 Weber IDF Jetting |
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| euro911 |
 Aug 14 2017, 04:31 PM
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#21
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Retired & living the dream. God help me if I wake up!  Group: Members Posts: 8,845 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California 
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Quit brow-beating the new guys, Mark (IMG:style_emoticons/default/poke.gif)
(IMG:style_emoticons/default/laugh.gif) Innovate LM-2s aren't that expensive if you shop around ... http://www.ebay.com/itm/Innovate-LM-2-Digi...8oT&vxp=mtr |
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| FastFroggy |
Aug 14 2017, 05:13 PM
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#22
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Newbie Group: Members Posts: 36 Joined: 27-November 15 From: Ann Arbor MI Member No.: 19,415 Region Association: Upper MidWest |
(IMG:style_emoticons/default/blink.gif)
I understand the consensus ( for overall sizing is 40mm max). In order to do the road tuning thing, I will need an O2 sensor even if I had 40mm. Budget and time limited for the time being. As for the technical feedback, Bernouli's equation defining air flow although a first principles estimation, is not invalidated because we are talking about a VW engine. I am only interested in tuning my car for track use. Yes, 6800 rpm is per tach(i know this is not entirely accurate). This is just a sizing calc point. And yes I threw off the alternator belt that was on the car when I bought it. Not having that problem since I put a new one on. eye candy..... (IMG:http://www.914world.com/bbs2/uploads_offsite/img.photobucket.com-19415-1502753556.1.jpg) |
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| ChrisFoley |
Aug 15 2017, 07:05 AM
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#23
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I am Tangerine Racing Group: Members Posts: 7,909 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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Keep the 44s. Don't expect good performance below 4500 rpm. Anything you do to make the engine work better down low will only hurt the top end.
I run 40s because of SCCA rules but I use 36mm venturis and made a lot of mods to the carbs to improve flow at WOT. |
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| ChrisFoley |
Aug 15 2017, 07:17 AM
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#24
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I am Tangerine Racing Group: Members Posts: 7,909 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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Depending on your specific engine build you may even want to increase the venturis to 38mm. I've used 37.5mm vents in my 40 IDFs but that's nearly a straight tube in a 40mm carb body.
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| stugray |
Aug 15 2017, 10:04 AM
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#25
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE(FastFroggy @ Aug 13 2017, 09:17 PM)  If it continues I'm out. I was going to help as I have A LOT of experience (not NEARLY as much as McMark) in this department since I have a 2.0L race car with dual webers and ~30 years experience with carbed 914s But based on that comment I would not want to hurt your overly sensitive disposition. Figure it out yourself. |
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