Kev,
I cut off the standard muffler and fitted a 2" straight thru in its
place with a 2 1/4" angle cut tip. Before doing this, I pressure
tested the stock system (after airbox mod) and got a total back
pressure at the manifold of 26kPa at 6000rpm in 3rd gear WOT.
I haven't tested since fitting the new muffler as there is minor
transient resonance at around 3000rpm under hard acceleration, so
I'll put a resonator before the muffler to kill that off before
testing again. Exhaust note is good and not loud or harsh except for
resonant peak. Sounds a bit like an Evo 7 on overrun.
When I get it sorted, I'll give you the numbers and post some pix.
Cheers, Pete.




--- In Jumbuck@..., kevin lyons <klyons64@...> wrote:
>
> Thanks Peter
>
>
> I'll have a look at the airbox.
>
> What did you do to the exhaust?
>
> Kev
>
>
> Peter Scott wrote:
> > Hi Kev,
> > I think I've found a couple of extra neddies with some careful
(and
> > cheap) tuning of the (mostly) stock exhaust. Fuel economy has
> > improved and the needle climbs the tacho much quicker in all
gears.
> > Another thing you might like to try is to pull the restictor out
of
> > the airbox. This is a black plastic tube that is pushed into the
case
> > downstream of the air filter. Unscrew airbox from hose and the
tube
> > just pulls out.
> > This won't give you a massive power rush but it reduces the
airbox
> > retriction by 70% and sharpens throttle response.
> > So far, I've spent about $30 on the exhaust, nothing on the
airbox,
> > and got an extra 70 - 80 km from a tank of fuel, and more torque
> > available down low when towing (6x4 trailer). Other than that,
car is
> > stock with 33000 km on it.
> > Cheers,
> > Peter.
> >
> > --- In Jumbuck@..., "klyons_au" <klyons64@> wrote:
> >
> >> I agree with Peter, that this group holds some good info and I
hope
> >>
> > it
> >
> >> remains.
> >>
> >> I haven't done any mods so nothing to report there.
> >> I did have the head gasket replaced because of an oil leak
though. I
> >> think there was something posted a year or more ago about this.
Mine
> >> has only done 20000 km in just over 2 years. I'm not sure where
> >> exactly the leak was as I didn't see it and, believe it or not,
> >> neglected to have a look before it went in for replacement.All
> >>
> > covered
> >
> >> by warranty anyway.
> >>
> >> I might get keen for some mods sometime but I'm happy with the
> >>
> > machine
> >
> >> as I bought it. If I needed more power I probably wouldn't have
> >>
> > bought
> >
> >> the beast in the first place.(a couple more kw wouldn't hurt
though
> >>
> > if
> >
> >> someone has a couple spare)
> >>
> >> Kev
> >>
> >>
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo!7 Groups Links
> >
> >
> >
> >
> >
>
>
> --
> As you slide down the banisters of life may the splinters never
point the wrong way.
>