[200q20v] RS2 & 3B - Fueling Around

Brett Dikeman brett at cloud9.net
Sat Jan 19 21:52:48 EST 2002

At 4:54 PM -0800 1/19/02, Greg Johnson wrote:

>Baseline: the brakes and suspension have been upgraded. I had a
>custom-built mandrel bent exhaust system with high flow cats and a high
>flow muffler installed. A K&N panel filter resides in the stock air box.
>I'm running IA III+ software with a 2.5 kPa transducer.
>Oh yeah, we live at about 2000 feet above sea level.
>Upgrade: I want to add some RS2 parts. I don't want to do the full RS2
>monty (beyond my budget) but I would at least like to add the RS2
>manifold and turbo.

I would think it would be possible to do just the turbo+manifold, but
why bother...you'll get better performance from a $500 chip than you
will from $2000+ for the above two components, -especially- since the
RS2 turbo takes longer to spool up.  You should understand that
switching turbos will NOT change the max boost level you see; it
won't add any HP, because across the board, the ECU is the
restriction, not the turbo.  You'll have to talk to Ned about getting
new chips for the ECU.

The manifold is a smart investment if you plan on running high levels
of boost etc, but otherwise adds only minimal power in and of
itself...less than 10hp I think.

>Question: is the stock 3B fuel system sufficient to handle this upgrade,
>or will it be lean at full boost and cause my engine to be at risk?
>What happens if I add the RS2 MAF to the equation? Does this help the
>potential fueling issues or does it exacerbate the problem?

The ECU, injectors, and MAF are a package together...you can't
partially upgrade.

>If there is a fueling issue, will either camshaft help?

Nope,  cams have nothing to do with not enough fuel(or too much fuel.)

>BTW, I've heard that if you add the RS2 injectors to a stock 3B fuel
>system, it runs too rich.

Correct, they're higher flow for the same pulse width+pressure, one
of the reasons for the ECU mod.

HTH(and I hope I got everything right :-)

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin
http://www.users.cloud9.net/~brett/bdikeman.asc	(PGP Public Key)

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