Anyone try to bypass/remove the idle speed control valve and use the adjustments on the secondary throttle valve for idle speed control? I'm working on it now just wondering if anyone else has tried.
Why do you want to remove it, what's the benefit ?? on the K7 models the ecu controls the idle.
When you remove the ISC valve you get a malfunction code. You can not use the secundairy plates to controll the idle because they are controlled by the ecu, maybe with the lower throttle plates. When i run my bike (K3 (other throttle bodies as a K7))with the airbox off you can see that the secundairy throttle plates are not fully closed and you can see that the ecu adjust them.
But i can not see how you want to get it running properly, i think that the ISV valve also raise the idle on a K7 when the bike is cold.
??Well I'm planning on removing the secondary throttle actuator and replace it with an adjustable vacuum diaphragm to control the mixture instead. That will put more emphasis on properly tuning the PC3 because the stva will thus have a smaller range it can adjust in, plus it will auto compensate for different atmospheric pressures.
I'm with our friend from across the pond. I don't see how replacing the stva with a vacuum actuator is going to help things. I would love to be proven wrong though.??
You want a vacuum diaphragm that controlls the secundaire throttle ??
I don't see how a vacuum adjuster is better than a electrical. Vacuum adjusting is slower and you can not controle it properly.
And when you remove the secondary throttle actuator you get al kind off problems --> FI light, no raised idle when cold, and maybe other problems.
Slower is not good, i want a fast throtlle respons it's a motorcycle and not a slow moped. The throttle sensitivity you can not change, lots off engine breaking, it's a VtwinI only like the vacuum modulator because it is adjustable and the stva is not. And as for it being slower, slower is a good thing, much of the sv's throttle sensitivity is directly related to the actuation speed of the stva.
The numbers on the PCIII are not random.And as for the pc3 options, i have only seen injector mapping and throttle pos, feedback. And the numbers for the injector map just seem to be some random set of numbers that seem to have no visible correlation to injector pulse width or duty cycle.
You can change the throttle sensitivity, by controlling how quickly the cv system will allow the engine to build power. If the secondary butterflies are slower to open, then the engine hesitates a little more switching from idle to cruise/WOTSlower is not good, i want a fast throtlle respons it's a motorcycle and not a slow moped. The throttle sensitivity you can not change, lots off engine breaking, it's a Vtwin
I know they're not totally random numbers, but they are different on every bike, they just mean % of change from stock fuel map. I mean whats the duty cycle and inj. pulse width for cyl 1 at 25% throttle and 2500 rpm.The numbers on the PCIII are not random.
The numbers are the fuel setting (zero is the basic standard map).
When you raise the numbers you get more fuel (rich) and when you lower the numbers below zero you make it more lean.
Anyone on this board had to replace these? Anyone? Randy with his 100000 mile SV?On another note the electronics on SDTV FI are very expensive and degrade over time. When it comes time to replace all those nice little servos and sensors, you are looking at spending some $$$$$
The PCIII screen will tell you the duty cycle, which it'll also log, if it interests you. But the reality is that the exact duty cycle isn't actually important... if you need more gas, you add it, if you need less, you take it away.I know they're not totally random numbers, but they are different on every bike, they just mean % of change from stock fuel map. I mean whats the duty cycle and inj. pulse width for cyl 1 at 25% throttle and 2500 rpm.
You'll gain no advantage by having that level of injector adjustment... a change that small wouldn't be measurable even on the nicest dyno.it would be kinda nice for more advanced users to be able to view more raw data feedback from the engine's sensors, gives you the ability to make finer adjustments to the tuning(down to 0.0001 volts on injector pulse and sensor feedback).
That'd be one option, but you'd have a hard time finding justification for it.