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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???? :bow:
that run was made with 35s and 20s too!!
I wouldnt go any higher than that....thats at the limit now!
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?:doofus:
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 .
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
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" .Quote:
Originally Posted by atruck
DFCO , when you let off will show way lean because the engine becomes a air pump at that point .
haha my gauge just blanks out when i get off the gas..80 is about the last number i see...but just cruising i have mine at 14.1-14.9...wot is 12.5-12.8 and on the shot im 11.5-11.7
What is your setup? That is a pretty strong output for those bigass tires. Of course I don't put much stock in dyno #'s.Quote:
Originally Posted by Mr.Blister007
You FI?Quote:
Originally Posted by atruck
i hope he's not FI or NA or sprayed with that AFR...anything under 11 is kind of bad IMOQuote:
Originally Posted by SCIV
I was wondering why it was so rich??Quote:
Originally Posted by mean05
yeah I'm FI. I sent wheatley a log and explained to him what my guage was reading he's sending me a reflashed pcm. So maybe it'll run better.Quote:
Originally Posted by SCIV
the set up right now now is machined heads, comp 222/226 cam, vette servo, ported tb, cold air(with out cam useless), single chamber flowmasters, and no cats. 4l80E, with semi float 14 bolt and detroit locker! it suprised everybody on the dyno including me cuss i though it was gonna be around 340ish? but i guess every motor pulls a little different? i think it had alot to do with the heads. when i was talking to virgil i forgot to add in the heads part but its been so long that i didn't think anything of it cuss it was the first thing i did!
next is a yank 3000 stall and a 100 shot cuss im not trying to blow this thing apart unless you think the motor will hold more. i got new head bolts and all?