the "0" on the flywheel

[tmb]

> Aha! I know what your problem is, again BTDT.

that's why i love this list so much.  real world
experience.
 
> The stock turbo doesn't flow well enough for
> increased boost levels at high 
> rpm. If you watch your analog gauge (you DID
> install one before turning up 
> the boost right?) 

yup.  it's a stewart warner guage that shows up
to 25psi.

> you should notice that while
> you are running 1.6bar (you 
> did turn it up that high I assume) 

sorry, do you mean 1.6BAR (23.5psi), or 0.6BAR
(8.8psi)? 

> at mid
> range, the boost will drop off 
> after ~4500rpm until arround ~5700rpm its down
> to about 1.0-1.1. Loosing 
> .5bar boost make the top end feel like crap.
 
hmmm.  time for a test...

...test complete.  the car pulls with the same
urgency throughout the rev band.  car peaks at
about an indicated 17psi, and stays there til i
shift, or get off the gas.  the air/fuel meter
shows rich the entire time i've got my foot in
it.

first gear: 6750
second gear: 6250
third gear: short shifted at 5300

this was on a...uh..."closed circuit" not far
from here.  i'll be doing more experiments as
time and lack of traffic permits.

i'm starting to get a little more used to the
ticking sounds i described earlier on.  i'm not
super scared of them anymore.  my old 2.0 16V
used to make the same sounds and it was
attributed to the knock sensors doing their
thing.  i'm not yet ready to assume the same
thing, but i'm getting there.

god this car hauls a lot of ass.  i wanna go
punish some V8s.

as a side note, the audi guage shows 2.0BAR while
the mechanical guage shows 17psi.  so it's likely
about 1.09BAR which is about 16psi.

> Also I had to port the hell out of my cyl head,
> IM and exhaust manifold to 
> get my 10v to flow worth anything over 6500rpm.
> With the 10v the top end 
> will never be quite as good as it should be,
> but with the right tricks you 
> can get it pretty decent.

that'll be for the next project.  at the moment,
i just want to make sure that this lump is
running mint.  then, in about 8 months' time,
when the fuel pump cacks, or the fuel lines snap,
or the fuel tank leaks, i'm going to be parking
the car til i can afford to do a 4KTQ swap.  i'm
so giddy just thinking about it...
 
> BTW/FYI - I'm not sure about the MC-2 since the
> compression is higher, but 
> my MC-1 would take whatever boost the turbo
> would dish out when tuned right 
> on 93 octane. 

i think that "tuned right" are the keywords.  i'm
running 94 in there, so i octane shouldn't be an
issue -i hope.

> With the exhaust system that
> means 1.6bar, without the exhaust 
> after the downpipe it would run 1.8bar. 

the cat has been taken out of the equation for
testing purposes, and i really need to replace
all of the remaining 17 year old pipework as it's
leaning all over the place and leaking in spots.

> That
> said, you are really waaaaaaay 
> outside of what that turbo is designed for and
> on anything but a cold day 
> it's pointless to run past ~1.4bar due to the
> turbo heating the charge past 
> the acceptable limit. On a cold day the
> intercooler fixes this issue.

looking forward to the winter.  just need to get
the old girl some nice sticky winter boots.

jason
tmb

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