Thanks guys for input
Just a couple of comments and questions
Originally Posted by
Rick
The fluctuation is the closed loop control. You should speak to MSD, they may have set the ignition timing to match the current WOT fuel.
very good point didn't think of that - but still 10....
unfortunately Stu is not in the office at the moment, so will have to wait til his back.
Originally Posted by
vroooom ptssssh
What is you're fuel pressure set to? what injectors?
3 bar at idle as per Stus instructions, dark greens.
My fuel pressure peaks at 5,6 bar according to the SPA.
Originally Posted by
foreigneRS
it has to on closed loop control as the sensor is non linear and essentially is just a switch so that the ecu knows it's either rich or lean so it cycles around that point.
adjusting your global modifier will affect the whole range whilst out of closed loop (with attendant potential problems as already mentioned by Rick), but as you seem to understand already there should be enough adjustment available by the closed loop control for it to be able to stay under closed loop control around stoich at idle and cruise.
But why doesn't it cycle on idle? - it sits perfectly at 14,7
To my knowdledge I can go adjust +-25 on the IAW monitor and still maintain closed loop operation on cruise etc. as you also explain (1 turn in either direction is about +-15 on the IAW) I have actually tried going from the centralized CO screw to 1 turn leaner, and it made no difference to WOT that I could see.
Originally Posted by
James90RS
I've been there mate, and I'd just get someone to set it up
Your not the first on this thread to suggest that. And although it does seem a good idea, I do feel that I should wait for the tuner who made the chip in the first place to clearify. Being an of the shelf chip, I did also make the choice to save some money and sacrify a little on the 100% perfect setup. I just find the readings a bit strange. Another issue is that, here in Denmark I wouldn't know who I would trust to make adjustment
Originally Posted by
Mark Shead
The stacks I have seen all show rich under boost, So I would guess its about right, Get it checked by someone has a good meter and not a cheap gauge.
Mark
In you mind, what is a good meter - for dashboard installation ?
I recall some high powered cars to run these - are they really that bad?
Originally Posted by
JanDK
Would it make sense that a live mapped car would have some much nicer afr numbers compared to a of the shelf chip, wich I would believe would be made safe (obviously from the same company)
what I have thought, but didn't think it would be this much.
another aproach is that the chip is fine, but I have a fault somewhere.
What could cause this besides the chip being set to this
I mean what faults could cause this?
knowing that no sensor faults is shown on the IAW monitor.
thanks again
