Originally Posted by
James @ M Developments.
You can map for a more lively engine on a weber if you can use it. Just tell it when to spark and when to add fuel.
The YB is not a modern engine by any means, most newer cars have to have more capabilities due to the hardware they run, but bolting a new manifold and turbo onto a YB doesn't make it modern, it came out of the ark.
I mean its waste gates are normally closed, and it injectors into the inlet, show me a modern performance car that does that.
Most modern Turbo cars cruise with the waste gates open to improve economy, engine efficiency goes through the roof with the gates open and fuel economy increases massively, my little 135I will do near on 40 mpg, with an extra litre of engine size and an extra turbo.
I averaged 26mpg out of my twin turbo 135i.....that would be the one with the twin scroll turbos too, ala EFR
I know what you are saying that the YB is old and someone like you can do wonderful things with the Webber.....most off the shelf chips aint all that though imo. My T34 with Ahmed Chip on L8 was rubbish compared to what I have now.
My point to the OP is that I think he will spend a fair bit of money on a bigger turbo and stick with the old fashioned distributor providing his spark (My Metro had that!) and not get what he wants. He was asking for tuning advice and I believe the money is best spent on a loom first, then modern ECU with coil on plug and new injectors before slapping a new (old skool T34 or the like) turbo on his car.
He could end up with a mis firing, T4 lag monster with no low down power and then big headline number if he is not careful.
Horses for Courses and only adding in my experiences. The point about old fashioned was simply debunking the "good enough for an F40" line