new to WRX, new downpipe, no boost - Subaru WRX Forum
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post #1 of 16 Old 03-21-2011, 10:47 AM Thread Starter
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new to WRX, new downpipe, no boost

I just got my 04 wrx two weeks ago, runs great, but i just put a 3 inch DP on it and it was running fine for about ten minutes, then my boost just cut out and its just running vacuum, it does go a little over 0 on guage but then drops right back to vacuum. I have been reading on here and it kinda sounds like my wastegate is sticking, any suggestions??


Thank you,

Matt
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post #2 of 16 Old 03-21-2011, 11:07 AM Thread Starter
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ok...so it the wastegate stuck, I loosened up the downpipe a bit and it popped back. So does anyone know why it would do that?? It is a divorced wastegate DP so I guess it just got stuck on the lil tab that seperates the exaust gas from the wastegate gas?
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post #3 of 16 Old 03-21-2011, 12:41 PM
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Cut the divider out

Paul
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post #4 of 16 Old 03-21-2011, 01:00 PM Thread Starter
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Quote:
Originally Posted by pzr2874 View Post
Cut the divider out
Would'nt that eliminate the purpose of a divorced DP?
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post #5 of 16 Old 03-21-2011, 01:05 PM
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bellmouths are better anyways

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post #6 of 16 Old 03-21-2011, 01:10 PM Thread Starter
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I've heard good reviews on both and that if one is better than the other that the power gain would be so minoot that it wouldnt matter, like I said though, im new to rex's.
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post #7 of 16 Old 03-21-2011, 03:58 PM
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it's not peak power thats different, from my experience bellmouths yeild a more robust power curve and slightly faster spool

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post #8 of 16 Old 03-22-2011, 01:37 AM
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Plus, most divorced pipes don't really divorce them for a significant portion of the pipe, so it's a moot point. I'd use a grinder and cut it out. The way I see it, even if you have to buy a grinder at Home Depot it's cheaper than paying a shop to cut it out, even buying the grinder disc that will cut through a 1/4" thick plate of metal.

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post #9 of 16 Old 03-22-2011, 06:31 AM
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And wrap that sucka afterwards

Paul
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post #10 of 16 Old 03-22-2011, 09:07 AM
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Wrapping the DP is really insignificant what you really want to wrap is the exhaust mani and up-pipe.

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post #11 of 16 Old 03-22-2011, 10:21 AM
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Because no one has really done any testing ? Please... Any piece of exhaust can be wrapped and will help with heat... Under the hood or otherwise.

Paul
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post #12 of 16 Old 03-22-2011, 10:38 AM Thread Starter
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Its already wrapped...I guess I'll pull it back off this weekend and grind that divider off. Thanks for your help.
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post #13 of 16 Old 03-22-2011, 10:41 AM
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The purpose of exhaust wrap isn't to lower engine bay heat, it's to retain the heat in the exhaust for turbo spool. It's simple thermodynamics, you want hot exhaust pre-turbo for the increased velocity to spool the turbo quicker but after the turbo retaining the heat won't have any benifit unless your running a tiny exhaust and need the high velocity exhaust to avoid back pressure. Now if our cars ran rear mount turbo setups like the STS kits wrapping the entire exhaust would be warranted or if the exhaust ran close to heat sensitive items like the gearbox and would boil the fluid

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post #14 of 16 Old 03-22-2011, 11:31 AM
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But wrapping the DP WILL and does help with underhood temps.

Paul
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post #15 of 16 Old 03-22-2011, 12:32 PM Thread Starter
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I agree, i think heat wrapping the DP helps under hood temps, especially without a heatshield
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