1 - 7 of 33 Posts
Race cars and bikes have a much narrower power band and it is easier to tune an EFI system instantaneously if cost is no concern. Max power under these conditions is about the same.
Bikes like the GSXR1000 and R1 have quite a different power to weight ratio then sports cars and minor drivability glitches become very noticeable, in part also because when leaned over on two wheels traction is much more critical. This is why despite running EFI they use various secondary computer controlled throttle systems that try to emulate the throttle response of carbs. In other words on a bike it is much more critical how the power is put to the ground.
Emissions force everyone into EFI, but it's how you use EFI. Some of the new japanese bikes are owner programmable from the LCD display while Harley purposely integrates EFI with other systems so it can not be diagnosed without proprietary dealer equipment. This is the part people do not realize, they are being set up for the kill.
Bikes like the GSXR1000 and R1 have quite a different power to weight ratio then sports cars and minor drivability glitches become very noticeable, in part also because when leaned over on two wheels traction is much more critical. This is why despite running EFI they use various secondary computer controlled throttle systems that try to emulate the throttle response of carbs. In other words on a bike it is much more critical how the power is put to the ground.
Emissions force everyone into EFI, but it's how you use EFI. Some of the new japanese bikes are owner programmable from the LCD display while Harley purposely integrates EFI with other systems so it can not be diagnosed without proprietary dealer equipment. This is the part people do not realize, they are being set up for the kill.
The HD EFI and carb cams have the same lift and overlap but the intake timing events are offset 4 degrees and consecuently intake lift at TDC is different. The EFI FLT's are also geared lower then the carb bikes. Even so with equal riders the carb bikes will run away from the EFI bikes, stock against stock, not by much, but they will.
Stock carburetor
-02/38 36/04 216 220 257 260 .473 .473 .072 .110
Stock injected
02/34 36/04 216 220 257 260 .473 .473 .087 .110
Stock carburetor
-02/38 36/04 216 220 257 260 .473 .473 .072 .110
Stock injected
02/34 36/04 216 220 257 260 .473 .473 .087 .110
Maybe so, but I doubt it.
We specialize in EFI bikes and get higher numbers then most with them, not in some piece of literature, but on an actual dyno and on the road.
Discussing EFI and discussing EFI for a big twin Harley are two completely different subjects.
You have the built in limitation of engine (and to some extentbike) configuration.
It is very difficult to get clean vacuum signals on a common crankpin 45 degree two cylinder engine with the associated very uneven firing order and where the intake charge has to make sharp 90 degree turns without the possibility of fitting a large volume airbox. Now add that the Delphi system is primarily MAP dependent and you might begin to understand the problem.
Look at the throttle body arrangement on a Ducati where the intake charge and the injector has a direct shot at the intake valve and there is all sorts of room for an airbox between the V and you begin to see the differences.
When you are dealing with a fundamentally old fashioned engine configuration, regardless of how smart you might want to make it, simple might just be the ticket.
Don't get me wrong, I like working with EFI bikes and they make me good money, y'all go and buy one. I still like a carburetor on my personal bike.
We specialize in EFI bikes and get higher numbers then most with them, not in some piece of literature, but on an actual dyno and on the road.
Discussing EFI and discussing EFI for a big twin Harley are two completely different subjects.
You have the built in limitation of engine (and to some extentbike) configuration.
It is very difficult to get clean vacuum signals on a common crankpin 45 degree two cylinder engine with the associated very uneven firing order and where the intake charge has to make sharp 90 degree turns without the possibility of fitting a large volume airbox. Now add that the Delphi system is primarily MAP dependent and you might begin to understand the problem.
Look at the throttle body arrangement on a Ducati where the intake charge and the injector has a direct shot at the intake valve and there is all sorts of room for an airbox between the V and you begin to see the differences.
When you are dealing with a fundamentally old fashioned engine configuration, regardless of how smart you might want to make it, simple might just be the ticket.
Don't get me wrong, I like working with EFI bikes and they make me good money, y'all go and buy one. I still like a carburetor on my personal bike.
Don't recall much about your bike, and don't know of any good wrench in Nebraska.
There are several kits on the market, put together by guys that do heads. On a carb bike you can pretty much build it over the internet, with EFI we can give you all the information but you still need to be able to or know someone that can dial it in.
There are several kits on the market, put together by guys that do heads. On a carb bike you can pretty much build it over the internet, with EFI we can give you all the information but you still need to be able to or know someone that can dial it in.
Sorry to disapoint you, the EFI Road Kings run the same 38A system as the carbureted baggers. Unless they are police bikes.
7A difference is less then .1KW, it really isn't very significant considering EFI bikes have better cams and gear ratios.
Ask around, there still are some good guys that haven't left the dealers yet and most every dealer has one guy that knows what he is doing, they just hardly ever work on bikes from regular walk in customers. They more often then not have to fix the fu(kups from the rest of the crew when the $hit hits the fan.
If you need some info and I have it, no problem if I'm in town.
7A difference is less then .1KW, it really isn't very significant considering EFI bikes have better cams and gear ratios.
Ask around, there still are some good guys that haven't left the dealers yet and most every dealer has one guy that knows what he is doing, they just hardly ever work on bikes from regular walk in customers. They more often then not have to fix the fu(kups from the rest of the crew when the $hit hits the fan.
If you need some info and I have it, no problem if I'm in town.
No, I don't know anything about them, but that's not surprising as they are on the other end of the country.
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