US v Euro spec: what's different?

[billjam]

I have an ’85 Euro 930 an ’86 US 930. The Euro car seems much nicer to drive with more power through the whole rev range. Both cars are stock except for disconnected air pumps and B&B mufflers (without cat).
I see on another thread that maybe fuel heads are different, but what else?
If the heads are different, what is the actual difference? Are they interchangeable?

There is one major difference I have noticed - the US car has Jetronic box and some relays under the seat whereas the Euro car has none of this. Is this a difference between Euro and US models or a difference between 1985 and 1986 models?

I’m not out for maximum power (yet!) but if there are simple changes that can be made to get the US car up to same performance, I’d like to look at doing them while I have the engine out of the car.

[NathanUK]

Those electrics are for the CO sensor. It controls the valve in the fuel head.

[billjam]

Thanks Nathan, however looking at my fuel head (= fuel distributor?), I don't have any electrical connections (see pic of US fuel head and airflow sensor) so I'm not sure what you mean there.

Does anyone out there really know what is different between US and Euro spec engines? It must be more than fuel heads!
I see in PET that fuel head and airflow sensors are different part numbers between 930.66 and 930.68 models. What is the actual difference between these parts?

I'd still like to know if the electrical bits on the floor under the seat of my '86 US car are specific to the US spec or are they parts that were new to the 1986 model. (My '85 Euro 930 doesn't have this.)

I'm beginning to think all of you with US cars are jealous of the Euro car owners and those with Euro cars don't want to let the yanks in on the secret!

[DSPTurtle]

I have an '85 Euro 930S. The main differences are the fuel injection and the exhaust. It is not clear from your post if you have changed the exhaust on both or just the Euro??? The US exhaust is a bigtime limiting factor. Also, the CIS injectors are different between models. I am not sure of the specs, but the Euro injectors flow more. Wait till Brian reads this and he will give you all the details (thats who I first read it from) Oh yeah, you might want to change out the lenses to Euro spec for the lights... gotta be worth at least 10 HP

[billjam]

Yeah, I just checked PET ... the US and Euro injectors are different part numbers as well, so there's another "difference" to add to the list.
Both mufflers have been replaced. Euro car with B&B, the US car with something that looks very similar - see pics.
As far as headers go, they look the same on both cars.
To get car licensed in Australia, red US lenses had to be replaced with amber Euro lenses but I thought it felt only like about 8.5HP! Perhaps I should try lower wattage bulbs as well.

[fredmeister]

Disconnect the pesky fan belt and this is good for 10h.p., then the bulbs don't matter anymore.
I think maybe the rotation of the earth is different south of the equator too, so that probably is good for 20h.p. between US and Europe.

[DSPTurtle]

I believe that the headers are different. If you read Andersen's book you will see that he gets rid of the US exhaust in favor of the Euro. I am not exactly sure of the difference... since they are interchangeable that would mean that the port sizes are the same. But, something must be different