Running rich on Syvecs

[DonkeyApple]

Been having to use 95 a bit recently and the car has been running very rich. Since being able to get some optimax I think I’ve noticed less of a smell of fuel.

Is it plausible that with 95 not being mapped for the set up that it was sucking more fuel or is this a silly theory and I should press on replacing the lamdas etc?

[DonkeyApple]

gruffalo said:

Sorry can't answer specific to Syvecs but I am going to go for the new MBE because it continually alters mixture and timing settings , I believe the Syvecs is limited in that once it detects a knock it backs the mixture off to a safe setting and locks it there until the ECU is reset. Safe means rich.

I may be wrong in my understanding but I believe this is the main reason the new MBE is used with knock sensing and wide band lambda as the upgrade de jour!

To be honest, I think the only discernible difference between Syvecs and MBE is that the former is not sold by bad mouthing the alternatives by the vendors.