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Thread: What is the best size for the WAI of my VE

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Posts: 21-28 of 28
2010-08-17 17:37:04
#21
Originally Posted by obewan
In theory the airflow through the maf should be proportional to the pipe sizes. Try just calculating the ratio and apply it to the voltages in the VQ table. Hint, the voltages will be quite a bit lower and you will loose resolution in the lower ranges.

Lets say that the original is 3 inches and the new one is 4 inches. The ratio is .5625 so the voltages would be a little more than 1/2 for the same flow.

To be more precise you should use the actual inside measurements from both pieces. Just remember that is proportional to the raduises squared.


This sounds so smart I want to test it.
2010-08-17 17:54:01
#22
I would too but my car is driving perfectly without figuring out any math lol
2010-08-17 18:26:31
#23
Originally Posted by blo0d
I would too but my car is driving perfectly without figuring out any math lol



thats because the ID of the pipe is about the same size as the ID the MAF. So there is no basic change.
2010-08-17 18:44:22
#24
Andreas - So in theory could you take apart a N60 or so MAF get a 3 inch intake setup/piping insert the MAF Element in the correct area and have it work fine for the most part?

Thanks,
Daryl G

PS :

I will be calling you soon for that DET info etc.
2010-08-17 18:45:45
#25
Nah miko, there's no way the ID of my ~2.75" ve maf is equivalent to that of my 4" custom maf intake pipe.

I said before the car wouldn't even reverse out the garage without dying a horrible death, with an unmodified vq table (crazy lean!). I fixed the problem by scaling the vq table until the a/f @ idle was similar to the 3" n60 maf setup I previously had.
2010-08-17 18:59:49
#26
Originally Posted by blo0d
Nah miko, there's no way the ID of my ~2.75" ve maf is equivalent to that of my 4" custom maf intake pipe.

I said before the car wouldn't even reverse out the garage without dying a horrible death, with an unmodified vq table (crazy lean!). I fixed the problem by scaling the vq table until the a/f @ idle was similar to the 3" n60 maf setup I previously had.



Thats not what I was saying. I am saying as long as the ID of the MAF and the ID of the pipe are the same there is no need to make any ECU changes.

I know you had to reprogram the ECU for the diffrent pipe size.

The pipe size diffrence you have is about 99% larger flow than the original pipe.
2010-08-17 20:27:16
#27
So if the id of the pipe the same size you can modify the MAF and just insert the element into the pipe which I believe is 3 inches? Any posts on this?
2010-08-17 22:45:22
#28
wouldt puttig the elemet i a certai legth play a big role too???
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