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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 05-24-2009, 11:25 AM   #1
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Running Lean?

Ok so my friend has an identical ng900 to mine. Its a 1998 Saab 900se and it has a GS Intake and 2.5 inch Catback exhaust and a Viggen intercooler. He wanted to try my Nordic stage 4 tune in his car so i let him, but when we started driving around it boosted fine 22psi and ran good but it sputtered a lit bit at low rpms in like 3rd gear at 55mph like struggling to build boost and making a popping noise??? Then eventually after 65mph it would seem like its pulling like a bat out of hell. I looked at his A/f Gauge and it goes to lean at WOT??? Can someone tell me why?

Then to compare we tried my automotion ECU and it ran good. 20 PSI at WOT it went to rich on the Gauge. No sputtering or nothing. So I know nothing is wrong with his car. No check engine lights or anything some input please?
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Old 05-24-2009, 11:34 AM   #2
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wide band or narrow band?
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Old 05-24-2009, 11:37 AM   #3
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Narrow Band. I know they're not accurate but why would a Automotion Stage 2 say Rich and then Nordic Stage 4 Say Lean?
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Old 05-24-2009, 11:39 AM   #4
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doesn't a stage 4 require a 3.0bar fpr?
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Old 05-24-2009, 11:52 AM   #5
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Not that I know of. I checked the specs on GS.

Stg4 Hp 290 and 295 Tq
GS Sportcat/DP, Airfilter + Td0415t 5cm, Forge IC)
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Old 05-24-2009, 01:46 PM   #6
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while it isn't required might that be the reason it is lean though...? stage 2 to stage 4 is a huge jump. Plus as they are done by different tuners they may be programmed to run differently. in your car do they do the same thing? or have you tried them in something different..
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Old 05-24-2009, 02:44 PM   #7
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I have all the same mods except I have a 3" downpipe tdo4 viggen turbo. And mine even says lean under wot. ???
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Old 05-24-2009, 03:32 PM   #8
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Quote:
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doesn't a stage 4 require a 3.0bar fpr?
3.0bar fpr is stock
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Old 05-24-2009, 03:47 PM   #9
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sorry couldn't remember.
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Old 05-24-2009, 03:54 PM   #10
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Well anyways damnnn it. Any ideas saab linkers?!
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Old 05-24-2009, 04:18 PM   #11
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I have all the same mods except I have a 3" downpipe tdo4 viggen turbo. And mine even says lean under wot. ???
so...your putting a tune for a td04 in a car with no td04 and no 3 inch dp and your wondering why the A/F may or may not be off, since you really have no idea since your using what is basically a toy and has no bearing on what the mixture actually is?

this thread is full of fail...we need a facepalm smiley on here these days.



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Old 05-24-2009, 04:53 PM   #12
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so...your putting a tune for a td04 in a car with no td04 and no 3 inch dp and your wondering why the a/f may or may not be off, since you really have no idea since your using what is basically a toy and has no bearing on what the mixture actually is?

This thread is full of fail...we need a facepalm smiley on here these days.
idioso! It also reads lean on my setup to. Get your fucking eyes checked cause i think you need a huge fail sticker on your forhead between your eyes.
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Old 05-24-2009, 05:26 PM   #13
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good one

your still gauging this off a toy gauge that has pretty lights. its just showing you the voltage output of the o2, which is converted downstream by the ecu.

you have no idea if its actually lean or rich.

you also keep running ecu's on inappropriately/inadequately equipped setups...what did you expect to happen?



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Old 05-24-2009, 06:04 PM   #14
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maybe nordic tunes their ECUs to a different AFR?

cant a bad map sensor cause you to run lean?

widebands are cheapish, only 200$ adn they look sweet!
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Old 05-24-2009, 06:35 PM   #15
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I have a Wideband. Its going in tommorow with new o2 sensor so we will see the outcome.
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Old 05-24-2009, 10:24 PM   #16
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Yea, find out what it actually is reading before you make any assumptions.

The narrow band really is useless, I have seen them go inverted under extreme conditions and read rich when lean and visa-versa, I would not trust them in any way what-so-ever, its just a light show.

Check it with wide-band and see what ya got!

John
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Old 05-24-2009, 10:40 PM   #17
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How much hp is that stage 4 putting out?
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Old 05-25-2009, 08:10 AM   #18
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Old 05-25-2009, 08:34 AM   #19
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Yea, find out what it actually is reading before you make any assumptions.

The narrow band really is useless, I have seen them go inverted under extreme conditions and read rich when lean and visa-versa, I would not trust them in any way what-so-ever, its just a light show.

Check it with wide-band and see what ya got!

John
Holy crap. Inverted? :facepalm:

Here's what the response from a functioning narrow band looks like:
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Old 05-25-2009, 08:59 AM   #20
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how much hp is that stage 4 putting out?
290hp 295ft lbs. Torque
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