air / fuel ratio - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

oldman14ss · 03-25-2018, 11:13 AM

air fuel optimum is 14 to 7 correct? at wide open throttle what are you guys opinion on an AFR for a highway car ? I kinda need to be conservative for I will possibly driving high speed at extended duration not a 1/4 at a time but possibly 40 miles at a time and not want to lean out the dreaded number 7 cylinder.

oldman14ss · 03-25-2018, 11:15 AM

oops meant to say thank you ahead of time, gonna turn 60 in august and I got a bucket list going. thanks the oldman....

frankwjr · 03-25-2018, 11:57 AM

high speed or high rpm? big diff so unless ur on the salt flats IMHO ur good to go...peace

btw - I would be more concerned with tires....just sayin. and of course the brakes up to snuff too...lol

DSMer1 · 03-25-2018, 12:32 PM

What mods are done to the car?
What fuel?
It is easier to use Lambda scale, that way it dosen't matter what fuel we are talking about.

07-SRT · 03-25-2018, 03:13 PM

Is the car N/A ? If so 12.2 to 12.5 at Wot is safe.

Pro-tuned · 03-25-2018, 05:17 PM

[QUOTE= not want to lean out the dreaded number 7 cylinder.[/QUOTE]
This is a discussion for the tuner and depends on your setup and goals. Some engines like more fuel some less. As an example; for boosted applications to avoid knock the tuner can reduce timing, increase fuel, or reduce boost. The trick is to optimize all three areas and complete these adjustments in segments and finally smooth out transitions.

oldman14ss · 03-25-2018, 07:10 PM

high speed, I have good brakes and good tires. headers, high flow cats, x -pipe, cold air.N/A . 93 octane. I know I'm tame compared to you guys. that's why ask the pro's. I recall my ls6 was like at 12.8 to 13.4 @ wot I think? you guys help jump start my learning and I really appreciate it.

Rhino79 · 03-25-2018, 11:41 PM

14.7 cruise and 12.7-13.0 wot.

eLeSthree · 03-26-2018, 09:52 AM

I found 12.3 made more power na than 12.5 in 4th gear on dyno, but 12.5 feels faster on the street. On the supercharged setup my tuner shoots for 11.3:1 but lets it climb a tad leaner towards redline. Close to 12:1. 93 octane.

GONIF · 03-26-2018, 01:17 PM

14.7 to one is stoichiometric and is not optimal for power , but good for emissions and the engine will run smooth . You want a to datalog it using the fuel you will be using. Somewhere around 12.8 to 1 to 13.2 to 1 is about right for power .Check with your tuner for the best air to fuel ratio .

oldman14ss · 03-27-2018, 08:06 PM

thanks guys, you're the best!

1JEWLDSSRS · 03-28-2018, 02:48 PM

I have a 2011 SS L99 with LT's, VMAX ported TB, off road mids and an xpipe and according to my gauges at cruise I am showing 14.69 and at WOT I am showing 12.33 and this is what my tuner has tuned in the car at WOT. I put down 365rwhp and 371rwtq and she is a beast on the street, and fun..

christianchevell · 03-29-2018, 07:41 AM

I'm with Rhino mines about 12.7 WOT and up.

03-25-2018, 11:13 AM	#1
oldman14ss Drives: 2014 1ss camaro Join Date: Jul 2017 Location: missouri Posts: 705	air / fuel ratio air fuel optimum is 14 to 7 correct? at wide open throttle what are you guys opinion on an AFR for a highway car ? I kinda need to be conservative for I will possibly driving high speed at extended duration not a 1/4 at a time but possibly 40 miles at a time and not want to lean out the dreaded number 7 cylinder.

03-25-2018, 11:57 AM	#3
frankwjr Drives: 2010 SS 2SS M6 Join Date: Aug 2016 Location: Smithsburg, Md. Posts: 2,445	high speed or high rpm? big diff so unless ur on the salt flats IMHO ur good to go...peace btw - I would be more concerned with tires....just sayin. and of course the brakes up to snuff too...lol __________________ 2010 SS 2SS M6 - Tune by RDP dynoSteve!(Woot) - Daily Driver - *150K!* - All work by me...

