Post by
DRIFTEADOR »
https://forums.nicoclub.com/drifteador-u23379.html
Wed Feb 08, 2006 5:25 am
yes, the emanage pressure sensor recognizes vacumm. fyi, its the same sensor that the greddy boost gauge uses so if you have a greddy boost gauge you dont need to buy an extra sensor, just hack up (there's information on on the web on where to find a plug that fits the emanage) or buy the harness. if you dont have a gauge get it and kill 2 birds w/ one stone.
why you'd want to tune in vacumm i don't know. the motor shouldn't need any extra fuel off boost, it would be running like stock, you only want to add fuel and pull timing DURING boost. another reason to use the pressure sensor. i'm with virus, imo, the pressure sensor makes tuning easier all around. not only with fuel but with timing as well. its easier to retard timinng .50/.75/1/whatever you want degrees per pound of boost basing off pressure rather than airflow.
what i would recommend is getting the pressure sensor, adjusting for injector size, and adjusting timing before tuning to compensate for the injector size change, before tuning. that way you start off with base/stock timing. heres whats supposed to be a stock timing table, converted to pressure, that i saved a while back. iirc, it was posted by enthalpy:
100kpa is 1 bar, represented here as atmospheric press. not boost
for example, to make it easy we'll say 550cc injectors, twice as big as stock, for a 50% correction. if the ecu is seeing half the maf output then timing at WOT (100kpa) should be what the table shows for 50kpa. from left to right:
13, 25, 35, 39, 40, 38, 39, 37, 35, 35, 35, 35
insteado of:
5, 15, 20, 23, 26, 27, 24, 24, 24, 24, 26, 26
subtract and you get:
8, 10, 15, 16, 14, 11, 15, 13, 11, 11, 9, 9
so your 100kpa line on the emanage timing map should read something like
-8, -10, -15, -16, -14, -11, -15, -13, -11, -11, -9, -9, before any tuning is done
this may not be dead on, but its a good basemap
btw, virus, i remember you had a consult port logger, can you verify any of this