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Summary of change:
Hi, Engdahl here. A customer of mine wants to run a VIPER V10 with VEMS and we therefore have some questions. What do we need to do to run this engine? Please '''specify the trigger'''. See MembersPage/PeepPaadam/BMWwithViperEngine and take notes (eg. copy relevant info here and edit) what is applicable, how it differs, ... We assume '''wasted spark ignition''': 5 ignouts for 10 cyls exact positions (angles) of these TDC events: * ... * ... * ... * ... * ... ---- First: Will Vems allow for ODD fire V10 config? * theoretically yes, we are investigating and retesting (so precise trigger info about the actual trigger is very important) I have tried to change Engine setup in VEMSTUNE to oddfire, but it seems to do nothing. * the key to set up is trigger type, ignchmax, reftooth and per cyl spark delay (odd fire config bit only has effect if RPM is fluctuating because of uneven tooth; Not needed for many setups, eg. if every 2nd tooth neglected by using auditrigger divby 2) How do we go about setting upp the odd fire sequence? My first option is to mess with Trigger reference tooth table. (TRTT) The Viper V10 is a 90 degree 10 cyl engine. 720 degrees / 10 = 72 degrees. And on a 90 degree engine that means 18 degree Odd fire on right-bank cylinders. Correct? If i change TRTT tooths will it still sync the tooth correct after the missing gap? * If i change the order, VEMSTUNE sets a warning. ** for this trigger setup it is very likely that VT will show warning we will have to neglect: there are some special (rarely used) cases the firmware handles but outside "normal-range" for VT What is the other options? The separated cylinder spark delay '''does allow''' for more than 3 degree delay. * VT sets a warning for >3 that can be safely neglected if one knows what he is doing (which usually implies the steps of specifying, asking help with benchtesting). ---- Question 2: Is he want to run full sequential in the future, is there any possibility to get a custom firmware to run 10 inj outputs? * 10 injectors, with 2 injectors on each (5 injector outputs)
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