Do I Need an A/F Gauge?? - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 09-24-2007, 11:36 AM   #1
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Do I Need an A/F Gauge??

I would like to get a MBC+A and through searching have discerned that I will need a boost gauge, but do I also need a A/F ratio gauge as well??? I've got a 99 9-3 HOT, btw.

Also where can I get some aluminum 90 deg bends for my DIY intake? Any ideas???

Thanks for the help!!
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Last edited by Passenger 57; 09-24-2007 at 01:15 PM.
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Old 09-24-2007, 11:43 AM   #2
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You should get a boost gauge if you increase the boost above stock.

If you are going to get an A/F gauge (you don't for an MBC+A) save your pennies, and get a wideband A/F gauge. They are about 200+ dollars, and not really needed unless you are doing some serious tuning.

As for the bends, I was in a checker auto on Larpenteur last week, and they had a section for building your own intakes, with clamps and mounts and junk.
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Old 09-24-2007, 11:47 AM   #3
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Not sure what model you have.. But you really dont need the a/f gauge for a boost controller. Saabs have a safety fuel cut built in. So the engine management wont let the engine lean out in that regard.
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Old 09-24-2007, 12:35 PM   #4
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A narrow band air-fuel gauge certainly won't hurt and is much better than nothing.
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Old 09-24-2007, 12:39 PM   #5
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Yeah, but at this point 50 bucks is best spent on something else...

Like a spare DI or a Drop-in filter.
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Old 09-24-2007, 12:59 PM   #6
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Narrow bands arent anything more than a lightshow. Dont waste your money until you can afford to buy a wide band and do some serious tuning. They will only show the extremes of your a/f range and aren't accurate at all. Besides with stock engine management you wont lean out at 15.5 psi.
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Old 09-24-2007, 01:15 PM   #7
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Thanks for the info guys
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Old 09-24-2007, 01:34 PM   #8
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The problem with a narrowband is that it can only tell you whether your AFR is above 14.7:1 or below (lambda 1). That's it. If you're trying to tweak your idle it would be useful, otherwise it won't tell you anything meaningful because it can't.

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Old 09-24-2007, 02:31 PM   #9
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Ive had mine since before I got a new ECU...Stage 3 and Stage 4...I have used it ummm....never. Even an EGT gauge will be much more usefull than your standard A/F gauge.

Get a K&N panel filter and then mod your intake box with a 3" tube for the same money. Will be much better with the MBC+A.
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Old 09-24-2007, 03:36 PM   #10
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You don't need a boost gauge either, contrary to popular belief.
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Old 09-24-2007, 04:11 PM   #11
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Quote:
Originally Posted by Red DIC View Post
You don't need a boost gauge either, contrary to popular belief.
Yeah you dont NEED one, but tuning an MBC+A on a car with a real boost gauge (mine) and a friends who didnt have one at the time seemed the same till our butt dyno failed cause when I installed a boost gauge on his car his peak boost was only about 13psi. I retuned it to peak performance after that, but actually knowing real numbers is much better when tuning.
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