RE: Anyone tried a Supertrap on an Alfa?

["Brian Shorey" <bshorey@xxxxxxxxx>]

i've got a supertrapp on my spider.  modified head, shankle headers, no
center section, ansa rear section (although for a while it was straight pipe
front to rear), supertrapp at the back.

very effective.  no noticeable difference in power with all the baffles
removed (i.e. fully open) and a dozen of them in place, but lot's of noise
reduction (although still quite loud).  for me, loss of power starts when
there are only four baffles in place, six to twelve is much better.

i don't know how the fumes will work with the rear hatch on an alfetta
coupe.  the supertrapp disburses them uniformly radially, so if your hatch
seals aren't good then fumes could be a problem.

hope this helps,

bs

> -----Original Message-----
> From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided]On Behalf Of
> Stefano Iachella
> Sent: Wednesday, December 02, 1998 12:28 PM
> To: alfa-digest@domain.elided
> Subject: Anyone tried a Supertrap on an Alfa?
> Importance: High
>
>
> Hey cats,
>
> Has anyone tried a Supertrap muffler on an Alfa 4 cyl?
> The one with the removable plates for control of backpressure.
>
> I see one at a local shop for a great deal and I got to
> thinking because of my exhaust configuration: I recently
> put on the Shankle header on my Alfetta. It turns out
> that I have a hollowed out cat and 2" pipes all the way
> back. I noticed some improvement between 5 and 6
> thousand rpm and it wants to keep pulling into the redline.
> (can I take it into redline?) Low end has no improvement,
> maybe even worse.
>
> I was thinking to try it out to see if I can get back some
> backpressure to move the power band down a bit. I'd
> like some get-up-and-go down low. I have an exhaust
> tip that is turned down, so I have no problem with fumes
> (Alfetta GT). Any thoughts on what it would do to that?
>
> I plan to put a real cat on in one year, when my next
> smog is due. Being able to retune the exhaust when I
> do this should be good, no?
>
> Other points - '79 California intake stuff, '74 engine (i.e.,
> cams and Spica unit from a '74). Air pump operational.
> K&N filters. No headwork (so far).
>
> Another thing - does the mixture need to be adjusted
> to accommodate all that free flow?
>
> Incidentally, that header makes the whole exhaust system
> sit real low. The clamp, collector, and cat scrape over
> just about everything. It just clears the bottom of the
> engine, so it can't get any higher there. Anyone experience
> this and try getting the pipe bent up a bit after the engine/
> before the collector? It looks like there's some room
> there.
>
> Sorry I didn't number my questions, I started off with just
> that Supertrap question and I just kept going. Everything
> seems related.
>
> Thanks for any advice or thoughts.
>
> Stefano
> Oakland, CA
>
>

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