volumetric efficency of the 4G64

[talonted_one]

I was trying to do some calculations for turbo sizing and efficency.(I'm bored)

I was wondering if anyone knew what the volumetric efficency of the 4G64 is or how to find the information?

 

[kpt4321]

I have found that the best way to pul VE numbers is by looking at a dyno chart of a stock or lightly modified motor. Or, if you can find one, look for a dyno chart of a motor with the same mods as you.

Then, you have to run some numbers to figure out the airflow (because airflow correlates directly with hp) and when you find the airflow, you can find the VE.

With stock cams, I have found VE on a 63 or a 64 to be approximately as follows:

4000 - 105%
5000 - 105%
6000 - 95%
7000 - 73%

Now, that is just an approximation, so let's not have anyone come in here yelling at me. I realize it is not perfect, but if you plug in accurate boost, compressor efficiency, and intercooler efficientcy numbers, you will get reliable flow and power outputs.

I have made up a cool spreadsheet that allows me to plug in displacement, VE at several rpm points, boost, CE, IE, intake temp, and a couple other things, and it will give you the flow rate and the approximate power output at those rpms.

Good stuff.

....Kyle T.
93 TSi AWD "TURBO4"

 

[DSM mechanix]

Originally posted by kpt4321
I have made up a cool spreadsheet that allows me to plug in displacement, VE at several rpm points, boost, CE, IE, intake temp, and a couple other things, and it will give you the flow rate and the approximate power output at those rpms.

Mind posting that up?

 

[talonted_one]

yeah kyle I would like to have that spread sheet too if you dont mind. and thanks for the input.

 

[kpt4321]

It is in excel format, what would be the best way for me to get it out?

...Kyle T.

 

[DSM mechanix]

Put it up on your web-site and post a link here

 

[BoostinAWD]

Yea that would be great

 

[talonted_one]

or you could email me and I will post a link on my site.

[email protected]

 

[kpt4321]

You should be able to right-click and save as the following link:

{technical difficulties, bear with me}

If not, let me know.


....Kyle T.

 

[talonted_one]

still waiting

 

[talonted_one]

well its uploaded to my sites tech page but I am having issues trying to download it so I will be working on it.

thanks Kyle

 

[kpt4321]

See? It's not as easy as you would expect.

The problem I had was, whenever I dropped it on my server with a FTP program, the file size would drop to 0 bytes. So, it was there, but it...wasn't. Weird.


....Kyle T.

 

[talonted_one]

well I am having a different problem... I will sucessfully uploaded to the server and put in the appropriate tags. The problem is when i test it to see if anyone can DL it, I get a server error saying you cant DL mpeg or avi files. The extension clearly says .xlr.