Hey,

Is it possible to take the ECU from a 136i and place it into a 135i engine?

i.e. i bought a 57bhp car and it would give me 68bhp ??????

No it isn't AFAIK. The size of the ECU's is different (135 is bigger) and the thing that gives increased BHP is the shape of the pistons. If you need a spare 135 ECU I have one I may be willing to let go of if you need one and it's fried, as I assume it's no good for my car (136).

I assume it's no good for my car (136).

I think you could connect it all up to the 136 and have have electronic ignition? Would start and run a little better then.

Is the 135 ECU system better than the 136 ECU? It seems to be twice as deep.

Wouldnt have thought so, both are Bosch, just designed for different types of engine. When you said 136 I thought you meant you had the carb version Favorit as thats what they tend to be called.

Sorry for confusion I have found my car starts surprisingly well even with worn plugs with bad gaps, particularly when you go in and out of a shop and come back to the car while still warm when I would say less than a second in the start position on ignition and it's running. You can almost turn the key all the way around then immediately let go.

It's quite peculiar how the 135 ECU is much bigger than the 136 ECU. I wonder if the 135 ECU was made cheaper, uses older technology, or if the difference is to stop people swapping them over assuming they're the same bit.

The early 135 engines that were used in some rare export models of the Estelle and the Rapid RIC used Renix injection which was roughly the same as the system used on the Renault 5. Maybe there is some relation there because the ECUs on those things were massive.

The 135 engine has lower compression than the 136 due to having concave pistons rather than flat topped pistons.

The Rapid 136 had a carburettor and no catalytic converter.

The Rapid RiC used the lower compression 135 engine, had Bendix single point fuel injection and a catalytic converter.

The Mk1 carburettor Favorit had a 136 engine, later Mk1's had the 135 engine.

Mark 2 Favorit's at first had the 135 engine with single point Bosch fuel injection and catalytic converter. It produced 54 bhp. In 1994 Skoda re-introduced the 136 engine as an option for the Favorit, again with Bosch single point fuel injection with catalytic converter. It produced 67 bhp. These Favorits can be recocgnised by the letter E after the trim level badge, ie LXiE, or GLXiE instead of LXi or GLXi.

The ECU for the Favorit 135i and 136iE engines are not interchangeable, and the Rapid ECU is totally different.

:)So there!

...Yep Dave, that just about nails it on the head.

I had the official Skoda workshop manual that covered the RIC Rapid as I had one in burgendy red, looked exactly like your Rapid on the outside but with the twin lamp grill.

My Favorit is the "E" engine. I know the 135s have the lower comp pistons, which bring it down to something like 8-7-1 compression.

I heard about someone supercharging one a while back and running it on megasquirt.

P.S. Whats going on with the ownersclub forum at the moment? Cant login?