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Old 09-07-2006, 11:30 AM   #1
USAFA08
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Default Cutout vs. Regular Exhaust

So right now i'm running a HKS 3'' downpipe with a qtp cutout. Here's the problem, i've had alot of problems with the wires rubbing against the driveshaft and the switch shorting out. So i'm wondering if anyone thinks i would be better off with a regular TBE, if so, any suggestions as to which one?
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Old 09-07-2006, 11:50 AM   #2
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i like my cutout but i also have a tbe. why dont you just tape the wires to underneath or something.
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Old 09-07-2006, 11:54 AM   #3
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I too love my cutout. I have my wires ziptied in about 20 different spots to keep them away from the driveshaft and hot downpipe. Don't give up the cutout. If anything, switch to a unit from www.badlanzhpe.com .
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Old 09-07-2006, 05:45 PM   #4
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Quote:
Originally Posted by D-Speed 2.5 View Post
I too love my cutout. I have my wires ziptied in about 20 different spots to keep them away from the driveshaft and hot downpipe. Don't give up the cutout. If anything, switch to a unit from www.badlanzhpe.com .
or DMH.
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Old 09-17-2006, 07:10 PM   #5
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is there any performance gain from running a cutout on a wrx or is this strictly for the sound????

i tried running with an open downpipe and i felt a tremendous loss of low end torque. Maybe you have to be tuned with a cutout for it to make power or am i just missing something?
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Old 09-17-2006, 07:16 PM   #6
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Quote:
Originally Posted by blubaru2002 View Post
is there any performance gain from running a cutout on a wrx or is this strictly for the sound????

i tried running with an open downpipe and i felt a tremendous loss of low end torque. Maybe you have to be tuned with a cutout for it to make power or am i just missing something?
I had this same problem, no low end power. I dunno, I prefer the catback anyway minus the exhaust tickets.
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Old 09-17-2006, 09:31 PM   #7
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There is no low end tq loss with a cutout. Its a myth. Turbo cars do not want anything to do with a cat back. All the fastest turbo cars just run a striahgt pipe. My qtp cutout gives me 1.5 more boost across the board and now low end. www.quicktimeperformance.com
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Old 09-17-2006, 09:55 PM   #8
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Quote:
Originally Posted by SINthetic View Post
There is no low end tq loss with a cutout. Its a myth. Turbo cars do not want anything to do with a cat back. All the fastest turbo cars just run a striahgt pipe. My qtp cutout gives me 1.5 more boost across the board and now low end. www.quicktimeperformance.com
i dont claim to be the smartest person on these boards, but i dont get this.

he says it gives him 1.5 more boost? how is that possible just from a cutout? shouldnt the boost stay at a controlled point, unless its spiking?
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Old 09-18-2006, 02:23 AM   #9
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Put it this way you get the exhaust gasses out quicker the quicker the turbo can spool the quicker you can build boost
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Old 09-18-2006, 03:19 AM   #10
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now im not a genius when it comes to this stuff either but...getting the exhaust out faster that would just allow him to get to boost quicker. He should be controlled and reach his maximum faster but it would be the same max with or without the cutout.

just my two cents
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Old 09-18-2006, 12:41 PM   #11
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Quote:
Originally Posted by blubaru2002 View Post
is there any performance gain from running a cutout on a wrx or is this strictly for the sound????

