What Car Do You Own?

[RAW-Raptor22]

Has the 4.2L straight 6. Enough engine for what I need. 270HP and 275TQ if I remember correctly.

It needs a few things taken care of (typical tune-up, spare tire winch fixed, a little rust on the edges of the doors, and a squeaky window lol) but its in pretty good shape overall. Previous guy had it 7 years, and traded it for another, newer one of the same model, so I figure he can't have had any real issues with it.

Awesome, straight 6s for the win.

Last American Straight 6.

[[XC] Lead Head]

My father has a GMC Envoy, basically the same thing as the Trailblazer but with a better interior. Engine is awesome, plenty of low end torque but loves the high revs. Only major let down IMO is the 4 speed automatic behind it. Its gear ratios are just not suited at all for the 4200.

Also, 02 is 270HP, 03 is 275, 06+ had 291HP.

[RAW-Raptor22]

My father has a GMC Envoy, basically the same thing as the Trailblazer but with a better interior. Engine is awesome, plenty of low end torque but loves the high revs. Only major let down IMO is the 4 speed automatic behind it. Its gear ratios are just not suited at all for the 4200.

Also, 02 is 270HP, 03 is 275, 06+ had 291HP.

Whats the mechanical differences? Can someone just do a ECU flash?

[[XC] Lead Head]

Whats the mechanical differences? Can someone just do a ECU flash?

06+ Have revised pistons and rods. The heads also flow slightly better.

A PCMForless tune will really wake up any Envoy/TB with the 4200. Especially if you request most of the torque management deleted and the shifts firmed up.

[RAW-Raptor22]

06+ Have revised pistons and rods. The heads also flow slightly better.

A PCMForless tune will really wake up any Envoy/TB with the 4200. Especially if you request most of the torque management deleted and the shifts firmed up.

Head. There is one of them, not heads...

Thats awesome, I normally cant stand GM but I wouldnt mind a TB or Envoy or some of the new stuff they have out.

[Sparky]

06+ Have revised pistons and rods. The heads also flow slightly better.

A PCMForless tune will really wake up any Envoy/TB with the 4200. Especially if you request most of the torque management deleted and the shifts firmed up.

I'm planning on a Transgo SK-4L60E shift kit to firm a few things up, particularly with the torque converter lock. These trucks are a little lazy and soft locking it and keeping it locked. I have that kit in my Camaro (same transmission, kind of funny actually) and it made a troublesome TCC lock become very quick and precise, and got an mpg increase from it too. But the tune will also be needed on the trailblazer I think because of the "comfy" stock tuning it has for the trans compared to the little more "aggressive" stock tuning on the Camaro. But we'll see.

[[XC] Lead Head]

The torque management with the electronic throttle on the TB/Envoy is horrible. Even if you mash the pedal to the floor, it will only open the throttle blade about 40% until the engine is over 4000 RPM. Mainly to protect the transmission.

However with the shift kit you could probably have PCMForless do a near full TQ management delete without hurting reliability, especially if you have them firm up the shifts in software too.

Stock these things won't/will barely even chirp the tires if you punch it off the line. People say after the torque management delete they will happily roast the tires off the line without a problem

[RAW-Raptor22]

The torque management with the electronic throttle on the TB/Envoy is horrible. Even if you mash the pedal to the floor, it will only open the throttle blade about 40% until the engine is over 4000 RPM. Mainly to protect the transmission.

However with the shift kit you could probably have PCMForless do a near full TQ management delete without hurting reliability, especially if you have them firm up the shifts in software too.

Stock these things won't/will barely even chirp the tires if you punch it off the line. People say after the torque management delete they will happily roast the tires off the line without a problem

Yea I heard that stock TBs were anemic which didnt make sense when you relize they have 290+ HP...