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fly by wire throttle
DIY Si - 10/6/08 at 09:21 PM

I think this is in the right place, rather than the EFI bit. My donor Alfa runs an ecu controlled/fly by wire throttle. This shouldn't be a problem as I have just spent all evening getting the pedal pot out. However, can anyone foresee it causing problems in a kit car? I planning on upgrading to ITBs in the future, so it won't be there forever, as I'll use a normal cable then. But it will be like running fly by wire for the SVA and first few months on the road. Has any one got any advice or thoughts about this? I'd rather not upgrade just yet, as I'm trying to spread the costs out a bit!

britishtrident - 10/6/08 at 09:23 PM

Don't ya just love a guy willing to step into the unknown. :-)

[Edited on 10/6/08 by britishtrident]

DIY Si - 10/6/08 at 09:30 PM

No one ever said you had to know what you where doing to build a whole car from unknown parts! Besides even I grew up with A series engine and SU carbs. EFI is still a learning curve for me!

tegwin - 10/6/08 at 09:37 PM

IMHO....I would be tempted to fit a cable and be done...


Fly by wire is a real pain expecially if your throttle body falls out of callibation with the peddle...

Most FBW cars have a built in lag in the throttle so you cant snap the throttle open.....not ideal in a kit car

DIY Si - 10/6/08 at 09:41 PM

But how would I do that though? Would the ecu know what the throttle's doing without it?

britishtrident - 11/6/08 at 07:34 AM

quote:
Originally posted by DIY Si
No one ever said you had to know what you where doing to build a whole car from unknown parts! Besides even I grew up with A series engine and SU carbs. EFI is still a learning curve for me!


Hell A series engines are still a mystery to me.

britishtrident - 11/6/08 at 07:37 AM

quote:
Originally posted by tegwin
IMHO....I would be tempted to fit a cable and be done...


Fly by wire is a real pain expecially if your throttle body falls out of callibation with the peddle...

Most FBW cars have a built in lag in the throttle so you cant snap the throttle open.....not ideal in a kit car



Throttle pedals getting out of synch brings back memories of the "Dunlop Pneumatic Throttle" in the very first Hillman Imps ---

MikeRJ - 11/6/08 at 07:47 AM

quote:
Originally posted by DIY Si
But how would I do that though? Would the ecu know what the throttle's doing without it?


No, you'd probably have to ditch the entire ECU system and start from scratch.

There is no reason this system wouldn't work on your car as long as you are careful with the wiring. I presume you are going to use the entire donor engine loom, so this shouldn't be a problem.

AlphaX - 11/6/08 at 08:26 AM

shouldnt be a problem. Some people do it with the aud engine/ecu as well. Figure out what position is the 0% and what is the 100% and make it to that, ie mount it a bit higher or lower on your pedal. You should be able to get a read out what is 100% from the resistance its giving back to the ecu or the voltage. 100% can be either 5V or 12V.