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Re: Schrappnell Knobben (R)eport
At 06:03 PM 9/11/97 -0700, you wrote:
>I bought an IA modified ECU for the ur-q, but was sent a stock urq WG
>spring, meaning that I don't get much improvement. Today at lunch I
>was digging under the hood and got the bug to finally install the pres-
>sure regulator and connect it to the top of the WG. I don't know where
>most folks tap into manifold pressure ... I T-ed into the larger dia-
>meter line that bypasses the throttle body when the A/C compressor is
>enabled, and chose the line that is attached before the throttle body.
>I wanted to report my findings and see if I could get some feedback
>from others out there that have installed the kit ...
I T-ed into one of the 3mm rubber hoses coming out of the back of the
intake manifold (BTW, car is a 1990 200tqw).
>Since I am still using the stock MP gauge I didn't want to get too
>aggressive, so I adjusted the regulator to provide max MP of 2bar as
>measured on the gauge. It appears that the actual amount of pressure
>applied to the top of the WG was 2 PSI to achieve this boost level.
>I was wondering what sorts of boost levels others of you are running
>with your S-Kn equipped engines, and what sort of pressure settings
>these would imply on the pressure regulator.
I'm running an actual max 12psi (as measured by a gauge tapped into the
back of the manifold). Schrappnell Knobben seems to provide a 5/8 ratio
(in other words, .5 bar on the stock dash gauge is actually about .8 bar
>I currently have the
>pressure regulator suspended in the hoses near the ignition coil ...
>has anyone mounted their regulators somewhere in the engine compart-
>ment or cockpit?
I drilled a hole through the plug in the third outlet on the Knob, put a
bolt through it facing out, then bolted it neatly onto a bracket on the
firewall....looks clean and neat (it's a bit heavy to just hang on all
those hoses). I avoided the cockpit mounting because of the tempation
factor. By the way, it's a great 'valet' switch....a few turns under the
hood and max boost disappears into the toilet.
>Now that I've got the thing installed I'm going to be looking for a
>one way valve that I can use to allow the pressure to be held on the
>WG even after the boost has gone down, so that way I'll have the stif-
>fer effective spring before the boost comes back. This was discussed
>on the list sometime back, but I never heard if anyone actually did it.
Hmmm....I'd like to hear more about that too.
>I guess I'll need to do some timed runs to see how much performance
>improvements that fraction of a bar provided, but it _seems_ small but
>perceptable ... and it is fun ... :)
After spending months baselining the car back to stock (fixing hoses,
vacuum leaks, throttle switch, etc. etc), I was going 30-70 in third gear
in about 14 seconds. Just adding the Samco turbo/intercooler hoses and the
Knob mod (set to about 12psi), I could do the same run in 9 seconds. Works
>San Jose, CA (USA)
Steve Manning: firstname.lastname@example.org
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