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05-11-2004, 08:36 AM | #26 |
Big Ron
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The general theory is that an exhaust will not cause boost creep. It is the design of the VF-39 itself that causes this. Porting the wastegate should solve boost creep issues.
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05-15-2004, 02:33 PM | #27 |
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I was wondering what is the stock downpipe's specs on a '04 WRX . So I do not replace a stock pipe with a pipe that is not anybetter.
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05-15-2004, 02:38 PM | #28 | |
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07-20-2004, 06:06 PM | #29 |
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I'm having a hard time understand how/why the stock downpipe covers the waste gate section, while the other designs all merge the waste gate exaust into the pipe somewhere? So does the stock turbo dump anything into the waste gate at all? If so, why is the stock DP waste gate section covered?
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07-20-2004, 06:09 PM | #30 |
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With the stocker, the gasses from the wastegate slam right into the flat part of the DP flange, where it meets up with the turbo. Then the gasses have to make a 90 degree turn, right into the main portion of the DP. This causes turbulence.
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08-29-2004, 08:44 PM | #31 |
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WOW...THANKS for all the info. Just bought an HKS DP and was searching for some more info. You wrapped it up and then some!!!
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08-30-2004, 08:52 AM | #32 | |
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Porting, or increasing the size of, the wastegate will allow more exhaust to pass thru the gate. This will solve the creap problems. |
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08-31-2004, 04:04 PM | #33 |
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Is it true that divorced downpipes also prevent boost creep?
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08-31-2004, 04:06 PM | #34 |
Big Ron
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Nope.
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08-31-2004, 04:30 PM | #35 |
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Thanks, and I like your title
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09-14-2004, 05:01 PM | #36 |
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what horsepower gains are u lookin at between a short dp and a dp that eliminates the third cat? assuming only mod is a catback at the moment.
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09-14-2004, 08:54 PM | #37 |
Big Ron
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No one really knows. Best guesstimate I have heard is 5HP per cat, so no cat + longer/bigger pipe = 7HP on my GuessDyno® vs. a short catless downpipe.
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10-07-2004, 10:03 PM | #38 |
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bumping for the non-searching types.
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10-12-2004, 06:29 PM | #39 | |
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10-25-2004, 01:34 AM | #40 |
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Wastegate porting
"Porting, or increasing the size of, the wastegate will allow more exhaust to pass thru the gate. This will solve the creap problems."
Does anyone know what the stock diameter is and to what dimensions the gate should be ported to? Can this be done with the exhaust pieces removed and leaving the turbo attached to the car? My assumption is I should probably remove the turbo but it would save time if I didn't have to. Are there any gotchas to doing this myself using a Dremel or drill? Or should I have a machine shop do it using a heavy drill press? Thanks |
10-25-2004, 06:22 AM | #41 |
Big Ron
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You will have to search for your answer please as this thread is about downpipes. Search hard as wastegate porting is both a science and an art and isn't as simple as boring out a hole.
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11-19-2004, 04:50 AM | #42 | |
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If so, then wouldn't stock be better than the bellmouth, while the divorced be more efficient than stock? This concern of mine postpone my decision on helix downpipe. |
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11-19-2004, 10:12 AM | #43 | |
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11-19-2004, 03:51 PM | #44 | |
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So in some way, one should be more efficient than another downpipe. If the turbulance really is that bad part, then perhaps the divorced flange is better because there must be an important reason why they have a design to separate the two distinct gasses to begin with. So is there anyone that has experiences with both bell mouth and divorced downpipe before? |
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11-19-2004, 05:56 PM | #45 |
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Search, this isn't a new topic
Drew |
11-19-2004, 06:11 PM | #46 | |
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Different tuners have different theories regarding this. Some say divorced is better, some prefer bellmouth. Both are good. Personally, I have a divorced DP (Bosal), and I have experienced no issues with it whatsoever -- but I am running the divorced design because I wanted a 'short' DP that would allow me to use the stock 3rd cat, and most 'short' DPs are divorced/twin dump. |
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11-19-2004, 10:03 PM | #47 | |
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11-20-2004, 04:26 AM | #48 |
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Does having a DP cause flames or just removing the cats?
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11-20-2004, 07:28 AM | #49 |
Big Ron
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No cats causes flames, but 99% of the time you will be flame free unless you have a bad tune or a 100% atmospheric BOV.
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11-21-2004, 02:47 AM | #50 |
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Does anyone or any tuner have proof of a divorced/twin dump being better then a bellmouth or the other way around?
Im looking to get the RSR DP...to mate to the RSR catback. |
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