Hi I am an Trifecta Dealer in Puerto Rico, Vince and I are working on my friend Hector 2.2 Cobalt with the ZZP STAGE 2 kit plus other goodies, this the list of things we got on the car so far:

• Bullseye s256 turbo
• Liquid/air Intercooler
• All stainless and aluminum tubing
• 304 stainless 2.5" downpipe
• 3" custom catback
• ZZP 304 stainless turbo manifold
• TiAL 38mm wastegate kit
• Blow off valve
• 60# injectors
• Intake tubing and filter
• Spark plugs
• Boost Controller
• zzp valve springs & retainers
• Wiseco Pistons
• Eagle Rods
• Spec 3+ Clutch

Here is the dyno sheet of the car on our second update of the tune @10psi


As you can see we are having problems with the fuel delivery especially on cilinder #1 and the car is running lean on the lower rpm's. Do you think that if we installed a LSJ fuel pump would that solve his problems? Please comment and suggestions are more than appreciated since this is the first turbo 2.2 that I am working on!

 

is that bottom graph boost or air fuel ratio?

 

Air to fuel

 

That dyno was made before he installed the Spec 3+ Clutch and Wiseco piston and eagle rods a couple of days ago but we dont want to push the limits until we figure this out, the car is running strong the only problems we had at the beggining was a rough idle wich is pretty much solved. Now we have cilinder #1 misfire wich we looked at the spark plug and reggaped them and checked the coil but now I think he is not getting enough volume of gasoline to cilinder #1. That's why im asking about the LSJ fuel pump! and see if that would work.

 

Judging by what I see here, you are excessively rich below 3000rpms.

Then you dip a little lean from 3000rpms through 5000rpms with a lean spike @ ~4250rpm. Then you hit a 12:1 AFR from then on out.

There really isn't enough information to tell if you need a new fuel pump or not. The key indicator that you aren't getting enough fuel would be a leaning out toward peak power, since thats where the peak airflow is, followed by a slight richening in the real high rpms as you get past peak power.

I honestly think your fuel pump isn't the problem but a higher flowrate pump never hurts. Thats why I have 3 walbro 255lph's in my Evo.

I think you can fix your AFR problems with tuning.\

As far as a per-cylinder basis...you have no way of fixing that through tuning. You do not have the ability to do individual cylinder trim with the software at hand as far as I know.

What AFR are you targeting?
What RPMs are the misfires occuring at?
How did you determine the values for the injecto roffset vs battery voltage vs MAP....map for the 60lb injectors?