Electric cutouts--best way to wire up?

[Bandit]

OK--I posted about cutouts awhile back, well I decided to go with the QTP cutouts, and they will soon be bolted up (I hope). Of course I have 2 of them and need to wire them to work together. I am looking for a trick way to set them up. Not just the standard open/closed fare, but something even more practical and unusual.

Here's one Idea I had: what if I were to wire them through an RPM-activated/deactivated "window switch," like the MSD unit?
https://static1.pt-content.com/images/pt/2007/02/1218950-1.jpg
I was thinking I could have the switch set up to open the cutouts at a certain RPM, say, 3,000, then close them at another, like 4,000, or whatever. I could control the system with a 3-way switch in the cockpit, giving me the options of continuously open/continuously closed/rpm activated, at the flip of a switch. If it works well enough, I figure I can pretty much leave the window switch activated all the time, then my cutouts will automatically open whenever I bury my foot in the pedal.

Has anyone tried a setup like this for their cutouts? Is there any reason it wouldn't work? One concern I had was that the QTP's might not open fast enough to open fully in the chosen RPM range during fast shifts (they take a couple seconds). But in that case, it's not a big deal really. If I was really concerned about making sure they open, for example at the strip, I could just plug a lower RPM "pill" into the window switch that would give it more time to activate. Or, just run them wide open for the time being.

Also, could this work ok as a simple circuit without the pricey controller unit from QTP? I don't really see why I would need it. But if I have to have it to make this work, then I have to have it...:naughty:

I see the cutouts as a really fun and different addition to my street machine. If I could set it up this way it would be even cooler!

Opinions? If anyone has any tips for this install, or a better way to accomplish the same thing, hook it up!
:drive:

[Takid455]

Just to forwarn you, QTP cut out are the ones to avoid. out off all teh ones that exist, stay away. this was told to me by ezhaust fabricators and street rod builders and drivers. there is a gauntlet style (door slides in a grooove that is bigger than pipe and seals off all flow) set up that is out and is recommended. the problem w/ the door flapper style (QTP) is taht teh door bends and the motor doesn't hold it tightly closed. maybe your expiriences with differ.

[Bandit]

Just to forwarn you, QTP cut out are the ones to avoid. out off all teh ones that exist, stay away. this was told to me by ezhaust fabricators and street rod builders and drivers. there is a gauntlet style (door slides in a grooove that is bigger than pipe and seals off all flow) set up that is out and is recommended. the problem w/ the door flapper style (QTP) is taht teh door bends and the motor doesn't hold it tightly closed. maybe your expiriences with differ.
OK, maybe I'll use them then, maybe I won't. I have heard mixed reports about them. I do have a knack for buying the problem parts though.
Either way, what do think about my idea of using a window switch to activate the cutouts?

[camaro608]

i dont see a problem with it but do you always want them to be on i mean when you get on it do you always want them to open? i think two toggle switches would work fine just hit them when you want to.

[Bandit]

i dont see a problem with it but do you always want them to be on i mean when you get on it do you always want them to open? i think two toggle switches would work fine just hit them when you want to.
No, they would not always be open, hence the 3-way switch. One posit for open, one closed, one rpm activated.

[vanzuuk1]

Who makes the good ones?

[camaro608]

No, they would not always be open, hence the 3-way switch. One posit for open, one closed, one rpm activated.ok i got you now i didnt understand. thats sounds like a good idea i dont know why it wouldnt work and if its doesnt well then you can sell whatever you bought. it would be pretty sweet if it does work because then you could sell your idea (why didnt i think of that?)

[67SSDan]

This exact thing has crossed my mind as well. I think it's a killer idea... and hope people chime in to tell us how to do it! :)

[kamaroman68]

i think the only thing you would have too look out for is current draw of the cutouts motors. if the motors that open and close these valves draw to much current you may destroy the window switch. in that case you could simply use a relay to handle the higher current demands. overall a very neat idea. Chris

[rob07002]

Why not use a TPS instead of rpm switch? This way they would open only at WOT or whatever and not be affected by shifts.

my $.02

Good Luck

[sporter]

If your engine has a lumpy cam in it, you'll probably want to open them at idle too. I know I enjoy hearing a good idle at the local gatherings, not to mention the occaisional return "roar" when challenged by a farting ricer at a stop light. :yeah:

[halfast]

Keep it simple....... I had my QTPs off and back to warranty a coupla times, the butterfly just bent and quit sealing, sounded like a ratty ol pickup. But I loved the sound when they worked ! so...I machined a coupla butterflys outa spring steel, LOTS stronger and stiffer than the wimpy originals, they still work well! the satisfaction of that blower whine ,louder than a pack O Harleys idle, an, the top down cruisin is REALLY FINE! Oh yeah the HP gain is noticable- seat of the pants fun when they are open
http://hotrodders.com/forum/journal.php?action=view&journalid=8958&page=1&reverse=1

[dsapper]

would it be easier to use a throttle activated switch (like used on nitrous setups)? You wouldnt have the rpm but any time you gun it it would be open for a preset amount of time (whatever you choose).

The problem I see with RPM, besides excessive wear on the flapper is the wierd quiet, loud, quiet transition if you just hit the rpm on a normal cruise.

[HILROD]

The cutouts take a second or three to open. If you hold the button it'll burn up the motor. The rpm switch might work for a few quick blasts up and down the street but they'll burn up on the highway or the first time you keep your foot in it.