Sound Performance Exhaust Cut Out (Boost Activated)

[kicker22705]

i didn't see this anywhere on the forum and thought this looked like an awesome product that could be great alternative for MSP guys here on the forum.

I was looking at electric cutout but wasn't fond of the fact you had to switch it on everytime you want to open it, plus the valve opens so slow. i was gonna hook it up to my microtech to open automatically when it hits a certain boost but when i saw how slow they open, it really turned me off.

i began thinking of making my own that ran off an actuator that functions like a wastegate but for the exhaust and happened to stumble across this.

i love how this has no switches, how quickly it opens and closes, and is boost activated allowing for back pressure at lower rpm/boost to keep low end torque for daily driving.

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http://www.spracingonline.com/store/SP_Exhaust_Cutout__Boost_Activated___3_inch/3673

 

[Amdeus]

Im not sure if when it closes back during shifts if that wont make a s*** ton of back pressure for a second since your changing air pressure at that point.

 

[jmv]

i personally don't like the idea of those, because i don't necessarily want my car loud as hell any time that i go into boost... for example, if i have someone in the car with me that i'm talking to as i merge onto the highway, and get some boost going to get in the right place, i don't want it to suddenly interrupt the conversation. But thats just me. I'd love to have a switch operated electronic cutout though.

 

[pavone]

sounds like vtec kicking in...haha lol (not serious)

 

[HondaEat-R]

I agree, stick with the switch operated cut-out. If you know you're going to be racing, or beating on the car just flick the switch, easy. Having it boost activated would be a pain in the nuts. You'd have to go out of your way to not get into boost. It's just as inconvenient as the switch operated one seems.

 

[kicker22705]

I agree, stick with the switch operated cut-out. If you know you're going to be racing, or beating on the car just flick the switch, easy. Having it boost activated would be a pain in the nuts. You'd have to go out of your way to not get into boost. It's just as inconvenient as the switch operated one seems.

not necessarily. if you set the actuator to open at a level you don't usually hit during daily driving then you won't have that problem. for example, i do my daily driving at 7psi and spirited driving at 18psi. if i set the actuator to open at 11psi then i can go wot all day at 7psi w/ the cut never opening.

but yeah i can see how annoying it can be say if you stay at the same boost for daily and spirited.

guess it really depends on your setup that determines which is more convenient. i know many people have EBC w/ mulitple presets, a low for daily driving and a high for racing. with this boost activated cutout it'd be one less switch to flick on and off when you want to race.

 

[jmv]

true, i didn't think of that.

although, i suppose you might spool quicker with a switch operated cutout... no backpressure during the building boost would probably lead to quicker spool, whereas with this you don't receive the flow benefits until the spooling has already started... but its probably a marginal difference.

 

[fuadmsp]

doesnt atp make kind of the same thing

 

[dmention7]

Interesting idea. If you didn't want it to open up on you prematurely, it would probably be fairly simple to install a solenoid or switch of some sort in the vac line that would prevent it from seeing boost when engaged. Kind of a convoluted setup, but it would give you the ability to shut the thing off completely when you know you don't want to be making noise.

Then again, as jmv pointed out... if you have to flick a switch to operate the cutout anyways, you might as well get an electronic one so you can get the advantage of quicker spool.

I suppose the ultimate would be a 3-way switched setup: Closed, Boost-activated, Open. But that honestly seems like far more trouble than it's worth. hehe

 

[greasemonkey524]

This is kind of a neat idea. Like others said it seems that it would benefit those that run on two or more different boost settings. I'm not running that much boost and it's nice that I can control when I want the cut-out to open/close. It really doesn't take all that long to open/close them though. It's nowhere near as quick as the actuator controlled one but I wouldn't consider it slow.

 

[kicker22705]



if you really wanted to you could run an electronic boost controller off the actuator to instantly change when the valve opens. for example start off with an low actuator spring like 3psi. you want quick spool up, set it the ebc running off the actuator to low boost (3spi) so it opens early. then if u want it to open later set it for 11psi. then if u don't want it to open at all, set it for like 30psi or something u never see.

granted the added backpressure in the very beginning would cause for a slower spool up, but the added low end torque would make up nicely for it.

 

[twistiert]

that is a pretty sweet idea not to threadjack but what wheels were on the car n the second video

 

[mp3-79bronco]

nice! i want lol