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Walt Fricke Walt Fricke is offline
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Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
1) The stock CIS has two screw adjustments - one is the idle bleed air screw, which bypasses a closed throttle butterfly at idle, leaning the mixture. This is how we are told to set the idle speed with the stock CIS. Obviously, I think, you would do this with the WUR/engine warm. Should work with the Franken CIS WUR, I'd think, even though a program can also do this? But I think this is something a guy could just play with, to see what the best way to adjust might be - perhaps set it, then use the programming to fine tune?

The other is the emissions control screw, if you will - the small socket head screw sometimes hard to engage with your small long Allen. In the stock CIS, the geometric effect of this setting is going to influence the relationship between the air sensing plate and how far up the central fuel distribution piston is pushed. With the Franken WUR, again the programming can influence the counter pressure on the top of this piston. Again, I'd think you could use some sort of standard setting, and then use the EWUR or the EFV or some combination to do any further adjusting. The programing/recording ought to let you know what you might want to do with the various settings to get the AFRs you want.

2) I am still in the dark about this one:
VE2 table. The "default" table is all "1"s. How does that compare with the regular CIS duty cycles of 50 or 55 or 65 etc? I get that the FWUR should just adjust the control pressure (absent deep tuning which suggests using it with more precision) pretty much the same as the WUR does. And the FV then tunes things based on inputs. What would a base VE2 table look like?

Helpful hints make clear that setting the FWUR at 100 is a good place to start (and maybe can just stay there if the FV is being used), but I've not been able to find a suggestion on where to start the FV table. I don't understand the rationale for the default/starting program to populate the FV table with all 1s.

I raced all summer with the stock CIS because I couldn't get everything to work - I was glad I had set things up so I could pretty much just put the WUR back in and hook back up the stock ECU. But I'd like to get this going for next season.
Old 10-25-2021, 02:40 PM
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