 I vote for neither - aliaZ 22:03:08 07/04/12 You think head work / cams would make the biggest difference - MixManMash 23:42:10 07/04/12 yes - aliaZ 07:13:33 07/05/12 Is the Crower crank using stock stroke? (n/m) - MixManMash 07:36:40 07/05/12 yes - aliaZ 07:45:14 07/05/12 good info! raising rev limit to drop into non surge zone? (n/m) - JaffaUK 15:36:25 07/04/12 I realized that the correction factors were not the same - The Devils Z 16:40:23 07/04/12 That dyno pull was at 4500 feet above sea level in Reno, NV - Machtavian 14:22:05 07/05/12 Re: GT35 Compressor Map Plot against dyno Chart - VERTTZ 08:38:32 07/04/12 Yes... - Machtavian 09:45:24 07/04/12 Electronically controlled BOV? - Zbullet 08:45:11 07/04/12 Great info Greg! Are there negative consequences to just - ConVerTT 13:35:34 07/04/12 In other words, is it terminal or just innefficient? (n/m) - ConVerTT 13:43:59 07/04/12 Damaging! High pressure surges are like a heart attack. - OverZealous (CT) 13:56:02 07/04/12
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