the cobb stage 1 map is butt, that's why. it's hardly a performance tune. i've posted comparison numbers here and on the cobb site.

i'm not sure why you're getting such lean afrs with it though. i ran richer than i'd like with it. 11s and 12s.

if you want a personalized maf scale, you'l want to use kane's baseline unless you're crazy good at math.

the maf scale i have posted here is close to stock, you're right. but it's conservatively different in the right direction.
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i suspect there is something else awry if you're getting 17s at wot. are you sure that's the case? i mean, i've seen numbers like that when i let off the gas. i've seen 20s. the important thing is at what load. at max load, you shouldn't be that high. 14s at the most.

 

yep, it's a consistent 16.5-17.5 when I floor it in 2nd or 3rd gear as I go over ~7,000rpm

the engine note even changes.

everywhere else it's good though in the 12-13's while WOT

i'll try your fuel map next, are you using that same map for the fuel maps for 1-2 and 3-4?

 

check your hoses and caps and your pms. i just sent you one.

 

Maybe an injector issue..... everything set up mechanically?

 

yeah, i stil run this tune a lot. it's my default. works like a champ. old faithful, i call it.

mine is for 1-3 though. 07 is different. but that shouldn't matter. just more work for you.

i've been meaning to ve tune but have been unexpectedly busy as of late.

 

i know what it is. one of his valves isn't opening. or the fuel pump is toast.

 

hmm, dunno about that. APV or VDI? How do I check these guys without being too invasive? And fuel pump? I can see why that would cause leaning such as this, but it's only got 29k miles on it. Also, that "engine note" change that happens when it leans out did not happen Stock.. though I guess that isn't the point..

what should I do here? i was thinking of loading the Cobb "stock tune" and see where that puts me.

and just reiterating this lean situation only happens at WOT.... on the other hand I can apply 50% throttle and go all the way up to redline with my AFR's staying below ~12.5.

 

A fuel pump failure would show itself as really extreme air/fuel readouts...like 19:1 or 22:1. The other tell tale sign is maxing out your positive fuel trims.

It sounds more like it's an issue with the tune itself. Are you using the COBB stage 1 tune when this happens? People have reported the tune is very lean and I've had lean issues when I used it myself. I would advise staying far away from it. The tune doesn't have any updates for OMP, fan speeds, idle speed or redline anyway...lame.

I would load the stock tune and see if you can repeat the same values. If you see much richer air/fuel readings then it's clearly the tune. If they stay the same I'd investigate a possible vaccum leak.

 

okay, so something outside the tune is making me run leaner then I am supposed too.

just so you guys can see, here are 2 quick data logs of the 17's afr's I was getting with the Cobb Stage 1 stock map. these are quick pulls in 2nd gear, wot.

http://implux.net/~alz0rz/2ndgear1.csv
http://implux.net/~alz0rz/2ndgear2.csv

so i loaded the cobb stock style map. now in the afr tables for this map they have the AFR targets in the mid 10's and low 11's... it looks like I am running leaner then I am supposed to though at WOT, check out 2 logs I made with the stock style map.

http://implux.net/~alz0rz/cssm-1.csv - this one is 2nd to 3rd gear hard pull.
http://implux.net/~alz0rz/cssm-2.csv - this is a 2nd gear only pull.

the only thing I noticed was I logged a few times over 230g/s which I found interesting...

 

that makes no sense. your stock numbers are a little lean, but your stage one numbers are really lean. weird.

do a bunch of puls and let's see how consistent things are.

look how little difference there is between stock and stage one 2nd gear wot (with ms intake).

 

your "stock" was the cobb stock style map yes?

i'm thinking it really has to do with my MAF needing to be scaled.. i'll run this tune for another day or so since the numbers are much safer... hell I'd even be tempted to leave it as is.. but something is wrong and i want to know what it is.

 

I'm thinking it is time to MAF scale...... a little can go a long way.

 

i'd love to but I'd need help setting up Baseline .... i tried and didn't want to mess with it.

 

Can come visit me in VA when I get there I guess..... haha u have to make the drive though!

 

where in VA are ya gonna be? I may just do that, i've been looking for an excuse for a road trip :P

 

Fort Eustis

 

400 miles, not too bad.

 

f**k - that's like the other end of the country here LOL .

Just to be clear here - you fitted a ms intake and since then you are lean above 6000 at WOT ?

 

/\ no I had no way of measuring that beforehand.. I had an MS intake on the car for the longest, but just recently got my AP to play with. So after loading the Cobb stage 1 map my AFR's were extremelyyy lean.

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Any so an update.

After a good number of driving cycles with the Cobb "Stock Style" tune my AFR's seem to have richened up. I am now in the 11's at WOT. I guess that makes sense that after my trims have settled I will be more of where I am supposed to be?

So i have edited the stock style map with the fueling and timing that myriad provided, will load the new edited map on tomorrow and see how that goes. I also increased load based omp operation by about 25% in all ranges.

 

You may end with some black smoke; keep an eye on it.

Also watch your fuel trims; if they are really high then you have problems.

 

"Black smoke", too much oiling you mean?
As for my trims, they are spot on.
My STFT deviates from -1 to 2 at idle, usually settles to 0. My LTFT has stuck in the +5 to +8 range.
This is with driving with the Cobb "Stock Style" map for a good week now.

 

5-8 is not too bad (not great)....... I dunno - I guess try the Chase map and see what happens.

 

Hey Kane when you get over here I'm a have you take a look @ my car & maybe we can get this baby fixed & tuned.
I've been having this ongoing idle issue now going on 11mos.

Check my thread here Linky I've done everything & pretty much fed up with this damn car @ the moment.

Jeff seems to think it has something to do with my injector scaling.
I sent all my injectors off for cleaning & flow testing and everything came back fine. Although the stock yellow injectors do flow more than 380cc (440cc to be precise).

Well after I reinstalled all injectors w/new seals, I start her up & after warming up, it proceeds to do the same damn thing. I don't know what to do @ this point, maybe when you get down here, you can help me diagnose to see if it is the tune or some issue w/the car

 

Yep - sure can; I'll be around.... most of my weekends are spent doing stuff like that.

 

And drinking that Sailor Jerry stuff with Coke