Da P-Funk!

Could we re-clock our crank position sensor to gain a little advance on the timing?

Well?
Huh?

Rusty

I'm wait'n for someone to answer this too. No telling what the computer would think about it. I'm guessing that any timing shift that would actually benefit would have to be done with the software.

Sorry, I try never to post non-answers, but it's an interesting question. I hope someone that does know will answer.

dgilson

i dont belive so because on electronic ignition systems the ignition control module tied into the comouter is what controls the firing order and spark timing and advance. So i would have to say no, u would have to tell the computer to advance or retard the timing, if u just move the sensor then the computer would sense somthing wrong then try to correct it thus making more problems

Da P-Funk!

THE THEORY is that the computer (Hal! Open the hatch!) 'knows what the timing is' based on Crank Position Sensor' (CPS) and adjusts from this. If the CPS was re-clocked and started out a wee bit more advanced - it would 'shift' the whole timing advance curve...

I understand that i would also have to reset the computer before starting it in the new position.

"Always looking for that bit of HP for nuthin'! "

Rusty

Just guessing about what may really happen, but here's what I do know...
If the timing is advanced at times when it's not supposed to be (like at idle and low rpm), the combustion temperature will be too hot and may scorch the piston, valves, cylinder and cause mucho stress on the rings. If the computer erroneously riches it up, that would wash the cylinder walls and increase combustion blowby, dirtying the oil and ruining the ring-seats. You might have a fucked up engine in short order.

alex_aha

are you sure about that Rusty? I dont know about getting time advanced but i have always known that on my bike if i retard the time i can get slightly better torque but roughter idles and hard starts but it wouldnt mess up the engine....

Rusty

Well I used to mess with the timing all the time on my old Chevy V-8s, but none of them were computer controlled and the fuel mixture was fixed. Like you said, you can tweak the timing to get just what you need at whatever rpm range you're interested in, but I'm thinking with a computer involved, more than the timing comes into play. Since the computer adjusts fuel mixture, I'm just raising a caution flag, because I really don't know how the software will react when the altered timing changes the combustion and exhaust temperature, and misinterprets engine condidions. And you really wouldn't want to run it every day with the wrong mixture.

So to answer your question, no I'm not really sure, just cautious.

In my old Chevelle SS 396, if I retarded a couple of degrees, I could really launch it and get a quick 60 foot and 8th mile time, but then it would fall on its face in the quarter. It was great for racing city blocks though!

P.S. Edited this in, forgot to ask, Is your bike computer controlled?