Well gents, today I'm going to try an old method of EFI tuning that many hardcore racers still use today. If this works I think the 5.0 guys will be trying this the next time out at the track.
For those that don't know or who are simply unfamiliar with the 5.0 setups, there is a spout (plastic plug) in the distributor wiring. (passenger side fender on SN95's). When that spout is plugged in your ECM has full control of timing advance. The problem with letting your computer control this is the fact that the computer pulls out timing.... for emissions and fuel economy and bs like that. Not optimal for racing.
Think about how powerful the car would be if you had full timing from idle. It would probably be hard to control the car and it may not want to go straight, lol.
The next step is to pull the o2's. Why? Because, pulling the O2's puts the computer into open loop fuel mode, the processor does not try to maintain 14.6. It goes to preset values for rpm and load.
After doing these two things the operator has some control over tuning. It is a carburated approach to fuel injection. Now you can adjust timing and fuel pressure manually to get the car where you want it.
The method of madness will be to set a base timing with the SPOUT PULLED OUT. I will set mine to 32* to start out. I'll make a pass and see how the car performs. If it is lean I will bump fuel pressure 2lbs and make another pass. Once it looks good I'll bump timing another 2*. I will repeat this method until the car slows down. At that point I'll retard the timing back 2* and lock it down.
I predict some big changes ahead for the Notch. If by chance I blow a head gasket. New cylinder heads will be in order.
For those that don't know or who are simply unfamiliar with the 5.0 setups, there is a spout (plastic plug) in the distributor wiring. (passenger side fender on SN95's). When that spout is plugged in your ECM has full control of timing advance. The problem with letting your computer control this is the fact that the computer pulls out timing.... for emissions and fuel economy and bs like that. Not optimal for racing.
Think about how powerful the car would be if you had full timing from idle. It would probably be hard to control the car and it may not want to go straight, lol.
The next step is to pull the o2's. Why? Because, pulling the O2's puts the computer into open loop fuel mode, the processor does not try to maintain 14.6. It goes to preset values for rpm and load.
After doing these two things the operator has some control over tuning. It is a carburated approach to fuel injection. Now you can adjust timing and fuel pressure manually to get the car where you want it.
The method of madness will be to set a base timing with the SPOUT PULLED OUT. I will set mine to 32* to start out. I'll make a pass and see how the car performs. If it is lean I will bump fuel pressure 2lbs and make another pass. Once it looks good I'll bump timing another 2*. I will repeat this method until the car slows down. At that point I'll retard the timing back 2* and lock it down.
I predict some big changes ahead for the Notch. If by chance I blow a head gasket. New cylinder heads will be in order.
