Hope I dont get beat down for this one,

[lotsofmiles]

i thought i was doing damn good with 24 on my rclb...besides meth inj. is there anything else your doing?

Im not sure how long imma stay on this PPE since all three trucks need a tune, our LMM is sucking diesel like my tractor does only 17.1mpg

the truck has:
Banks 6gun w/pda, intake and super scoop, cat delete pipe into banks monster single exhaust, egr blocked, tonneao cover, michelin ltx tires kept at 80 psi all the time, and synthetic fluids everywhere. trucks is 2wd. And some toys inside

getting efi soon for the van and I'm hoping it will let me fine tune a few more mpgs out if the truck

on edit: howes power kleaner in every tank too. I think thats everything

 

[Big Block 88]

Jeff's truck yes. it was a 06? lbz. rc/lb. i think it was more to mid 40's

Wow I forgot it was Jeff's truck I guess I nevr put 2 and 2 together. 40 is till badass. I ended up finding that issue in my hooche, Duramax took all the top spots for economy.

 

[Big Block 88]

sorry this was a duplicate post my bad don't know how I did it. If there is a mod or admin kind enough to delete this it would be great thanks.

 

[lotsofmiles]

I looked into CNG before going with the meth. I didnt do CNG this time because start up cost were going to be higher, the one local station I know of stopped selling CNG, a home refilling station was going to add to the startup costs, getting it while out on road trips was going to take some effort, and the when I installed the meth kit I already had over 100,000 on the truck.

I really like the benefits I saw with CNG, and I might do it next time

 

[LBZ]

2wd definetly will help with the better mileage.
My 4wd ccsb lifted heavy tank has gotten a best of 21 cruising at 65-70mph.

Driving to California last May, I traveled at an average of 80-90mph and netted around 17.5mpg which I thought was pretty good.

 

[JD4440]

pretty sure Jeffs mileage was 48mpg. sucks to be reading this getting 16 mpg

 

[Big Block 88]

I am happy with my 20-23 on the highway and 10-16 in the city, my city varies alot though, depending how heavy my foot feels. Lotsofmiles is just tryin to make us all feel bad. Lets beat him down


























J/K:hug:

 

[lotsofmiles]

I cant just duck behind a tree and hide from you, I'd get stuck in my 2wd

 

[lotsofmiles]

open the vanes up, and cruise at 59 MPH.......I've netted 26.5 MPG hand calculated in the summer doing this.

Just to clarify, I didn't zero out all the vane tables. I cruised down the road, observed fuel mainrate at different speeds and noticed that it generally doesn't go above 35mm^3 once you are up to speed and if you drive easy, this is in Michigan where there aren't any hills . So I kept lowering vane position until no boost was achieved cruising. Tha vanes position taper back up once mainrate goes above 40MM^3 and rpm above 2000. This has worked good for me so far, and when you get on it there isn't much lag in spool-up of the turbo.

Ok, I've been working a little on this tune. Ran one trip back from PA and noticed at many times I was only getting .8 - .9 boost. So I found where that was happening and fixed it (I cant get the meth to start shooting in until 1psi). Drove it 450 miles and stayed above 1/2 tank, but didnt stop for fuel. The next trip I drove about 450 miles, 200 of it with a 3400lb trailer 250 without, 95% of the miles were at the posted speed limits (65-70) 5% city driving. on that 450 miles I averaged 18.3mpg. I think I'm in the right area on the tune.

? is this: are you saying lower the target vane position for everything under 2000 rpm?

I lowered the vane position at idle, just for sound but left it alone above 1000 rpms. and I lowered desired boost so that on the eway its running about 1psi.
Pretty much targeted anything under 2000 rpms because at 70ish its hitting about 1750rpms

Running up north of Toronto this week should be a good test run for the tune.

Thanks

 

[Dozerboy]

Target vane position is just a reference # it doesn't really do anything. Maybe I'm wrong. You need to drop desired boost I dropped mine all the way to 55mm3 to around 2 PSI. I hit 55mm3 with al little bit of a head wind. Add some timing 20mm3-55mm3 ~8* works best for me so far. After I get an idea about timing I'm going to jack up the fuel PSI too.

