e85 turbo guys, need help.

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Nov 15, 2009 | 10:19 PM

needaz28

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From: tucson

e85 turbo guys, need help.

so we tried tunning for e85 and sd today. got the fueling about dialed in, a/f is about 11.5 or so, but now it's blowing out spark. I'm running tr6's gapped to .032. what are you guys running for plugs and gaps?

Last edited by needaz28; Nov 15, 2009 at 10:30 PM.

Nov 15, 2009 | 10:29 PM

jason02Z

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From: cape cod mass

tr6's should be fine but a/f is way to rich for e85. 11.5 is good for gas, what do you run for timing, try somewhere around 8.5

Nov 15, 2009 | 10:55 PM

z28boysteve

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From: Houston

What the last guy said except 11.1 is way too LEAN for E85, go look up the stochiometic burn rate the Ethanol, or E85 as you need to burn it around 7:1 or something ... 11:1 your not spraying nearly enough in there! and if your boosted, hell I run about an .018 plug gap to make sure that sob fires.

Nov 16, 2009 | 12:06 AM

shoemike

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From: Prescott, AZ

E85 stoichiometric 9.765:1

Nov 16, 2009 | 12:15 AM

needaz28

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From: tucson

we had it at about 16* timing. i'm going to get some new tr6's and gap them way down, I was thinking .020-.024 gap. I'll try .02 and see what happens. I'm loosing fuel presure right now. I have 2 255 pumps, I have a 3rd pump here and I'm going to start on my custom top hat monday. (I'm a aerospace machinist) I'll once we get the spark problem figured out I'll talk to my tuner and get it down to where it need to be.

Nov 16, 2009 | 12:24 AM

black98ws6ta

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From: louisville,ky

There should not be a reason you are "blowning out spark" I have used tr6's to 1000 rwhp at .030, and currently using them at .030 on my 800rwhp stock motor on e85.

Nov 16, 2009 | 10:47 AM

NicD

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From: Chandler, AZ

I am assuming your are still using a gasoline a/f reading which puts that 11.5 at an acceptable WOT reading for E85 although I prefer closer to a high 10/low 11. If you are blowing out the spark maybe gap down to .028 and see if it's any better.

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Nov 16, 2009 | 12:31 PM

shoemike

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From: Prescott, AZ

Quote:

Originally Posted by NicD

With E85 EQ1 being 9.7AFR?

Excuse my ignorance,
but if 9.7AFR = EQ1 for E85 then high 10/low 11 would be lean @ WOT.

In the flex fuel OS' EQ1 moves with Ethanol%
but PE EQ stays the same.
Example:
0% Ethanol EQ1=14.63AFR
0% Ethanol PE EQ 1.17=12.5AFR
E85 EQ1=9.7AFR
E85 PE EQ1.17=8.3AFR

Nov 16, 2009 | 01:00 PM

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NicD

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From: Chandler, AZ

Quote:

Originally Posted by shoemike

Assuming that the wideband is still setup for reading a gasoline AFR then it would be correct. If it was setup to display ethanol AFRs then what I said would be wrong. All wide bands read lambda and then convert to the fuel type AFR for display. The Lambda measurements for E85 compared to regular gasoline are fairly close so if you are referencing a gasoline AFR wideband that's what I would shoot for.

Nov 16, 2009 | 03:28 PM

#11

Zombie

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From: Las Vegas

This is why people should work in lambda vs AFR, it eliminates the confusion.

I tune to 0.75 lambada on E85 which would read as 11.0:1 AFR on a gasoline wideband. Max rich power on E85 is 0.71 Lambda.

FWIW, I gap to .025 on my plugs.

Nov 16, 2009 | 03:48 PM

#12

NicD

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From: Chandler, AZ

Quote:

Originally Posted by Zombie

This is why people should work in lambda vs AFR, it eliminates the confusion.

I don't see the confusion in just leaving your wideband alone and using the gasoline AFR since the lambda values basically line up instead of doing the math each time to reference it.

Nov 16, 2009 | 06:13 PM

#13

Zombie

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From: Las Vegas

Quote:

Originally Posted by NicD

I don't see the confusion in just leaving your wideband alone and using the gasoline AFR since the lambda values basically line up instead of doing the math each time to reference it.

I was referring to people on the boards talking about the AFRs, one guy says too rich and the next guy says too lean lol. It is a bit confusing at first until it clicks.

Nov 16, 2009 | 08:53 PM

#14

needaz28

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From: tucson

ok,so i will gap them to .026 then

I'll make sure I'm seeing at least 11.0 when boost hits. i guess nothing really changes, because when we tuned before we tuned it to 10.5-11.0 when boost hit.

thanks

Nov 16, 2009 | 09:00 PM

#15

98Z28CobraKiller

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From: WPB, FL

I run #8's NGK 7317 gapped at .022. I was blowing them out at .030.

Dec 9, 2009 | 05:17 PM

#16

maxgee

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From: Canton, Ga

I'm running 9psi on e85 with 19* timing and my plugs are at .32. Pulled them recently and they all look great. How much boost are you running?

Dec 10, 2009 | 11:48 AM

#17

needaz28

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From: tucson

I'm running 10psi on a stock bottome end with a 76mm turbo. Might put the bitch on kill here soon as I'm getting closer to putting a fresh motor in it. I'm going to try a jy 5.3 with a zo6 cam/springs/comp pushrods and 317 heads. Run that while I build my 400+ cube engine.

The car has gone 125 on a slipping clutch and cly 7 down around 100psi. The other 7 clys are at 150 psi. 9" is going in by new years. I think I can get a 5.3 to low 10's on "pump" gas. (E85)