A/F ratio with alky?

UL LUZE · 05-13-2007, 09:16 PM

I want to put my car on a dyno, and need to know what a/f ratio to tune for.

Thanks

PaCemkr86 · 05-13-2007, 09:24 PM

11.5 with out
10.5 with

UL LUZE · 05-14-2007, 02:06 PM

Thanks!!

GNCOL · 05-14-2007, 03:12 PM

My car is pig rich at 10.5 when spraying methanol. I adjust to 11.4 with meth.

tbirdv6 · 05-14-2007, 03:23 PM

Quote:

Originally Posted by PaCemkr86

11.5 with out
10.5 with

I would think you have it backwards
with alky you increase the cooling charge(octane rating)& injector duty cycle,so you should be able to do 11.5 with,10.5-10.9 without
FRED

Steve Wood · 05-14-2007, 04:22 PM

No, he has it right.

Stoch for gasoline is ~14.7-1

Stoch for Methanol is ~6.4-1

Therefore, one has to run more than twice as much much methanol to extract the same amount of heat as from gasoline.

One use of alky is for charge cooling, but, the guys making serious power are spraying a lot more and using it for fuel as well as charge cooling. They do this because the "apparent octane" of methanol appears to be a lot higher than the 101 it averages on a gasoline octane engine.

The actual A/F is not some magic figure, however. The more power your car is capable of, the lower the number will be for optimum performance. That means you have to be able to tune with multiple runs until you find the number your car likes....it may be somewhat different than the next car unless the combos and power outputs are similar.

PaCemkr86 · 05-14-2007, 08:18 PM

right on Steve.. i have found that some cars like 10.0 a/f with alky and some perfer 11.0... it all depends on your combo

william brophy · 05-14-2007, 11:24 PM

Quote:

Originally Posted by PaCemkr86

right on Steve.. i have found that some cars like 10.0 a/f with alky and some perfer 11.0... it all depends on your combo

tbirdv6 · 05-15-2007, 07:55 AM

My bad-thats what I like about these boards,you learn if you read & experiment & post your experiences/knowledge for others to learn from.

These APR's, are we talking at WOT?

PaCemkr86 · 05-15-2007, 08:53 AM

yes..

crusing AF ratio is usually alot leaner

Steve Wood · 05-15-2007, 09:45 AM

I cruise around 16 to 18-1. Have not done any experimenting in a number of years to zero in on what gives the best mileage.

william brophy · 05-15-2007, 10:45 AM

Steve cruises around on the real lean side like I do with my ME-R chip which is adjustable for cruise, etc. but most chips do not cruise that lean, when it gets to lean you will feel the car buck a little while cruising.

Steve Wood · 05-15-2007, 11:08 AM

It will buck more than a little at 21

1 RARE T · 05-15-2007, 09:44 PM

Just to clarify.........10-1 is richer and 11-1 is leaner?

I'm at 10.8 at WOT all the way to 100 mp/h +, spraying.

PaCemkr86 · 05-15-2007, 09:56 PM

Quote:

Originally Posted by 1 RARE T

Just to clarify.........10-1 is richer and 11-1 is leaner?

I'm at 10.8 at WOT all the way to 100 mp/h +, spraying.

you are correct

05-13-2007, 09:16 PM	#1 (permalink)
UL LUZE Registered User Join Date: Dec 2004 Location: Windsor, On Posts: 120	A/F ratio with alky? I want to put my car on a dyno, and need to know what a/f ratio to tune for. Thanks __________________ 87 GN 11.80 @ 114.29 TE-60, 3000 stall, Dutt-neck intercooler, Walbro (hotwired), adj. fuel regulator, 50 lb. MSD's, cold air kit, solid maf pipe, volt booster, heated O2, 3" THDP, air bags, pinion snubber, TT street alky chip, SMC alky, TB ported to 62mm & port matched plenum, MT Drag Radials 255/60/15 = 1.55 60'!!!

05-13-2007, 09:24 PM	#2 (permalink)
PaCemkr86 WFO Racing Join Date: Jan 2005 Location: Odem,Texas Posts: 1,252	11.5 with out 10.5 with __________________ Phil Underwood My Turbo Buick

05-14-2007, 02:06 PM	#3 (permalink)
UL LUZE Registered User Join Date: Dec 2004 Location: Windsor, On Posts: 120	Thanks!! __________________ 87 GN 11.80 @ 114.29 TE-60, 3000 stall, Dutt-neck intercooler, Walbro (hotwired), adj. fuel regulator, 50 lb. MSD's, cold air kit, solid maf pipe, volt booster, heated O2, 3" THDP, air bags, pinion snubber, TT street alky chip, SMC alky, TB ported to 62mm & port matched plenum, MT Drag Radials 255/60/15 = 1.55 60'!!!

