Found this while looking for flow rates on CIS injectors. Think it could be useful for the FI guys still running CIS? And yes, I saw the price....

928 Motorsport's WUR (http://www.928motorsports.com/parts/cisreg.php)

Found this while looking for flow rates on CIS injectors. Think it could be useful for the FI guys still running CIS? And yes, I saw the price....

928 Motorsport's WUR (http://www.928motorsports.com/parts/cisreg.php)

JR can give you the adjustment feature either in tutorial form or provide the service.

Very interesting. I am familiar with warm and cold control pressure adjustment by moving the valve body and spring mount post in or outward in the WUR body, but haven't begun to mess with my WUR to adjust boost enrichment mode, YET.

I am not the end all, be all expert on all things K-jet, so I have no idea how the 928 WUR compares to the volvo 240 turbo WUR, or what the exact modification is require to make it boost sensitive. I would imagine it is simply an adjustment to the maximum range of motion on the secondary spring perch via adjustment of vacuum diaphram travel stop. In more simple terms, they move the brass plug on the bottom of the WUR outward to allow the secondary diaphram to move further under boost. How far to move it ends up being all test & tune.

I have had WUR's apart before and the allen set screw is already there, all you have to do is drill an access hole to adjust it. This will change the pressure of the secondary spring which will adjust control pressures (both cold & warm) throughout the entire range. But it also changes the range of motion of the vacuum/boost enrichment circuit.

I do know that the Volvo 240 turbo WUR and the audi 5000s WUR's are already boost enrichment capable, and good functioning examples can be had for $50-$100.

I currently hit 12.9 afr at WOT and I want to be around 12.5-12.2. My next step with my fuel system is to adjust the travel of the secondary spring diaphram by pulling the lower stop out. My plan is to remove the WUR but leave it plumbed in, then make adjustments while applying "boost" to the boost port to see how much I can change control pressure at 10 psi manifold pressure.