LpBevoEvo

iTrader: (9)

I'm tired of the highway drone / attention my catless 3" gives me. I'm looking to put a cutout on my 3"downpipe and return the rest to stock. What cutouts are most people running? Does anyone make one with an electronic valve that has shown more longevity than others? (I did a search btw, and found nothing but threads that went way off topic )

Thanks,
Ben

smokedmustang

iTrader: (7)

I was going to get a pipe to come out in front of the back wheel, but was told would have to re-dyno as it would run too lean. also was told the turbo needs back pressure to work right, or the ecu would mess up. good luck!

Mistasparkle

iTrader: (1)

well i have no exhaust after my downpipe, dont ask lol, no cat, no muffler. 3in dp

spools quicker and pulls harder
TOO LOUD
im gettting my stock exhaust put back on

timzcat

iTrader: (10)

Turbo needs the least amount of pressure possible after the turbine in order to function at it's best. The turbo is a huge restriction to the exhaust exiting the engine. The more pressure drop across the turbo the better. Downpipe is the best place for a cutout. You want at least the O2 housing and some pipe so flow is not turbulent.

HwangTKD

iTrader: (2)

timzcats,

What do you think about these issues that have been brought up:

1) There is so much noise/vibrations with the cut out open that it causes the knock sensor to go off

2) Wouldnt the afs change drastically when opening/closing the cutout? And could the stock ecu keep up with this?

Thanks!
Bobby

timzcat

iTrader: (10)

..

ct9a gsr

iTrader: (7)

You sure you searched well enough? =]

https://www.evolutionm.net/forums/sh...ust+dump+valve

That's my car. That thread includes pictures of where mine was installed, what parts I used, and a video of it in action. The vibrations and noise from the cut-out do NOT trigger the knock sensor. The noise is insanely loud though. On the dyno, the a/f ratio's barely changed at all... not even .1

However, there are things to consider if you use the electronic butterfly valve. For example, backfire'n. If you backfire, it will sound like a point-blank 9mm gunshot, no joke. It can also cause damage to the butterfly valve. I just rebuilt my valve this past week with new parts from Home Depot because I literally blew out screws and washers from it from all my fireballs.

LpBevoEvo

iTrader: (9)

Thanks! I searched for a cutout, not a "dump valve" . Looks like i'll be giving qt a call soon. I'm already tuned for a catless tbe so I should be fine cutout open or closed.

DCSilvrEvo

iTrader: (5)

Great sleeper solution

berkel

iTrader: (5)

I'm leaning this way as well.

Today, a state trooper was accelerating by me, then matched my speed and drove next to me on the highway for what seemed an eternity (actual time 10 seconds). Not fun, lol.

I think the baby shades and baby mirror helped me out though, lol.

I'll go reread that other thread, but quick question: if the cutout is open, I would get a CEL since the secondary O2 wouldn't see anything, right? But, this is just a warning type of CEL so perf wouldn't be affected? Perhaps people with the cutout have other methods to get rid of the CEL.

Thanks,

FB

Sal-Evo

iTrader: (2)

QTP in jersey makes a nice *** cutout...


(Quick time Performance) checkem out =)

ct9a gsr

iTrader: (7)

I get no CEL when the cut-out is open... so no worries with that.

Be warned, the QuickTime valve will leak after time... not much though... barely enough to even notice by sound. And as I stated before, you can cause damage and blow parts off of the valve if you have intense backfire. Another solution would be to purchase the valve from another vender, such as McCord:

http://www.mccordcg.com/mpp/order.htm

I would have ordered their valve if it didn't take one month to ship it. I also heard that Apex-i makes a really nice, but expensive, electronic cut-out too. They even have a little box that shows you the percentage it is open and everything. Very bling mod, and probably expensive. They don't advertise it anywhere except their catalog book. Give them a call if you're interested. I also heard that HKS makes a similar product as well.

If any of you get this cut-out setup, please take pictures and videos and let me compare your setup to mine. As you can see from my pics on the other thread, I installed my cut-out as close to the turbo as possible and used 3" piping all the way to the valve. =]