Post by james on Aug 9, 2009 18:31:16 GMT -5
I've been looking around since I saw a couple of the Nelson Racing vids where they had a dual fuel setup with pump gas and ethanol/race gas. For me it is more of a hypothetical since I'm no where near close to doing this, but we can dream right?
Say you're running an EFI v8 street/strip car such as a mustang with a huge turbo or two, lots of boost, and capable of well over 1000 to the wheels. You've got essentially two fuel systems: 1- a mild upgrade to your factory system (Walbro 255, 42lb injectors) which pumps 93 octane and provides enough fuel for the idle and low boost, and the second, a fuel cell, giant pump of your choice, big lines, and whatever size injectors are necessary (120 or 160lb) and you keep it full of E85/E98 so that as you get into boost your high octane fuel system kicks in. Good so far?
1 - As you get into boost, your ethenol injectors start firing but what do you do with the gasoline injectors? Ramp them down as the ethanol injectors come in? Keep them firing at at least some duty cycle? Obviously when they can no longer support the hp level, you need to have the ethanol injectors already firing, but how do you know when to turn down/off the gas injectors?
2- If you reach the upper limits of your ethanol injectors, can you add in your gasoline injectors and make more power? With all 16 pumping at 80% duty cycle, is there a calculation to figure out how much hp they can support? At 80% duty cycle, say 42lb injectors support roughly 400rwhp and 120lb injectors on E85 support roughly 1000rwhp, do all of them at once support 1400rwhp at 80% duty cycle?
3- Would you change anything if running race gas instead of E85/E98?
Say you're running an EFI v8 street/strip car such as a mustang with a huge turbo or two, lots of boost, and capable of well over 1000 to the wheels. You've got essentially two fuel systems: 1- a mild upgrade to your factory system (Walbro 255, 42lb injectors) which pumps 93 octane and provides enough fuel for the idle and low boost, and the second, a fuel cell, giant pump of your choice, big lines, and whatever size injectors are necessary (120 or 160lb) and you keep it full of E85/E98 so that as you get into boost your high octane fuel system kicks in. Good so far?
1 - As you get into boost, your ethenol injectors start firing but what do you do with the gasoline injectors? Ramp them down as the ethanol injectors come in? Keep them firing at at least some duty cycle? Obviously when they can no longer support the hp level, you need to have the ethanol injectors already firing, but how do you know when to turn down/off the gas injectors?
2- If you reach the upper limits of your ethanol injectors, can you add in your gasoline injectors and make more power? With all 16 pumping at 80% duty cycle, is there a calculation to figure out how much hp they can support? At 80% duty cycle, say 42lb injectors support roughly 400rwhp and 120lb injectors on E85 support roughly 1000rwhp, do all of them at once support 1400rwhp at 80% duty cycle?
3- Would you change anything if running race gas instead of E85/E98?