Target A/F with 15+% Replacement?

[Boost231]

was wondering what to shoot for when replacing more the 15% of fuel with alky.

Both 20psi and 30psi?

15%-- What A/F? 20psi? 30psi?
20%--What A/F? 20psi? 30psi?
25%-- What A/F? 20psi? 30psi?


i know the number will be rough. 20 psi would be 91 and alky 30 would be 116 and alky

 

[bison]

was wondering what to shoot for when replacing more the 15% of fuel with alky.

Both 20psi and 30psi?

15%-- What A/F? 20psi? 30psi?
20%--What A/F? 20psi? 30psi?
25%-- What A/F? 20psi? 30psi?


i know the number will be rough. 20 psi would be 91 and alky 30 would be 116 and alky

safe a/f's:

15% 11.3, 11.0
20% 11.0, 10.7
25% 10.8, 10.5

Make sure you have raised the fuel injector cut off in your xfi to an rpm level you will never reach. My numbers for 30psi are for straight C16 with 0% mix of any other fuel in the tank.

 

[Boost231]

Xfi rpm limit. I now know this. Had no idea about it with alky but after reading I now know. I hit fuel cut off 3 different passes and got out of it. I think it was fine. Anyways lesson learned. 1 pass didn't know it reved that high. Another pass didn't set it high enough and the 3rd time I changed programs and didn't look at the set point. Anyways won't happen again. I'm sure all the alky probley burned off once it hit the cylinders anyways

 

[Razor]

One thing also to note is depends on how efficient your IC is. I mean if you run 30 PSI and IAT's are 200+ degree's.. not having the kit spraying would be dumb.

 

[bison]

Xfi rpm limit. I now know this. Had no idea about it with alky but after reading I now know. I hit fuel cut off 3 different passes and got out of it. I think it was fine. Anyways lesson learned. 1 pass didn't know it reved that high. Another pass didn't set it high enough and the 3rd time I changed programs and didn't look at the set point. Anyways won't happen again. I'm sure all the alky probley burned off once it hit the cylinders anyways

Thats how i melted a cyl head. Kept cutting out at 6300. Injecotrs shut off alky stayed on. Never knew it was there till it was too late. There is a seperate cut out for the injectors.

 

[bison]

One thing also to note is depends on how efficient your IC is. I mean if you run 30 PSI and IAT's are 200+ degree's.. not having the kit spraying would be dumb.

Its an 84-85 non intercooled.

 

[Boost231]

wasnt strickly directing it to a hotair setup but i guess we can. i was just putting it out there regardless of intercooled or hotair just so people on here have something to go off of when they do a search about this.

 

[Razor]

Its an 84-85 non intercooled.

I was responding to Bison. On yours its a no brainer.

 

[Steve]

I asked a similar question before and someone replied with a great chart and it is the link below.

http://www.turbobuick.com/forums/al...w-does-methanol-affect-wideband-readings.html