Got my Yukon tuned today

So I've owned my Yukon about 4 months now and I did your basic bolt ons some of which people will say are a waste of money, Not here to debate I did what I wanted to my truck and I had some fun doing it "except the broken manifold bolts". Today i got it tuned by Complete Street Performace here in West Chester PA.

Truck is a 09 Yukon SLT with LMG 5.3 with 111k

"Mod list"
S&B cold air intake
Gibson shorty ceramic headers
Magnaflow 12589
SLP resonator delete<---not really a mod but we will put it on the list.

I never got a stock base line dyno.

But initial results before tune were
248hp 281tq

Results after tune were
268hp 291tq

85 degrees

The hp is what it is I'm mostly surprised about how low the tq was.


I'm curious if anyone has similar mods what there dyno results are??

20hp from a tune is pretty good!

Dynos can read differently. Now go on over to Maple Grove and make a trio of passes at least to see what is actually making it to the pavement.

My 2009 is stock save for the Magnaflow Y-Pipe and cats and a BlackBear Tune, she puts out 307 Rear Wheel Horsepower through the traps. A little more would probably be let loose if my KO2 tires weren't stuck to the track.

I don't know how dyno horsepower corresponds with track horsepower.

Give it a few days of driving and you'll see her adjust to the mods and tune, how do you like it so far? I LOVE the way my transmission performs now.

swathdiver said:

Dynos can read differently. Now go on over to Maple Grove and make a trio of passes at least to see what is actually making it to the pavement.

My 2009 is stock save for the Magnaflow Y-Pipe and cats and a BlackBear Tune, she puts out 307 Rear Wheel Horsepower through the traps. A little more would probably be let loose if my KO2 tires weren't stuck to the track.

I don't know how dyno horsepower corresponds with track horsepower.

Give it a few days of driving and you'll see her adjust to the mods and tune, how do you like it so far? I LOVE the way my transmission performs now.

Click to expand...

I'm actually thinking about going to Cecil on Wednesday if the weather is nice. Overall it's much smoother. When it downshift one gear going up hills ot doesny bog and than jump down another gear and take off like a bat put of hell anymore. I still cant do a damn burnout!!!! They said they took all the tq management out but it's still a dog out of the hole for the first 50ft"it does have 20s factory and cooper discovery tires" . But with that being said it's much better than it was, I did a highway pull and it definitely picked some pull up top.

Downshift is alot smoother no more clunking when doing 3-2 -1 shifts. He said he did minor adjustments to trans, He said next summer when I do a cam he will adjust the trans more.

JDopirak said:

I'm actually thinking about going to Cecil on Wednesday if the weather is nice. Overall it's much smoother. When it downshift one gear going up hills ot doesny bog and than jump down another gear and take off like a bat put of hell anymore. I still cant do a damn burnout!!!! They said they took all the tq management out but it's still a dog out of the hole for the first 50ft"it does have 20s factory and cooper discovery tires" . But with that being said it's much better than it was, I did a highway pull and it definitely picked some pull up top.

Downshift is alot smoother no more clunking when doing 3-2 -1 shifts. He said he did minor adjustments to trans, He said next summer when I do a cam he will adjust the trans more.

Click to expand...

Awesome, looking forward to the results. I can spin my KO2s depending on the road surface even with TCS on. More often than not, they stick to the road like flypaper; especially at the drag strip!

I can't even spin my tires when it's wet. It just grips and goes!

Actually, I've never floored it from a dead stop, wet or dry. I've gone about 75-80% throttle though.... Lol

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

They supposedly turned off all of the tq management but it still feels the same when you dead stop and punch it. It hesitates for like 20-40ft than takes off. I thought a tune woukd fix this but I guess not.

I thought torque management took effect between shifts, not from a stop?

Like it pulls timing from the motor during a shift. At least that's what it does on the mustangs I own.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

gooffeyguy said:

I thought torque management took effect between shifts, not from a stop?

Like it pulls timing from the motor during a shift. At least that's what it does on the mustangs I own.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

Click to expand...

Maybe? I know that something reduces power when an amount of throttle is commanded that would put a certain amount of stress on the trans and drivetrain. Maybe the DBW throttle system controls that but the TM programming pulls timing between shifts. Or they both work in unison for both? I'd have to watch my ignition retard and throttle angle response when flooring it from a stop to see.

There is torque management in the ECM and in the TCM if my memory serves me.