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Author Topic: Injector Sizing - E85  (Read 4603 times)
mighty mouse
"Prom King Mista Nathan Moonen"
Big Block
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Posts: 12781

Location: Decorah, Iowa
I'll be the Judge of that

« on: January 12, 2011, 02:56:26 pm »

I ordered my Holley EFI kit the other day.  I will get some pics up when its here.

I also downloaded all the software already.  Its kinda like that girl you knew in in college - It lets you play around with all it has without buying anything! 

Very cool stuff.

Since I will be running this car on E85 (at least some of the time) I need some REALLY big injectors.

Here is the formula I used to determine injector sizing with E85:

Quote from: injector-rehab.com

What Size injectors when running E85?

This is becoming a very common question. The answer is not as easy as straight forward as I wish it was. I will try to explain a simple calculation to get an idea to guide you in the right direction.

First things first. You will need to determine your base injector size. This is the size that you should be running on gasoline. To find this size, simply use the calculator located here. Now that you have determined your base injector size you will need to determine the difference in size to run E85 Fuel. The way to do this is to do some simple math. You are going to use the multiplying factor of 1.47 to get your size. The 1.47 number represents the difference between the stoiciometric fuel ratio of gasoline and E85. Gasoline is 14.7 and E85 is 10.0

Now that you have the "magical" factor and your base injector size, do the math. I will do one with you just to show an example.

Let's say that in the Injector size selection guide size calculator, you came up with a size of 42lb injector needed to reach your HP goals. Simply take the number 42 and multiply this by 1.47.

42 X 1.47 = 62lb Injector

*Note that this is not THE absolute number, but rather a GUIDE to help you determine the size of the injector. Good luck on your mission to use a renwable fuel!

According to this formula I need roughly 120lbs injectors (assuming 90% duty and figuring in that rise in fuel pressure linear to the rise in boost pressure)


1986 Mustang GT Convertible
Suspension and Differential by Team Z Motorsports
9.5 Deck Forged Stroker Shortblock by FordStrokers
Trick Flow High Ports and Super Vic EFI intake by Duane Busch

I'd rather be a fool who is loyal to his friends than a POS that jumps ship to save face. We were wrong in the end, but nobody can ever call us disloyal. I can live with that.
Small Block
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Location: henderson,nv.

« Reply #1 on: February 05, 2011, 12:47:10 pm »

hey mm, i was reading awhile back on the e85 performance site that you need 30% bigger inj. size, seems these dudes know their shit,maybe look em up? as always just my 2 cents. nick.

like a bat outta hell
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