Link standalone runs closed loop to redline?
07-31-2004, 10:39 PM
#6
Three Wheelin'
Join Date: Jul 2001
Location: Reading PA
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Originally Posted by NZ951
Fuel as in A/F?
special tool if you are interested in the Link you can download the program and play around with it to get a feel for what it can do. I did that when I was looking at the different brands.
07-31-2004, 10:43 PM
#7
Race Director
Ok, the answer is it is staged, you can have it running in certain zones (partial) or full. The problem with running in full is that you spend such little time in the upper revs of the lower gears that its difficult to make all the corrections in a meaningful way. Its best to set targets in partial closed loop lambda and have cruise be nice and economical. Does that answer your question?
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07-31-2004, 11:45 PM
#9
Rennlist Member
It can run closed loop all the time under full load if you program it to. There are user definable setting so you can tell it when you want it to go open loop using a MAP limit. For example, after 5 psi it can go open loop. If the MAP limit is set high, i.e. like 18psi + it will stay in closed loop. NZ described the process the Link uses to set targets for different loads (idle, cruise, light load, medium and heavy). For each zone on the load table you can set voltage targets for the 02 sensor. The link will sample the voltage and correct the current fuel value to meet the target. Corrrection sampling speed is a function of RPM and load. So I guess the answer to your question is yes, it can run closed loop, but as with all stand alones there are multiple configuration options availble to the user. THe danger with closed loop is that the computer trys to compensate for a faulty sensor and for whatever reason foces a lean mixture under load. THe amount the link can actually change a base fuel table is limited depending on whether you have the programmer / pc plugged in or not. Basically your base fuel table has to be fairly close to start with. The link will not allow large adjustments to the base map thereby building in some degree of protection. I sometimes run closed loop off a wideband by using a PLX scaled invertor that converts the 5-0v to 0-1v for feeding it into the Link. Works great.