Tune Help

[Cbaranski]

BTR Truck Norris cam, stock replacement lifters, TSP roller rockers 1.75 ratio, TBSS intake with LS3 throttle body, marine 8.1 42lbs injectors. I have an issue with hard starting while hot or warmed up. If i hit the key to start after about 15-25 minutes it'll have a long crank and no start. push the pedal to the floor for a second or two while cranking the engine fires and runs poorly for a few. I've been learning with help but would like to get this dialed in if possible.LQ9-main Revision 3-24-24.hpt

[SiriusC1024]

Injector data for you:
https://forum.hptuners.com/showthrea...l=1#post763657

[Alvin]

Have you verified its holding fuel pressure while cranking?

Not too much fuel pressure after sitting? (happens cause vaporization, I've seen FP gauges wrap around back to the needle stop over this.

[Cbaranski]

Have you verified its holding fuel pressure while cranking?

Not too much fuel pressure after sitting? (happens cause vaporization, I've seen FP gauges wrap around back to the needle stop over this.

I'll check the next time I drive the truck.Did you happen to look at my tune file by chance? Do you see anything I need to change?

[SiriusC1024]

Yeah. The injector data. Offset is a big deal.

What'd you do to main spark?

[Cbaranski]

Yeah. The injector data. Offset is a big deal.

What'd you do to main spark?

Did I not scale the Injector data correctly?

[SiriusC1024]

Your data is different than the file I linked you. IFR, Offset, SPA.

[Cbaranski]

Your data is different than the file I linked you. IFR, Offset, SPA.

I made a change using the injector data you sent.

[SiriusC1024]

No, you didn't do it right. I included EOIT for the TN cam and adjusted >Transient>Min Fuel Mg.

Like this:

[Cbaranski]

No, you didn't do it right. I included EOIT for the TN cam and adjusted >Transient>Min Fuel Mg.

Like this:

Thank you for your help, I really appreciate it. Heres my latest log. If you see anything I need to change let me know.

[SiriusC1024]

Fueling is off 5-10%. This is to be expected since the injector data was changed. Seems like a step backward, but once you redo you'll see the benefit.

How's the starting issue?

[Cbaranski]

Fueling is off 5-10%. This is to be expected since the injector data was changed. Seems like a step backward, but once you redo you'll see the benefit.

How's the starting issue?

Starts much better when hot or warmed up. I'm lost on what changes I might need to make?