Thumpn

First here is my set up
Setup as follows:
6.0 forged bottom end , dish pistons 7:1 comp
6.2 stock truck heads
78/75 turbo
80lb deka injectors
twin 340l intank fuel pumps
2010 zr1 cam 211/230 @ .050 valve lift and .558/.552 lift
LS2 cam sensor in timing cover
Ict billet intake w/102 mm Tb
napa crb219481 3 bar map sensor ( gm 12223861 alt replacement)
wastegate w/14lb spring

Ok no my issue is that I cant figure out why I have to crank up the Main VE table so high to get it to run? I know that my injector data I not set to spec because if i do then it wont run at all the injector data I have right now I got from the manufacture , as far as flow,mpw,dpw, offset and spa. Is there a setting that I am missing that i need to turn off or adjust?
attached is current tune and log.

LSX Power Tuning

iTrader: (4)

What is your fuel pressure set at?

Thumpn

58 psi

LSX Power Tuning

iTrader: (4)

Try this, you need to put normal number back in your VE. At 58 psi those injectors flow more than you had it set for. Also check your map sensor and make sure it reads correctly with the key on engine off.

Thumpn

Ok , map is reading key on engine off it reads 100 kpa
I tried it out ,with the injector setting you sent and my org Ve and all it does is start and then dies , it does not stay running

LSX Power Tuning

iTrader: (4)

What fuel are you running?

Thumpn

92 pump, the only way it runs is if i turn up the VE it runs less on the injector duty % with your info but it still has what seems like a misfire stutter , at random rpm until I get above 3000 rpm and the then it clears up until I am nder boost and it starts to lean out at about 4500 rpm. the funny thing is I never see the stutter on the scan

here is my log and tune with afr err correction done on my last drive w/ smoothing hit twice

Thumpn

The other thing i notice on the log is the stft is active which I thought that was turned off

Thumpn

So what i am seeing is not good, look at my log at time stamp 20:56:21, my injector duty % is off the chart!

LSX Power Tuning

iTrader: (4)

Are you sure your fuel base pressure is 58? Your STFT are adding ALOT of fuel.

Thumpn

Thumpn

LSX Power Tuning

iTrader: (4)

I am assuming thats an electric gauge, we always use a mechanical gauge just to help rule out any variables. When in closed loop your wideband isnt going show the fuel being added, its going to be showing 14.6 at idle and cruise since thats what the fuel trims are correcting your fuel to. If you put it in open loop then the wideband will show you the correct air fuel ratio.

You have something going on mechanically or with your fuel system or different injectors than you think. The numbers in your VE are an instant red flag thats somethings way off.

Thumpn

Sorry I typo'd about the gauge, it a 100psi mechanical plumbed into the regulator port, how do i keep it from going into closed loop?

Why would the wideband not read in closed loop?

LSX Power Tuning

iTrader: (4)

When in closed loop your o2 sensors are always going to be correcting your fuel using fuel trims so when the fuel trims are adding 30% fuel your will wideband will still read 14.6 instead of 20, what it would be if you were in OL. Here is the last tune you posted in OL.

jayyk31

iTrader: (2)

Open loop youll see the actual AFR that is flowing past the wb sensor. Closed loop your WB will show 14.7ish because in closed loop the pcm uses the narrowband o2's to trim the fuel to stoic. Which is 14.7

Thumpn

Hey thank you for the help all the info you gave me is starting to come together, I have made multiple logs and VE changes over the last 24 hrs and I am now able to Give it throttle and get no stumble or stutter from Idle to 5k and up to 5 lbs of boost, I am how ever still fighting the High VE numbers which is causing me to run well over 100% dc on the injectors over 3lbs of boost , which makes me think that I need a Bigger injector or more fuel feed, which makes it hard to belive i need more fuel feed using twin 340lph 90 psi intank pumps on a 1/2 fuel line

G Atsma

If you are running over 100% dc on your injectors, nothing but bigger injectors will really cure that. They can only flow so much.

truckdoug

iTrader: (25)

no way you're out of fuel at 3 psi on pump gas and twin 340s. log your fuel pressure, something is screwy there

LSX Power Tuning

iTrader: (4)

I agree 100%, 80lb injectors and twin 340's on pump gas should handle 600+rwhp. At 3-5 psi its no where near 600+rwhp.