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: MAF bored. Which changes need to be done? src 06-09-2006, 03:55 AM Hello! I have a bored to 54mm MAF for my 100NX GTi. What changes I need in my ECU program? Just change "K" constant, or I need to modify VQ map? Thanks! Greg Amy 06-09-2006, 07:03 AM Well, if you're MAF is bored, just give it something to occupy its mind for a while. TV or Internet access usually works... JayLew 06-09-2006, 08:30 AM Just the K value. If you have access to a wideband then you might want to make sure you AF's are still correct at lower rpms. src 06-10-2006, 10:48 AM Grega, ha-ha. :thumbsdown: I like to hear how you will speak Russian. :rofl: src 06-10-2006, 11:10 AM Calum, I want to hear your opinion! 54/50=1.08 So I must multiply the "K" value by 1.08, right? Calum 06-11-2006, 01:15 AM I like Greg's suggestion. :p I don't remember off the top of my head. Search in this forum for a post by Jrios, he documents in a thread the right k-number to use. Its a really old post. src 06-12-2006, 04:45 AM Hm.. How he found 1.05 multipler? exxd 06-12-2006, 12:18 PM Shouldn't it be 1.16? JRios 06-12-2006, 12:33 PM This is the thread Calum is talking about, http://www.sr20forum.com/showthread.php?t=98100 Now, keep in mind that the size of the maf that I was trying to do is 53.5 mm. I still have not tested this theory due to extreme lack of time. So keep in mind, like I said in my post, it has to be tested. exxd 06-12-2006, 12:54 PM Bored MAF: Area of a circle: pi * r^2 Area of 54mm maf: 2290.22mm Area of 50mm maf: 1963.49mm 2290.22 / 1963.49 = 1.1664 The 54mm maf is 16.6% larger then the 50mm maf. src 06-13-2006, 04:54 PM Yep, I think the same manner. And as we can found here: http://www.sr20forum.com/showthread.php?t=149465 SR20DE MAF 91-94 Sentra SER, part # 53J00 50mm 250 WHP-----------Bored 54mm 290 WHP 290 / 250 = 1.16 | ||