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E-85 Tunning Questions #1031904
07/13/11 12:09 PM
07/13/11 12:09 PM
Joined: Jan 2003
Posts: 2,771
Cedar Lake IN
CRT Offline OP
master
CRT  Offline OP
master

Joined: Jan 2003
Posts: 2,771
Cedar Lake IN
I would like some advice from the E85 guys. This is my 2nd year on E85, and I really like it, but I have a few issues that I would like to fix.

1st- ever since I switched from race gas to E85 my fuel pressure goes up & down on its own, I set the pressure at 6 lbs and and it creeps up to 7, I then re set it at 6, make a pass, and its down to 4 or 5. I have a new MagnaFuel regulator, cause my BG regulator was doing the same thing, and last year it took a $h*t. and just quit working, my MagnaFuel pump is a few years old. My carb is a 1050 HP dom with the Quick Fuel E85 Kit.

2nd- When the car is warmed up, before I make a pass, it pounds hard out the pipes and sounds good, After a pass, on the return road, and all the way back to the pits, the motor sounds like a different motor, the clean crack out of the pipe is not there and sounds like $h*t. After the car sits for a wile , buy the time I make my next pass, its clean and pounds hard out the pipes.

3rd- Any time I am in the intermediate circuit, it loads up, Now it is clean as soon as I stab it. I tried going up on the intermediate circuit air bleads, but all that did was make the intermediate circuit come on sooner.
Thanks John

Re: E-85 Tunning Questions [Re: CRT] #1031905
07/13/11 04:31 PM
07/13/11 04:31 PM
Joined: Jan 2003
Posts: 16,917
NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,917
NC
When I first went to E85 with a carb, I had a BG regulator and the rubber seat didn't last 1 season (several prior seasons on gas); they are only rated for gasoline.

I am guessing the sound thing could be due to the temperature of the motor. The ethanol likes some heat in the motor (170) to vaporize the fuel. So when the motor is cool, not all the fuel is vaporizing properly. And when it is hot it vaporizes all of it. This might change the sound due to the "effective mixture" (my made up term, I don't know any technical explaination).

So depending how rich/lean the carb is, it could act slightly different hot (190-200) compared to cold (100-150). Most people recommend staging at ~170 water temp and setting up the carb/mixture for that.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: E-85 Tunning Questions [Re: 440Jim] #1031906
07/13/11 05:31 PM
07/13/11 05:31 PM
Joined: Jan 2003
Posts: 4,707
Moved to N.E. Tennessee
GomangoCuda Offline
master
GomangoCuda  Offline
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Joined: Jan 2003
Posts: 4,707
Moved to N.E. Tennessee
The hard crack you are hearing cold could be fuel burning in the headers.


In theory, there is no difference between theory and practice. In practice, there is.
Re: E-85 Tunning Questions [Re: CRT] #1031907
07/13/11 08:03 PM
07/13/11 08:03 PM
Joined: Sep 2005
Posts: 2,442
LOWELL IN
Q
QWK_ENUF Offline
top fuel
QWK_ENUF  Offline
top fuel
Q

Joined: Sep 2005
Posts: 2,442
LOWELL IN
i too had a BG regulater go to crap. i switched to a couple of the small holley reg and have been awesome.

i stage at 170 deg and mine also sounds a little different on the return road but the temp is higher also. i just assume its the nature of the beast with a 3 circuit dommy.

but when at idle, on the trans brake, or at full throttle its all buisiness...

this is my reg set-up
set at 6 psi and is dead stable

6728244-regulater2.jpg (96 downloads)

WAXER
Re: E-85 Tunning Questions [Re: QWK_ENUF] #1031908
07/14/11 12:10 PM
07/14/11 12:10 PM
Joined: Jan 2003
Posts: 2,771
Cedar Lake IN
CRT Offline OP
master
CRT  Offline OP
master

Joined: Jan 2003
Posts: 2,771
Cedar Lake IN
Tommy , I went to 41 last night to test a customers 727 in my car (it had no low gear set ) I fix the fuel pressure, Batt volts was too low last time out. Car ran 10.20-10.15 in 70* air, I am sure it would have run 10 flat with the low gear set with last nights air.

Re: E-85 Tunning Questions [Re: CRT] #1031909
07/14/11 01:16 PM
07/14/11 01:16 PM
Joined: Jan 2003
Posts: 16,917
NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,917
NC
Quote:

I fix{ed} the fuel pressure, Batt volts was too low last time out.


Good to hear you found the root cause of issue #1) fuel pressure creeping up and down.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1






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