Wrong test. Do a pull open. Then do a pull closed. Lay the plots on top of each other. Your switch point is where the lines cross.

And... would the supercharger would generate less heat for the same amount of air?

hmm this is interesting, can't wait to see results

Will this testing include an unmolested JDM/sqare top manifold ?

Any interest in tackling a Honda/Mazda hybrid manifold?

Puke

details please:

how are you controlling the valve? [by either opening or shutting the vacuum to the actuator or by switching a solenoid that controls the vacuum]

what is the switch over point? [rpm, vacuum, or both]

TIA

This is a good test, but I know what rpm to transition the manifold at. I just want to know what the power difference would be.

Valve control:
I have a vac line, passing thru a 1 way valve, to an accumilator(I am using a small fuel filter). This gives me a steady vac source. This goes to a 3 way valve, which came off a stock Miata. The common port of the valve goes to the vac actuator on the manifold. The other port on the valve is vented to atmosphere. (I'll post a pic, but have to head out of the house now..)

My test shows you precisely what the power difference is when you compare the 2 plots. Showing the ideal switchpoint can be considered a side bonus.

Just wondering if 01 Euro means square top. They are so hyped now that it's about time someone did a proper dyno comparison.

Here is the valve and associated components to control the IM actuator. The IM actuator, needs to have vacuum to close the IM plates, and no vacuum to open them. The clear hose goes to the air filter. When the valve is unpowered, this port is connected to the IM actuator. The one way valve (green/white) is connected to a vac source, and then an small fuel filter, which stores vacuum. The vacuum storage may not be necessary, however I added it, to ensure that there was always plenty of vacuum available...

https://www.miataturbo.net/attachmen...ine=1320924352


Both methods do precisely that. Here is what you would see using each method.
https://www.miataturbo.net/attachmen...ine=1320924352

To reverse the action of the valve, I just need to tick a box in the MS software, to reverse the polarity of the valve control signal. I also need to have a different VE table for the different settings of the IM actuator, otherwise the car will run rich which will make the test results not comparable.

If I had one of these, I would first put it on the car, and determine if it was flowing better. With an aftermarket computer, you can see how much extra fuel (VE) you need to add, to maintain the same AFR. By looking at amount of additional fuel you need to add, you can determine if you should be seeing a power gain worthy of taking it to the dyno.... Othewise, you could be spending $$, used better elsewhere.

very helpful info - thank you - from your posts I gather that you are switching [closing?] the butterfly valves at about 2500 rpm; was that just an arbitrary selection or based on some fact-base info - looks like the VE adjustment method could also be a way to determine the switch point

We have been doing some reading up on it and playing with some we have in stock here...do you just need one ported or looking at making the hybrid?

-Sam

Here ya go bitzchezzz

http://www.flyinmiata.com/tech/dyno_runs/99_050400.pdf

Green would be closed, blue would be open, and red would be the combo.

so

< 3500 rpm = green, closed
3500 - 5500 = blue, open
5500 < = green, closed

wonder if adding the 3-dimension [vacuum] has any impact?

I'm assuming the difference on a turbo motor would be much bigger. This is the stock vics manifold btw, not gutted.

Just ported, the halves are already joined. Porting would be an especially good idea in this case since there is a definite obstruction at the splice.

Awesome work, can't wait to see the results. What kind of cost and turn around would it take to get a manifold ported like that?

There is a place that does something like this, the force mud thru the intake mani under 7-3000psi to debur anything including intakes and heads
http://www.extrudehone.com/

We can definitely port out that Hybrid manifold!

Turnaround time is about a week and a half, and cost is $400 for a fully ported manifold like these.

-Sam