I'm not saying the cam is the limiting factor, it's the rest of my combo thats my limiting factor, I have crappy heads. They are 416's with 1.94 valves, the 58 cc combustion chambers bump my compression up to 9.6 with the stock dished pistons that are in it now. My cam with vortecs would make 375-400 easy.
It's not dyno proven per say, just track proven. I'v run a 13.92 @ 98 mph with the combo I have now. Factor in the heavty weight of my vehicle and you get about 265 to 270 at the wheels, which is ball park 300 at the crank. I'm runnin 3.23 gears and I can get 23 mpg on the highway if I drive at a sensible 5 over the limit, but that rarely happens. On my 100 mile daily commute I run 80 mph on the highway and about 20 of those miles are city miles. Driving like that I average 19.5 to 20 pretty consistantly. Thats not taking it easy on it either, that average usually includes a couple of 0 to 60 sprints and at least one highway squirmish with the local **** population.
This is where I see the biggest difference between carb and TBI. I had a 750 carter on it for years, and if you go in it just a couple of times your milage for that tank was shot, I only averged 17 to 18 being easy on it.
Here are the things I had the most trouble with while tuning my combo. Keep in mind I was tuning all of this with a swap to TBI with no baseline or prior experience.
1: I was trusting the narrow band too much, If I had a WB when I started I would have been miles ahead by now.
2: At idle my NB is pretty much useless with the 747 I have. My idle needs to be richer than 14.7 using the O2 offset isn't an option on the 747 since it only leans out the mix, the 746 I believe has a way to richen it. I got around this by just running open loop. I also disabled Asynch injector fireing at low engine speeds. This did wounders for my idle. I was going in between Asynch and synch at idle, and it woudl hickup every time it did sometimes 2 or 3 times a second.
3: Getting enough AE or pump shot is tricky with this motor, the 454 TBI combined with the peaky mid range requires alot of fuel when you smack open the throttle. I'm still working on getting this perfected. It's already 10 times better than the carb, but my WB showes me room for improvement. Disabling Asynch at low engine speeds also helped my AE by leaving more room to get the pump shot in. AE is injected asynch, and you run out of time to get all the needed fuel in.
4: Tuning around big injectors requires more than just adjusting your BPW constant. Everything that is fuel related needs a little tweaking.
