4.8 LS swap into 1988 c4 corvette

[Corvette Chris 39]

I'll be starting on it in the next week or so. Got the engine sitting here along with most of the additional parts.

That?s great an I wish you the best on your build sir

[Corvette Chris 39]

my most recent log 1 st run in driveway (1).hpl
Does anyone have any input thay can share tune2.hpt i have tried to adjust my injectors but i dont think im doing it right. they are from a 6.0 part number for injectors is # 12580681

[Corvette Chris 39]

Im struggling with these injectors. i cant seem to get the flow rate done correctley . Can anyone help me because im lost

[SiriusC1024]

Is your fuel pressure regulator vacuum referenced?

[Corvette Chris 39]

can you explain that ?

[Corvette Chris 39]

my injectors are ls4 injectorspart # 12580681 30 lb/hr @58psi
The tune i have is saying 24.2 lb/hr some how i need to get the flow rate on my tune to be 30 and then then interpolate from 0 kpa to 80 kpa i need to interpolate this an thats where im confused on what to put

[Corvette Chris 39]

Is your fuel pressure regulator vacuum referenced?

my regulator isnt ran off vacuum if thtas what your asking sir

[SiriusC1024]

Here it is.

[Corvette Chris 39]

Here it is.

ive been trying to figure the math out for two weeks . can you explin how you figureded it out please

[SiriusC1024]

I got it from a 2008 LY5 tune (avalance, silverado 1500, etc). The column labels use different units, but it's easy to get it moved over.
https://forum.hptuners.com/showthrea...l=1#post775252

[Corvette Chris 39]

I got it from a 2008 LY5 tune (avalance, silverado 1500, etc). The column labels use different units, but it's easy to get it moved over.
https://forum.hptuners.com/showthrea...l=1#post775252

today i actually drove it down my street an heres my log file . still cant figure out why im not getting my o2 sensors to read an it was like dying out when i tried to throttle the car so i basically coasted an was able to give just a little gas . Also my ltft an stft arent reading either drive on street 2nd trip.hpl

[gametech]

The fuel trims can't work until you fix the oxygen sensor problem.

[Corvette Chris 39]

The fuel trims can't work until you fix the oxygen sensor problem.

what could be the cause of it ? its all brand new

[gtstorey]

Problems on swaps is usually wiring issue. Very common for purchase harnesses to have issues.

[edcmat-l1]

O2s look disconnected.

[Corvette Chris 39]

O2s look disconnected.

One was hit not the other

[edcmat-l1]

One was hit not the other

???

Both of them in your last log were flatlined at 448mv roughly. Both looked identical.

[Corvette Chris 39]

???

Both of them in your last log were flatlined at 448mv roughly. Both looked identical.

ii put new ones on it today an now i cant get the car to even start at all . What do you think made this happen

[Corvette Chris 39]

So when im cranking it over an using vcm scanner , my log isnt showinh spark for some reason. Im so confusesd

[gtstorey]

Post the log.

If it was me though, I would get the wiring diagram for my donor ECM and check every connection, both for where it lands and for proper connection.