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Old 02-15-2010, 11:00 PM   #1
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Default Estimate of HP gain with using E85 in my SS

I am considering upgrading to a dual flash PCM so I can run a 93 octane tune and an E85 tune. For you guys that have experience with boosted E85 conversions what do you think I would be able to gain at the wheels with my 99 SS. Right now its @ 12#'s with the airlid on and 14#'s with the lid off if makes any difference in the end. Thanks, Matt.
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Old 02-17-2010, 12:34 AM   #2
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Maybe if someone has switched from a 93 tune to an E85 tune they could post up what their before and after rwhp was. ?
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Old 02-17-2010, 10:21 AM   #3
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I'd imagine it wouldn't be too great of a gain unless you were to change your compression to take advantage of the higher octane. Could be wrong...
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Old 02-17-2010, 10:28 AM   #4
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I would guess at least 40hp since you are forced induction.

Feel free to give me a call if you want to discuss a pump upgrade that you will need to support this power level.
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Old 02-17-2010, 01:23 PM   #5
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Originally Posted by claytonisbob View Post
I'd imagine it wouldn't be too great of a gain unless you were to change your compression to take advantage of the higher octane. Could be wrong...
I am not sure what compression it would be but at 14#'s its got to be fairly high...Anybody know the relation between lbs of boost/per the ratio of compression?


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I would guess at least 40hp since you are forced induction.

Feel free to give me a call if you want to discuss a pump upgrade that you will need to support this power level.
Ok 40 is nice, and you guys are only an hour away too...I should be ok with my current pumps I have the Walbro twins on board
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09 gt 500/01 silverado stock/77 ram runs on LPG/2012 Sierra 2500 CCSB runs on LPG
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Old 02-17-2010, 08:30 PM   #6
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Walbro twins should be OK if the rest of the fuel system is up to the task.

If interested in some regulator upgrades etc. feel free to give ma a call.
You will likely need a few additional components to support the extra fuwl volume.
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Old 02-18-2010, 10:47 AM   #7
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Yes you have to remember E85 requires 33% more fuel volume if you are at 650rwhp now you will need 870rwhp worth fuel delivery stock lines and reg will not keep up with that.
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Old 02-18-2010, 12:18 PM   #8
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Yes you have to remember E85 requires 33% more fuel volume if you are at 650rwhp now you will need 870rwhp worth fuel delivery stock lines and reg will not keep up with that.
That is a nice number that I wish it would have just by switching haha...my current fuel system is a single walbro 255 in tank and one in-line. Then to a boost referenced regulator, the stock rail, with 75# injectors. Larry@speedinc did the tuning and current setup, he says that it is capable of handling it but they dont do E85 tuning at the current time. I just want to see if its worth spending the money to upgrade to a dual tune pcm and also have a second tune. I am looking at around $500 bucks for it and a gain of??? Hence the reason for this thread....Matt.
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09 gt 500/01 silverado stock/77 ram runs on LPG/2012 Sierra 2500 CCSB runs on LPG
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Old 02-18-2010, 12:28 PM   #9
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lolol
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Old 02-19-2010, 12:44 AM   #10
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^ did I miss something?
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Old 02-19-2010, 12:06 PM   #11
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E85 is just a high octane fuel, like low power race gas except that you'll just need a lot more of it. The only way to make power with E85 is to turn up the boost or raise compression. Since you have already maxed out your supercharger you'll likely loose power going to E85.

I'd invest in a good methanol injection kit and call it a day. I have back to back dyno runs where I gained 40hp with methanol vs none. Of course, you need a tune to take advantage of the cooler IATs and a good injection controller to ramp the flow in with boost.
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Old 02-19-2010, 12:19 PM   #12
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Quote:
Originally Posted by TransAmatt99 View Post
^ did I miss something?
YES you need more fuel DELIVERY not that you will make that kinda power you just need that much worth of volume to make the same power you already do. E85 fuel delivery is 33% more VOLUME needed that reg. gasoline.

If you made 650hp on gas you will need much more fuel (870 worth of Volume) for E85. Much more fuel pump and larger lines.
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Old 02-19-2010, 12:23 PM   #13
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Quote:
Originally Posted by white01ss View Post
E85 is just a high octane fuel, like low power race gas except that you'll just need a lot more of it. The only way to make power with E85 is to turn up the boost or raise compression. Since you have already maxed out your supercharger you'll likely loose power going to E85.

I'd invest in a good methanol injection kit and call it a day. I have back to back dyno runs where I gained 40hp with methanol vs none. Of course, you need a tune to take advantage of the cooler IATs and a good injection controller to ramp the flow in with boost.
You gained more power from cooler intake temps (inefficient intercooler) and lack of fuel volume (not enough pump or delivery).
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Old 02-19-2010, 01:54 PM   #14
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^ did I miss something?
I was meaning the guy that said lolol....oh well haha.

Quote:
Originally Posted by Nasty N8 View Post
YES you need more fuel DELIVERY not that you will make that kinda power you just need that much worth of volume to make the same power you already do. E85 fuel delivery is 33% more VOLUME needed that reg. gasoline.

If you made 650hp on gas you will need much more fuel (870 worth of Volume) for E85. Much more fuel pump and larger lines.
I follow what you are saying about the ~30% increase in fuel...If I do the fuel injector calculator my injectors should be good to right around 900hp@80% duty. All of the fuel system has been upgraded when the new longblock was installed and should be up to the challenge. Alot of people on here say they gain alot because they can crank up the timing which is what I am trying to figure out.
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Old 02-19-2010, 03:09 PM   #15
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E-85 will give a slight increase in power in an N/A motor and more when FI.

http://www.gmvsworld.com/index.php?a...7f9b76260379d5


[quote author=Clint@A.I.R. link=topic=194.msg3226#msg3226 date=1262462251]
Again Fan of E85... :cooldance: Congrads on your results Dave. Over 50RWHP and 50RWTQ just for changing over to E85.

Click the image to open in full size.

Clint
[/quote]
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Old 02-19-2010, 08:20 PM   #16
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Thats exactly what I was looking for, it seems over 50 could be had at 1/3 the price of race gas....keep em coming!
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Old 02-20-2010, 12:50 AM   #17
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That is my dynosheet that Vaticano just posted. My mods are in my sig. We were able to come up 7 or 8 degrees in timing I believe. My duty cycle is at 100% there also. I need to move up from the 42#ers to the 60#ers.
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Old 02-20-2010, 03:21 PM   #18
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From my experience with e85 conversions, we typically pick up 5% after tuning mild n/a applications. High compression and/or forced induction car & trucks pick up a LOT more.
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Old 02-20-2010, 11:16 PM   #19
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i would definetly get rid of the stock rails when going to run e85.
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Old 02-21-2010, 01:27 PM   #20
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FWIW, I've pushed the limits on the stock fuel system. I'm making close to 900 hp at the crank in e85 with dual walbros and 95lb/hr injectors. That's it, the rest of the fuel system is stock, rails, lines, regulator, filter, still dead head.

Not ideal, but it's been working. Swapping to return style now because I need more fuel.
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