05-14-2007, 03:12 PM	#4 (permalink)
GNCOL Registered User Join Date: Oct 2000 Location: Mebane, NC Posts: 1,625	My car is pig rich at 10.5 when spraying methanol. I adjust to 11.4 with meth. __________________ Jim: 87 GN with: TE-61/PTE .63 housing; mildly ported stock heads; Erson 208 cam; Speed Pro forged pistons; rebuilt transmission and PTS 3,200 converter; 60# inj.; CAS V-4; 3" DP; ATR 2.5" SS exhaust; 62 JJ TB/stock plenum; RJC power plate; Gen II w/LS-1 MAF; Pete Tomka cold air system; SMC progressive alcohol; Walbro 340; Hoosier QTP (27"); and Extender G chip with 26/22 timing. Best 1/8 mile run: 6.904 @ 100.04 with 1.553 60'.

05-14-2007, 04:22 PM	#6 (permalink)
Steve Wood An American American Join Date: Sep 2000 Location: East of Eden, Texas Posts: 37,165	No, he has it right. Stoch for gasoline is ~14.7-1 Stoch for Methanol is ~6.4-1 Therefore, one has to run more than twice as much much methanol to extract the same amount of heat as from gasoline. One use of alky is for charge cooling, but, the guys making serious power are spraying a lot more and using it for fuel as well as charge cooling. They do this because the "apparent octane" of methanol appears to be a lot higher than the 101 it averages on a gasoline octane engine. The actual A/F is not some magic figure, however. The more power your car is capable of, the lower the number will be for optimum performance. That means you have to be able to tune with multiple runs until you find the number your car likes....it may be somewhat different than the next car unless the combos and power outputs are similar. __________________ ------------------ 'A government that is big enough to give you everything you want, is also big enough to take away everything you have.' - Thomas Jefferson I think one should worry more when people are lining up to get out of a country rather than into it. If they're sneaking in, we must be doing something right. The Chronicles of Zap, from the early 21st century www.vortexbuicks-etc.com

05-14-2007, 08:18 PM	#7 (permalink)
PaCemkr86 WFO Racing Join Date: Jan 2005 Location: Odem,Texas Posts: 1,252	right on Steve.. i have found that some cars like 10.0 a/f with alky and some perfer 11.0... it all depends on your combo __________________ Phil Underwood My Turbo Buick

05-15-2007, 07:55 AM	#9 (permalink)
tbirdv6 Registered User Join Date: Jan 2005 Posts: 44	My bad-thats what I like about these boards,you learn if you read & experiment & post your experiences/knowledge for others to learn from. These APR's, are we talking at WOT?

05-15-2007, 08:53 AM	#10 (permalink)
PaCemkr86 WFO Racing Join Date: Jan 2005 Location: Odem,Texas Posts: 1,252	yes.. crusing AF ratio is usually alot leaner __________________ Phil Underwood My Turbo Buick

05-15-2007, 09:45 AM	#11 (permalink)
Steve Wood An American American Join Date: Sep 2000 Location: East of Eden, Texas Posts: 37,165	I cruise around 16 to 18-1. Have not done any experimenting in a number of years to zero in on what gives the best mileage. __________________ ------------------ 'A government that is big enough to give you everything you want, is also big enough to take away everything you have.' - Thomas Jefferson I think one should worry more when people are lining up to get out of a country rather than into it. If they're sneaking in, we must be doing something right. The Chronicles of Zap, from the early 21st century www.vortexbuicks-etc.com

05-15-2007, 10:45 AM	#12 (permalink)
william brophy Registered User Join Date: Jan 2004 Posts: 1,023	Steve cruises around on the real lean side like I do with my ME-R chip which is adjustable for cruise, etc. but most chips do not cruise that lean, when it gets to lean you will feel the car buck a little while cruising. __________________ WE4 HARDTOP @3700 lbs., 2004R, OEM BLOCK, OEM COMPUTER, AIR CONDITIONED, ETC. GOD BLESS AMERICA

05-15-2007, 11:08 AM	#13 (permalink)
Steve Wood An American American Join Date: Sep 2000 Location: East of Eden, Texas Posts: 37,165	It will buck more than a little at 21

05-15-2007, 09:44 PM	#14 (permalink)
1 RARE T UL LUZE is in the club. Join Date: Oct 2002 Location: Cottam, Ontario, Canada Posts: 537	Just to clarify.........10-1 is richer and 11-1 is leaner? I'm at 10.8 at WOT all the way to 100 mp/h +, spraying. __________________ '87 Turbo-T Lmtd. Full weight fat-ass. Mototron 60's,Ta-49, Stretch Intercooler,Alky Drive to track, lower air pressure, Run 11.82@114.50 Drive home.

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