Actually... he'll only be at 82% duty cycle with 4 x 1600cc at 9500 rpm. If he brings it up to 9500 rpm, he should be able to hit 730 hp.

My calculations at 10.5 AFR give 660 hp at 8000 rpm, so he's right on the money. I would say his bridgeport flows slightly more than my calculated flow which is for a large streetport.

Here's the calculated dyno plot according to his set-up.



Injector Pulsewidth
rpm Primary (ms) Secondary (ms)
1000 7.70 0.00
1500 9.20 0.00
2000 10.84 0.00
2500 12.62 0.00
3000 14.56 0.00
3500 8.35 8.35
4000 9.27 9.27
4500 10.20 10.20
5000 11.16 11.16
5500 12.67 12.67
6000 12.27 12.27
6500 12.12 12.12
7000 11.86 11.86
7500 11.61 11.61
8000 11.35 11.35
8500 11.09 11.09
9000 10.83 10.83
9500 10.58 10.58

Duty Cycle (%)
rpm Primary Secondary
1000 6.42 0.00
1500 11.50 0.00
2000 18.06 0.00
2500 26.29 0.00
3000 36.41 0.00
3500 24.35 24.35
4000 30.89 30.89
4500 38.24 38.24
5000 46.50 46.50
5500 58.05 58.05
6000 61.35 61.35
6500 65.67 65.67
7000 69.21 69.21
7500 72.54 72.54
8000 75.66 75.66
8500 78.56 78.56
9000 81.25 81.25
9500 83.72 83.72

 

Oh **** forgot he has E85. So he's actually at 90% at 9500 rpm. Oops.

rpm Pri (ms) Sec (ms)
1000 8.30 0.00
1500 9.92 0.00
2000 11.68 0.00
2500 13.60 0.00
3000 15.70 0.00
3500 9.00 9.00
4000 9.99 9.99
4500 11.00 11.00
5000 12.03 12.03
5500 13.66 13.66
6000 13.23 13.23
6500 13.07 13.07
7000 12.79 12.79
7500 12.52 12.52
8000 12.24 12.24
8500 11.96 11.96
9000 11.68 11.68
9500 11.40 11.40


Duty (%)
rpm Pri Sec
1000 6.92 0.00
1500 12.40 0.00
2000 19.47 0.00
2500 28.34 0.00
3000 39.26 0.00
3500 26.26 26.26
4000 33.31 33.31
4500 41.24 41.24
5000 50.13 50.13
5500 62.60 62.60
6000 66.15 66.15
6500 70.80 70.80
7000 74.63 74.63
7500 78.22 78.22
8000 81.58 81.58
8500 84.71 84.71
9000 87.61 87.61
9500 90.27 90.27

 

^^^^^^ I calculated for E15 instead of E85. You guys are right. 4x1600 is impossible. He hits 80% duty cycle at 5000 rpm.

 

here's a pic of some of the runs he sent me... you can see how lean it was

 

Wow...... That's the leanest AFR I've ever seen on a 600 hp car.

 

I am still seeking input on this question.

Anyone?

Chris

 

Try re-doing the calculations at 12.2 AFR and see if there is enough fuel for 668 HP.

I think he needs enrichen the mixture but we should be very careful calling foul his numbers.
Barry

 

thanks Jared. i apologise for missing the fact that ethanol has 34% BTUs than methanol.

howard coleman

 

Beat me to it, thank you.

 

According the figures for E85's BTU 4 X 1680's should be enough injector for a hair above 650rwhp* ...that's assuming 100% duty cycle, according to the calculations provided by Howard.


So our guy's 670rwhp is entirely possible if he's pushing his injectors to the max. with a little higher line pressure as well... which he was probably doing. His ''regular'' everyday tune would probably be at 22-23psi & 630rwhp to keep it within the injectors regular use safe limits...