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Old 11-14-2006, 02:46 AM   #1
Dyno Flash
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Default Q TIP Exhaust Cut out on WRX - results

Here is a 05 WRX I tuned last weekend

The car was bone 100% stock except for the SP factory intake kit and aQ TIP 3 " exhuast cutt out in the down pipe

I tuned the cer very nicely with my pro tuner mapping equipment and it was time to test the power gains of the Q TIP - at least on this otherwise stock car




HNeck the car sounded like all heck was breaking loose - sadly it sounded better than it ran
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Old 11-14-2006, 02:49 AM   #2
Dave6265
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so this graph was with the QTP* open? Did you do a map of it closed as well? I'm curious to see a graph of just the spt intake on.

Curves look good as always Al, I'm really liking your work with subarus every since you got back into the game and have been posting up more often.
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Old 11-14-2006, 03:15 AM   #3
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so is it safe to say that your DD dyno reads the same as most DynoJets?
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Old 11-14-2006, 04:55 AM   #4
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The runs there are with the completed tune - Qtip closed and then Qtip QTip open

It only shows the gains made by opening the Qtip - (mostly sound)
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Old 11-14-2006, 04:56 AM   #5
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Quote:
Originally Posted by Drews_WRX View Post
so is it safe to say that your DD dyno reads the same as most DynoJets?
I dont think that is safe to say

Our Dyno Dynamics was just factory calibrated and is 3 weeks old

It would be safe to say that it reads like a Dyno Dynamics
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Old 11-14-2006, 05:05 AM   #6
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i didnt think you gained much from them, and now its proven
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Old 11-14-2006, 07:23 AM   #7
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I have seen people post 15-20whp difference with a cutout. I wonder why it did nothing for you...
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Old 11-14-2006, 08:27 AM   #8
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please stop calling it a q tip! if you plan on putting that thing in your ear, then i'm sorry. it's qtec, or QTP for quicktime performance.
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Old 11-14-2006, 08:32 AM   #9
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Quote:
Originally Posted by quadtard View Post
please stop calling it a q tip! if you plan on putting that thing in your ear, then i'm sorry. it's qtec, or QTP for quicktime performance.
Nice reading the joke...you sure did school him
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Old 11-14-2006, 08:36 AM   #10
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so did this guy have a stock down pipe? with cat?
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Old 11-14-2006, 10:57 AM   #11
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Quote:
Originally Posted by Drews_WRX View Post
so is it safe to say that your DD dyno reads the same as most DynoJets?
LOL, how else is a ej205 WRX going to outpower an STi with just an intake and a earwax removal tool?
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Old 11-14-2006, 11:15 AM   #12
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LOL this thread is cracking me up...
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Old 11-14-2006, 11:30 AM   #13
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Quote:
Originally Posted by Dyno Flash View Post
I dont think that is safe to say

Our Dyno Dynamics was just factory calibrated and is 3 weeks old

It would be safe to say that it reads like a Dyno Dynamics
There is no way it reads like a factory dyno dynamics. Stock STi's put down 200 and my buddys WRX put down 130 on a Dyno Dynamics. That dyno is definitely calibrated to a dyno jet and if not then really close to.
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Old 11-14-2006, 11:36 AM   #14
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you can do dyno jet sheet conversions on the dyno dynamics...


^^ 130 awhp is definatly unbelievable though
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Old 11-14-2006, 11:40 AM   #15
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^^^

Well APS, DynoComp, Automaster, etc.. All use the same dyno and they all read those numbers as well. So there DD is definitely calibrated to a dyno jet or again close to.
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Old 11-14-2006, 11:54 AM   #16
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Who the hell cares what dyno it is and what it's calibrated like?

It's a plot showing before and after on the SAME dyno. The difference between the two lines is all that matters.
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Old 11-14-2006, 12:46 PM   #17
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I guess all car react differently but here is a dyno plot from a friends '04 WRX that shows open vs. closed:



Keep in mind that this is uncorrected, 100+ degrees in the dyno room, and at about 5,500 ft in elevation. Its hard to see but peak change in power was 17whp and peak change in torque was 25wtq. These were back to back runs with no additional tuning.
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Old 11-14-2006, 01:05 PM   #18
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I don't see how people gain power running open downpipe.
I have tried this with my setup which consists of a big16g and the car seemed slower. It felt so dead up top because of the loss of back pressure.
Also, the spool felt slower.
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Old 11-14-2006, 01:31 PM   #19
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if it's the stock downpipe, is it the stock downpipe with a cat in it? If there's a significant restriction before the cut-out, it's not going to make any difference...
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Old 11-14-2006, 01:56 PM   #20
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I see 10-12 whp with the cutouts on a routine basis. As much as 20 with a larger turbo car like stg4. Not sure why this car picked up little. Other factors might be at play. Correct factor? temp in the room? Temp of engine?

Clark
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Old 11-14-2006, 02:10 PM   #21
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Quote:
Originally Posted by akira02rex View Post
It felt so dead up top because of the loss of back pressure.
Backpressure isn't an issue on a turbo car like it is on a na car. The turbo itself makes the back pressure.
Was the car tuned with the cutout open? You can't just put on a part and expect it to make more power. In a lot of casses adding something to your car without tuning it will make it slower and or make it run leaner.
Quote:
I see 10-12 whp with the cutouts on a routine basis. As much as 20 with a larger turbo car like stg4. Not sure why this car picked up little. Other factors might be at play. Correct factor? temp in the room? Temp of engine?

Clark
This is the norm for a cutout.
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Old 11-14-2006, 02:16 PM   #22
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230 whp/240 wtq peak seems impossible for a intake and tune only on a stock 2.0l. On most DD that would only be possible with a very well tuned 2.0l with full 3" TBE exhaust, IC and maybe a header.
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Old 11-14-2006, 02:23 PM   #23
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Quote:
Originally Posted by AZScoobie View Post
I see 10-12 whp with the cutouts on a routine basis. As much as 20 with a larger turbo car like stg4. Not sure why this car picked up little. Other factors might be at play. Correct factor? temp in the room? Temp of engine?

Clark
This is in line with all the cutout results I have seen as well. The graph that I posted was a car with a big 16G. While these do add decent power, they also add big wtq: 25wtq in the case of the chart I posted (sorry I don't have a graph for the torque)
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Old 11-14-2006, 02:42 PM   #24
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i gained 40whp with my cutout open vs closed. 380 whp vs 420 whp. gt35r on ej207. 3 inch downpipe with dmh cutout and stock sti catback.
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Old 11-14-2006, 03:43 PM   #25
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So where in the stock downpipe was the cut-out installed? Before or after the cat? Do you have pics?
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