Does a dumptube need to flare out to larger diameter if welded to downpipe?
Does a dumptube need to flare out to larger diameter if welded to downpipe?
...Or, is it ok to run 1.5" all the way from the 35mm flange, as long as it's at least 18" past the turbo and re-merges at a narrow angle?
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Re: Does a dumptube need to flare out to larger diameter if welded to downpipe? (USE2B16A)
Sounds like that will be fine. No need to flare. However, maximum HP will not be seen with a rerouted Wastegate dumptube. Why not just dump to open atmosphere? Much less work with much better results.
Re: Does a dumptube need to flare out to larger diameter if welded to downpipe? (msmotorsports)
I've read through all the threads I could find. The FMAX 40hp loss was due to a bad design on their part. If done properly, there should be little to no hp loss. Even if I lose 10hp, it's worth it to me. I hate the sound, and really look forward to having a clean sounding car again.
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From: west hills, ca, united states
Re: Does a dumptube need to flare out to larger diameter if welded to downpipe? (USE2B16A)
If sound is you focus than merging with the downpipe with as minimal angle possible will be your best bet.
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Re: (lucidvtec)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bubs »</TD></TR><TR><TD CLASS="quote">Don't mean to hijack your thread, but is it really better not to have it going in at an angle? I've been thinking about doing the same thing because I don't like the open dump sound.</TD></TR></TABLE>
You want it to go in at a narrow angle.
lucidvtec, what size wastegate are you using, and what is the diameter of the dumptube?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wantboost »</TD></TR><TR><TD CLASS="quote">one guy was running the fmax kit that dumps the wg right in 3" after the turbo... went open dump and gained about 40whp</TD></TR></TABLE>
I read about this, but I think it was a test done by FMAX. The link doesn't work anymore. Anyway, 3" is way too close, and that's one of the reasons why there was a 40whp difference.
Right now, my main concern is purchasing the properly sized piping for a 35/38 mm wastegate.
You want it to go in at a narrow angle.
lucidvtec, what size wastegate are you using, and what is the diameter of the dumptube?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wantboost »</TD></TR><TR><TD CLASS="quote">one guy was running the fmax kit that dumps the wg right in 3" after the turbo... went open dump and gained about 40whp</TD></TR></TABLE>
I read about this, but I think it was a test done by FMAX. The link doesn't work anymore. Anyway, 3" is way too close, and that's one of the reasons why there was a 40whp difference.
Right now, my main concern is purchasing the properly sized piping for a 35/38 mm wastegate.
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