Page 2 of 2
Posted: Mon Sep 11, 2006 9:38 pm
by ftl
MS2/V3. I'm using a 1ms open time and 25% PWM. I don't think I have changed that for 150 miles or so.
Hmmm, could it be that the Delphi spec of
Driver 4/1 P&H
for the TBI700 inectors means Peak & Hold with a 4:1 ratio? That would imply that a 25% PWM would be correct for this injector. The question that would remain is how long should the initial pulse be?
It would be interesting to put one of these injectors on a scope and see how long it takes to saturate the coil with a 14V feed. I would think that you want the initial pulse to be slightly less than the time required to saturate the coil (assuming that time is less than 1ms). Once the coil saturates, the current would rise dramatically unless the voltage is dropped (via a 25% PWM), with no increase to the magnetic field to open the injector any faster.
Posted: Tue Sep 12, 2006 4:14 am
by snillet
ftl wrote:MS2/V3. I'm using a 1ms open time and 25% PWM. I don't think I have changed that for 150 miles or so.
Hmmm, could it be that the Delphi spec of
Driver 4/1 P&H
for the TBI700 inectors means Peak & Hold with a 4:1 ratio? That would imply that a 25% PWM would be correct for this injector. The question that would remain is how long should the initial pulse be?
It would be interesting to put one of these injectors on a scope and see how long it takes to saturate the coil with a 14V feed. I would think that you want the initial pulse to be slightly less than the time required to saturate the coil (assuming that time is less than 1ms). Once the coil saturates, the current would rise dramatically unless the voltage is dropped (via a 25% PWM), with no increase to the magnetic field to open the injector any faster.
That is....kind of the point of Peak&Hold ?
Anyone using the GM TBI700 / Holley injector ?
Posted: Tue Sep 12, 2006 4:14 am
by snillet
ftl wrote: Quote: MS2/V3. I'm using a 1ms open time and 25% PWM. I don't think I have changed that for 150 miles or so. Hmmm, could it be that the Delphi spec of Quote: Driver 4/1 P&H for the TBI700 inectors means Peak & Hold with a 4:1 ratio? That would imply that a 25% PWM would be correct for this injector. The question that would remain is how long should the initial pulse be? It would be interesting to put one of these injectors on a scope and see how long it takes to saturate the coil with a 14V feed. I would think that you want the initial pulse to be slightly less than the time required to saturate the coil (assuming that time is less than 1ms). Once the coil saturates, the current would rise dramatically unless the voltage is dropped (via a 25% PWM), with no increase to the magnetic field to open the injector any faster. That is....kind of the point of Peak&Hold ?
Peugeot/Citroen XU5 BDZ(4cyl 1.6litre) engine with 60-2 VR wheel decoding singel coil and dizzy spark and Magneti Marelli(solex) TBI. Msns-E hi-res 0.08f and E85(Ethanol) in the gastank.
Posted by email.
Anyone using the GM TBI700 / Holley injector ?
Posted: Tue Sep 12, 2006 4:14 am
by snillet
ftl wrote: Quote: MS2/V3. I'm using a 1ms open time and 25% PWM. I don't think I have changed that for 150 miles or so. Hmmm, could it be that the Delphi spec of Quote: Driver 4/1 P&H for the TBI700 inectors means Peak & Hold with a 4:1 ratio? That would imply that a 25% PWM would be correct for this injector. The question that would remain is how long should the initial pulse be? It would be interesting to put one of these injectors on a scope and see how long it takes to saturate the coil with a 14V feed. I would think that you want the initial pulse to be slightly less than the time required to saturate the coil (assuming that time is less than 1ms). Once the coil saturates, the current would rise dramatically unless the voltage is dropped (via a 25% PWM), with no increase to the magnetic field to open the injector any faster. That is....kind of the point of Peak&Hold ?
Peugeot/Citroen XU5 BDZ(4cyl 1.6litre) engine with 60-2 VR wheel decoding singel coil and dizzy spark and Magneti Marelli(solex) TBI. Msns-E hi-res 0.08f and E85(Ethanol) in the gastank.
Posted by email.