so how do g/s numbers on a VAG log equate to HP?
11-14-2005, 09:48 AM
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so how do g/s numbers on a VAG log equate to HP?
I know (g/s) / 0.8 gives you ~HP, but...
How? I'm looking for a pretty technical response, maybe starting with how it obtains the g/s measurement and why the constant is 0.8...
Would really like to know, thanks
How? I'm looking for a pretty technical response, maybe starting with how it obtains the g/s measurement and why the constant is 0.8...
Would really like to know, thanks
11-14-2005, 09:50 AM
#2
ask Andy@vag-com
from his <a href="https://forums.audiworld.com/vag/msgs/456.phtml">post</a>.
<i>Here's a good sanity check for the status of your MAF. Do a full-throttle run all the way to redline in a single gear (second works fine). Group 002 usually shows air mass in g/s. <b>Your peak airflow should be roughly 0.80 times your horsepower.</b> So, if you have a stock 150 hp 1.8T, expect around 120 g/s. If you see significantly less than that, you MAF may be on the way out. This still works if you are chipped, but "race" programs may make more power through timing, rather than airflow. Therefore, take all readings with a grain of salt.</i>
<i>Here's a good sanity check for the status of your MAF. Do a full-throttle run all the way to redline in a single gear (second works fine). Group 002 usually shows air mass in g/s. <b>Your peak airflow should be roughly 0.80 times your horsepower.</b> So, if you have a stock 150 hp 1.8T, expect around 120 g/s. If you see significantly less than that, you MAF may be on the way out. This still works if you are chipped, but "race" programs may make more power through timing, rather than airflow. Therefore, take all readings with a grain of salt.</i>
11-14-2005, 11:34 AM
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HP --> MAF reading, but not MAF reading --> HP
That's how I understand it.
So, this relationship works only one way, i.e. knowing the HP of your engine you can guess how high a good working MAF can read.
However, it doesn't mean that you can calculate your HP from the MAF reading.
Think about it: MAF just shows how much air passes through. Is it possible to pull the nominal amount of air but still not making enough HP? I think so.
Agree? Disagree?
So, this relationship works only one way, i.e. knowing the HP of your engine you can guess how high a good working MAF can read.
However, it doesn't mean that you can calculate your HP from the MAF reading.
Think about it: MAF just shows how much air passes through. Is it possible to pull the nominal amount of air but still not making enough HP? I think so.
Agree? Disagree?
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