91blowthru

going friday to the track. setup is stock long block lq4, ls6 cam, etc. tc78 turbo
80lb injectors, 2 255lph pumps,
speed density, 2 bar map
tuning with hp tuners.

im going to be running vp112 fuel (unless i hear that i shouldnt) and running 14psi wastegate spring pressure.
i normally drive it on 7-10 on pump gas 93 with between 12-14* timing (and unfortunately my a/f has been extremely rich 10.2:1) just installed new wideband and will be datalogging my runs.

can someone give me some conservative figures i should start with for my timing and a/f on vp112?

thanks in advance

Old Geezer

iTrader: (3)

At 14psi, [if it will hold there], is putting you out of MAP sensor resolution. I'd be watching the AFR really close...

91blowthru

as long as it holds 14 it should be okay right? (2 bar will read 14.7psi?)

and what kinda wot timing #s are people using with similar boost and fuel?

MikeyZ

iTrader: (20)

2 bar should read 30 psi at max

Reject

iTrader: (24)

Your MAP sensor is fine.

BLK02WS6

iTrader: (2)

A 2 Bar MAP does not read to 30# of boost...

OP - your MAP sensor is fine for 14#...

I would run 11.7 to 11.8 to start off... as for timing, start low (your pump gas timing should be close on the race gas with increased boost) and bump it up a degree at a time - watching your MPH increments and read the plugs. Would be best to tune it on a load bearing dyno so you could see how the changes effect the whole curve, but it is doable on the track too...

91blowthru

Thank you BLK02WS6,
would it hurt anything to make the first pass where im at now,and just add the boost to 14? timing like you said should be good to start(12-14*) but with it as rich as it is? just to get started and then tune from there, or should i get it commanding the mid 11 afr first?

BLK02WS6

iTrader: (2)

I would lean it out a bit - 10.2 is pretty rich... also, to be safe, drop the timing down to 10-12* - better to start out too low (especially with a stock bottom end)...

91blowthru

having issues with the correct VE tables for stock lq4 6.0 liter.. ive made changes and still not getting the afr i want.(rich still)

MikeyZ

iTrader: (20)

a 2 bar will read to a Max of 30psi... not 30 pounds of boost

MikeyZ

iTrader: (20)

you would need a 3 bar to handle 30 pounds of boost.

91blowthru

i ended up running the stiff spring(14) and only made 12psi, 14* timing and 10.5 afr. truck didnt really hook all day. went 10.86 at 127.96 and a couple 11.1-11.2s at 126-127 spinning bad .