shaulinmathvader

iTrader: (3)

Ok I have been doing some searching and found based on what i read is that the airfuel ratio should be at 13.0 to 1 at WOT. my friend tells me that the airfuel ration should be at WOT 14.6-14.7 to 1 at all times not matter what. what should i do. getting Lm1 meter next week and I don't know what to do/ What should my AFR be at WOT for Optimm performance.

Billiumss

iTrader: (11)

Your friend needs to read more.... lol

Part throttle A/F about 14.7

WOT A/F 12.8-13.1

foff667

iTrader: (2)

tell your friend to keep his day job & buy himself a clue.

Doc

iTrader: (9)

I take it your friend has a very powerful car that runs WOT on this mixture?

shaulinmathvader

iTrader: (3)

Yes my friend has experience in funny car dragsters with 572 cubic inch 2000 horsepower motors. Not to mention his father who has years of experience.
And won alot of races during his day. Still I don't know. I just hate having to think of running it at the track time after time to see what AFR works and beating on my motor that much.

horist

as stated... don't run you rmotor at 14.7:1 at WOT... that's stoich, but max power on gasoline requires richer than that (12.8-13.1 as stated seems to be ideal for NA LS1)

SmokingWS6

iTrader: (1)

Your friend makes baby jesus cry

Optimal is usually 12.8 in the low TQ range working up towards 13.1 for peak HP.

Doc

iTrader: (9)

Now that was funny. It didn't have anything to do with...

https://ls1tech.com/forums/pcm-diagnostics-tuning/467804-efilive-tuning-help.html

Get a Wideband and the Software suite (Tuners or EFI Live etc.) and you will be on your way to impressing your Top fuel buddy and his dad with the power you, the average dude on the street can now get for a mere pitance compared to the small fortune that goes into a top fuel dragster team.

JBSS71

most racers like that dont know jack about street cars

ninobrn99

iTrader: (8)

here is the problem with your friends knowledge. he doesnt drive the damn thing on the street. he drives it for a few seconds at a time. if he is familiar with it, then he should know that 1. we're talking about gas, not any other race fuel. the perfect burn for gas is 14.7:1. all the gas and air is combusted at that point. on a stock motor if your running that a/f at WOT, then plan on getting a new engine. dont get a WB just cause you wanna see. when your not in PE, you need to be at stoich, depending on what fuel your running as it changes with that.

H-5-L

14.7 is also atmospheric pressure at sea-level.

shizon

iTrader: (1)

You can run it at 14.7 just like he runs his car, but then you can rebuild it after every run just like his car too.

LOL

foff667

iTrader: (2)

actually top fuel cars run at like 1:1 if im not mistaken

ninobrn99

iTrader: (8)

98redorangeta

iTrader: (10)

DO NOT run your car at 14.7 at wot i dont think it would make more power for even 1 run (witch is what top fuel car motors have to last for) lean is mean but i dont like to be that mean to my motor . 12.8 is safe 13.0-13.2 is about as lean as i would go.

rmitchell242

iTrader: (2)

hahaha and an alcohol funny car would be way richer than 14.7:1 too what exactly is he running this lean? I am curious to know

shaulinmathvader

iTrader: (3)

Just got LM1 in and tested it on the oxygen sensor bung( 02 sensor not connected of course) and it richened out I am guessing because 02 sensor was not connected. It read from 11.8 to about 12.5 at WOT it gave me weird figures 20:1 and 35:1 but then again it was not under load and It hits rEv limiter rather quickly. I will be welding in Bung at Y pipe sometime this week and testing some things out by racing it on the street until track day. but you guys are right. I would rather be safe and save the motor.

just one more question. Not considering the damage to the motor. Would it give me more power to run 14.7:1 AFR WOT. If so I am guessing I would have to run high octane but how much?

Dave F

drag cars can run leaner, as they only make a few passes at a time. However, 14.7 is the theoretical perfect ratio, and it simply can't be achieved in the real world. In a streetable car, you need the extra fuel to burn all of the fuel, and the extra fuel helps quench the combustion chamber (stops from melting parts, and prevents detonation).

horist

Due to the increased cylinder temperatures and detonation you'll get, you'll likely lose power...


Leaner = Power only to a certain point... 14.7 is well past that point on these engines...

It's like those that think the more timing you can run the more power you can make... there is a limit at which point you no longer make power... and eventually lose power...

JBSS71

thats why they make alky :wall: but jet sizes on alky carbs are well over 100