intake butterflies?

[float_6969]

I hit the dyno today. I forgot to print of my sheets, but I'll go pick them up tomorrow. It is VERY clear that the butteryflys DO help in the lower RPMS. Unfortunatly we couldn't get a clean tach signal, so all the runs are based on speed, which kinda sucks.

Anyway, what I did was leave them open from like 1500 rpm up (basically the whole pull). I compared that to a pull with them switching open at 4K RPM. I would guess the gain was about in the 20% range that dattodude said below 4K. I'm DEFINATLY leaving them the way they are.

Also, a little bit of experience for you here. In stock form, I BELIEVE (I don't have any proof) that they stock ECU cyled the the solenoid so that the butterfly's opened slowly. I have found that if they are opened quickly, there is a bit of a "hiccup" in the power that''s a little irritating. I'm not able to do this with the SDS, but the solution was simple enough. The solenoid that I used has 3 port. One inlet, and then one that the air passes through w/o power to the solenoid and one that the air passes through w/power to the solenoid. Mine is setup so that at 4K RPM the solenoid is energized and the air is allowed to bleed from the butterfly actuator. I used to just have this open to the air and the butterflys would open quickly. To fix it, I simply found a rubber vac cap that's designed to plug off a vac line. It took a couple of trys, but I got a small enough hole in the cap that the air now SLOWLY bleeds from the actuator line and the power delivery is MUCH smoother now. I'm very happy with it. An inline restrictor would have the same effect, but I couldn't find one readily.

Just to reiderate, the butterfly's aren't NESSICARY, but if hooked up CORRECTLY, they DEFINATLY make a NOTICEABLE difference, and I intend to have a dyno sheet up proving it.

[dattodude]

Does that get me a silver star for good advice? :-)

[float_6969]

No, but it does earn you a cookei!!!

[float_6969]

Well this picture doesn't really do the butterfly's justice. First of all we can't seem to get a clean tach signal off of the SDS. I'm not sure why. Secondly, because we can't get a tach signal, they have to base it off of speed, and so they can't figure torque, which is the whole point of the butterflys. But nonetheless, you can see a difference. The blue line is with them opening at 4K RPM. The red line is with them open the entire time.

Concequently, you can see where the lines cross. I've changed the opening point from 4K to 3750. That should eliminate that. I haven't had a chance to test it yet as they needed the dyno to tune a TT 350Z w/emanage so they kicked me off

[Darius2250]

well I have been reading this thread, I have looked in my FSM what is the proper way to hook these little buggers up? just a VAC line? or is there somekind of wireing thingy I have to do, like from the little selenoid thing that used to hook into my turbo (hooked up a EBC and took the selenoid out of the loop)

[tyrannix]

what kind of solenoid are you using for the butterflies ryan?

[UMS_CA18DET]

any air solenoid should work as long as their is a signal and power.

[UMS_CA18DET]

check these out. I had amazing success with these type of solenoids in paintball guns.

http://jelpc.en.alibaba.com/pr....html

[float_6969]

what kind of solenoid are you using for the butterflies ryan?

any air solenoid should work as long as their is a signal and power.

Exactly. I think mine came from a honda or a toyota. I don't remember for sure. I just hit up the junkyard and grabbed about 5 different ones from various cars. You just want to make sure it's got 3 ports on it, it doesn't matter how they're arranged.

[tyrannix]

sometimes we forget, ive only been doing the car-build thing for like almost 2 years now, i have only seen (wastegate actuator-type) and solid electric (no air) solenoids and knew what i was looking at

what part of XYZ car would be using an air/electric solenoid? (and if its electric, does it really need the air part? ... or does that just make it so its not a constant draw on the electricity?

CJ

picture of the solenoid youre using?

[UMS_CA18DET]

Some hondas use a air solenoid because they have intake butterflies as well and are rpm activated as well.

SMC makes Electronic Air Solenoid Valves.

Pretty much your air source goes in one port, but is blocked until the signal is received to open it than goes out the other ports.

[float_6969]

picture of the solenoid youre using?

Does this explain it better?

[dash]

nice work on the R & D. Good info

[float_6969]

Thanks!

[datsunboy]

hey float,just going to wire up my solenoidand just wanted to check to make sure first.But I assume that it is wired, with 12V IGN power to one side of the solenoid, and the other EARTHs back through the ECU ( pin 8? ).

or does it get power from pin 8 and earth to chassis?

[float_6969]

The ecu switches the ground.

[datsunboy]

awesome thanks

[Darius2250]

Can the stock boost control silenoid be used?

[float_6969]

Yes, it should could be