Hi guys just a quick question on a ls2 that's in a Holden commodore
The car has a magnacharger mp1900 with 10psi pully and obviously bigger injectors coils exhaust etc, but after changing the pulley I've noticed it's started braking down under boost , would it be a plug issue or is it leaning out
No codes has come up and I would have thought that the exaust sensors wouldn't let it lean out but I'm still unsure

 

Get with your tuner and have him log it? Could be a spark issue?

 

Il do that Im just scared of driving it if it may lean out and do
Damage

 

DON'T beat on it until the fuel curve, psi and /spark tables, plugs ALL can be verified.

 

All boosted apps should ideally, be monitored by an air fuel ratio meter, especially, when you like to change things around, like pulleys, just so you know what's doing what. When you have it, you'll wonder no more, except, why you didn't get it before...AEM 30-4100 is the best i ever used.

 

What CAMSTER said. If I had to take a guess your going lean. Lean on an FI = lots of trouble.