fuel pressure is 49 psi, stock injector is 22#, fuel regulator is on the rail with no vacuum port. there isn't a vacuum port on any part of the fuel rail. Made testing the fuel pressure a pain cause I had to take it to a shop that could.
question. Because my turbo does not have an intercooler. Is it throwing off my IAT sensor making it run lean cause its getting hot air right from the turbo into the manifold. Just thought of this this morning. Maybe i'm off.
I spoke to a dyno tuning shop today about my jeep. Told him what I was doing and what was going on. I told him I was thinking about the split second ftc1 piggyback and he was pretty hesitant cause he has had bad experiences with one but he was running 32 lbs of boost on a v8. He said it might work with my setup and told me to get it and he can help me tune it. 300 bucks for the tune with dyno pulls. could get you guys some numbers. What do you guys think?
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rough calculation here considering that the stock injectors are 22lb/hr at 49psi - like i said before you are roughly getting about 40% more air at 6psi of boost (all this at sea level) so you should have roughly 30.8lb/hr injectors - that is at the resulting fuel pressure which is the differential between the fuel rail and the intake manifold pressure since you have no vac/boost port on the fuel regulator (49psi-6psi=43psi) - but also consider that you are in boost so you want to be on the rich side and not like the stock afr which is for normally aspirated engines not to mention the fact that you don't have an intercooler (hotter air) - so i'd say another 10% would be a safe bet - 32 to 34 lb/hr at 43.5psi fuel pressure would probably work. All that is at WOT but most likely you'll have problems with the intermediate stages since you're not recalibrating the MAP sensor. With your injectors if they are 27lb/hr at 43.5psi my guess is that your engine runs at it's best starting around 2 psi up to about 4 after which you're lean, before that you're probably rich.
I don't think the Split second on it's own will do, my guess is that you will need also larger injectors but you could start with the piggyback first and see what the dyno shop tells you.
i can't remember where i read this but one of the companies that was making a mechanical centrifugal supercharger for Jeeps was recommending moving the IAT sensor ahead of the compressor, but in that case you might get pinging unless you go really rich and maybe have an intercooler installed. st.chevrolet (Sean) ended up with a methanol/water injection for chemical intercooling.
