Ok so can someone tell me if this makes sense??? I have a tbi running 61lbs injectors at 19psi and im using a bpw of 116. Is it possible that they would go static at 5000 rpm??? Im not running any more than 85% Ve total at any Rpm or map range. By bigponds calculator that would mean that Im making over 280hp! Is there a way to check inj duty cycle with a 7747 $42 and winaldl?? If so could someone give me a run down on how to do it?? Im sure that this engine was dynoed at 295-300hp with a carb and long tube headers but Im still not sure about the dyno operator, its seems to be to mild a mill for that kinda power. It a stock 1980 low compression bottom end 4bolt main with old reworked fulie 461 heads a comp XE256 cam/ Airgap rpm intake and shorty headers with msd coil and wires. I just cant seem to get to pull past 5000rpm with a tbi unit. It pulled past 5500 with a 650 carb. Any help please!!

 

Your BPC should be 107 now, not 116.

Here is my experience with Static injectors. It was back when I had my 305 running TBI. I had 55# 305 injectors running at 16 PSI, a BPC of 115, and NO VE cell higher than 85%. At 4,600 rpm the engine would start to buck, at 4,900 rpm it would lay over, start missing terribly, and have a gurgling, BWAAAAAHHHHH sound to it, sometimes it would backfire. After messing with it for a while, I determined it was fuel. I slapped a set of 68# 350 injectors in it, set the BPC to 93. I went WOT again with it. The engine suddenly gained over 1,500 rpm. The 1-2 shift would pull clean up to 6,000+ RPM. 2nd gear would pull over 5,500 rpm.

 

That makes alot off sense to me too!!! But how did you come up with that BPW calculation??? And Im quite sure that if I reduce my bpw to 107 I will end up will A ve curve well over 85%. I guess that I need to do some more tuning and figure out what its going to take to get to my max rpm. My ve cells are all within +- 2 under wot that is so I would like to beable to leave that and just add some fuel or change the bpw to compensate. Thanks again.

 

looks like your 61pph's are 73.7 pph at 19 psi, 278 max HP supported. BPC should be 113. Either way, it's too high right now. Lower it down a bit and see what happens, it's worth a shot.
-the math for my inj/FP combo says I should have a BPC of 87, but I've fudged it before and now I am happy with 85 which is pretty close to what the numbers say it should be.

 

BPC won't un-static-ize the injectors when the engine goes flatline from no fuel. If the VE is just wrong, and the injectors are not static, it would help, but, it's probably just static injectors without enough juice squirting out of them. Raising fuel pressure with no other changes would be the logical test.

 

If you can datalog, you can capture the PW and know for sure when your going static.

 

What happens when the injectors are static for PE as far as how it affects AE in same tune. Does that mean the AE may be static as well assuming it needs more fuel than PE at certain RPM when AE involked?

I thought it was said AE shows more msec than PE in logs at times?

 

If theyre static in PE, then no additional fuel can be delivered for AE. Same thing if they go static in AE. It wont deliver all the fuel that you want. The AE is actually what drove my injector sizing and pressure. Need tons and tons of it when the weather turns cold.

 

Just so that you guys know!! You can call me dumb because I had way to much Ve in the upper rpm range and there for the injectors were going static and causing a lean pop through the intake. I reduced my BPW like was suggested and leaned out my upper ve adder table and bang- it pulls until the cam goes flat. THanks guys!!!

 

Keep in mind that static is static is static. If the injectors go static, then there is no more fuel available, so lowering the VE may have no effect other then just making the lean condition worse. Its possible that it may just have had too much fuel, or there is some other issue at play.