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Old 10-07-2004, 12:11 AM   #26
luspeed
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Quote:
Originally Posted by mbiker97
Did Ed explain to you that the wastegate is the ONLY thing that controls boost, not just a big part of it.

Now I see though. He changed the waste gate spring, and probably upped the boost too
Atcually, the orifice is more lke a tube that controls the amount of air flow in the pressure hose that goes to the waste gate acutator. Ed had to change the diameter of the orifice to control my boost. However, my max boost never changed between the two tunes, still set at 16.5 psi.

What was cool was the car actually wanted to make more power but I was limited to my stock injectors. At a point during the tune the car made about 245whp but my injector duty cycle was in the 90% range so Ed had to detune somewhat so I wouldn't face issues of wearing out my stock injectors too soon. Once my injector duty cycle was in a safer range 241whp is where the car ended up at.
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Old 10-07-2004, 01:39 AM   #27
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Who makes divorced downpipes anyways?
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Old 10-07-2004, 02:32 AM   #28
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cusco and perrin to name 2
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Old 10-07-2004, 02:43 AM   #29
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why do the dyno charts say that horsepower and torque are "at engine"? does it do a drivetrain loss test? and if they are calculated crank hp and tq numbers, the 2002 wrx baseline seems extremely low.
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Old 10-07-2004, 03:03 AM   #30
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Note: Why is the crossover point so low, 4500? What kind of correction factor moves the crossover from 5252 to 4500?

I do agree that an excape for exhaust is helpful when you are on the high end, but I would rather see a bellmouth like Helix versus the divorced wastegate...I suspect they would be nearly identical.
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Old 10-07-2004, 07:35 AM   #31
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Quote:
Originally Posted by bren wrx
dude that BS, even top tuners like XX tuning say the Flat Planes make more torque.
XX is nowhere near being a "top tuner" They are nice guys, and have a great shop, and they are DECENT tuners, but When My car goes on their dyno, I am bringing my OWN guy to tune it. (no offense if you read this Danny, but only Mark(TMS) and Phil and myself touch my tune)
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Old 10-07-2004, 08:19 AM   #32
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I think that much of the difference is in the tune. I have no doubt that a divorced wastegate tube will flow better than a flat plate, but I wouldn't expect those differences to be seen at engine speeds as low as 3500rpm's. The hp gains that you show for 3500rpm are pretty consistent up until engine speeds get over 6000rpm. I would have expected the gains to be small (if not zero) at engine speeds of less than say 5000rpm.
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Old 10-07-2004, 12:13 PM   #33
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Quote:
Originally Posted by Davenow
XX is nowhere near being a "top tuner" They are nice guys, and have a great shop, and they are DECENT tuners, but When My car goes on their dyno, I am bringing my OWN guy to tune it. (no offense if you read this Danny, but only Mark(TMS) and Phil and myself touch my tune)
i was told not to listen to "davenow" and "tms"

XX has dyno'd both in house, have you?
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Old 10-07-2004, 01:07 PM   #34
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Quote:
Originally Posted by AntiochCali
Note: Why is the crossover point so low, 4500? What kind of correction factor moves the crossover from 5252 to 4500?
good point. the crossover point from hp to tq should NEVER change. the only thing i can think of for that is that hp and tq have different scales on that chart.
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Old 10-07-2004, 01:24 PM   #35
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Quote:
Originally Posted by Russ77
the only thing i can think of for that is that hp and tq have different scales on that chart.
They are different scales. If you look they would cross at 5252.
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Old 10-07-2004, 02:59 PM   #36
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it would have been nice to see a plot of MAP too, but thanks for the data nonetheless.

i don't know why there's so much hostility in this thread, though.

ken
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Old 10-07-2004, 03:23 PM   #37
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Quote:
Originally Posted by Russ77
why do the dyno charts say that horsepower and torque are "at engine"? does it do a drivetrain loss test? and if they are calculated crank hp and tq numbers, the 2002 wrx baseline seems extremely low.
From what I understand, Brainstorm's dyno is supposed to compensate for drive train loss which should translate to higher numbers on the dyno. Funny enough the second graph you referred to that I downloaded off their dyno compares a previous stock 02' run against my final dyno run that day. The numbers look right for stock whp on a WRX running 91 pump gas here in Cali:

158.1 hp /142.8 ft-lb tq

When Ed did my very first run I had the mods I mentioned above (intake, uppipe, turbo back) but no Ecutek tune and put down the following dyno numbers:

177.5 hp / 185.6 ft-lb tq

I'm guessing that without those mods I would have put down numbers close to the stock 02'. I added the dyno graph of the stock 02' vs. my modded 05's pretune numbers to this link: Stock vs Pretune

I've been told the best way to use a dyno is to look at what you put down before mods vs after mods. Then you have a rough idea of what you gained through the mods/tuning.

