Subject	Interesting that mafs are supposed to "accurately" measure
Posted by	ztunerz on June 09, 2011 at 12:57 AM
	This message has been viewed 391 times.
In Reply To	FYI only - if you make changes to the intake system posted by The Devils Z on June 09, 2011 at 12:00 AM
Message	Air flow yet in this case we see see that the car gets leaner with bigger inlet piping. Efficiency is well and good but the maf should measure the extra air since it "should" supposedly flow thru it and it is supposed to be a closed system unless there is a vaccum leak pre turbo which allows air to be sucked in. I am quite sure you did a boost leak test no ? Harry Formerly yellowzxtt
Follow Ups	FYI only - if you make changes to the intake system - The Devils Z 00:00:02 06/09/11 Interesting that mafs are supposed to "accurately" measure - ztunerz 00:57:42 06/09/11 but if the MAF only meters air and therefore only - ForceFedTT (SoCal) 02:42:35 06/09/11 Well... - kickerzx 04:36:18 06/09/11 maf systems "shouldn't" need to know VE (n/m) - Antihero 11:37:37 06/09/11 They do need to know the diameter of the tube they - BigTDogg (MA) 11:52:06 06/09/11 and why do you think that is changing :) (n/m) - ztunerz 12:38:48 06/09/11 On Z's it doesn't, other cars with a dip-in style meter - BigTDogg (MA) 12:57:12 06/09/11 thats my point VE "should" have no impact on a MAF >> - ztunerz 12:40:21 06/09/11 ummm think again, maps are already scaled (n/m) - ztunerz 12:38:06 06/09/11 Doesn't the ECU run open loop under WOT? if that's the case - MixManMash 08:35:46 06/09/11 AFAIK open loop means the ECU ignores the O2 sensors output, - Inzane 09:29:32 06/09/11 Brain fart. Right, which means there would be no way for - MixManMash 12:15:29 06/09/11 open loop refers to O2 sensors - aliaZ 09:35:22 06/09/11 Ahh yes. Excuse the morning brain fart. (n/m) - MixManMash 12:13:46 06/09/11 Due to saturation of the signal, recal. is recommended (n/m) - RevTech 10:42:47 06/09/11 LOL sounds like a Mitch comment - vague and... (n/m) - ztunerz 12:41:17 06/09/11 The scale saturates easier with the added air Mr. Harry (n/m) - RevTech 15:04:11 06/09/11 lol (n/m) - aliaZ 18:27:26 06/09/11 What is this statement supposed to mean? (n/m) - Jeffblue 15:45:20 06/09/11 It means the cells accessed reaches the right side - RevTech 17:03:15 06/09/11 So you are saying the maps are not fully expanded - ztunerz 17:12:08 06/09/11 Harry - you actually already have my bin. Using "add mode" (n/m) - The Devils Z 17:50:01 06/09/11 Good point. A sneak at the bin will help. - RevTech 18:34:41 06/09/11 I noticed that after installing my selin kit my af did the - MikeVar82 06:39:07 06/09/11 getting closer... (n/m) - ztunerz 12:41:53 06/09/11 Closer to what? is it normal or not? (n/m) - MikeVar82 16:00:30 06/09/11 It shouldn't be... - Jim (Selin Design) 16:33:56 06/09/11 Nope just direct swap from single to selin. nothing else - MikeVar82 16:40:11 06/09/11 How much of a change did you see? - Jim (Selin Design) 18:16:44 06/09/11 About the same as OP. 11.6 to 12.6 -.8 - MikeVar82 19:03:05 06/09/11 Hmmm thats quite a change... - Jim (Selin Design) 11:58:06 06/10/11 When I installed my selin kit .. Before and after - The Devils Z 17:44:10 06/09/11 More questions - ztunerz 16:52:33 06/09/11 yes, 13-14 psi, i wanna say 14-15 i think - MikeVar82 16:56:29 06/09/11 Do you have a datascan cable ? - ztunerz 17:01:13 06/09/11 Dont have datascan cable. ill check the voltage. (n/m) - MikeVar82 17:04:07 06/09/11 ... or get a SZ custom tune after install :D (n/m) - vorpalZ 12:20:17 06/09/11 Hopefully not necessary. - Wright (Ca) 13:14:25 06/09/11 "pretty good job?" Hmm...not sure I want "pretty good" - ForceFedTT (SoCal) 15:22:48 06/09/11 I said "good" not "pretty good". (n/m) - Wright (Ca) 18:22:16 06/09/11 What type of mods necessitate an ECU re-tune? (n/m) - OverZealous (CT) 21:38:07 06/09/11 Have you corrected back to 11.5 using Nistune? (n/m) - jschrauwen 14:19:26 06/09/11 not yet --after speaking to Ztuner today, I am going to - The Devils Z 15:36:30 06/09/11 A Boost leak would render a rich condition. - MixManMash 17:24:55 06/09/11 He will have to pressurise the entire intake tract to - ztunerz 17:34:22 06/09/11 I was speaking more technically. I understand what you mean - MixManMash 11:03:40 06/11/11 Negative. >>> The beauty of MAS-based EFI systems <<<< - Ash's Z 02:55:50 06/10/11 question - so what you are saying is that based on your - The Devils Z 09:35:17 06/10/11 For the most part, that is correct. When you also have to - Ash's Z 10:48:59 06/10/11 .. so I have some checking .. (n/m) - The Devils Z 17:40:10 06/10/11
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