Hey guys, is there any way to run leaner then 14.7 in closed loop to aid in fuel mileage? Mine actually seems to run more around 14.2-14.4 and I know it's hurting mileage. This is on a 2004 gmc with SD tune.
Thanks!
Hey guys, is there any way to run leaner then 14.7 in closed loop to aid in fuel mileage? Mine actually seems to run more around 14.2-14.4 and I know it's hurting mileage. This is on a 2004 gmc with SD tune.
Thanks!
2004 GMC RST: 4.8L/Turbo/E85: 617HP/623TQ
http://www.youtube.com/watch?v=V9nRm6vZl_I
91 Eagle Talon 2.0L/Turbo/E85-10.61@136, 570AWHP Mustang Dyno
http://www.youtube.com/watch?v=yB9kDxXRLgw
e85 is 9.7 not 14.7
2000 Firebird,2002 O.S.,LQ4 370,Borg Warner S475,truck mani.,Eagle crank,Callies Compstar Rods,Wiseco-11 4.030 pistons 9.4:1 comp.,LS3CNC heads,LS3 intake,NW92mm throttle body,ID1000 injectors,BTR trunion upgrade,LJMS STG3 cam,LS7 Lifters,ARP Studs-bolts,Frozen Boost A to W intercooler,JGS 60MM BOV,2 40mmJGS Wastegates,4L80E trans wth segment swap,CircleD 3400 single disk,MOSER 12 3.31gears ,BMR K-Mem.,2 Walboro 450 pumps,Returnstyle fuelsystem MAGNAFUEL regulator.
LS1Tech sig KRAZY K 2000 TA
Yeah same page on that. If I input a higher stoich will it run leaner during close loop?
2004 GMC RST: 4.8L/Turbo/E85: 617HP/623TQ
http://www.youtube.com/watch?v=V9nRm6vZl_I
91 Eagle Talon 2.0L/Turbo/E85-10.61@136, 570AWHP Mustang Dyno
http://www.youtube.com/watch?v=yB9kDxXRLgw
no the trims will put it back to stoich. you can try changing the o2 switch points
My setup is a 356ci with a 260/268 (212/218 at .050 lift) duration cam with aluminium corvette heads and flat top pistons running 11.3 comp. ratio. with tuned port injection and vortec crank pick up and dizzy running a 411 pcm and 60lb bosch injectors, 1.6 ratio roller rockers. For transmission its a 4l65e built with the monster in a box mega ss kit. All in a 92 chevy ext cab 4x4 pickup with a 98 cab now installed with a third door! running only e85
the stock o2's don't know AFR. All it knows is lambda 1.0. Your wideband may read 14.7 on e85 but that is just because your wideband is reporting lambda 1.0 as 14.7 when actually it's more like 9.7:1 afr. Do yourself a favor and learn Lambda! Makes things much much easier.
Now on to your tune, as long as you have your stoich value correct to your fuel type and the tune dialed in you can play with the switchpoints of various airflow modes to obtain a desired wideband reading. Switchpoints are in mV and the higher the mV reading the richer it is, so to lean it out you would want to lower those numbers.
You can run in open loop with your wideband and adjust the tune to where you want it to stay at and log just the o2 mV readings to see where they stay at at the afr your wanting to achieve.
James Short - [email protected]
Located in Central Kentucky
ShorTuning
2020 Camaro 2SS | BTR 230 | GPI CNC Heads | MSD Intake | Rotofab | 2" LT's | Flex Fuel | 638rwhp / 540rwtq
2002 Camaro | LSX 427 | CID LS7's | Twin GT5088's | Haltech Nexus R5 | RPM TH400
I have never seen E85 run more efficient when you have it running leaner than its true stoich point.
Formerly known as RWTD
Toys: '22 Tesla Model S Plaid / '20 Chevy Duramax / ?20 Sea-Doo RXT-X (2)