Does anyone know of a good cold air intake that I can purchase and
install easliy with out too much modification and that will actually
improve the speed of my already "fast"stock 1995 900se turbo five speed
coupe saab? (non convertible)

Also, with out upgrading my exhaust, (which is after market, yet stock)
am I wasting my money! I am tired of hearing my friend (who drives a
cobra) says it will improve my horse power and increase my speed!

p digital wrote:
Cold Air Intakes are a waste of time and money. Your cobra driving
friend is a goof. You will not increase the engine power because the
engine is not limited by the intake flow. If you want more power there
is only one thing that you need to do: increase the boost.

--
-Fred W

in article 1162225585.589496.135720 (AT) k70g20...oglegroups.com, p digital
at phillipdye (AT) gmail (DOT) com wrote on 30/10/06 16:26:

With a turbo car, any cold air is going to get very warm once it has gone
through the charger. To that end, a better intercooler is always going to be
a good purchase, but IIRC the NG900 has a pretty good intercooler anyway.
You could always look at putting a more open air filter into your intake and
perhaps ensure that air is ducted up towards it.

Doubtful! I'm not sure what the stock size is for the NG900, but the C900 is
2.25". 2.5" is good for around 300 BHP and 3" is for serious power nuts ...
Or people who want a noisy exhaust I think yours will be about 2.5". If
you do want to gain a little power in the exhaust, spend your money on a
free-flow catalyser, or "Sports cat". Maybe 5 BHP? I'm sure they'll quote 10
BHP, but I wouldn't be too swayed by that.

Increasing the boost is the way to more power. Reckon on 5 BHP per 1 PSI of
boost increase. You can get good software maps from Maptun for your ECU.
They're costly, but people do rate them.

Paul

1989 900 Turbo S
http://saab.go.dyndns.org/

If you want more speed you need more power. For more power you need to burn more
fuel:
- increase displacement
- increase boost
- increase RPM

Anything else will only be marginal...

--
MH
'72 97 '77 96 '78 95 '79 96
'91 900i
'95 900SE

- Bob - wrote:

I fail to see how the boost would vary with temperature, considering
that the ECU can run the charge up as high as it can until it begins to
detonate. That would be the "hard limit" on boost. When you have that
musch intake pressure going on, it isn't going to make a diddly bit of
difference how free flowing the intake is UNTIL you reach massive flow
rates, at which point you could lose pressure due to the restriction.

I don't have any specs or scientific evidence, but considering how small
the engine displacemnet is, and how low rps these things spin, I still
say any cold air intake, or other fiddling with the intake to "improve
flow" would not net any tangible difference.

Y boost MV

--
-Fred W

On Thu, 02 Nov 2006 14:32:51 -0500, Fred W
<Malt_Hound@*spam-me-not*yahoo.com> wrote:

I have to say, I disagree a bit here too. Like you say, the boost
*pressure* won't change, but if the air is cooler, then the mass will
be greater for the same pressure. I agree though, that any increase in
peak power due to just fitting a CAI will be pretty marginal.

If you can do something to the intake that genuinely increases flow,
then it's still worthwhile, even though the boost pressure is limited.
It might not increase peak power, but IME, it really can help
off-boost where the boost limit doesn't apply.

I've got no figures, but I recently changed my air filter for a new
standard one. The old one had done 60K miles. My bum tells me that the
9-3 is now slightly faster off boost, has a slightly lower boost
threshold and shows a bit less lag. It could all be in my mind, I
suppose...

Cheers,

Colin.

- Bob - wrote:
OK, so you're saying that in the cooler weather, your manual boost
control allows higher boost pressure which results in more power? Well,
wasn't that my whole point all along? Yes, in a normally aspirated
engine colder (denser) air results in more power. But we aren't talking
about NA engines here... I said the way to increased power is increased
boost all along. I was just advocating doing it with an improved
software map in the APC (Automatic Performance Control) instead of a MBC
and colder temps.

The bigger advantage to sticking with an APC being that the APC can back
down the performance marginally if / when you have to run lower octane
fuel or as weather conditions & altitude vary. It does that by
monitoring the ignition performance through the direct ignition
cassette. In that way, with the right software, you can run the boost
right up to the point of preignition. With a MBC you need to leave some
margin so you don't get detonation, or risk blowing the engine.

But I'm not saying the stock APC program will do all of that. Just that
the potential is there with remapped software.


--
-Fred W

Install water injection