External wastegate - Pros and Cons
02-08-2009, 01:43 PM
#24
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SuperTrapp 344-2005 - SuperTrapp Disc-Only Mufflers - summitracing.com
than a bellmouth. That would be the easiest solution at this point, rather than having to deal with mocking up and welding a new 2.5" downpipe.
External gate controls boost way more presisely. Dont know about power gains from it over an internal, but I wouldnt think them to be that big. They cost money and a bit more work to plumb in (assuming you dont already have a ewg ready setup)
Internal is OK but definitely not as precise or good as external. I chose to go internal on my setup, just for the simplicity of having it on the turbo and what not. I know, not a really good reason but w/e.
Internal is OK but definitely not as precise or good as external. I chose to go internal on my setup, just for the simplicity of having it on the turbo and what not. I know, not a really good reason but w/e.
Do you have any data on what typical gains are on a stock TD04 using a bellmouth? dyno plots, datalogs etc or even just a number would be helpful.
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02-08-2009, 03:18 PM
#25
Yes, I realize my downpipe is not optimum, that's why this thread. If I decide to retain the internal wastegate, I would rather do a divorced muffled dump tube using one of these:
SuperTrapp 344-2005 - SuperTrapp Disc-Only Mufflers - summitracing.com
than a bellmouth. That would be the easiest solution at this point, rather than having to deal with mocking up and welding a new 2.5" downpipe.
Define precise. If its no better than what I can achieve with EBC and the existing internal setup, then its too much hassle really.
Do you have any data on what typical gains are on a stock TD04 using a bellmouth? dyno plots, datalogs etc or even just a number would be helpful.
SuperTrapp 344-2005 - SuperTrapp Disc-Only Mufflers - summitracing.com
than a bellmouth. That would be the easiest solution at this point, rather than having to deal with mocking up and welding a new 2.5" downpipe.
Define precise. If its no better than what I can achieve with EBC and the existing internal setup, then its too much hassle really.
Do you have any data on what typical gains are on a stock TD04 using a bellmouth? dyno plots, datalogs etc or even just a number would be helpful.
IMO:
Dual port EWG + MBC is better than internal WG plus EBC. Both would spool about the same, but mine will not overshoot, or require tuning, or change when temps drop, etc.
Brake boosting:
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02-09-2009, 02:18 AM
#27
Yes, I realize my downpipe is not optimum, that's why this thread.
Define precise. If its no better than what I can achieve with EBC and the existing internal setup, then its too much hassle really.
Do you have any data on what typical gains are on a stock TD04 using a bellmouth? dyno plots, datalogs etc or even just a number would be helpful.
Define precise. If its no better than what I can achieve with EBC and the existing internal setup, then its too much hassle really.
Do you have any data on what typical gains are on a stock TD04 using a bellmouth? dyno plots, datalogs etc or even just a number would be helpful.
bellmouth downpipe with 3" exhaust and tuning usually nets a good 40whp on wrx's that I have seen. May be a bit more may be a bit less. The response and torque curve jumps significantly, and while the td04 still runs out of breath up top (on a subaru) it is still way better than with that pos plate with small pipe that they call a downpipe that it comes with stock.
I would just keep the iwg if I were you. You are already done with your build and have it set up this way I'd leave it. But thats just me. If you were starting on a build right now I'd recommend ewg though.
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02-09-2009, 07:37 AM
#28
I need to look for some reviews.
Edit: Seems to be noisy for DSM guys. Would cost a fair bit more than just rerouting back into the DP for me anyhow.
Last edited by DragonsMaw; 02-09-2009 at 08:01 AM.
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02-09-2009, 10:41 AM
#30
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Stole this from the downpipe FAQ over at NASIOC.
Go all the way to the right.
And hook it back in. If you buy one big 1 3/4 j-bend from Summit, you'll have more than enough curves to do that. I've driven cars that dump separately, and you can't get on boost without everyone in a mile radius knowing about it.
Stole this from the downpipe FAQ over at NASIOC.
Go all the way to the right.
And hook it back in. If you buy one big 1 3/4 j-bend from Summit, you'll have more than enough curves to do that. I've driven cars that dump separately, and you can't get on boost without everyone in a mile radius knowing about it.
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