1991 SC AOD 4.2..2.3 Whipple..........10.92 @ 126.70
2016 SRT Challenger Hellcat...............707HP/650TQ
Are you sure it was the lines and not the pump?I can tell you that on my motor, the 255lph high pressure pump and stock fuel lines are not enough for 80lb/hr injectors and E85. (I was at over 120% duty cycle due to lack of fuel pressure) Others may not see such an issue.
I wonder how you would have faired with an Aeromotive 340lph pump and stock lines? I know a proper tune on E85 is fuel hungry. My experience is not with SC's yet, but with GM 3.8L supercharged motors (GTP, Regal GS, etc). It requires about 30-35% more fuel at the same AFR as gas. But to make the best power, you need to be around .78 lambda (low 11's on a gasoline calibrated wideband), which eats up even more fuel. On a low boost or well intercooled setup you can go leaner, but on a high boost or non/under-intercooled setup, you gotta run it fat to see the biggest gains. Either way it won't knock, due to the octane, but leaner isn't necesssarily more power like gasoline. After all, the fuel is acting as your intercooler. I'm going to experiment with E100 on my GTP this year. Should be fun!
Last edited by 92bird; 02-23-2012 at 01:59 PM.
Neither the pump nor the fuel lines were sufficient. I data log fuel pressure and with logged 12 v to the fuel pump (directly powered by the battery through a relay) , 19psi of manifold pressure at 5300 rpm (nearly 1000 rpm below my comfortable rpm point). In theory, that should give me 39+19 psi or 58psi at the rail for fuel pressure. What I actually saw was more like 36psi of fuel pressure at the rail. I verified the fuel pressure regulator was operating properly. (AFR got as high as 13.1"gas" though target was 11.2)
I will be cutting my old lines open when I replace them to look for any signs of problems that might explain the issues I had. Though in general I believe for my application, i need larger fuel lines. Work for the spring.
The track opens up here in the next couple of weeks. I can't wait to see what this thing can do.
Keep us updated bro. Excited to see your results.
That thing must be a tire fryer on the street!
By my calculations, running at 30% OD on the MPX, it is going to fall on its face at around 4200 rpm and become a huge heat pump and not move anymore air, and thats on a motor that can actually breath.
The rpm you saw the fall off at is to be expected because of the blower inlet plenum and the amount of back pressure the blower itself will be seeing right at the top, which would be in the neighbour hood of around 25psi or more with temperatures of 400+F, simply because the motor itself can't take the air the blower is putting out.
I don't think your car would do very well at the track because of traction issues with that much power down low, and the car falling over on its face because of heat etc.
Nice numbers though .
Good numbers for an unopened engine. Have you had it back to the track yet?
This is pretty impressive congrats ! been following this for a while e85 sounds like fun ur set up is very close to mine except I got 60lb injectors wonder if I could go into the e85 land in the future myself