Uprev logs are showing a trend for bank 1 to register approx 0.25vdc lower than bank 2.

I'm going to look for leaks on the injen long tubes (just cleaned and reoiled filters) but as far a I look back it's been present (2 years of data logging and street tuning).

Those with uprev: can you see this much difference on the majority of your data logs?

Possibly a dirty maf sensor?

I'm tempted to buy a 3rd sensor and move them around to see if it's part to part variation.

 

I've had this issue too. ..25 on average. Thought maybe i was being **** retentive in my quest to dial this in, but i still have a concern.. Ever have any luck with this?

 

Well I no longer have my uprev setup after being fully dyno tuned on e85.

We figured out the problem while on the dyno:

My oil cooler is located on the driver side approx 3" in front of the air filter .

Engine was sucking hot air and pulling timing. A piece of cardboard to block the hot air flow instantly brought timing back up.

Next time I clean the air filter's I'll fab up an aluminum duct to get the hot air around the filter.