alextaylor29

I think I found my next, "Fun" mod, exahust cutouts that can be open or closed with a switch.

http://www.quicktimeperformance.com/

Has anyone does these on their E55's and if so do you like them? Apparently there is an HP gain and the sound must be thunderous!

Appreciate the advice as always.

Alex

CDUBYA88

I have been interested in doing this as well. How much are their kits?

alextaylor29

Looks to be around $300 for the parts and I'm guessing 1-2 hours labor/installation time? So $500 all in, this is just a guess however.

A few folks have done this so I'd love to hear from them. There is an HP gain here, probablly 20-30 HP with the valves open.

CDUBYA88

Thats pretty cheap really. I would like to hear what it sounds like. I also want to do this on my E63.

alextaylor29

Here are some videos directly from the manufacturer and they look pretty cool! I'd mount the switch in the hidden compartment that's at the base/front of ou driver's side seats. Reach down, pop it open, hit the switch and 100 db at full launch.

I could see me doign this at a stop light when somebody pulls up to race me and the look on their face particularlly if I rev it a few times before launch with these wide open would be priceless!

And if the Po-Po roll up, hit the switch again and you're quiet as a mouse.

Link to their videos: http://www.quicktimeperformance.com/Media/index.php

Plus there IS an HP gain here, (guessing around 30 HP) it's just not for sound.

Alex

RedBullJnky

chawkins has cut outs with the switch in that exact spot. They do sound amazing too. You two have the same headers also. You might want to check with him on this.

alextaylor29

Will do, thank you sir!

AKnight55

Chawkins gained about 10 rwhp (I believe) with open cut outs

rac3rx

I had a raceland cutout on my GTR and it was great! And and a wireless keyfob so you don't have to drill a hole for the switch. Think going to order a set my E63 soon

turbo97se

I have tried them. Not very reliable. The come apart easily even with thread locker. Ended up welding the thing together then motor failed. This was a while ago so maybe design has improved. I would look for longer term usage reports. Mine would fall apart after a few weeks until I welded it.

PACougar

I too have had a set fail, they were made by race ready.

alextaylor29

Thanks guys, wasn't aware of the high failure rate. Looking at QTP's version which do look stout.

turbo97se

Mine were QTPs

PACougar

Trust me, if someone can post up some reliable cut outs I'd be all over them!

paulmana

Not at all. That's good if you like it.

DME55

I have also been doing some research for about a hour and I have found that the reliable set would be the DMH performance one's I have heard a lot of negative things about the qtp cutouts

DME55

The one question I have about the cutouts is location what do you guys think would be the best location to install the cutouts as far as power gains has anyone attempted to put the cutouts before the primary cats I know the chance of it throwing a CEL is pretty high my next thought would be to put them after the primary cats is anyone seeing a loss in back pressure from putting them there my next location would be after my x-pipe I feel that would be the ideal location I am open to any input

andy_azn

i have a set of qtp, lifted the car to put it on but theres no room under the car to put it besides the back right before the mufflers, didnt put it on because it was too noticeable. i had one on the evo 8 30hp gain at top end, fun but loud

alextaylor29

Good to know! They have some new, "Low profile" ones that might fit. Chawkins2001 has these and he said he'd post here soon. They work great for him so let's see what he says OK? He has an E55 of course and his car is monterous!

I'll check out the other vendor as well, appreciate passing that alone.

I don't want to do all this and then have them fail, especially since I'll be drilling into my gorgeous Floor Fabbed Long Tube Headers.

I'll keep digging around as well, heck maybe I can organize a group buy for us, like I did with the TTM E55 scoops!

Thanks!

Alex

alextaylor29

Here's the other vendor:

http://www.dmhperformance.com/index.html

Alex

chawkins2001

Yes, I have QTP electric cutouts directly bolted to my FF Headers, made 10rwhp/12rwtq with them open on the Dyno.

I will insert some pics and links for the stuff here.

alextaylor29

Peeps,

Found a really good thread here about these, net-net don't get them. A few folks have lost motors because of them (The engine temp goes way up apparently) and with our cars already battling heatsoak and cylinder number 8's fuel issue, it's not worth the risk. Basically the motor start leaning out as much more air is flowing out more quickly when these are open and given modded E55's risk with anyway...you could lose the entire motor.

Read this thread, really informative.

http://www.chargerforums.com/forums/...d.php?t=137120

So I won't do these now...have to be safe with the E55 motor.

A couple key points from the above thread:

Pros:
-Sounds Badazz!
-Set's off car alarms
-I have noticed a difference in performance when closed vs. open
-Can go from a moderate sounding exhaust to a beast all at the press of a button
-4 Yr Warranty
-Friendly staff at DMH

Cons:
-Staff doesn't always stick to their assurances, ex. you should have these in 2 days when really 2 weeks
-I've replaced the sets about 4 times already, currently awaiting 5th set
-Motor's have blown out making the cut outs flap and rattle
-I've noticed that when running these for a long time they make the engine temperature rise. I have mine installed after the cats, and almost instantly after you close them the temperature goes back to normal
They sound best when in auto-stick mode


Overall, I'd say if I had the option to do it all over again I probably wouldn't. Too much work and poor build quality. 5 sets in 2 years is unheard of, good thing that I know how to replace them myself, I can only imagine what the cost of this would have been had I taken it somewhere and had them replaced each time. Again when they work properly I LOVE THEM. But too much work in my opinion.

Another...

With the cut-outs open you have effectively shortened the overall length of the exhaust system, which affects the cylinder scavenging that is provided by the exhaust. In short this means the exhaust cannot effectively remove all the hot spent gases before the valve closes, leading to higher combustion chamber temps.

If you do a little searching about cut-outs, you'll find that this is primary reason why people say that, while they improve top end HP, you lose some low end TQ running them open. The more fresh fuel and air you can pack into a cylinder, the more power you will make.

And the last

I rarely open them everyday, I'll usually have them open for short bursts and close them. I did blow an engine last year and I really cant prove it but I'm pretty sure it was the result of the cutouts. I drove from Philly to Delaware with them open most of the way and I was racing an older M3 about half the time. I stopped at a gas station to get fuel w/them open filled up and went to start the engine and BOOOOM! Heads dropped down into the cylinders because the car overheated. That short sitting while at the gas station re-fueling made it worse I suppose.

DME55

Good info.. Chawkins2001 do you think the numbers you made were worth the cost. I have heard when putting them directly after the primary cats you leave each cylinder head fighting each other instead of working together also brings up the loss of back pressure.

alextaylor29

I'm not as technical as many of you here, but I think the gist is when these are open it throws off the A/F ratio, drops backpreasure and the motor can't cope/adjust around this sudden and significant change, particularly if they're open for a long period of time. Plus these aren't reliable at all which adds more issues.

This is just an educated guess on my end, but as I've yet to have a single mod of mine fail in 3 years, I don't want to start now particually given the risk.

Alex

DME55

Yes your are correct but with putting them directly after a x-pipe or h-pipe or just after your secondary cats that would clear that issue up. In my case I have a x-pipe on my car putting the right after that would make the x-pipe prevent the back pressure so you would still have each cylinder head getting a even amout of pressure instead of fighing for it