So I'm tuning my rcsb gmc. It has an lq4 6.0 in it with 224-112 cam, 243 heads, volant cai, 160* thermo and lt's no cats. When I try to tune the ve with my wideband, I see no change. Its constantly running 15.1-15.5 at 60mph cruise. So I add a lil more to the cruise cells of the ve table, but it doesn't really help. If I turn closed loop off with the vcm scanner tools, I can dial it in almost perfect with the eq ratio table in open loop. So why can't I dial it in with the ve table/closed loop?

 

Your MAF is determining your AFR. You need to adjust your MAF with your trims disabled. A lot of tuners don't even touch the VE table.

 

did you fail the maf?

 

Yes, I set the maf fail frequency to 0 and took the maf off the chart in my scanner.

 

I've been thinking about goin back to the stock thermostat to see if that affects it at all.

 

How is the response? If it runs well and no ping I would leave it; I can't make mine cruise above 14.3~14.4...

 

So set both trim enables to 284* or something, then tune the ve and maf?

 

What are you using to tune? EFI Live has nice tuning tutorials that walk you through it.

 

I'm using HPTuners.

 

Post up your tune so we can have a look.