 

[jc64]

With the lowered boost levels at hiway/eway speeds, what are your EGT's? Higher, lower, same,?

jc

 

[lotsofmiles]

its real close but seems like the egts are a little higher. within 100 or so.

 

[Dozerboy]

I don't even know if mind are that much different at 2PSI. IIRC I cruse at about 650* where I do most of the time.


Feel free to add some fuel to in that area. More power will help you keep your RPMs lower. It won't matter so much a cruising on flat ground but accelerating and climbing hills it will help.

 

[lotsofmiles]

I've got a little bug in my tune.

truck is lbz with egr blocked, finger stick, and banks 6 gun. no codes, everything works together good.

I add my efi mpg tune with egr disabled and if I turn on the 6gun pda moniter on stock setting within the first 30 minutes or so and it throws a 'tuner fault' and keeps buzzing at me. check the diagnosis and it says egr circuit low voltage or something like that. check the obdii code and there is a constant maf low voltage code, no cel just a stored code. leave it off for 30 minutes or so get the truck warmed up and then turn it on and its fine

so I'm thinking I need to put all the egr stuff back to stock on my mpg tune?


on a side note.... I'm not comfortable enough yet with my mpg tune to use it when towing more than a few thousand pounds. so i made a stock tune with the vanes open at idle (because i like the rumble). i run this tune with the 6 gun and no codes or tuner faults.

 

[Dozerboy]

so I'm thinking I need to put all the egr stuff back to stock on my mpg tune?

You can do that, but I wouldn't. I would just leave it off until your warmed up keep that intake clean. How did you disable the EGR? Maybe there is a way you can do it and not set off the PDA.

 

[lotsofmiles]

You can do that, but I wouldn't. I would just leave it off until your warmed up keep that intake clean. How did you disable the EGR? Maybe there is a way you can do it and not set off the PDA.

truck has blocker plate and finger stick. just something about the stick and efi started throwing the maf code and egr circuit tuner fault.

 

[Jasondt2001]

it 'sounds' like (I'm assuming here, and you know what happens when you do that. ) the EGR is commanding nothing and the finger stick is telling it it's getting flow?


I'd try taking out the fingerstick seeing what happens then... I wouldn't change the tuning though until you figure out if the finger stick is the issue...

Here's a screen shot of the way I have my EGR tuned out - I have no plate or stick, just tuning...
With it set like this I've never seen it command any EGR in any of my logs.
I also have set nothing else regarding a CEL code or anything in the other tables for the error reporting.
(07 LBZ Auto Dually)

Edit - Just click on the attached thumbnail, I embedded it and it was H U G E ...

 

[lotsofmiles]

[/COLOR]

it 'sounds' like (I'm assuming here, and you know what happens when you do that. ) the EGR is commanding nothing and the finger stick is telling it it's getting flow?
Yea, thats what I'm thinking

I'd try taking out the fingerstick seeing what happens then... I wouldn't change the tuning though until you figure out if the finger stick is the issue...

Oops, already changed the egr settings back to stock and reloaded the tune. I've only noticed the "tuner fault" and maf code if I turned the 6gun on and the engine was cold. I put the tune on with the engine at operating temp, drove it 100 miles back home all was fine. Haven't driven the truck again yet.

Here's a screen shot of the way I have my EGR tuned out - I have no plate or stick, just tuning...
With it set like this I've never seen it command any EGR in any of my logs.
I also have set nothing else regarding a CEL code or anything in the other tables for the error reporting.
(07 LBZ Auto Dually)

Edit - Just click on the attached thumbnail, I embedded it and it was H U G E ...

Thanks.

I'm going to log it next time I drive it a see what its doing. Now if I could only figure out logging:rofl:

 

[Dozerboy]

What are you having trouble with on logging? Have you down loaded the EFI Scan and Tune program?

 

[lotsofmiles]

Yea, I got the scan tool just dont remember how to get things like desired boost, throttle position, etc...

Lets see if I can post one. I logged just a little around town driving.

next time I'm on the highway, I'll log a bit see what its doing