03-25-2018, 03:13 PM	#5
07-SRT Drives: 2015 Camaro SS Join Date: Sep 2011 Location: Jacksonville, Fl Posts: 713	Is the car N/A ? If so 12.2 to 12.5 at Wot is safe. __________________ 2015 Camaro 2SS Cam/Heads/FBO 498/447 SAE

03-25-2018, 05:17 PM	#6
Pro-tuned Angewendet Ingenieur Drives: 14 Camaro ZL1 Join Date: Apr 2015 Location: USA Posts: 401	[QUOTE= not want to lean out the dreaded number 7 cylinder.[/QUOTE] This is a discussion for the tuner and depends on your setup and goals. Some engines like more fuel some less. As an example; for boosted applications to avoid knock the tuner can reduce timing, increase fuel, or reduce boost. The trick is to optimize all three areas and complete these adjustments in segments and finally smooth out transitions. __________________ ———— LQ9, Iron Block, Forged internals, 408CI, Jannetty custom cam, TS short block, Whipple, Hardened Jackshaft, PRC 260, 2X3 Dynatech Full Competition, HF Cats, CAI, NW 103, Chee, ID 1300, COPO Breather, MSD, Fore Dual Pump, ultratorque, E85, dual Meth, True Trac, 3:45, 1500hp axle-shafts, DSS CF, BMR, custom Pearl/Candy paint by Jaidah.

03-26-2018, 09:52 AM	#9
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,905	I found 12.3 made more power na than 12.5 in 4th gear on dyno, but 12.5 feels faster on the street. On the supercharged setup my tuner shoots for 11.3:1 but lets it climb a tad leaner towards redline. Close to 12:1. 93 octane. __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

03-25-2018, 11:15 AM	#2
oldman14ss Drives: 2014 1ss camaro Join Date: Jul 2017 Location: missouri Posts: 705	oops meant to say thank you ahead of time, gonna turn 60 in august and I got a bucket list going. thanks the oldman....

03-25-2018, 12:32 PM	#4
DSMer1 Drives: 14 and 15 SS's Join Date: Feb 2018 Location: Minneapolis, Minnesota Posts: 387	What mods are done to the car? What fuel? It is easier to use Lambda scale, that way it dosen't matter what fuel we are talking about.

03-25-2018, 07:10 PM	#7
oldman14ss Drives: 2014 1ss camaro Join Date: Jul 2017 Location: missouri Posts: 705	high speed, I have good brakes and good tires. headers, high flow cats, x -pipe, cold air.N/A . 93 octane. I know I'm tame compared to you guys. that's why ask the pro's. I recall my ls6 was like at 12.8 to 13.4 @ wot I think? you guys help jump start my learning and I really appreciate it.

03-25-2018, 11:41 PM	#8
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	14.7 cruise and 12.7-13.0 wot.

03-26-2018, 01:17 PM	#10
GONIF Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014 Location: The Left lane PHOENIX AZ Posts: 2,626	14.7 to one is stoichiometric and is not optimal for power , but good for emissions and the engine will run smooth . You want a to datalog it using the fuel you will be using. Somewhere around 12.8 to 1 to 13.2 to 1 is about right for power .Check with your tuner for the best air to fuel ratio . __________________ OLD GUY FLYING FAST AND LOW Last edited by GONIF; 03-26-2018 at 03:37 PM.

03-27-2018, 08:06 PM	#11
oldman14ss Drives: 2014 1ss camaro Join Date: Jul 2017 Location: missouri Posts: 705	thanks guys, you're the best!

03-28-2018, 02:48 PM	#12
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,485	I have a 2011 SS L99 with LT's, VMAX ported TB, off road mids and an xpipe and according to my gauges at cruise I am showing 14.69 and at WOT I am showing 12.33 and this is what my tuner has tuned in the car at WOT. I put down 365rwhp and 371rwtq and she is a beast on the street, and fun.. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

03-29-2018, 07:41 AM	#13
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,587 View My Garage	I'm with Rhino mines about 12.7 WOT and up. __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop