2004 6.0 NV4500 Tahoe

[wjburken]

I can take … a … pounding

That’s what @pwtr02ss likes about you.

 

[Dantheman1540]

I'm still on the struggle bus when it comes to tuning this thing, It seems like no matter what I do to the VE table it still has erratic fueling issues. For example when coming to an idle it will first idle at 12.0afr then smooth out to 14.7ish then go super lean and stay lean like 16.5-17 until I touch the throttle or begin to move again in which it restarts the pattern. It reallys throws my histogram data off because despite having 6k hits in the idle cells some of those hits are crazy lean then some rich then some in the middle so what should I base the data off? it even does this with STIT active and I noticed that despite commanded being 14.7 and actual being 14.7 the ST fuel trims are showing -25%. Is that meaning they are seeing its 25% lean? Maybe its the fever or the low IQ but I'm confused.

 

[pwtr02ss]

Hope you feel better soon dude

 

[Dantheman1540]

Finally starting to feel better and I tried to order a new cluster for a buddies 05 2500. Put in the order with Carl and in the confirmation email he sent me he said "Also the 7k tach is not intended for competition or shift points, it’s not that accurate.". Not gonna lie that really ****** me off! I've personally noticed that it seems off up top but I kinda thought it had to do with the fat Esky needles being hard to read moving quickly and my eyes darting from gauges to road and back so quickly. Highly disappointed that this isn't described in the description of the cluster I would have just gotten a 6k cluster for $150 less without the Esky needles. To me this makes the inaccurate 7k tach more useless than a standard accurate 6k. I guess I need to do some real testing to see how much its off and what points is it off at.

 

[Dantheman1540]

Ok who knows about Efan conversions blowing relays? Another fan relay is down and my AC quit last Friday for no reason. It’s doing exactly what it was doing before I changed a bunch of AC setting in the tune but I haven’t touched any of that stuff since so idk wtf!

Also having weird fueling readings with my afr so I’m pulling the passenger header and welding a new bung in front of the awful V band that leaks.

On the plus side I got a shipment of titanium cups to practice welding this week I’m so pumped to try it.

 

[Dantheman1540]

I should add that I swapped efans to the ones from my RCSB thinking maybe the driver side fan was starting to die and drawing more power. Replaced the relay and will see how long it lasts this time.

 

[randeez]

I'm still on the struggle bus when it comes to tuning this thing, It seems like no matter what I do to the VE table it still has erratic fueling issues. For example when coming to an idle it will first idle at 12.0afr then smooth out to 14.7ish then go super lean and stay lean like 16.5-17 until I touch the throttle or begin to move again in which it restarts the pattern. It reallys throws my histogram data off because despite having 6k hits in the idle cells some of those hits are crazy lean then some rich then some in the middle so what should I base the data off? it even does this with STIT active and I noticed that despite commanded being 14.7 and actual being 14.7 the ST fuel trims are showing -25%. Is that meaning they are seeing its 25% lean? Maybe its the fever or the low IQ but I'm confused.

im sure ive asked but make sure the maf is completely disabled, de-pin the connector if you have to. dont go into PE mode, disable fuel cut, reset the fuel trims after every log/tune.

-25% means the tune wants to pull that much fuel out, so youre way rich.

you almost need to just disregard start up and fluke temp swings. try and always tune the VE same outside temp, coolant temp, IATs, no AC

 

[Dantheman1540]

im sure ive asked but make sure the maf is completely disabled, de-pin the connector if you have to. dont go into PE mode, disable fuel cut, reset the fuel trims after every log/tune.

-25% means the tune wants to pull that much fuel out, so youre way rich.

you almost need to just disregard start up and fluke temp swings. try and always tune the VE same outside temp, coolant temp, IATs, no AC

MAF is not De-pined because I haven't fully comited to SD only and I just don't feel like doing it so early in the tuning process.

Don't go into PE you mean disable it or keep throttle% under PE enable?

Fuel cut is disabled, however I feel that during cruise when on and off the gas since its manual the compression braking seems to lean out like crazy possibly throwing off data. I can avoid this by throwing it in neutral anytime I'm coasting but I need it to idle properly first.

I know -25% is crazy rich but I'm not sure its a 100% accurate reading.

Disregard startup meaning the first 5 seconds or the first minute or two?

