Mindspin311 Posted February 9, 2009 Share Posted February 9, 2009 its all about flow. where are you mech e nerds w/ your fluid dynamics analyses? :] Right here haha flows are fun Link to comment Share on other sites More sharing options...
Mindspin311 Posted February 9, 2009 Share Posted February 9, 2009 TMICs help, especially if they're more efficient than the stocker, and flow better (less pressure drop) Link to comment Share on other sites More sharing options...
TSiWRX Posted February 9, 2009 Share Posted February 9, 2009 IIRC, the biggest gain to be had after the DP on a stage II setup, is the catback. Other mods like intake and TMIC have almost negliable effect on power. ^ That is, without a doubt, true - after the DP change, the only thing further down the exhaust stream is the cat-back section, and the more pressure that it frees up, the better. This has always been conventional wisdom, and has always held true. What I remain surprised about - and what snow05gtRI pointed out - is that with testes0101's setup, specifically, the dramatic difference improvement in output between his "Stage I" -to- his untuned "Stage I + cat-back" setups. Conventional wisdom always had us believing that post-turbo, it's the cats that have got to go, first, and that no significant gains will be seen without these restrictions out of the equation. We even have data to back this up (i.e. my setup, versus, at the time, MSPRO's, which were even tuned by the same tuner [Tim Bailey] on the same dyno [buschur's Mustang]; mine, with the third-cat in-place, was significantly lower than hers).... But it seems that testes0101's data points to a small - but not insignificant - gain with just the cat-back switch-out - something that challenges conventional wisdom, but nevertheless, seems reasonable and logical. I think that most of us have just ridden the conventional-wisdom train on-faith. This new data is definitely eye-opening, even with an "n of 1." <-- I love Winky, my "periwinkle" (ABP) LGT! - Allen / Usual Suspect "DumboRAT" / One of the Three Stooges '16 Outback, '16 WRX, 7th Subaru Family Link to comment Share on other sites More sharing options...
vkchu Posted February 9, 2009 Share Posted February 9, 2009 ^ That is, without a doubt, true - after the DP change, the only thing further down the exhaust stream is the cat-back section, and the more pressure that it frees up, the better. This has always been conventional wisdom, and has always held true. What I remain surprised about - and what snow05gtRI pointed out - is that with testes0101's setup, specifically, the dramatic difference improvement in output between his "Stage I" -to- his untuned "Stage I + cat-back" setups. Conventional wisdom always had us believing that post-turbo, it's the cats that have got to go, first, and that no significant gains will be seen without these restrictions out of the equation. We even have data to back this up (i.e. my setup, versus, at the time, MSPRO's, which were even tuned by the same tuner [Tim Bailey] on the same dyno [buschur's Mustang]; mine, with the third-cat in-place, was significantly lower than hers).... But it seems that testes0101's data points to a small - but not insignificant - gain with just the cat-back switch-out - something that challenges conventional wisdom, but nevertheless, seems reasonable and logical. I think that most of us have just ridden the conventional-wisdom train on-faith. This new data is definitely eye-opening, even with an "n of 1." miniscule sample sets rule-you can make anything true. haha but yes, that huge gain w/ just the cbe is pretty awesome. Link to comment Share on other sites More sharing options...
TSiWRX Posted February 10, 2009 Share Posted February 10, 2009 miniscule sample sets rule-you can make anything true. haha "Lies, damned lies, and statistics." but yes, that huge gain w/ just the cbe is pretty awesome. Indeed, aside from the "n of 1," other concerns arise - i.e. were there any other differences that may, in any way, affect readings, between the two cited dyno runs - but yep, it's an eye-opener, for all of us, even taking that other stuff into account. <-- I love Winky, my "periwinkle" (ABP) LGT! - Allen / Usual Suspect "DumboRAT" / One of the Three Stooges '16 Outback, '16 WRX, 7th Subaru Family Link to comment Share on other sites More sharing options...
vkchu Posted February 10, 2009 Share Posted February 10, 2009 "Lies, damned lies, and statistics." Indeed, aside from the "n of 1," other concerns arise - i.e. were there any other differences that may, in any way, affect readings, between the two cited dyno runs - but yep, it's an eye-opener, for all of us, even taking that other stuff into account. subscribed to mr estes' thread to see what he can unearth for us lgts! Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted February 10, 2009 Share Posted February 10, 2009 I will be putting the following parts on by the end of the month/early March GrimmSpeed UP Invidia Catted DP Perrin resonated Mid Perrin Y Prodrive Mufflers NICE set up man! Enjoy! Post sound clips when you're done. Link to comment Share on other sites More sharing options...
Mindspin311 Posted February 10, 2009 Share Posted February 10, 2009 Yea, I def. will. Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted February 10, 2009 Share Posted February 10, 2009 That is a quality set up! No cheap-o bits in there. Should sound great! I have a similar setup, but I have the Perrin cans too. Link to comment Share on other sites More sharing options...
NYtoVT Posted July 20, 2009 Share Posted July 20, 2009 Does this thread need a a bump? My wife's Outback will soon have the stock exhaust with custom WRX headers, Magnaflow muffler and WRX tip. Link to comment Share on other sites More sharing options...
tingtang Posted July 26, 2009 Share Posted July 26, 2009 megan catless UP/DP megan cbe... Link to comment Share on other sites More sharing options...
JSaladino Posted July 27, 2009 Share Posted July 27, 2009 tingtang, how do you like the megan dp? Link to comment Share on other sites More sharing options...
robsontuning Posted July 27, 2009 Share Posted July 27, 2009 Here is my wifes exhaust setup, but I am not finished with it. 4" exhaust off the turbo, and 44mm off the wastegate.http://i132.photobucket.com/albums/q8/robsontuning/new%20project%202009/P1000401.jpg Link to comment Share on other sites More sharing options...
tingtang Posted July 27, 2009 Share Posted July 27, 2009 tingtang, how do you like the megan dp? its been fine so far.... i only had one issue with it though... and thats the bung that comes with the DP for a wideband o2.... for some reason the hole wasnt big enough to actually fit a sensor through... though the threads did match up... yea iknow... kinda dumb how they would make it that way... but all the shop had to do was re drill the hole to make it bigger... then re thread it... so thats what they said.... other than that it seems like a pretty good quality piece... Link to comment Share on other sites More sharing options...
scoobydoobie Posted July 27, 2009 Share Posted July 27, 2009 Exhaust setup: Grimmspeed PnP exh. manifold and Hi-Flow crossover pipe (coated/wrapped)Grimmspeed UP (coated and wrapped)Cobb catted DPStock CBE Link to comment Share on other sites More sharing options...
kmfuse87 Posted July 29, 2009 Share Posted July 29, 2009 stock DP, Stock UP, Stock Y-Pipe, Prodrive cans. Soon to go with Cobb DP. Link to comment Share on other sites More sharing options...
JSaladino Posted July 29, 2009 Share Posted July 29, 2009 are you going with a catted Cobb DP? Link to comment Share on other sites More sharing options...
kmfuse87 Posted July 30, 2009 Share Posted July 30, 2009 are you going with a catted Cobb DP? Yep Link to comment Share on other sites More sharing options...
LGT_Ltd_wagon Posted July 30, 2009 Share Posted July 30, 2009 Cobb catted DP Cobb UP Cobb mid-pipe Cobb Y-pipe AVO mufflers (wagon) very happy nice deep sound sorry no sound clip I will learn how to use the camcorder someday:lol: Link to comment Share on other sites More sharing options...
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