Slowhawk

iTrader: (11)

Well,did you check the tune up here? What alot of tuners don't relieze is that our gas sucks and about 80% of the mail order tunes I see have alot of KR. 42lb injectors are marginal up here with DA's in the negative 3/4 of the year. My 60's use 75% of the cycle at 7lbs. So,I wouldn't jump out there and up the boost just yet till you fully check to make sure the truck likes the tune up here and the injector cycle. Alot of people blow there motor's this time of year.

P.S, I'm not saying anything about Allens tuning or anybody's,it's just safe to check to make sure the well known crap winter gas we get isn't going to pop the motor.

dan96z71

so in order to check for KR do I need to get HP Tuner or EFI Live? I have a PLX wideband in there right now.

hotrod04

iTrader: (1)

With 43lb. injectors and 6lbs of boost I was at 100% duty cycle so I went with 60's and now they are at 68% duty cycle. When I had mine dyno tuned we ended up at 12.5 af/r and no kr. Picked up 30hp going from 11.5 to 12.5. I don't think 42's will cut it at 10lbs. of boost.

dan96z71

You also had a 6.0, I only have the 5.3 so that might make the 42's still ok for 10 lbs

stock48

iTrader: (16)

I have run 15psi up hear at 7000', at 70% duity cycle on 60LBer's shifting at 5800RPM no meth. The AFR is getting up around 12.2. Im getting KR but also get the same KR @ 6psi with a 9.5 AFR. I cannot det at all. Do you get into detination without the meth, or are you running out of injector?

stock48

iTrader: (16)

Id try 8psi first.

dan96z71

yeah, get it to 11.2 or so on the wideband at 8 lbs and that might do it.

stock48

iTrader: (16)

It will probley go 11.2 -11.5. You might not be maxing out your masf yet, so it may stay where you are. There was a small shim that came with my waste gate. I tried that gave me another 1.5psi. It was a notaceable difference.

dan96z71

Nothing else that I remember in the wastegate box. Where do you get the other springs?

WJ MARK

iTrader: (7)

Rick has the springs, or can get them. Im running 10 psi up here with 42lb.ers and inline 255 boost pump. My A/F is around 10.9 also, which I like to keep it there. The gains from leaning it out won't be as much as bumping up the boost and keeping it rich and more safe. I think my duty cycle was 90%. The diff rom 6-10 psi was huge!!!!. I may have been running more like 7psi, but anyways I dropped 1.5 sec. off my 1/4 mile time. Im still running 10psi, and probably will keep it there for a while. But as mentioned before depending where you are will determne how much fuel you need. At my altitude alot less fuel is required than at sea level.

Go get yourself a boost controller and start slowly bumping up the boost. I think you will be safer having a rich tune and upping the boost , than leaning it out and burning up the motor.