Subject	I can read the chart you posted of your car......
Posted by	Greg D. (Specialty-Z) on July 02, 2012 at 3:44 PM
	This message has been viewed 334 times.
In Reply To	Re: Apparently you don't know how to read a dyno graph. posted by Z_Pilot on July 02, 2012 at 12:05 PM
Message	That you posted here.... [ http://www.twinturbo.net/nissan/300zx/forums/general/view/2483988/Here-you-go.html ] It is true that lower timing helps spool, getting carried away with it is not our practice. The chart of Scott's car you pulled from our blog did not have any ignition timing change before and after, it was only cam timing. Here is another one with smaller turbos and cam timing change that a customer posted in this link.... [ http://www.twinturbo.net/nissan/300zx/forums/general/view/2501243/Adjusting-Cam-Timing---Results.html ] If you look at the rest of the blog's charts, or other charts our customers have posted, you will not find any charts from us that have lower timing causing the type of dip related to ignition timing as you find in your chart at 3700 RPM. If your thoughts are the same as rh_334 and you think a pair of turbo's the size of GT35R's used on a Z32 engine will not surge without anti-surge housings, you have a bit to learn. The higher the RPM, the more air the engine can pump through it, the lower the RPM, the more restriction. With the Automatic, the throttle is not lifted in the shift, so a blow off valve, or recirc valve, will not open as it will never see vacuum, it is always in high boost, and holding the valves closed with pressure. The amount of air these turbos are flowing at higher boost levels, at high RPM, is far more than the Z32 heads can move when the engine RPM is lower. When the trans shifts and lowers the RPM of the engine, the pressure increases because of the restriction of lower RPM pumping loss, this pushes air back against the compressor wheel and causes surge. The anti surge covers allow the pressure spike to vent to the inlet and recirculate. Steve car only drops to about 5000RPM in a shift, ignition timing would not be lowered that high up in the RPM band on a Z32 engine for spool, Steve is almost fully spooled by that RPM.
Follow Ups	Drag strip results. - Machtavian 22:43:01 06/30/12 Does he listen to his radio during the run? (n/m) - zgene4 22:53:13 06/30/12 I don't think so, his external fuel pump is very loud. (n/m) - Machtavian 22:54:25 06/30/12 LOL, I see why you asked that, his antenna is up. (n/m) - Machtavian 00:02:19 07/01/12 What was his best run? (n/m) - toykoz32 00:45:31 07/01/12 10.2 @139 low boost on the brakes - Machtavian 00:48:42 07/01/12 that is intense, surge or no surge. wow. (n/m) - evan_aggie(ATX) 01:20:44 07/01/12 Nice test runs :) How long before the setup changes occur? - samsung-Z [Houston] 09:15:54 07/01/12 Any engine pics available? Congrats on the runs!! (n/m) - TTZ2NV(EPTmotorsports) 09:41:52 07/01/12 Yeah - Machtavian 11:39:27 07/01/12 40% duty cycle~ 26 psi (n/m) - Machtavian 11:17:18 07/01/12 Wow! How does an anti surge housing work? (n/m) - Boosted1 09:29:40 07/01/12 At low RPM's, a smaller engine cannot use all the air that - JMW300ZX 10:03:09 07/01/12 Sounds like same function as Recirc valve. (n/m) - Boosted1 11:35:45 07/01/12 Yes, but in many cases the recirc valve cannot move all that - MixManMash 11:53:03 07/01/12 You just need bigger BOV's.... - Machtavian 12:25:45 07/01/12 I actually had BOVs and it was worse. I went back to stock - MixManMash 13:16:28 07/01/12 That doesn't make any sense, you may have had to - Machtavian 14:16:16 07/01/12 HKS SSQVs have no adjustment. The ports on them are smaller - MixManMash 18:29:34 07/01/12 You need 50mm Tial BOV's (n/m) - Machtavian 18:45:27 07/01/12 do the TIALs have a recirc option? - blackomega 15:45:27 07/03/12 You can get their Recirc BOV here: - MixManMash 17:51:55 07/04/12 You need to get your car together so you guys - The Hawk 13:17:09 07/01/12 Or - samsung-Z [Houston] 10:05:56 07/01/12 Re: Drag strip results. - rh_334 08:39:04 07/02/12 No, it's definitely surge... - Machtavian 10:07:55 07/02/12 27.3" tires made it worse - rated300zx 11:28:29 07/02/12 Apparently you don't know anything about who tuned the car. (n/m) - The Hawk 10:58:27 07/02/12 LOL, 2nd (n/m) - BigTDogg (MA) 11:42:02 07/02/12 Apparently you don't know how to read a dyno graph. (n/m) - Z_Pilot 11:47:40 07/02/12 Re: Apparently you don't know how to read a dyno graph. - Z_Pilot 12:05:21 07/02/12 His statement was: - The Hawk 15:23:30 07/02/12 I heard there is another post that Z1 needs your help. - HighPsi (NorCal) 15:43:17 07/02/12 Thank You! Some of these people amaze me w/ their BS! (n/m) - The Hawk 18:47:12 07/02/12 I can read the chart you posted of your car...... - Greg D. (Specialty-Z) 15:44:10 07/02/12 Very nice and informative explanation. - The Hawk 18:55:04 07/02/12 If in fact this is true, - Z_Pilot 20:27:23 07/02/12
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