Will 42lb injectors be enough for a solid roller 383 and should I upgrade the fuel pump, more than the 255 I have, since I'm also going to be spraying? What injectors/pump if so?
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Will 42lb injectors be enough for a solid roller 383 and should I upgrade the fuel pump, more than the 255 I have, since I'm also going to be spraying? What injectors/pump if so?
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The published stoichiometric ratio for E85 is 9.7:1. Just comparing that number to gasoline (14.7:1) indicates you need at least 52% greater volume of fuel when running E85. To make max power, the ratio for E85 can be as low as 7:1, effectively doubling the amount of fuel required. So your 42's and current fuel pump aren't going to be big enough.
As far as running nitrous, it only affects the injector size if you are running the extra fuel for the nitrous through the injectors = a "dry" system. If you run the fuel through a port system or a nozzle or plate system = a "wet" system, the injectors are not affected.
Thanks for the info. I do understand the difference in dry and wet kits. That is why I asked about the pump. I don't want to run out of fuel while spraying. I'll be using a nitrous outlet plate kit. So by that percentage increase I would need at least 64lb injectors? I want to keep my max duty cycle under 95% at wot and my fuel pump under 90% on spray. What in tank pump would be the best for the stock return style system?
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No. the 50% increase is what you will need for "normal" part throttle driving, with the PCM in closed loop. When you go WOT, you have to richen the mixture a lot more. That's where the "double" (add 100%) comes in. The exact size of the injectors will depend on the headroom you have now with the 42's (typically, they will comfortably support 600 flywheel HP). But I would think you would be looking at something closer to 72 #/HR.
Also would not run 95% DC on the injectors. They can get squirrly at 85-90%. I haven't looked at some of the newer designs, maybe they are more forgiving.
My numbers are based on calculations. I would wait for someone with actual E85 experience to jump in. The 7:1 for max power is the richest that I have seen referenced, but I have seen people quoting 8.5 - 8.0:1.
With the nitrous, depends still on how you supply the fuel to the plate. Some people opt for a separate fuel cell and pump to supply the plate. I would also like to hear from someone who has used nitrous with E85. Nitrous already has a very low stoichiometric A/F ratio with gasoline. Using E85 is going to need a big volume compared to gasoline, with the nitrous. Just for reference, at 500 HP on straight motor, I run a 205 LPH pump. To add the 300 dry shot, I have a second 205 LPH pump that comes on with the nitrous arming switch. And I run 74 #/HR injectors. DC with nitrous runs between 70-75%. Lines are still -6AN supply and return, although the rails are run in parallel rather than series to minimize the pressure variation between the first and last nozzle. And I run the rails at 58 psi. I would think a similar approach would be essential with E85, since you will be trying to push up to twice as much fuel through the rails.
In addition to the pump, you will need larger fuel lines. And of course every component in the system has to be checked for compatibility with ethanol.
Hmm. Thank you. I'm guessing for my setup I'd need at least a 405 pump, upgraded lines, 72lb injectors, better rails? My guess is the motor should make about 575 at the crank with another 125-150 from spray. Your setup sounds beefy.
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Stoich for e85 is much richer than needed.
Again jump to a injector website and run the calculations and keep it below 80 duty cycle.
Headroom is ideal especially with e85
This is what you want. They come flow matched from these guys and they are absolutely GREAT to do buisness with. Its what i run on mine
https://secure.fuelinjectorconnectio...-ev1-plug.html
If you have any questions about tuning ask. I can maybe point you in the right direction. Ive been running it for 5 years now.
Thanks man. How much power are you pushing with it?
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Not a lot. Its just a 383 with stock heads, stock intake and small cam.Quote:
Originally Posted by blackbird1084
How much flywheel hp you looking at? Cylinder head choice ?