I have been fighting an overly rich [boost] condition with my CIS. I have a BL WUR with 4800 RPM Pill installed. And, all 6 injectors replaced about 1-yr ago...
I've got the CIS test gauge and use it regularly. And, always log my changes. In looking at the history, I see the following: [WP=Warm Pressure and EP=Enrichment Pressure]
WP: 3.75
EP: 2.1 - [1.65 BAR difference] the way it was shipped from Brian Leaske on 4/09 - so rich it "bucked the car under boost..."
WP: 3.8
EP: 2.5 - [1.3 BAR difference] 9/18/09
WP: 3.85
EP: 2.9 - [0.95 BAR differnce] 11/4/09
WP: 3.85
EP: 3.1 - [0.75 BAR difference] 2/6/10
WP: 3.85
EP: 3.2 - [0.65 BAR difference] 4/10/10
WP: 3.9
EP: 3.3 - [0.60 BAR difference] 5/20/10
WP: 4.1
EP: 3.55 - [0.55 BAR difference] 9/21/10 - Today
After doing today's adjustment, I took it for a spin. I noticed that my AFR's have increased from 13.8 to 14.1 at 1500rpm cruise - as expected...
BUT, as i increase the RPM, the afr's slowly and steadily drop to about 13.0 at 4500rpm [and NO BOOST]. This means, I only need about a 1.5 AFR drop at the onset of boost when the 4800 pill hits...
My question is: Is this constant AFR drop normal as RPM' increase and no boost with CIS?
And, Could my mechanic have put a larger flow injector in?
What could be causing this situation where fuel is increasing greater than the air as RPM's increase under a NO-BOOST situation?
A fuel head mod that I'm unaware of?
Thanks CIS brain-trust!!
