Restriction Performance on a RallyBob Intake

[Mark K]

I just came back from the Opel Nationals at Lowes Motor Speedway in Charlotte, NC, and it reminded me about some testing I had done years ago on my intake which I modified to RallyBob's design. At my old job I had "access" to some pretty darn good flow testers and I tested a stock intake manifold vs my modified intake. Attached is a simple chart, and although the numbers don't seem like much, trust me, it doesn't take a lot of inches of restriction to improve performance. Also, realize that the numbers also include the restriction of the test set-up I had to make in order to conduct the testing, so understand that they are just numbers, but the comparison is what counts. Just let me know if you cannot view the file.

[wrench459]

Mark
Can you translate to gps numbers?
Why I ask is this is my defaut measurement.

[tomking]

In this case lower restriction numbers are better. Its the opposite of measuring flow rate; flow rate higher is better.

[wrench459]

After playing around with the 200 cfm numbers. I can see how this is a art form. Same engine,rpm's and air temp with very different results. I really need to do more baseline testing.

[wrench459]

Got some of the hardware installed tonight. At the bear minimum I was hoping for a 100 gm/sec. run.
I went over the 3.0 volt range with the maf sensor.
The only thing I don't understand is the massive reversion in the mid range.
Sorry I cant post pictures.. some clown forgot the A/C adapter, tomorrow is another day. Theres got to be a correlation with the flow bench!

[wrench459]

http://s250.photobucket.com/albums/g...Opelmafrun.flv

Nice reversion pattern. The 3 volt mark is 200 cfm.
This is a pull from idle to 6000prms though three gears.