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Old 12-11-2014, 04:33 PM   #1
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E85 questions

Wondering about the pros and cons of E85? Will I need my fuel system upgraded?
About my car 2004 Mustang gt 4.6 bord .32 over. Fully forged internals, cobra crank, trick flow 44cc heads, stage 2 comp cams stock intake mani (previous owner was going to put a kenne bell on it) full exuast, cobra fuel pump, bbk fuel rails and I believe stock injectors. Right now I'm at 412rwhp. Been trying to gather all info I can tried doing a search with very little help.
My goal is to extract as much power I can being a naturally aspirated car. Using it as a summer driver and weekend track car.
Any and all info would be greatly appreciated. Thanks

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Old 12-11-2014, 04:56 PM   #2
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E85 is pretty much 105 octane. However, it flows about 30% more, so you need to really upgrade the fuel system to run it. On the 99-04 is pretty much means converting to a return style fuel system if you plan to run it with boost. If its NA then a dual pump returnless set up can work.

Just one question.... You say you have the stock manifold on it, so no supercharger? How are you making 412 horsepower? I guarantee you are not at that much power without a supercharger, with one sure i can see that. But not without.
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Old 12-11-2014, 04:59 PM   #3
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Heads, cams fully built motor bord .32 over and built trans...

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Old 12-11-2014, 05:05 PM   #4
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Would E85 be practical for something I plan on driving as a daily in summer?

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Old 12-11-2014, 05:08 PM   #5
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Yea it is, just have to make sure you can get it fairly easily. MPG does go down though. Since it flows about 30% more.
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Old 12-11-2014, 05:10 PM   #6
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We have E85 at almost every gas station in Milwaukee.

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Old 12-11-2014, 05:12 PM   #7
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That'll work. I'm still wondering about the power numbers you said. You said you are trying to make all the power you can out of being naturally aspirated, how did you get to 412rwhp all motor? There are only few NA 4.6 2v cars with that much power all motor and they have super amounts of money invested. With your mods you shouldn't be anywhere near that number.
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Old 12-11-2014, 05:15 PM   #8
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Yes. The only reason I bought this car is cause I watched this gut build it over the years. He has around 20 grand in the car. And 42 thousand miles on body..2k on build

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Old 12-11-2014, 05:17 PM   #9
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Go for the e85. You will need a different fuel system all together though.

But you are not at 412 hp

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Old 12-11-2014, 05:17 PM   #10
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He had the motor out for a whole year and just kept going. He did the machine work his self.

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Old 12-11-2014, 05:18 PM   #11
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I will see if I can get the dyno sheets. I just talk to him today and will be at his house doing some work this weekend

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Old 12-11-2014, 05:19 PM   #12
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Its still not adding up. Did you physically see the car on the dyno make those numbers?

What i'm seeing is forged internals with head work, slightly lowered compression, stage 2 cams. With that you should be lucky to see 320rwhp.

The only way i've seen a 4.6 2v get to 380+ is with super high compression, or a big bore stroker set up.
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Old 12-11-2014, 05:26 PM   #13
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Does not matter how long he had the motor out of the car.

If your mods are what you say, you are nowhere near 412

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Old 12-11-2014, 05:31 PM   #14
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We will see.... I didn't see the numbers. But he says he has the sheets. Also I'm sure that's not the complete list. That's what I know off hand.

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Old 12-11-2014, 05:35 PM   #15
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Since you are running normal pump gas unless the car is a big bore stroker motor you won't see that much power, since the car obviously doesn't have high compression.

It sounds like the guy lied to you honestly.
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Old 12-11-2014, 05:39 PM   #16
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Hope not..... I will see and post all the mods and dyno sheet. It's the only reason I bought this and not a trans am

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Old 12-11-2014, 05:39 PM   #17
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With the mods you listed the average horsepower is around 310-320rwhp.
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Old 12-11-2014, 05:42 PM   #18
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I'd be pissed but like I said I will post all the info later. im sure there is more.

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Old 12-11-2014, 05:44 PM   #19
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I'd be pissed but like I said I will post all the info later. im sure there is more.

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Well there better be alot more. Like bigger cams then you got high *** compression. And you better already be on e85 or race gas

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Old 12-11-2014, 05:46 PM   #20
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If the car doesn't have a high compression then the only other way i've seen is a big bore stroker set up. Taking it from 4.6 to 5.3
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Old 12-11-2014, 05:48 PM   #21
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How big of a bore??

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Old 12-11-2014, 05:52 PM   #22
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How big of a bore??

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3.7" bore with a 3.75" stroke. Turns the motor into a 5.3.

Crank the volume for this one, and read the description for mods. This one is a Big Bore Stroker set up.

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Old 12-11-2014, 05:56 PM   #23
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Your .32 bore that you say you have. Makes it almost a 4.7 so about a 287

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---------- Post added at 05:56 PM ---------- Previous post was at 05:55 PM ----------

You got lied to. Simple

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Old 12-11-2014, 05:56 PM   #24
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This one is a super high compression set up, can only be run on E85 or Race Gas. Neither actually have 400 horsepower. One has 383 and the other has 393. Both have built motors though.

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Old 12-11-2014, 05:59 PM   #25
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3.7" bore with a 3.75" stroke. Turns the motor into a 5.3.

Crank the volume for this one, and read the description for mods. This one is a Big Bore Stroker set up.

That is one bad a$$ sounding GT.

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Old 12-14-2014, 07:01 PM   #26
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SO this is what info I got today. Let me know if this makes sense on the hp levels he told me this thing puts out. but no Dyno sheet yet. He said these were the pistons he used. Other then that Cold plugs, Accel coil packs. Cobra fuel pump, cobra crank, 80 mm mass air sensor, k&n cai, 75 mm bbk throttle and plenum, Comp stage 2 cams. Under drive pullies, comp springs can't remember what lifters but not stock. BBk hi flow fuel rails rails. 1 5/8 slp long tube headers, 2 1/2 X pipe with Borla cat backs. 44cc TF heads. Plus more but doesn't pertain to the hp. Does this make sense? Now I will tell you I don't know much about the 4.6 motor except how durable they are.

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Old 12-14-2014, 07:03 PM   #27
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These are the pistons used

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Old 12-14-2014, 07:04 PM   #28
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E85 questions

Nope. Nowhere near 412, you are lucky if you will see 320-340 to the wheels.

Put it on a dyno and find the real numbers.


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Old 12-14-2014, 07:05 PM   #29
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Only things done to it for power are the heads/cams and exhaust. And throttle body and the UDP. Your car does not make what he says.

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Old 12-14-2014, 07:06 PM   #30
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-6 CC dish? That's questionable, if it was a compression like that you would be around a 11-11.5:1 compression


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Old 12-14-2014, 07:07 PM   #31
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Is that a full stroker kit or just the pistons?


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Old 12-14-2014, 07:08 PM   #32
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-6 CC dish? That's questionable, if it was a compression like that you would be around a 11-11.5:1 compression


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Still will not get him to that power level on pump gas. Could care less what anyone says. Not going to happen

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Old 12-14-2014, 07:08 PM   #33
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Smh....I can say I'm a little disappointed. I'm going to have to wait till spring to dyno it.

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Old 12-14-2014, 07:09 PM   #34
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Never trust someone else's claims for modifications done unless he has all the receipts and a dyno sheet to prove it.


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Old 12-14-2014, 07:09 PM   #35
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What hp rating you you guys think it can handle?

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