i tried running with an open downpipe and i felt a tremendous loss of low end torque. Maybe you have to be tuned with a cutout for it to make power or am i just missing something?
+17whp and +25wtq on an EJ205 with a Super 16G. Closed was 284whp and 290wtq. Opened was 301whp and 315wtq. Plus the entire curve shifted to the left, meaning more power and torque at earlier RPMs.
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Old 09-18-2006, 01:15 PM   #12
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Quote:
Originally Posted by D-Speed 2.5 View Post
If anything, switch to a unit from www.badlanzhpe.com .
Not a bad price neither. Have any of you guys had problems with it leaking at the valve?
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Old 09-18-2006, 01:28 PM   #13
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i have the mooneyes cut out. i have had it since 2002 with absolutly no problems. i run a fmic on a tdo4, with the cutout closed i hit full boost before 3000 rpm and max at about 17 psi in 4th and 5th. with it open i hit 19 psi at 2700 rpm. it spools quicker and holds a higher boost. there are NO downsides performance wise to a cutout. i have raced cars with idencical mods only they run a muffler. i walked them, i pulled constantly, i had better low end and better top end.
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Old 09-18-2006, 01:44 PM   #14
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Quote:
Originally Posted by D-Speed 2.5 View Post
+17whp and +25wtq on an EJ205 with a Super 16G. Closed was 284whp and 290wtq. Opened was 301whp and 315wtq. Plus the entire curve shifted to the left, meaning more power and torque at earlier RPMs.
You ever post a dyno sheet for that?
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Old 09-18-2006, 02:28 PM   #15
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Originally Posted by InfamousDX View Post
You ever post a dyno sheet for that?
+12345
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Old 09-18-2006, 02:34 PM   #16
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The dif is quite simple... if you are building boost you are going to make more power w/o a muffler then if you had a muffler. Off boost, esp from a stand still you will not since your torque is drained untill you hit boost. My butt dyno proves this
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Old 09-18-2006, 03:56 PM   #17
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i have qtp cutouts as well running through my oem exhaust, when open i feel a great deal of difference especially after my tune, imo open downpipe is the best route to go for top end powar!!!! "
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Old 09-18-2006, 04:52 PM   #18
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it seems to me that there is no consensus on what exactly these do. one guy says more torque and more horsepower down low but he doesnt have a dyno graph. Are the gains from these cutouts only happening to pple with larger than stock turbos?

other pple i hear from say better top end power.

And now other pple say that they hit higher boost psi when its open also
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Old 09-18-2006, 05:56 PM   #19
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I would imagine that larger/aftermarket turbos would magnify the power gained from an open/cut out exhaust. I personally have a stock turbo, the most gains are felt under moderate-full throttle.
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Old 09-18-2006, 07:19 PM   #20
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Quote:
Originally Posted by D-Speed 2.5 View Post
+17whp and +25wtq on an EJ205 with a Super 16G. Closed was 284whp and 290wtq. Opened was 301whp and 315wtq. Plus the entire curve shifted to the left, meaning more power and torque at earlier RPMs.
Darren, are these numbers your talking about from my setup? If it is, you got the numbers a little wrong. The whp numbers are correct, but the wtq is 264 w/ the cutout closed and 299 w/ the cutout open. Also, these numbers were on a 100F+ degree day with most likely heat soak.

This is with a badlanzhpe cutout (same as D-Speed 2.5 who convinced me to get it) welded into an ebay replica turboxs race pipe with the rest of the txs tbe system, Super16G, ssautochrome tmic and other supporting mods.

I've got the dyno charts, which i can post later. Stupid question though, how do I post the dyno charts?
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Old 09-18-2006, 07:25 PM   #21
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was the car tuned with the cutout open and closed? because if you tune with car with the cutout open and then just dyno it by closing it; no **** your gonna get totally different numbers. just to make sure...
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Old 09-18-2006, 07:30 PM   #22
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does the cutout cause too much turbulance when closed?
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Old 09-18-2006, 07:55 PM   #23
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was the car tuned with the cutout open and closed? because if you tune with car with the cutout open and then just dyno it by closing it; no **** your gonna get totally different numbers. just to make sure...
Well, my car was originally tuned with the cutout closed and then when I got my cutout working properly my tuner said he adjusted the timing a little so that I could run with the cutout open or closed on the same map on my UTEC. This way I wouldn't have to change maps when I want to open the cutout.

Quote:
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does the cutout cause too much turbulance when closed?
Do you mean the little pocket that is created when the cutout is closed? I asked about this on this forum a few months back when I was researching the cutout and was told it was so small it wouldn't affect anything. This is just wait I was told though.
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Old 09-19-2006, 12:06 AM   #24
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Originally Posted by scubyslacker View Post
Darren, are these numbers your talking about from my setup? If it is, you got the numbers a little wrong. The whp numbers are correct, but the wtq is 264 w/ the cutout closed and 299 w/ the cutout open. Also, these numbers were on a 100F+ degree day with most likely heat soak.

This is with a badlanzhpe cutout (same as D-Speed 2.5 who convinced me to get it) welded into an ebay replica turboxs race pipe with the rest of the txs tbe system, Super16G, ssautochrome tmic and other supporting mods.

I've got the dyno charts, which i can post later. Stupid question though, how do I post the dyno charts?
Scan them, host them on a free pic hosting service, and post them here using those [img] tags.

Those are quite the gains... I'm guessing the hot hot day actually hindered the closed system much more than average.
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