MG ZR: Cams & Maps

[lolsteve]

Tbh mate, whatever is said about manufacturers claims being optimistic etc, losing 20bhp is a significant amount that would imply a bigger problem. Best way to sort it out would be with a specialist, especially if you're keepimg it long term and want to stay NA. Getting another engine as a donor would be cheaper, but require a lot more work from you/me/anyone else daft enough to get involved and be a bigger risk (possibility of buying a duffer etc). Depends where your priorities lie.

Yea there is something amiss, or possibly a couple of things adding up.
A thought occurred to me today in lectures while day dreaming, would the leaking rocker gasket thing which is leaking oil into the spark plugs be messing up the timing. Since oil doesn't burn as well as petrol(I assume) so the mix of petrol/oil/air is not burning as nicely as it should.
Also forgot that whilst as rstuning they noticed two of the middle rocker cover bolts were not even hand tight which might explain some leakage into the spark plug chambers

no not really, the mems3 is more hot on emissons, compaired to the mems2 system. I know the mems2 system is a better injection system, well injectors are.
also the mems 2 system responses better to breathing and exhaust mods than the later system you have, proberly why some complain about de catting a mems3 car doesn't run well. mine seems to pull really hard, as that's using the rover metro gti Decat system, ( car is on a J plater)

Interesting, would make sense if it's a simpler system that's not being all twisted by nasty emission problems. Are the early injectors more flow or something then? People say the decat thing is about exhaust scavenging ?