[200q20v] RE: 200q20v digest, Vol 1 #733 - 9 msgs

[Brian Link]

I agree with this,
My k-24 at 21 - 22 psi and 5300 ft wasn't long for this world, but I didn't
want to back off the boost to 16 psi.  So I installed a garret hybrid
T3/T04,  AR .49 (if I remember correctly). This is supposed to be similar
to the RS2 turbo.  Yes there is more lag (not much), but the car pulls much
stronger in the mid and upper rpm's.   I also have noticed that the boost
is not pulled back as fast as the k-24 after 4500 like the k-24 did.  I
don't know if it is the colder outside air temps, or the new turbo is not
heating the air up as much, or if the old k-24 was at it's upper limits.
 I'm very happy with it.  I suppose I should look at improving the stock
intercooler, but I don't know where it is lacking for most of my driving.

Brian



Date: Sun, 20 Jan 2002 06:50:27 -0800 (PST)
From: Neil Swanson <neilsphoto at yahoo.com>


With an RS2 turbo the air it produces at high turbo
speeds is denser, less hot than a K24 and will make
more HP than a K24 at the same speeds/boost levels.
These speeds and boost levels are in its range.  Whic
is the pooint of this or any turbo upgrade.  To
maintain cooler/denser air up into the high rpm range.

IA and MTM can hold that higher boost pressure longer
and into higher rpm than they can with a K24.   Equals
more HP and torque.
An RS2 car pulls hard longer than a K24 car.   The
extra high rpm performance in an RS2 car is noticable
and is there because the RS2 is meant to run
efficiently in those ranges/boost levels.

An RS2 turbo will nearly always be putting out denser
air able to make more power than a K24 even at 1 bar
boost.   BTDT on Ford 2.3 turbos.  I made more power
on LESS boost and that was even keeping the same
exhaust housing.

Also note that many Porsche turbo and intercooler
upgrades still run at only 1 bar boost but make more
power than stock turbos.

Dense air is what it is about.

You do of course loose some low speed response but
this is expected and not news.
Snip

Hope this helps

Neil