E85 Tuning Tips
08-17-2010, 11:27 AM
#1
E85 Tuning Tips First, I've tuned for E85 before, but was over 2 years ago and for my bolt-on LT1. Now that I'm heads/cam/higher compression, I want to get the tune better dialed in. It has a mail-order tune from MadZ28.com on it now.
I already have tweaked the injector constant to 38# for the 60# injectors to get the LT BLM's close to 128. Installing the LM1 today to fine tune the WOT tables. I've already tweaked them initially to shoot for 12.0 A/F (using gas display = .81 lambda).
What about timing tables? Where to add/leave as-is/subtract? Want people with experience with E85 to help with this if possible.
My compression is 11.7/9.3 , cam is 226/226 .582/.582 110 LSA, EB Porting heads.
I already have tweaked the injector constant to 38# for the 60# injectors to get the LT BLM's close to 128. Installing the LM1 today to fine tune the WOT tables. I've already tweaked them initially to shoot for 12.0 A/F (using gas display = .81 lambda).
What about timing tables? Where to add/leave as-is/subtract? Want people with experience with E85 to help with this if possible.
My compression is 11.7/9.3 , cam is 226/226 .582/.582 110 LSA, EB Porting heads.
08-18-2010, 12:10 PM
#4
I just got my wideband bung installed in the y-pipe today. I may try running open loop to tweak the tune now starting with the wideband in one bank at a time, then going to the y.
A narrow band O2 just reads stoich, which is ~9.8 for E85, so when running the O2's in closed loop, the computer adjusts the fuel to keep the BLM's at 128, which is stoich. SO if tuning for BLM's, you adjust either the injector constant to get close to 126-132 Long term BLM's or adjust the MAF Calibration. Either will get it close. I prefer to tweak the injector until close, then fine tune with the MAF Calibration.
What about timing?
I have read for E85 to run anywhere from more to less to the same timing as gas. Has anyone dynoed E85 to test for best results with timing?
A narrow band O2 just reads stoich, which is ~9.8 for E85, so when running the O2's in closed loop, the computer adjusts the fuel to keep the BLM's at 128, which is stoich. SO if tuning for BLM's, you adjust either the injector constant to get close to 126-132 Long term BLM's or adjust the MAF Calibration. Either will get it close. I prefer to tweak the injector until close, then fine tune with the MAF Calibration.
What about timing?
I have read for E85 to run anywhere from more to less to the same timing as gas. Has anyone dynoed E85 to test for best results with timing?
08-19-2010, 12:13 PM
#6
Turns out I had an injector harness come loose, so yeah, 38# was way too rich, at 44.2# right now and the BLM's are getting close to 128 now, just a little more tweaking and then I can fine tune the WOT A/F.
What A/F (or lambda) are you running at WOT?
What A/F (or lambda) are you running at WOT?
08-19-2010, 07:19 PM
#7
I haven't dyno'd the new motor yet, waiting for powermaster to fix/return my starter 
i'll get some logs and stuff up eventually but it's gonna all be calmap files for DFI. Trending Topics
08-26-2010, 10:29 PM
#10
Getting ready to switch. You guys think 42lbs will be enough for ~475 RWHP.
A friend of mine at colorado performance unlimited is putting me together an awesome kit with an aeromotive filter with removable / cleanable metal screen element ,-8an braided SS feed line, and all the fittings to run 2 pumps for less than 250. I'm going to try and get him to put together a kit.
A friend of mine at colorado performance unlimited is putting me together an awesome kit with an aeromotive filter with removable / cleanable metal screen element ,-8an braided SS feed line, and all the fittings to run 2 pumps for less than 250. I'm going to try and get him to put together a kit.
08-26-2010, 10:55 PM
#11
sounds like a good plan! the 42s on e85 are like a 32# on gas at stock fuel pressure. run em at 60psi or so and you'll be at ~38# on gas which would be perfect. thats what i'm going to do with my 60s when i start maxing em out on nitrous, 60psi on those will be like 54s which are theoretically good for ~800hp.
08-27-2010, 09:04 AM
#13
I would err on the side of larger injectors, as you want to keep the duty cycle below about 80% for best performance. On my setup my 60# are acting as 44.3# to keep stoich, and I should be about 475 or so flywheel (~400 rwhp) myself. It would suck to buy injectors just to find out they are going over 80% DC at WOT. Trust me, I did that when I converted to E85 as a bolt-on car and was hitting 100% with 30# SVO's about 5200 RPM.
Wicked94Z, what heat range plug would you recommend? I have Autolite 104, which is recommended for gasoline LE2 setup and my 11.7-8 CR, and is one step cooler than stock, extended tip. However, I am now getting a high RPM miss, but of course no knock retard, and upon pulling the plugs, they look clean, but have a few specs on the porcelain, suggesting some possible pre-ignition.
So do you feel as though a 7 heat range, non-extended plug should be used?
Wicked94Z, what heat range plug would you recommend? I have Autolite 104, which is recommended for gasoline LE2 setup and my 11.7-8 CR, and is one step cooler than stock, extended tip. However, I am now getting a high RPM miss, but of course no knock retard, and upon pulling the plugs, they look clean, but have a few specs on the porcelain, suggesting some possible pre-ignition.
So do you feel as though a 7 heat range, non-extended plug should be used?
08-27-2010, 08:05 PM
#14
Extended tip will help your idle quality, especially when cold. Take a picture of a plug if you can, could be just carbon getting cleaned by the e85? Nevermind, read your first post about running E85 before. I'd run a 104 with your setup, post a screen shot of your timing tables if you can.
08-27-2010, 09:30 PM
#15
I would err on the side of larger injectors, as you want to keep the duty cycle below about 80% for best performance. On my setup my 60# are acting as 44.3# to keep stoich, and I should be about 475 or so flywheel (~400 rwhp) myself. It would suck to buy injectors just to find out they are going over 80% DC at WOT. Trust me, I did that when I converted to E85 as a bolt-on car and was hitting 100% with 30# SVO's about 5200 RPM.