I really really think a lot of the issues are the exhaust leak, it doesn't sound loud but with my hand up next to it I could feel a considerable amount of leaks at the V band. Should have it solved this week tho.

Do you tune looking at the O2s? if so do you build a histogram?

 

[randeez]

You need to make sure the maf is completely failed when tuning the ve table. They blend for fueling otherwise, so if you pull fuel from ve table the maf going to say you need more. But it doesn't differentiate from which.

Disregard first couple minutes

Exhuast leaks that close to o2 sensors will screw everything up. On decel you get reversion, where is sucks air back in thru the leaks

My wide band is in a 4" pipe so it's not very "accurate" at low flow, I still use the narrow bands for anything under 3000rpm or so

 

[Dantheman1540]

You need to make sure the maf is completely failed when tuning the ve table. They blend for fueling otherwise, so if you pull fuel from ve table the maf going to say you need more. But it doesn't differentiate from which.

Disregard first couple minutes

Exhuast leaks that close to o2 sensors will screw everything up. On decel you get reversion, where is sucks air back in thru the leaks

My wide band is in a 4" pipe so it's not very "accurate" at low flow, I still use the narrow bands for anything under 3000rpm or so

How exactly do you use narrow bands? I've always read that narrow band tuning is trash and for people who can't afford a wideband lol.

 

[pwtr02ss]

How exactly do you use narrow bands? I've always read that narrow band tuning is trash and for people who can't afford a wideband lol.

Now you're asking the real questions that I've been wanting to know!

 

[randeez]

If you're only using your wideband then you shouldn't be looking at the stft and ltft error % cause that's not even what your targeting lol
Set up the same graph but replace the narrow band with the wide band input.
But if the narrow bands are off 25% you're either in PE mode the whole time driving or not targeting stoich, That's all the narrowbands care about. So you when tuning them you need to focus on steady fueling, no start and stops, no hard acceleration, no decel fuel cut.

 

[Dantheman1540]

If you're only using your wideband then you shouldn't be looking at the stft and ltft error % cause that's not even what your targeting lol
Set up the same graph but replace the narrow band with the wide band input.
But if the narrow bands are off 25% you're either in PE mode the whole time driving or not targeting stoich, That's all the narrowbands care about. So you when tuning them you need to focus on steady fueling, no start and stops, no hard acceleration, no decel fuel cut.

Trying to follow along here, I don't have a graph with any narrowband input, I have one with wideband data tho. I should replace the wideband with the "Short Term Fuel Trim Bank 1 or 2" and use it exactly as I would the wideband info by cross referencing the data with the VE table and making adjustments but only in the idle/part throttle cruise areas.

Here's how I set up the graphs. Can't go test because the truck has no exhaust right now.

 

[Dantheman1540]

Since I need to weld that bung in the header to get more accurate readings I might as well pull the entire exhaust off and redo stuff, you know since I'm already there........

So the plan is to ditch the over axle pipe and the two resonator tubes. I have a 3" cutout laying around so I will attempt to cut and weld that into an H-pipe directly before the massive dynapro dual3"/single 4" muffler. I will take the dynapro and attempt to make it quiet by adding silencers to the inlet and outlet port essentially necking them down to dual 2" inlet and single 2.5" outlet. If that doesn't work I will try to fit the old factory replacement FloPro that was super quiet in place of the dynapro but if I can make the dynapro work that would be best since the dynapro inlet is a offset different pattern than the flopro.

 

[pwtr02ss]

Love the 3d auto cad layout

 

[Dantheman1540]

Love the 3d auto cad layout

I'm a professional 8=========D~~~~~~~ o

 

[Fless]

Was gonna say I don't see your usual "pointer" in either of those.

 

[iamdub]

You gave the LOL meme a wicked hairdo, dancing body and an ankle bracelet.

 

[Dantheman1540]

Did a little touch up welding to my mid pipes. The mig welds were okay but looked ugly and were lumpy so I took my tig torch and burned it all smooth with a nice weave pattern. Also welded the new bung in and closed off the old one.

 

[Dantheman1540]

View attachment 368504



You gave the LOL meme a wicked hairdo, dancing body and an ankle bracelet.




View attachment 368503

When I was sitting on the commode last night and saw this on my phone I didn't quite get it. Now that I see it on my laptop I realize its genius and exactly what I would expect from a man with an avatar like you have lol.