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Discussion Starter #1
I have a small block ford that I just converted to E-85. I'm doing this VERY cheaply...in other words, I haven't changed ANYTHING with the fuel system...just re-jetted the carb and now have changed the high speed air bleeds. Went from 84's in the carb to 98's front, 99's rear (can't find any bigger jets). The A/F before was about 13.2-13.3 on the wideband at WOT @ 1200'. With just the fuel change and jet change, I was seeing an average of about 14.5 A/F. I changed the high speed air bleeds from 39's to 28's and it gave me about 14.0 A/F. I've since changed my LM-1 over to E-85 settings (9.8 stoich) and I'm seeing between 9.0-9.5 now. This is too lean (I think).

So, my first question is would anyone suggest changing the high speed air bleeds to blanks? Or, would it be better to drill the jets?

Second, before I was square jetting my plate at 5 psi and seeing 11.8 A/F on the spray. What would be a good baseline for the nitrous to get me a reference for the a/f without burning anything up? I was thinking of going to a 53N 73F to start and see what the a/f looks like. Any thoughts???
 

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Your lean
on motor you need to be around 7.8 AFR WOT on e85 8.8-9.8 for light cruise

If your metering blocks are factory then one of your problems is the mainwell
is to small for e85. I converted a 750 holley with Quick fuel e85 metering blocks successfully. Its currently 80 front 97rear .090 pvcr 25 HSB
You might try going way small or even plugging your HSB to see if you can get enough enrichment. Drilling your jets wont get you anymore fuel.

IF your nitrous kit is NOS I would guess your going for about 125hp.
I would use a 53n [email protected] 6.25 psi
 

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On the nitrous jetting i am using 51n-57 fuel at 7.75 psi and getting good results.On motor(E85) car runs 11.20's-30's @118-125 and with the 51-57 jetting 34* of timing the car has gone [email protected] am also using the stock holley metering blocks as well and my afr is in the 12.6-12.8 on motor and on the shit its in the 11.7-11.9 range.going to a .025hsab should do the trick.I went from 13.8-14.0 to 12.6-12.8 by swapping the 35 for the 25
 

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Discussion Starter #4
On the nitrous jetting i am using 51n-57 fuel at 7.75 psi and getting good results.On motor(E85) car runs 11.20's-30's @118-125 and with the 51-57 jetting 34* of timing the car has gone [email protected] am also using the stock holley metering blocks as well and my afr is in the 12.6-12.8 on motor and on the shit its in the 11.7-11.9 range.going to a .025hsab should do the trick.I went from 13.8-14.0 to 12.6-12.8 by swapping the 35 for the 25
Wow...is yours a sbf? That's awesome that you're able to run 34* timing! What kind of timing do you run on motor?
 

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Discussion Starter #6
You might try going way small or even plugging your HSB to see if you can get enough enrichment. Drilling your jets wont get you anymore fuel.

i
I used JB Weld to plug the HSAB's and it worked perfectly! Now I'm a little on the fat side with 7.8-8.0 on the E-85 scale, or 11.6-12.0 on the gasoline scale. Thanks for the advice!

Now it's time for some track testing.


It's a stock crank and rod 351w.I run 36* on motor and pull 2* for the plate.
Sounds good! Does it seem to make the same power with this tune-up as it did with the gas tune-up (on the spray)?
 

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It is making a little more power with the e85 than gasoline.I picked up .2-.3 over gas.I would drill them a little until it leans out to 12.0-12.5 or so.
 

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Discussion Starter #8
It is making a little more power with the e85 than gasoline.I picked up .2-.3 over gas.I would drill them a little until it leans out to 12.0-12.5 or so.
What is your a/f with your 51n/57f @ 7.75psi tune-up?
 

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Discussion Starter #12
Did some back-to-back testing Friday and Saturday. With same timing, only changes being jets and air bleeds, the car ran identical e.t.'s on motor, with E-85 being rock solid consistant and the gas varying by .02. Turned on some spray, started with 53N/63F and picked up 3 tenths, but it was a little lean at 12.5 a/f. I then went to 63N/82F and picked up another .15. Saturday night I went back with 73N/91F and picked up again...6 tenths faster than on motor. That pass was about 11.0 a/f w/ 950 psi bp. I then changed to 91N/110F and picked up another .15 w/ 11.5 a/f at 1000psi bp. Made another pass with no changes and ran within .006 and IDENTICAL mph.

All in all, with no changes at all, other than bigger main jets and air bleeds, this E-85 is working perfectly!

http://www.youtube.com/watch?v=YFZU_rWpVnI
 

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What is your fuel pressure?The jet spread seems really wide.Right now I am using a 82n-91f jetting and it still a little fat.What were the et's and mph?
 

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