dthompson
Registered User
So I recently discovered that the Sheetz gas stations which are popping up every where down here are selling e85! My long term goal is to switch to the dark side, slap a turbo on my junk, and make around 550whp. So now that it appears that we have several stations selling e85 around here, its now becoming more realistic to consider E85, which makes it realistic to consider going turbo. I found a couple of threads about the subject, but I had a few questions that I did not see answered...
Fuel injector sizing:
I am currently using SD 80s. a quick look at a log shows max injector duty cycle around 70% 5500rpm... so I would estimate 83% at 6500rpm. 70% x 1.3(more fuel for e85) = 91% duty cylce. 83% x 1.3 =1.08% duty cycle Probably too close for comfort? Is this math right?
If I buy new injectors I would want to size them for the 550whp or so. From what I can tell should be around 100#/hr with e85 or 1000cc? or do I need 120#/hr. Any suggestions, size, brand, or otherwise?
Fuel pump sizing:
I assume this ultimately depends on the injector size chosen. 100#/h / 6.1#/gal = 16.3 gal x 6 cyl = 98 gph = 371 lph and that would need to be at 43 + 25 psi = 68 psi fuel pressure. I was planning on replacing the stealth 340lph pump that I have now for something that is E85 compatible. It looks like the Walbro 450 would be pretty close with 100# injectors. Any suggestions here as well. Corey mentioned the fuel lab 41402 I believe.
Fuel lines:
I plan on replacing the fuel lines with the PTFE stuff... -10 feed, filter...-6 return? What about the stock rails? are they ok? (i thought they were steel, so I figured that would be bad)...
Tuning:
Found the notes on the ZFIXEDAFR variable in the GURE strategy. I assume you change this from 14.64 to 9.85? Increase crank PW. Otherwise thats it?
This project is going to get into the pocket a little bit. Any suggestions for appropriate spending is always appreciated.
Thanks,
Derek
Fuel injector sizing:
I am currently using SD 80s. a quick look at a log shows max injector duty cycle around 70% 5500rpm... so I would estimate 83% at 6500rpm. 70% x 1.3(more fuel for e85) = 91% duty cylce. 83% x 1.3 =1.08% duty cycle Probably too close for comfort? Is this math right?
If I buy new injectors I would want to size them for the 550whp or so. From what I can tell should be around 100#/hr with e85 or 1000cc? or do I need 120#/hr. Any suggestions, size, brand, or otherwise?
Fuel pump sizing:
I assume this ultimately depends on the injector size chosen. 100#/h / 6.1#/gal = 16.3 gal x 6 cyl = 98 gph = 371 lph and that would need to be at 43 + 25 psi = 68 psi fuel pressure. I was planning on replacing the stealth 340lph pump that I have now for something that is E85 compatible. It looks like the Walbro 450 would be pretty close with 100# injectors. Any suggestions here as well. Corey mentioned the fuel lab 41402 I believe.
Fuel lines:
I plan on replacing the fuel lines with the PTFE stuff... -10 feed, filter...-6 return? What about the stock rails? are they ok? (i thought they were steel, so I figured that would be bad)...
Tuning:
Found the notes on the ZFIXEDAFR variable in the GURE strategy. I assume you change this from 14.64 to 9.85? Increase crank PW. Otherwise thats it?
This project is going to get into the pocket a little bit. Any suggestions for appropriate spending is always appreciated.
Thanks,
Derek