E85 USERS PLEASE PULL UP A CHAIR - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 13 Old 06-21-2010, 09:10 PM Thread Starter
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E85 USERS PLEASE PULL UP A CHAIR

Hey guys, I know you have prob reed 1000 threads on this and thats why Im asking. I have a pms on my twin turbo stock headed set-up. I have it dialed in with a 14.2-14.3 a/f at idle and through the power band it drops to 11.2 at wot. My duty cycle is 62% with 42lb injectors at wot. With that being said i would like use E85 for the octane and not really to add more timing or more boost but as a saftey measure like adding race gas but not going broke. I understand that the talk is to increase your fuel system 20-30% because of the volume it takes to burn e85. My qeustion is cant I bump my base fp to 50 and tune my a/f back to 14.2-14.7 at idle and then through out my powerband to a 11.2-11.5 at wot? The things Im reading are to add 20% fuel at idle and 30-40% at wot and watch the duty cycle so it stays under 90%. Let me know if Im in the right ball park here guys, yeah I know 60lb injectors are the best and safest way. But not in the budget at this moment. Thanks again , and just let me know if im close here, and if anyone has used a pms to adjust their e85 set-up.

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post #2 of 13 Old 06-21-2010, 11:03 PM Thread Starter
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just dumped all the 93 out of the tank and put in 4.5 gals of e85. Started it up and the a/f was at 17.5-18.5, bumped the base fuel pressure up to 50psi and the a/f came down to 15.5-15.9, went into the pms and added 20% fuel to idle mixture and a/f came down to 13.9-14.2ish, added 10%fuel in the part throttle tables , then in the wot fuel tables added 30% in the 2200-7800rpm ranges. now the a/f under boost is 10.8-11.2 didnt touch the timing tables at all. the duty cycle went to 82% at wot. Car starts right up and idles smooth, idle did go up about 150rpms , but throttle response is really snappy , im pleased with my little test.

post #3 of 13 Old 06-22-2010, 05:18 PM
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What is the whole engine, fuel system and turbo setup. I have 60lb injectors with stock lines and e85. My injector duty cycles are in the mid 90s. How many lbs? I run 11-12 out of my tp38.


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Last edited by goatnipples2002; 06-22-2010 at 10:21 PM.
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post #4 of 13 Old 06-22-2010, 08:29 PM
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Quote:
Originally Posted by zombiestang View Post
just dumped all the 93 out of the tank and put in 4.5 gals of e85. Started it up and the a/f was at 17.5-18.5, bumped the base fuel pressure up to 50psi and the a/f came down to 15.5-15.9, went into the pms and added 20% fuel to idle mixture and a/f came down to 13.9-14.2ish, added 10%fuel in the part throttle tables , then in the wot fuel tables added 30% in the 2200-7800rpm ranges. now the a/f under boost is 10.8-11.2 didnt touch the timing tables at all. the duty cycle went to 82% at wot. Car starts right up and idles smooth, idle did go up about 150rpms , but throttle response is really snappy , im pleased with my little test.
Sounds good. You will LOVE the E85

New build in progress: Twin Gen 2 PT6466 352

Old combo:352 single 76mm turbo, 16psi, AOD, 9.41 @ 149mph, E85, 255/50/16 MT DR, 3500lb STREET car driven everywhere.
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post #5 of 13 Old 06-22-2010, 09:11 PM Thread Starter
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310ci, stock ported heads, holley lower w/ cartech boxed upper, 65mm tb, trickflow II cam, twin garrett 57mm turbos, stock lines , stock rails, 255hp intank, 255inline, 42lb injectors, big fmic, msd digital6+, anderson pms with 2bar map,boost referenced reg. 10* timing.
I noticed today the duty cycle went up to 89% when I took up to 6100rpm but i was at 13lbs of boost and my fuel pressure was still climbing into the 60+ psi a/f was at 10.6, the car has a little herky jerky like it really wants me to feed it throttle. Just a little fine tuning on this and it shld be good for a month or two until i can afford a 60lb set-up
I have the pms pulling 2* timing every lb of boost it sees also

Last edited by zombiestang; 06-22-2010 at 09:21 PM. Reason: 11111111111111111111
post #6 of 13 Old 06-23-2010, 09:29 PM Thread Starter
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Goatnipples- have you had ur car dynoed?
post #7 of 13 Old 06-23-2010, 09:43 PM
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I thought the lambda reading was the same for e85, or gasoline... How can it change just by adding fuel?
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post #8 of 13 Old 06-23-2010, 10:04 PM
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Unless he is using a wideband and not going by lambada figures
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post #9 of 13 Old 06-23-2010, 10:29 PM
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No dyno...not yet. I should be around 450ish. Upper 500s after the Eddy head swap.


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post #10 of 13 Old 06-23-2010, 10:44 PM
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I would go ahead and add some timing in there too Zombie.
The E85 should take it easy.

Whats E85 rated at again ? 110 octane ? 105 ?


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post #11 of 13 Old 06-23-2010, 10:57 PM Thread Starter
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Yep using a innovate wideband, the e85 a/f is the same # to shoot for as gasoline. But the e85 burns at a faster rate and more volume ( from what i have read) so when I added the e85 the a/f went lean to high 17s, so I turned the base fp up and then added the fuel in the idle table in the pms and in the wot tables. When i added to the base fp it brought the a/f back to 15.5 or so, then went into the pms tables
post #12 of 13 Old 06-23-2010, 11:05 PM Thread Starter
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105 octane r.barn, but it also makes the cylnders run cooler. For an example: i went to the parts store for a few things and on the way back my electric fan stopped working, i was about 5 miles from home. The fan would glitch, it would come on go off, never ran consistent on the way home.. anyway my grnd wire was loose. The car never went over 205* talk about wow. i was amazed , it was about 92* outside that day , my car is blk also so its a heat magnet. I got the fan grnd fixed now it stays at 190* with the fan on low and its 90-95* outside and driving around for 25-30mins in traffic. I luv it, my fan is also wired to run on high. I have a markviii fan its a two spd fan.
post #13 of 13 Old 06-23-2010, 11:16 PM Thread Starter
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93coupee, the lamda for e85 is 9.7 which is the same reading as 14.7 for gasoline. Everything Ive been reading says if you using e85 and a stadard gasoline wideband just tune for the same a/f #s that you would target for gasoline. If you have pointers on this e85 tunning thing let me know. id hate to tune it wrong and blow something. Thanks
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