Stock MAF testing: Is it really restrictive?
#61
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Originally Posted by MR
can i say by assumption that the MAF can handle up to 450HP on the engine?????
#62
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I think some people are confusing "Vacuum" with the sucking motion of the turbo injesting air. This is not the case as the air entering the turbo is at 14.7 psi of pressure on a standard day. A TRUE vacuum is a lack of any air....
#63
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Originally Posted by KazzEvo8
I firmly believe there is no vacuum until there is restriction. However, I'm no scientist. Why don't one of you industrious scientists rig up a similar test using a vacuum cleaner?
Originally Posted by CirruslyEvolvd
I think some people are confusing "Vacuum" with the sucking motion of the turbo injesting air. This is not the case as the air entering the turbo is at 14.7 psi of pressure on a standard day. A TRUE vacuum is a lack of any air....
There should be a pressure drop with, or without, restriction. If a device does not measure any, it is not sensitive enough, not placed correctly, or not functioning.
#64
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Originally Posted by SaabTuner
There should be a pressure drop with, or without, restriction. If a device does not measure any, it is not sensitive enough, not placed correctly, or not functioning.
Dave
#65
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Originally Posted by MR
can i say by assumption that the MAF can handle up to 450HP on the engine?????
I'm glad I looked this up, it's encouraging news. I was hoping to stay on the stock MAS as long as possible.
#66
Originally Posted by djh
Yeah, there has to be some. Just as current flows due to a potential difference, fluids flow due to a pressure difference. But the tests your friend did with his Viggen show that, at least up to some point, details of the intake just don't matter.
Dave
Dave
#68
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This is not a hard debate... it is a restriction... plain and simple.
Can you see anything inside the hole... yes (A large honeycomb). Is the turbo fluted straight to the atmosphere... no.
Now does it cause a series HP loss... most likely not at any level it can read accurately to.
I crushed mine from vacuum and my car is most likely in the 550 hp range.
If someone wants to send me a decent electronic sensor (Preferably 0-5 volts) that can measure in/mg accurately down to say 1/10 of 1 in/mg I would love to test the actual vacuum and post it up with and without the MAF. I will do so at boost starting at 20psi and do more and more tests up to 35psi of boost.
Also, for those that dont think a tiny restriction could matter, well it does. Mainly because you are compressing that air... minus a small amount in front = alot in back.. it gets multiplied. On top of that, it pushes the turbo farther into its effective range (RPM) because it needs to spin faster to hold the same amount of boost).
Can you see anything inside the hole... yes (A large honeycomb). Is the turbo fluted straight to the atmosphere... no.
Now does it cause a series HP loss... most likely not at any level it can read accurately to.
I crushed mine from vacuum and my car is most likely in the 550 hp range.
If someone wants to send me a decent electronic sensor (Preferably 0-5 volts) that can measure in/mg accurately down to say 1/10 of 1 in/mg I would love to test the actual vacuum and post it up with and without the MAF. I will do so at boost starting at 20psi and do more and more tests up to 35psi of boost.
Also, for those that dont think a tiny restriction could matter, well it does. Mainly because you are compressing that air... minus a small amount in front = alot in back.. it gets multiplied. On top of that, it pushes the turbo farther into its effective range (RPM) because it needs to spin faster to hold the same amount of boost).
#70
just the mass amount of air passing by the hole in the intake will make a vacuum of some measurement. The valve cover breather line to the intake creates a little vac. every car that i have modified with the stock intake sucks oil into the intake and once i remove the line and replace it with a little K&N breather, oil stops coming out of the little breather what was moving the oil? the vacuum.
#71
Originally Posted by jj_008
I don't know how many hz I am at, but according to my XEDE, I am at 95% of its reading ability at 34psi. My RX6 turbo moves around 60-65lbs/min of air.
Some of us DSMlink users jack the evo mas for its higher metering (about 20% greater than a stock 2g mas). It has been logged at 62 lb/min of airflow with no signs of over run. They are pretty close to being maxed out at that level.
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