Congrats, great #'s

 

I am running on AEM boost as well. My current cams have a ****ty ramp rate tho. **poke** Aaron@ER

 

wow man gotta say youve got one hell of a beast. Couple things might help your bugs your working out with the car, I know a few people said to upgrade your feed lines, which should help, but imo running id 2000 injectors and a double pumper, wouldnt part of your issue lie in overwhelming your stock fuel pressure regulator?? I say that because i looked at your mods list and didnt see any mention of it. I would assume your running lean because the stock regulator flows in the 38 psi range at idle so even pushing your boost to 40 psi would put the regulator at 70 ish psi, regulating your fuel pressure. And if your running on e85 which requires 30% more volume then gasoline for your proper air fuel, wouldnt that mean your kind of overrunning your regulator thus making it difficult for it to control fuel pressure. Therefore going lean in the higher rpms. Im no expert, but im pretty knowledgable, and if your gonna go so far as to replace your stock lines with an -8 or -10 lines, i think that would be a band aid fix as apose to an adjustable fuel pressure regulator set at say 43-45 psi at idle. Which might give you better fuel control, and simultaneously be able to drop your injector duty cycle % since you dont need to up them to keep the same volume and air fuel throughout the power band. Just my 0.02 someone correct me if im wrong. But all in all anything in our cars over 500 hp is scary fun, cant imagine 780 hp holy $hit haha

 

Thanks, but its already got an Aeromotive a1000 regulator on it.

 

Just curious, but why did you do your dyno pulls in 3rd gear at 1.4xx:1 instead of 4th gear which is closest to 1:1?

 

Its a bit of a shorter pull and a little easier on the engine. Although, I have a 4.11 final drive, so its still lasts longer than it would in a factory geared (4.56) car. Many people dyno cars this way. Then once the fueling and timing is correct and safe, they will do a 4th gear pull or two for the final hp #. BTW, 4th gear pulls almost always show higher hp #s than 3rd gear pulls, FWIW. If the pull I've shown here had been made in 4th gear, it would have shown a number well over 800hp.

 

Not to mention the insanely low reading dyno. I'd be curious what this car would make on a Dynojet.

 

I didn't see this thread until now.

Looking at the dyno graph I don't think the problem is the fuel line like I told you in the PM's. I think the second pump is dead or both aren't flowing well. The car is out of fuel long before the fuel lines will be a problem, you can see the car is rich and then just runs lean all of a sudden.

You have something wrong with the pumps or the switch or something. Are you measuring fuel pressure during the run? Do that. Did you check FP on the 2nd pump by itself? Do that too.

 

Switch is good. I was driving the car on the dyno and could see on my gauge exactly as the second pump kicked on. I also saw about 85psi of fuel pressure. I'm not sure, Dave. You may be right though that the pumps aren't flowing as they should for some reason, but I know they are both at least working. We can check pressure on the second pump, though.

 

Measure fuel pressure at the rail... then check voltage to the pump. It's pretty easy to diagnose.

 

What David said.......same thing happened to me. One or both of the pumps in my BR double pumper went bad and my air/fuels looked identical to yours. David replaced both pumps for me and was good to go (minus burning up the rings in the motor from running lean too much ).

 

I'd put a little wager on being right I think your car is going to be easier to fix than you think. It may just need to fresh modded pumps thrown in it. They get weaker over time and I've seen what's happening to your car before and that is not a sign of the line giving up but a pump, granted if that dyno reads close to mine then the line itself is too small too but I think right now you have a pump issue.

 

I think it reads alittle lower David. (this dyno seems to be kind of broken or way past its service limit.. it needs re-calibrated i guess)



This went 138mph with 3200lb car with driver.


on another note - i just had a hobb switch failure on a customers car.
we couldnt figure it out.. car kept goin lean then all the sudden it went
super rich and i was like wtf?

so we diagnosed it swapped hobb switch and all was well again.

thats the first time i seen that fail in a evo. i been running my br dp for like 2yrs now.

i know thats not whats happening to this car tho lol.

 

pull the lines off, jump the fuel pump relays, and test each one individually.

my car isn't anywhere near your power, but i am right at the cusp of maxing out 1680cc inj on twin 255's on e85.

all the sudden my car was leaner than usual one day. did some troubleshooting, and tested each pump, and 1 of my pumps was flowing about 70% of what the other was.


on that note, your car is bada**.

 

Fresh modded pumps, fuel rail (not sure if you have one and don't feel like looking), and a -6 feed line is more than enough fuel for this. Stock fuel line becomes a HUGE restriction.