tuning for mpg

[skneeland]

i was wondering if i could get some pointers to tune my wifes 2003 trailblazer for a little better mileage please.

i just finished tuning a friends LBZ and there was some nice info on the diesel pages ie; change this value to that, that value to this etc. ;)
after doing some searching for this engine all i could find was alot of vague references to "play with this", or "adjust that" & not really anything concrete

right now its stock except for a K&N filter, but i would like to delete the cat and put in a free flowing muffler. we run 87 all the time and cant see myself paying more for 91.

ive attached the stock tune file. any tips are appreciated, thanks.

[ScarabEpic22]

Hey man, Ill look and see if I can tweak your tune a little, Im still playing heavily with the engine section on my 02 but have the trans shifting how I want. Do you want me to mess with the trans for ya?

Id be happy to help you and get you the spark and VE tables Im using, however I dont really care about mileage and have them setup for max performance. Still get 21mpg on the hwy at 75 though, 24-24.5 @ 65.

[skneeland]

any kind of input, especially field tested settings is great
mostly looking for some solid values to change that have worked for others.
i wont get a chance to test drive the TB much, so i dont want to mess with things by trial an error if i dont have to.

so far, i "think" i want to:
1 change settings so a cat delete wont set a MIL(which ones?)
2 reduce/eliminate Torque management (from what i can see theres 2 tables i can accomplish this from the engine controls{B2003},{B2004}, then a list of settings on the transmission side{D0801,2,3}, {D2004}, (D1116}?)
3 do i want to mess with timing when running 87 octane? which table? how much?
4 transmission abuse mode, mess with it?, what settings?
5 increase transmission pressures, 10%? 20%? {D0701,2,3}
6 shorten shift times {D1108,9,10}, change all that are >0 to 0.10?

*mostly for the transmission, i still want it to be civilized and not kick the rear end sideways on every shift since it is my wifes ride, but a little more S.O.T.P. feel when you floor it would be nice.*

7 DFCO, what to set values at for best MPG gain? (just when i think i understand it, i look at what someone else has set theirs at, then im back to square one)
8 set {B2100} to 1 so EGR never kicks in?
10 someday play with the cam settings when i know more about it
11 anything else i probably overlooked?

[ScarabEpic22]

OK man, Im doing some fam stuff today but started fixing your tune last night and will finish it up tonight. Leaving 15% TM in the trans and lowering the shift times, upping the LPs a little, removing the limiters, and then I need to do the spark and VE stuff.

[skneeland]

sweet, thanks for the help.
ill be away until after the new year, hopefully i can get back at it on the 2nd

[skneeland]

here is what i have come up with so far.
let me know if i missed anything based on my parameters above, or anything that could be improved on.

has:
-some minor timing mods
-egr disabled
-MIL turned off for cat. delete & egr
-tq management allmost zero
-DFCO settings changed
-5% increase to trans. pressures
-shortened shift times

questions should i set {D1997} to zero so that tq managment never kicks in?

[ExtTB]

I disable my a/c around 2700-3000 but it is very flat in florida...gives nice accel boost

[N0DIH]

I do similar on my 94 LT1, I disable AC with more than 50% throttle applied..... I tried to see if I could do it with around 25% throttle, which was ok in the summer until I got into heavy traffic, then I found I was without AC way too much... :) right around 50% is a nice amount and hardly ever noticable, and my wife never complained one bit...

[quicksilverado]

here is what i have come up with so far.
let me know if i missed anything based on my parameters above, or anything that could be improved on.

has:
-some minor timing mods
-egr disabled
-MIL turned off for cat. delete & egr
-tq management allmost zero
-DFCO settings changed
-5% increase to trans. pressures
-shortened shift times

questions should i set {D1997} to zero so that tq managment never kicks in?

Would this file work for a 02 trailblazer?

[ScarabEpic22]

It will be an OK starting point, I know my tune has been completely rewritten from the ground up since Dec. 07. Maybe 2x, I wasnt happy with the smoothness of it so I went back to scratch and started over.

Post your stock tune up, Ill make a few changes like I did above that will give you a good starting point.

[quicksilverado]

It will be an OK starting point, I know my tune has been completely rewritten from the ground up since Dec. 07. Maybe 2x, I wasnt happy with the smoothness of it so I went back to scratch and started over.

Post your stock tune up, Ill make a few changes like I did above that will give you a good starting point.

I will get the tune posted up later today. Thanks.

[Cablebandit]

here is Quicksilverados tune file to be edited. When finished modifying it you can email it to me at cablebandit@comcastDOTnet

http://mssftw.com/files/daves-stock-trailblazer_no-tq-mngmt-timing.tun

[quicksilverado]

here is Quicksilverados tune file to be edited. When finished modifying it you can email it to me at cablebandit@comcastDOTnet

http://mssftw.com/files/daves-stock-trailblazer_no-tq-mngmt-timing.tun

Thanks for the help Jerry.

[ScarabEpic22]

Ill work on it either tomorrow or friday, school's crazy thru tonight as its the week before midterms (with a c++ and java program plus a test) this week.

[quicksilverado]

Thanks Erik.

[quicksilverado]

How did your tests go Erik?

[ScarabEpic22]

Alright, Ive got 3 or 4 people asking me to look at their tunes right now. Got a little behind keeping up with this stuff with school work, spending ~30hrs a week in the lab on 1 program.

[quicksilverado]

Any time to look at the tunes yet?

[ScarabEpic22]

Will in a few days, sorry man, but life's been hectic and I do this for fun not a business right now.

I know we all want the best tune for our trucks, but it takes time and patience (something I ran out of the last few days tuning my TBSS...)

[quicksilverado]

No problem Erik. Take care of business first.

[ScarabEpic22]

You have mail!

Make sure you log and check for knock in this tune, the spark tables are rough and are a general guideline of what they should be. But it will definitely shift better and feel a lot stronger now!

[quicksilverado]

Got the tune Erik. I will get it loaded and do some logging. I really appreciate your help.