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  #1  
Old 29th August 2018
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Default MAF flow rate

I was running my OBD II adapter and Torque Pro today just looking at some numbers.

Is a MAF flow rate of 171.7 g/s pretty standard for an '05 Aero?
Boost was 17.8 Psi and Intake was 31.8 Psi.

40-60 Mph was 2.6 sec (kick down with the auto in Sport mode).

I know in the 9-3ss forum someone had put what the stock MAF g/s max flow rate was (I don't recall what the number was though) but I haven't seen what it is for the 9-5's so figured I'd post and let others chime in.

I posted in here because I figured that this info would be more geared to the tuning side of things than the workshop side of things.
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  #2  
Old 31st August 2018
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I guess nobody knows?
The search continues...
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  #3  
Old 1st September 2018
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How much milligrams/combustion that weird g/s would be?
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  #4  
Old 1st September 2018
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How much information does the torque app show? I wanted to get open SID but it's too complicated for me.


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  #5  
Old 1st September 2018
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Quote:
Originally Posted by CdnSaab95 View Post
How much information does the torque app show? I wanted to get open SID but it's too complicated for me.


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It will show maf flow rate and everything else you want or need. I have the paid version. Well worth it!

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  #6  
Old 1st September 2018
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Originally Posted by Llwrider_rt2000 View Post
It will show maf flow rate and everything else you want or need. I have the paid version. Well worth it!

Sent from my 9-3


Does it matter which obd2 dongle you have? I see there's blue driver for $100 and another one for $26. Do they both read the same thing for the Saab TRIonic system?


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  #7  
Old 1st September 2018
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I paid $25 on eBay for mine

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  #8  
Old 2nd September 2018
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Quote:
Originally Posted by Mimmi View Post
How much milligrams/combustion that weird g/s would be?
171 grams per second.
I'm just curious as to what the stock flow rate should be.
I can change the readout to psi I think if that would make more sense. I recall in the 9-3ss forum they always talked about grams per second. I think it was 125 grams per second was stock flow rate. I could be off on that number though. Basically, they were saying if you were tuned, your flow rate would be higher than that. And if it was below that you should clean the MAF and replace the air filter. I just don't know what the flow rate should be on a 9-5 aero.
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  #9  
Old 2nd September 2018
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Quote:
Originally Posted by CdnSaab95 View Post
How much information does the torque app show? I wanted to get open SID but it's too complicated for me.


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It will show any data available from the ECU using the OBD protocol. Things like transmission temp aren't run through OBD so you won't see that. But there's still a ton of info through OBD.
Emissions readiness, 02 sensor voltages, cat temp, coolant temp, manifold pressure, boost level, etc etc.
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Old 3rd September 2018
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Quote:
Originally Posted by Nocturne View Post
171 grams per second.
I never looked that value, only milligrams/combustion.
Grams per second is not right in itself, because it depends on the RPM.
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  #11  
Old 4th September 2018
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Quote:
Originally Posted by Mimmi View Post
I never looked that value, only milligrams/combustion.
Grams per second is not right in itself, because it depends on the RPM.
Actually, I found a formula that checks out by using the grams per second.
Grams per second x 1.28 = whp.
So, 171 x 1.28 = 218 whp.
Add 15% for drivetrain loss (auto tranny) = 250 at the crank.

It refelcts what people had gotten at the dyno so there is good use for grams per second.
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Old 19th September 2018
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Quote:
Originally Posted by Nocturne View Post
Actually, I found a formula that checks out by using the grams per second.
Grams per second x 1.28 = whp.
So, 171 x 1.28 = 218 whp.
Add 15% for drivetrain loss (auto tranny) = 250 at the crank.

It refelcts what people had gotten at the dyno so there is good use for grams per second.
I'm going to try this formula today 🤔

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  #13  
Old 21st September 2018
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Quote:
Originally Posted by Llwrider_rt2000 View Post
I'm going to try this formula today 🤔

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How did you make out?
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  #14  
Old 21st September 2018
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Quote:
Originally Posted by Nocturne View Post
How did you make out?
Well....my Torque App said my MAF at one point was 193.6 g/s so times that by the 1.28 and I got 247.808 hp.

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  #15  
Old 21st September 2018
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Quote:
Originally Posted by Llwrider_rt2000 View Post
Well....my Torque App said my MAF at one point was 193.6 g/s so times that by the 1.28 and I got 247.808 hp.

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Linear? Are you stock or tuned? Auto or manual?
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Old 21st September 2018
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Quote:
Originally Posted by Nocturne View Post
Linear? Are you stock or tuned? Auto or manual?
It's an 05 9-3 Arc 5 speed manual. Stage 2 tune

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  #17  
Old 21st September 2018
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Quote:
Originally Posted by Llwrider_rt2000 View Post
It's an 05 9-3 Arc 5 speed manual. Stage 2 tune

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I'd say it pretty much checks out then. If you said stock, I'd be like, dammit! Gotta find a new formula. But stage 2 on an Arc, ya, it's pretty in line with those numbers I think.
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  #18  
Old 9th April 2019
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Quote:
Originally Posted by Nocturne View Post
Actually, I found a formula that checks out by using the grams per second.
Grams per second x 1.28 = whp.
So, 171 x 1.28 = 218 whp.
Add 15% for drivetrain loss (auto tranny) = 250 at the crank.

It refelcts what people had gotten at the dyno so there is good use for grams per second.
How does this formula check out though?
I've got a reading of ~ 1200 mg/c on esid for the 9-3 ss linear. 1200 mg/c = 240 g/s x 1.28 = 307.2 - 15% = 261.12

Therefore I'm getting 307.2hp crank and 261.12whp..? On a stage 1! @@
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  #19  
Old 9th April 2019
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Quote:
Originally Posted by Nordic-Machine View Post
How does this formula check out though?
I've got a reading of ~ 1200 mg/c on esid for the 9-3 ss linear. 1200 mg/c = 240 g/s x 1.28 = 307.2 - 15% = 261.12

Therefore I'm getting 307.2hp crank and 261.12whp..? On a stage 1! @@
I don't know what 1200 mg/c is, so can't help with that formula conversion.
And is that from the MAF?
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  #20  
Old 9th April 2019
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It's from air mass.
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