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-   -   E85 Fuel Injector Sizing (https://www.rx7club.com/single-turbo-rx-7s-23/e85-fuel-injector-sizing-1114531/)

Alpine 05-17-17 02:03 AM
E85 Fuel Injector Sizing
 
I'm planning to run a EFR 8374 at 20-25psi boost on a street ported 13b-rew motor, planning to make 500-550whp on E85 gas.
43.5 base fuel pressure
85% duty cycle

Would 6 x ID1300X injector (total 8040cc flow rate) be sufficient for my needs?

RGHTBrainDesign 05-17-17 05:01 AM
Originally Posted by Alpine (Post 12184448)
I'm planning to run a EFR 8374 at 20-25psi boost on a street ported 13b-rew motor, planning to make 500-550whp on E85 gas.
43.5 base fuel pressure
85% duty cycle

Would 6 x ID1300X injector (total 8040cc flow rate) be sufficient for my needs?
Is this a flex fuel vehicle or purely e85? How did you plan on controlling the injectors?

Alpine 05-17-17 09:36 PM
purely E85, Haltech Elite 1500

planning to use a flexfuel sensor just incase the e85 % lower in a batch of fuel

Hoping someone can check my calculation to make sure these are correct, injectors are expensive lol

dguy 05-18-17 08:58 PM
I was under the impression that the only 'true' E85 ID injectors at this point were the 1050x and 1750x.



I have built around the basic rule of thumb that e85 carries 2/3 the BTUs of gasoline, so at minimum increase by at least 1/3. This doesn't factor in the timing you're able to throw at your engine when you convert to e85 so again, rule of thumb.

Either way I think you'd need ~8400CC at around 80% duty cycle so you're very close, just make sure that those 1300s are e85 capable.

RGHTBrainDesign 05-18-17 11:45 PM
Originally Posted by dguy (Post 12184981)
I was under the impression that the only 'true' E85 ID injectors at this point were the 1050x and 1750x.



I have built around the basic rule of thumb that e85 carries 2/3 the BTUs of gasoline, so at minimum increase by at least 1/3. This doesn't factor in the timing you're able to throw at your engine when you convert to e85 so again, rule of thumb.

Either way I think you'd need ~8400CC at around 80% duty cycle so you're very close, just make sure that those 1300s are e85 capable.
The easiest thing here would be run a proper pump setup and start with your base pressure at 50-55psi instead of 43.5 (3 Bar). That gets you right at those numbers.

Skeese 05-20-17 12:58 PM
Originally Posted by dguy (Post 12184981)
I was under the impression that the only 'true' E85 ID injectors at this point were the 1050x and 1750x.



I have built around the basic rule of thumb that e85 carries 2/3 the BTUs of gasoline, so at minimum increase by at least 1/3. This doesn't factor in the timing you're able to throw at your engine when you convert to e85 so again, rule of thumb.

Either way I think you'd need ~8400CC at around 80% duty cycle so you're very close, just make sure that those 1300s are e85 capable.
This is all a play to get you to spend more money, or just something else for people to argue against on the internet. It's all just talk. Nobody has actually had any physical proof that there is an issue with any ID and E85.

The ID725/1000/2000 have all been successfully used with E85 time and time again. Hell I used my ID2000's for 2 years and during which they saw about every type of fuel you can imagine, including ALOT of E85, when I sent them back in for servicing/inspection they passed with flying colors.

You won't have any issues running E85 on ANY of the ID injectors.

Skeese

Arca_ex 05-20-17 07:13 PM
The ID1300 was actually their first all stainless injector that is better for e85 compatibility. Should be good to go with great driveability for those power goals.


I actually have 6 brand new ones right here I would be willing to sell, I'm moving to ID1700's myself.


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