BIC Downpipe Question

89turbosupra

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Jun 10, 2006
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I just put my bic ddp and test pipe on and it spools great. I havnet got on it hard but i can feel the diference. The only problem is I can hear the exhaust comming out of the dump tube and it sounds ricey when I take off. Is that normal? or is something wrong?
 

suprahero

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Mine is freaking loud. I don't think it sounds ricey, but it is a little too loud. If I had it to do over again, I would probably get the one that's run back into the dp. You get used to it after a while..............lol
 

IJ.

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Mar 30, 2005
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I doubt you'd lose any HP due to volume of flow being low but it would make it much nicer to drive!
(all it takes is one badly timed squirt to get the wrong sort of attention)
 

89turbosupra

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I like the sound coming out the muffler especially the turbo whistle.I dont like the exhaust leek sound coming from the dump tube at idle it sounds nice under boost.
 

Insidious Surmiser

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May 12, 2006
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IJ. said:
I doubt you'd lose any HP due to volume of flow being low but it would make it much nicer to drive!
(all it takes is one badly timed squirt to get the wrong sort of attention)
yeh, it's happened before, but i havn't gotten into any trouble YET... i think i'll wait till i upgrade my turbo (external wg) to do my exhaust again.... i'll probably have it run through the muffler then, but have a exhaust dump w/ a butterfly valve controlled by an electric solenoid :evil2:
 

Insidious Surmiser

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May 12, 2006
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89turbosupra said:
I like the sound coming out the muffler especially the turbo whistle.I dont like the exhaust leek sound coming from the dump tube at idle it sounds nice under boost.
i actually like the sound of open dp more than anything, but it's too loud for practical use...
 

97TSiAWD

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Jul 18, 2006
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89turbosupra said:
I dont like the exhaust leek sound coming from the dump tube at idle it sounds nice under boost.
It's loud at idle? It should only be loud when the wastegate is open (when you're at full boost).
 

MassSupra89

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97TSiAWD said:
It's loud at idle? It should only be loud when the wastegate is open (when you're at full boost).


I think he means the exhaust leaking from the 3" section and into the WG dump tube, a small amount of exhaust air can leak out through that.
 

97TSiAWD

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Jul 18, 2006
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MassSupra89 said:
I think he means the exhaust leaking from the 3" section and into the WG dump tube, a small amount of exhaust air can leak out through that.
So that small section that separates the wastegate and turbine exhaust gases isn't quite the right size? Is that a common occurrence with the DDP? (I was planning on ordering one within the next couple of days) :)
 

MassSupra89

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Mine isn't noticable, I hold my hand over the WG tube and i can barely feel a breeze coming out. In my opinion its nothing to worry about.
 

shaeff

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97TSiAWD said:
It's loud at idle? It should only be loud when the wastegate is open (when you're at full boost).

the wastegate begins opening pretty much as soon as there's positive pressure... it's fully open at 5.5-6 psi stock. there's no way to keep it totally shut until full boost is reached unless you have an EBC.

-shaeff
 

suprahero

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IJ. said:
Would a bike muffler fit on the end of it?


I thought about this IJ, but the way it's made, I don't think that you can get anything on it. It's a 1 1/2" pipe, but it's only like an inch away from the exhaust pipe. I'd have to see a small bike muffler to see if it would work. I would probably do it if it would fit. It's not SOOO loud that I don't want to drive my car, but it is kind of annoying sometimes. It doesn't seem to bother me if I'm spanking a Mustang Gt though.....................lol