Originally Posted by MMGT1
Have you run with those yet? If not, you are about to see your 12's man. If you got a 13.0 out of it before, I would hazzard to guess a 12.6-12.7 is in your future!
Sorry to say, already had two sessions with those; best 60 foot was 1.874, but I hope to squeeze a few more thousandths out of 'em.
But the big problem is, the car ran out of fuel in some of the last runs at the track. The 28lb injectors could have been at fault, but it could also have been the fuel pump canister running dry. I had the FPR set up to 62 psi to help the injector situation. Injector duty cycle hit 105%, but in the past I was able to maintain AFR at that point. Then again, the injectors might have cut flow because
of the higher pressure. The failure actually occured at a lower duty cycle.
Here is a scan graph of the last run back in November:
Due to the graphic nature of this graph, those sensitive to things graphic should NOT LOOK
In chart #4, you can see the O2 reading gradually begin to decrease, then suddenly drop like a stone. Soon after, chart #3 shows the sudden rise in KR, and the Table logs the misfires at that point. At the very end, the misfires produced a few backfires also, and the IAT sensor reading instantly rose 25 degrees. That sensor is located in the upper intake, on the side near cylinder#1. ( normally I don't get that much KR in 1st and 2nd gear, but I set it up a few degrees more than usual for those last runs. Net timing was about the same)
Now, in order to maintain good atomization and minimize misfiring on cyl #1 with the RC injectors, I will need to have the engine warmed up hotter than in the past, which can hurt E.Ts. And to make sure the fuel canister doesn't run dry, I will have to have at least 3/4 tank full of gas, which adds some weight.
Add to this, I am still running a stock tranny.
Not that I'm complaining
*whole story on those sessions is here: