Changing alternators...will there be a difference?

[bigash]

Hi, I have a van that probably goes against the grain on this site.

I have recently installed electric steering and I have a rather large stereo system. Due to these mods I am changing my alternator from 65A to 150A.

Will the larger alternator have an effect on fuel economy?

[euromodder]

All the power it provides comes from the fuel you burn.
If you draw more power, it'll use a bit more fuel - an internal combustion engine is not a very efficient generator.

Did you see any benefit from the electric power steering ?

[bigash]

Im still waiting for some hefty wire to be delivered. Im also waiting for some ARP head studs as Ive just done my head gasket and installed a better flowing turbo and inlet manifold. I ran it with standard head bolts and lifted the head off the block...too much boost! Apparently these head studs do save fuel. I personally don't see how but so many people have them and swear they do. I want power from my van when I want it but mostly economy as i cruise off boost most of the time.
It will be a job to tell what MPG it is doing now as I have also messed about with the speedo and the needle isnt quite in the same place as it was. I think I will have to install a cigarette lighter socket and run sat nav from now on so I can monitor it properly.

My van didnt have power steering to start with so I'm not doing this for economy btw...its just too heavy on the steering for me TBH

[drmiller100]

It won't change your mileage.

it will recharge your battery a bit quicker when you start your car or use power steering, but that is about it.