just got done fine tuning on the dyno "i think"? the fuel air ratio is dead at 13.01 throughout the entire rpm range. could it be leaned any more with out hurting the motor? or should it be richer? give me your opinion!!!!!! i will be putting up the dyno chart in a bit! people seem to think my numbers are crazy for cam only and bolt ons 398rwhp and 434 rwtq????
that run was made with 35s and 20s too!!
I wouldnt go any higher than that....thats at the limit now!
Vortec Performance Tuned
LQ9 built 4L60 LTs and a billion miles on the speedo!
can i knock it down to about 12.8 with a degree or to on timing? and the stock plugs are in it now and i just picked up some ngk tr55's will that help?
14.7 is stoicametric ratio greater than that is lean and less than is rich so you are still running a bit rich, you could lean it out more in the load cells that you normaly cruise in and keep it rich in the high load cells
ok well my next question is will it hurt the performance of the motor long term?
12.5 to 13.2 is good for WOT PE mode , 4000 rpm to max rpm on a Naturally Aspirated engine .
Some engines like 12.5 some 13.0 , all depends , get on the Dyno and see which one makes the most power for your engine , 12.5 - 13.0 .
Like blander66 said idle to part throttle at 13.0 is rich , but maybe your setup likes that AFR .
Being rich does not hurt as much as being to lean , but neither is good .
Now what is a tune again?
Comp Cam 54-412-11 , Int:265, 212, .522 , Exh: 271, 218, .529 , LSA 114 , Longtube , CAI (Vararam) , TransGo HD2 shift kit , tuned by me with EFILive
At WOT I would not go over 12.8 really for me 12.5 is SAFE but 13+ is way too lean IMO get it to 12.1-12.2 for added security the extra fuel will give you more torque on the top end and help with detonation or knock retard. 14.5-14.7 is what the truck will be looking for under normal throttle and at idle. Now for nitrous you need to be much richer at WOT but thats a whole different discussion
2007 SRT8 Jeep Grand Cherokee
damn after reading this I think i'm running to lean then when driving between 1500rpm and 2300 i'm reading anywhere from 14.0 to 15.9 on the wideband. when wot I'm at 10.5 or 10.6 but when I get off of it completely after wot I go lean big time like 17. and i get a lean message from the plx gauge.
You will bounce AFR when driving normally , if in Closed Loop , O2s oscillate to try and keep stoich , I cruse at 15.4 (OLSD) and you can go as high as 16.1 if in low load cruse cells , kind of like "Lean Cruise" .Originally Posted by atruck
DFCO , when you let off will show way lean because the engine becomes a air pump at that point .
Now what is a tune again?
Comp Cam 54-412-11 , Int:265, 212, .522 , Exh: 271, 218, .529 , LSA 114 , Longtube , CAI (Vararam) , TransGo HD2 shift kit , tuned by me with EFILive
Posting Permissions
Reply With Quote