Raplacing the stock MAF question.

[stevehayes01]

Ok I was just thinking about MAF's on T-7 cars and it led me to another thought. On cars like Camaro's and Firebirds you can replace the stock MAF with a performance MAF. Has this idea ever been applied to the SAAB world? or is the T-7 programmed and tied to it's specific MAF device that is factory installed? Just a thought since other GM cars are able to use swappable MAF's maybe this can be something that can be explored for the SAAB motors.

Ok let's hear the thoughts on this one!

[Adrian W]

The stock MAF of the Saab is essentially identical to the stock MAF's on Camaro's and Firebirds of the same year. (They changed the design between certain years)

Either way, the stock MAF has a flow-chart all the way up to 800 hp or so. And most turbocharger inlets are 3" or smaller, so there isn't much need for a bigger MAF.

Still though, if you find a drop-in replacement for a Camaro or Firebird the same year as your Saab, it's possible it would work in the Saab as well. No way to know for sure without trying.

Adrian~

[stevehayes01]

Ok the MAF is not larger on the Camaro and Firebird's it is just recalibrated and programed to allow a higher unrestricted air flow reading. So if they can reprogram the MAF sensors to be computer friendly then why can't they do it with a SAAB MAF? I am not sure that I go along with the fuel map up to 800Hp on a stock MAF as then there would be no need to switch to a reprogramed MAF or after market one and in the v-8 world a performance MAF can mean 25 to 35HP in some cases with no other mods to go with it. So the jusry is still out on this one for me so far. :-?? :-?? :-??


Here is an example of a reprogramed MAF for a Camaro.
http://rksport.com/product/p_040935012/view_detail

[Adrian W]

Ok, it was more like 650 hp, but to be fair they don't state a limit for all of them. That's just how high the graph goes. Here ya go:



450 g/s = 59.5 lbs/min airflow.

Adrian~

[Adrian W]

Also, interestingly, I made a regression of the values our stock SAAB MAF uses (from the WIS), and it fits right along with the LS1 graphs.

I even plotted two different regressions so that you could calculate fueling up to any horsepower you wish.

The data goes as follows:

Hz = Flowrate in g/s

1045 = 1
1312 = 1.5
1527 = 2
2012 = 3.5
2355 = 5
2788 = 7.5
3134 = 10
3648 = 15
4075 = 20
4764 = 30
5289 = 40
5730 = 50
6114 = 60
6753 = 80
7286 = 100
7743 = 120
8158 = 140

Regression for flow 1-30 g/s: (2.092*10^-6)x^2 - .004537x + 3.838

Regression for flow 20-140 g/s: (4.757*10^-6)x^2 - .0291x + 60.267

The next two images show both regression curves plotted in two different frames. You can see that the curve which fits the data at low flow does not fit at high flow, and vice versa. 140 g/s is roughly 20 lbs/min airflow. These are just to show validation for the formulae.





Adrian~

[jperk]

Just curious....what is the diameter of the MAF for a T-7/Viggen. I know I'm lazy...just hoping someone had the info so I didn't have to check for my self

[stevehayes01]

I am going to measure the MAF on my 9-3 SE HOT today so I will tell you then but I believe it is around 3 3/4 inches or so possibley even 4 inches round. But I will post the results up after I measure it.

[ricot83]

it 3 1/8inches outer diameter

[stevehayes01]

There we have it then! No need to inspect it myself. Thanks ricot83!