10-04-2019, 10:08 AM | #1 |
Drives: 2011 2SS Join Date: Mar 2015
Location: Arlington, Texas
Posts: 1,333
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AFR on E85?
Hey everyone, so I recently had my blower/ snout ported and put on a 102mm throttle body along with some other little things and I datalogged the car last night and my AEM wideband was reading just over 9.0 at WOT. I know my tuner likes to keep the car safe, but does that not seem unnecessarily rich? Even for E? I sent my tuner the log so hopefully he can take a look at it and address any changes that need to be made but I just wanted to hear your guys’ input. Thanks!
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2011 SS L99
LSA Supercharger, BTR Stage 3 PDS Cam, Yank 3200SS, Weapon X Stage 2 intake, LSA Heads, Flex Fuel, Ported throttle body, Speed Engineering Headers, NOWEEDS, ZL1 fuel pump, DSX AUX Pump, ID-1050X injectors, 3” pipe to NPP mufflers, 3.91 gears |
10-04-2019, 10:29 AM | #2 |
Drives: 2010 Camaro SS L99 Join Date: May 2019
Location: New Orleans
Posts: 119
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I would have actually expected a little under 9 at WOT, but I'm a noob to this stuff so my input isn't worth much lol
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10-04-2019, 11:05 AM | #3 |
15 Year LS1Tech Member
Drives: 2010 ss 391ci LS3 Join Date: Apr 2017
Location: Albuquerque
Posts: 252
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From what I've seen about 7.6 - 8 under boost and 9.5 cruise/idle is "ideal".
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GJDM |
10-04-2019, 11:13 AM | #4 |
Served USN - Atomic Chimp
Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012
Location: Fort Collins, CO
Posts: 1,603
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I'm sure you're aware that Gasoline stoich is 14.7 and E85 stoich is 9.7. So, obviously, you're going to have a much lower AFR (if you're AEM is only setup with gasoline) when cruising (those stoich) and WOT. I like running lambda because it removes the AFR confusion, so, I like 0.76 which is 7.3 equivalent AFR at WOT with E85. The 9.0 AFR you're getting appears very lean to me.
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In excess of 1,000WHP LSX434 | AGP 65/65 TT | BTR Equalizer Intake | Trickflow 245cc cathedral | BTR custom cam | Cortex EBC | n2mb WOT | ID-1700x | Brisk GR12S | RPM Lv 7 TR6060 | AGP's Triple 525LPH Fore Fuel | Monster LT1-S Triple | 4.11 DSS Proform 9", CF driveshaft, 1400hp axles | Hurst Line Lock | MGW Retro Short Throw w/old skool Hurst T-handle | ADM solid subframe mounts | Prothane Motor Mounts | Revshift Poly Trans insert | Moreno camber/caster plates |
10-04-2019, 11:18 AM | #5 | |
Drives: 2011 2SS Join Date: Mar 2015
Location: Arlington, Texas
Posts: 1,333
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Quote:
I’ll have to take another look at the log this evening. The tuner is a pretty well known guy in SoCal so I’m sure he’ll make it all right if anything’s wrong
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2011 SS L99
LSA Supercharger, BTR Stage 3 PDS Cam, Yank 3200SS, Weapon X Stage 2 intake, LSA Heads, Flex Fuel, Ported throttle body, Speed Engineering Headers, NOWEEDS, ZL1 fuel pump, DSX AUX Pump, ID-1050X injectors, 3” pipe to NPP mufflers, 3.91 gears |
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10-04-2019, 11:43 AM | #6 | |
Angewendet Ingenieur
Drives: 14 Camaro ZL1 Join Date: Apr 2015
Location: USA
Posts: 401
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Quote:
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10-24-2019, 07:43 AM | #7 |
GrINned & JUICEd
Drives: 15STI, 10Expy, 10 2SS/RS M6, 47KB1 Join Date: Nov 2009
Location: Pittsburgh, PA
Posts: 1,247
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"E85" varies at different pumps and times throughout the year. Can be E51 to E85. So the stoichy will change depending on the percentage of ethanol. Thus your afr will change too. Is a flex fuel sensor installed to monitor the amount of ethanol and is it accessible to read? If not, you can pick up a test unit to measure the ethanol percentage when you fill up. They are cheap and easy. You can even do it with a graduated cylinder, used in chem labs. Then calculate the stoichy for that blend. Then multiply that stoichy by .78 to get your afr at wot. Then account for stoichy that is programmed into your afr gauge. Or just use lambda on your wideband. Normal cruising lamda will be about 1. For boosted, it will be roughly .75 to .78. Which AEM do you have? It may have a fixed stoichy for straight gas, that may be the reason for 9.0 afr. If all the values are not known and accounted for, your afr is meaningless. That's why lambda is the best route. Also, if you have no flex fuel sensor, the factory narrow band O2 sensors will try to adjust for the different blends by changing the long term fuel trims, LTFT. Which may cause issues when at wot and open loop. Different blends also will affect the amount timing. Not sure how your tuner tunes and ecm tuning is definitely not a strong point for me. Can you switch your gauge to lambda?
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GPI SS3 Cam & stuff,N.O. Plate(dedicated fuel tank,progressive,fuel hose upgrade,remote opener,heater,console switches),LNC2000,CTAP,ARH 1 7/8" LTs/gutted cats/X pipe/mufflers,Jet Hot coated LTs,GPI HPT Tune,CAI, Scoop,Rx Catch Can,Gates heater hose relocation, Remote clutch & auto brake res,Metco loop,Momentum Tunnel Brace,TSW Nurb 18",555 & 05,Pfadt trailing arms & toe rods,Autometer WB,Fesler Pillar Pod,LED strips (int),Lloyds floor & trunk mats,LED DRL/front turn & license plate,DRL harness,VLEDs tail lights,Plasticoat Bowties. Ord: Oct 5, 2009 Rec: Nov 19, 2009 13.17@112.6 stock
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