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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 09-26-2007, 03:06 PM   #1
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BOV and gas

Two unrealed questions. 1) I stil am learning as much as i can about saabs, but i heard that if you install a BOV on some cars it can cause the gas to be injected richer and causeing the cat to break down sometimes. I didnt know if this was true for saabs. I think it only aplies if the BOV is insalled after MAS. my other questions is about gas. The previous owner had always put regular gas in and i did the same, i am wondering if i should switch over and run mid grade. thanks. Sorry if i sound like a complete saab dumb ass
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Old 09-26-2007, 03:11 PM   #2
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What saab are u trying to put a bov on?
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Old 09-26-2007, 03:55 PM   #3
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98 900se turbo
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Old 09-26-2007, 04:11 PM   #4
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Here's a quick break down for you:

Trionic 5 (referred to as T5) uses a MAP sensor to measure manifold pressure , and you CAN use a BOV.
I believe that all the turbo NG900's are T5. So therefore, you CAN use a BOV with no problem.

Trionic 7 (referred to as T7) uses a MAF sensor to measure the air coming in to the engine, and a BOV CANNOT be used with it.

It all has to do with how the PCM measures the air coming in to the engine/intake manifold.

As far as gas goes, I'd put nothing but premium in it if you want the most out it. Lower octane gas will result in less efficient combustion leaving you with less performance and worse gas mileage.
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Old 09-26-2007, 06:24 PM   #5
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Yea 94-98 you are fine with a BOV, after the 9-3's all have T7 for the most part and you need to recirculate. I also second the nothing but premium, hell i throw a CEL when i run anything below 91.
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Old 09-26-2007, 06:27 PM   #6
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99 9-3 S and 99 9-3 SE are T5 and can use a BOV as well.



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Old 09-26-2007, 07:21 PM   #7
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Your car will learn to run on whatever gas you feed it. But for the best performance the higher the octane the better.
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Old 09-27-2007, 12:16 PM   #8
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If you don't have the funds, you can definitely continue to run regular. My previous owner did and I did for a while. I'm over 200k, so ... you make the call. I second what Tweek said.
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Old 09-27-2007, 12:22 PM   #9
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Yeah I only run the good stuff. I may lower the octane over the winter because will all this rain I have been getting a lot of wheel spinnage on good tires.
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Old 09-27-2007, 02:33 PM   #10
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Lowering the octane over the winter up here in the northeast is ok because of the lower ambient temps. With lower temps all around you can safely run lower octane gas because you have less risk of pinging/knocking/detonation. I still run 93 all year, because the Vig gets unhappy with 89.
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