I have a auto 1jz loom and ecu with a 5 speed r154 conversion put into an m3 bmw< I have the car running but around 4000 rpm its cutting and spluttering< I have changed the coil packs plugs and ignitor for known good ones and stil the same problems, on researching I have found the following
"with some auto to manual conversions i've done, you'll find you do need those wires, as when you flatten the throttle, and take off up the road, your ecu sees massive load, revs, but no speed as the speed sensor (which is one of the wires to the auto) isn't hooked up, and pretty soon it'll stop the fun, leaving you with an annoying cut out, much like a boost cut. whether this is the case or not for your setup i'm not sure, but i'm pretty sure you'd be better off to grab a manual computer, or figure out some way of 'sensor bending' that sensor (tricking the computer into seeing there is some load, enough to stop the 'cut')."
I have the autobox wires unattached in the engine bay< the neutral start switch must be bypassed further up the loom by the auto electrician as the car runs and drives< but the speed sensor has not been touched< does any one know of a mod to confuse the ecu into this being connected or is it best to leave disconnected as this is not the problem??
"with some auto to manual conversions i've done, you'll find you do need those wires, as when you flatten the throttle, and take off up the road, your ecu sees massive load, revs, but no speed as the speed sensor (which is one of the wires to the auto) isn't hooked up, and pretty soon it'll stop the fun, leaving you with an annoying cut out, much like a boost cut. whether this is the case or not for your setup i'm not sure, but i'm pretty sure you'd be better off to grab a manual computer, or figure out some way of 'sensor bending' that sensor (tricking the computer into seeing there is some load, enough to stop the 'cut')."
I have the autobox wires unattached in the engine bay< the neutral start switch must be bypassed further up the loom by the auto electrician as the car runs and drives< but the speed sensor has not been touched< does any one know of a mod to confuse the ecu into this being connected or is it best to leave disconnected as this is not the problem??