Last edited by luspeed; 10-07-2004 at 05:05 PM.
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Old 10-07-2004, 05:02 PM   #38
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Quote:
Originally Posted by Diversion
Who makes divorced downpipes anyways?
I opted for the Stromung div w/g dp and it cost me $189. Not polished or fancy like some others but it seems to be good quality and it works. Bear in mind Stromung sells a two piece system as opposed to the typical one piece after market dp's. So if you want to keep the stock 3rd cat, this dp will bolt up to that mid pipe section. Stromung offers a connecting mid pipe section with or without a high flow cat. I have the high flow cat and can tell you it's REALLY small. Looks more like a mini resonator.
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Old 10-08-2012, 07:22 PM   #39
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Really good info thanks. Just what I was looking for. I'm running an HKS flat plate design and can't break my 14.8 time on the 1/4 mi. I got 14.7 once but eeehhh
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Old 10-09-2012, 12:40 AM   #40
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Quote:
Originally Posted by UnknownAlly
Really good info thanks. Just what I was looking for. I'm running an HKS flat plate design and can't break my 14.8 time on the 1/4 mi. I got 14.7 once but eeehhh
Really? This thread is from 2004
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Old 10-09-2012, 01:22 AM   #41
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Really? This thread is from 2004
Hey, at least he is searching.
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Old 10-09-2012, 09:47 AM   #42
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Originally Posted by 181stLeader
Hey, at least he is searching.
True but still lol
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Old 10-09-2012, 10:44 AM   #43
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He searched, I give him props. At least he didn't start a new thread to ask this question. This is the lesser of two evils. Props to him!
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Old 10-09-2012, 03:14 PM   #44
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Quote:
Originally Posted by 181stLeader View Post
Hey, at least he is searching.
Agreed!

Quote:
Originally Posted by UnknownAlly View Post
Really good info thanks. Just what I was looking for. I'm running an HKS flat plate design and can't break my 14.8 time on the 1/4 mi. I got 14.7 once but eeehhh
Sorry my friend but 14.7 is slower than a stock bugeye WRX. I can assure you the improvment you seek in the quartermile will not be found in this thread. Instead, post your slip break down (60ft, 330ft, 1/8, 1/4) and current mods done. Do you have an uppipe yet?
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Old 10-12-2012, 10:02 AM   #45
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I wonder if Bren still feels no power is made from divorced/belmouth down pipe?
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Old 10-12-2012, 05:40 PM   #46
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Originally Posted by Steve.804 View Post
Agreed!



Sorry my friend but 14.7 is slower than a stock bugeye WRX. I can assure you the improvment you seek in the quartermile will not be found in this thread. Instead, post your slip break down (60ft, 330ft, 1/8, 1/4) and current mods done. Do you have an uppipe yet?
Can you tell me what I'm doing wrong? Is it the launch?
My slip...

60ft - 2.213
1/8 - 9.586
MPH - 90
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Old 10-12-2012, 09:48 PM   #47
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Originally Posted by 181stLeader View Post
Hey, at least he is searching.
^ this
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Old 10-13-2012, 11:54 AM   #48
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Originally Posted by slowgenius View Post
I wonder if Bren still feels no power is made from divorced/belmouth down pipe?
I would imagine. If you think about when you are WOT the wg is shut for the most part.
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Old 10-13-2012, 12:48 PM   #49
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I would imagine. If you think about when you are WOT the wg is shut for the most part.
Absolutely false. At WOT and full boost the waste gate is wide open.
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Old 10-13-2012, 05:32 PM   #50
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Quote:
Originally Posted by decodeddiesel

Absolutely false. At WOT and full boost the waste gate is wide open.
I don't think so. The turbo won't build any pressure if the exhaust goes freely around it. Disconnect your wastegate so it stays open, go for a ride. You will not see hardly any boost at all. I've had this happen to me.
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