[mark houghton]

I also run with a K27 7006 and just last weekend finished installing my LC-1 AFR gauge...along with an adjustable WUR courtesy of Brian Leask. Brian pre-set the control pressures based on my modifications and the boost I run at.

So, the first run out the door...boost control set at .8bar, steady state crusing with no boost had the AFR's right at 14.0. I could probably lean her out just a hair, but it's close enough to stoicheometric. Full boost had it richer than needed....10.5. Oh...I forgot...I also installed a simple solenoid and MSD rpm activated switch set to open at 3200 (way too low, but that's where I started just to safely make sure it was working).

Next, back in the shop, I dialed up the boost to .9 bar (which is where I intend to run most of the time, or up to 1.0 when the mood strikes me) and put a 4200 rpm chip in the MSD (to delay boost enrichment until then). Out for a spirited blast and the full .9bar boost AFR settled in from 11.8 to 12.0. At about halfway through the boost build (say around .5bar) I'm seeing AFR's dropping to around 13, then continuing on down as rpm's build and the WUR starts enriching.

If this helps, my control pressures are as follows: COLD: 2.0, WARM 3.75, enrichment 2.5. Still have some tuning to do, but overall I'm happy with it. Need to hook up my laptop in the car and see if I can figure out how to map everything.

To get rid of your fat midrange, try installing as I have done the rpm switch/solenoid on pressure feed line to the WUR. You can buy the complete setup from Brian (and you will get nothing but extreme quality workmanship and support), or source the parts yourself as I did.