Since my last question wasnt really pertinent and I was doing well enough already ill hopefully get an answer on this one.

I was looking at my eq Ratio and for some reason (this is stock) I see from the 3000-4000 rpm band PE commands 13.5 - 13ish AFR during WOT which seems awfully lean to me. Is there another variable im not considering?

Just curious what everyone's eq ratio was around and why.

 

i believe thats where mine was even set at with stage 2 at 3000-4000, the enrichment is still ramping up. There may be other enrichment variables like Cat over-temp that may help richen it when needed, but otherwise thats pretty standard, i believe it only matters around 5000-7000 where it needs to get into good richness to help reduce knock, stage 2 still only commanded around 12-12.5 AFR for some reason though.

 

Its below torque peak and generally low EGTs at that engine speed.

 

Yea i was getting the same commanded, however im getting 1-1.5 AFR lower than commanded.

So if my log shows im commanding 12.3 id get something like 11.1 actual.


Lowest commanded on my logs was

11.0 AFR during WOT
4771 RPM
100 MPH
IAT2 144
IAT 91

YET!!!!
12.61 is what the EQ ratio comes up with commanded PE


Why did my PCM command 11.0 when PE ratio states it is 12.61?

*scratches head

1.13672 - 1000 RPM
1.13672 - 2000 RPM
1.13672 - 3000 RPM
1.08789 - 4000 RPM
1.10449 - 5000 RPM
1.17285 - 6000 RPM
1.14160 - 7000 RPM
1.11719 - 8000 RPM

bump for avg eq ratio map

 

DUN DUN DUN CAPTAIN OBVIOUS TO THE RESCUE!

got me, i just wanted to do that.

cot and piston protection are on

 

LMFAO, i had COT disabled but piston protection on.

Safe bet for piston protection would be 5,000?

 

Piston Protection should be fine at that speed.

 

better to se it lower? maybe 4200-4500?

Generally DD i dont go above 3k however i dont want to be wasting fuel for nothing during spirited runs.

 

You shouldn't NEED piston protection in most cases. But it's just a safety thing to dump fuel in when it thinks there might be a danger. It doesn't guarantee anything, but it does have it's effects.

 

gah i hate when i get to this safety vs performance crap in a non-linear fashion.

If i set it to 4,000 during my spirited runs it will kick in and destroy my spirited "performance"

however if i take it off and get the performance, something "could" go wrong and screw up #4 like IATs being through the roof @ high rpms.

There a way to modify piston protection to dump 1/2 the fuel it usually does?


Thanks for the answers btw.


edit:

n/m ill just tune my eq ratio to compensate for the protection.

 

Well, ideally you want your EQ ratio to be as close to your actual ARF as possible.

 

makes things rough when you slap COT and piston protection in to the mix to make you go 1-2 parts more fuel.

 

Well COT is an easy fix. as long as your AFRs are safe and everything else is in line, I don't see the need for piston protection.

 

very true...HOWEVER

(big however)

id rather be "safe" than "oh ****" sorry.

 

Can someone give me an example of their PE eq/ratio. I dont understand why there is a wobble curve during enrichment on the stock scan.

doesnt make sense. Would it be safe just to do a straight line up to commanding 11ish AFR?

 

yes it would be safe to do that and disable piston protection and COT, IF you have your MAF and VE tuned to actually get the commanded afr. I run a ramp in on PE from 12.5 down to 11.4 with no adders. been doing this for about a year now without any problems. IMO the PP and COT just throw inconsistency into the mix and screw up my method of detecting fueling errors.

the COT and PP add to the current PE multiplier table. these adders are not consistent and can add different amounts to the PE table depending on rpm, catalytic converter temperature, etc. this is why the stock PE table is not linear.

 

very well explained, thank you much for the details and testimony

 

np

 

Russ's modded s2 tune

Mind checking on this to make sure nothing is out of whack?

Problem with the tune prior with COT and Piston Protect "enabled" was

RPM Commanded Actual <----reference

3400 , 13.6 , 12.27
3800 , 13.6 , 12.11
4000 , 13.4 , 11.02
4500 , 11.2 , 8.79
5000 , 10.9 , 8.82

was making me

 

im at work right now and dont have hptuners on this pc. i'll look at it later tonight.

but keep this in mind... the stage 2 tune has huge MAF error. thats why it runs so damn rich. what commanded afr = is the total combination of all fueling tables and adders. this includes your PE table, COT, piston protection, etc.

in order to get rid of the discrepancies you need a wideband o2 and either log it with hptuners or somehow be able to correlate what maf readings are associated with each particular AFR reading.
this is something that cant be achieved with any canned tune, because its different for every car.

 

ve and maf are correct, im positive on that since it took 4-5 days of driving to and from work to get them dialed right. (54 miles a day)

trims are +3/-3

AFR reading above was a WOT pull /w COT and piston protection

Unless your saying to lean out my trims to +15 and go back to AFR (which id like to avoid)

 

^ edited ^
ok so you obviously have a wideband and know how to tune for errors.
have you disabled the cot and protection? do that, then dial in your PE table to the values you want to see on your wideband. then go see how far your afr is off.

no... +-3 is good for trims. leave those alone and forget your low portion of the maf (below like 6900hz)

only deal with your higher maf freq for now.

 

Ill post logs when i get home.

I have standard version but its easy to see what im commanding vs my actual AFR when i compare the graphs.

Thanks for the pointers and all your help.

 

If, for some reason you feel you MUST have the protection in there, re-enable them after you get your afr dialed in and then adjust accordingly to the adders.
for now, get that **** outta there

leave it alone for now. i will look at the tune tonight.

no problem dude. just trying to help others as others helped me when i was figuring out this stuff

i also have hpt standard. looking back i wish i had spent the extra for the pro. its hard looking at log files, looking at the w/b gauge, and driving at w0t, and probably a big

 

You have an innovate lc1? or using the aem uego?

Just curious. I keep both logs open during WOT and keep an eye on my AFR gauge to make sure it doesnt lean out. Pretty easy to match up the AFR with AFR commanded by looking at my RPM shifts and the slight lean spike coinciding with it.

I may upgrade later however this will get me dialed in pretty close for the time being.