basically as the title says I want to focus on getting some power out of my 2.9 in my colorado... if possible. my truck really is a dog and doesnt get out of its own way very easily, lousy MPG's to. So can I get any where with this 2.9? I only have a bored throttle body. What if i did a header, cai, a tune, maybe other bolt ons? Do you guys think it would be worth it? Or should I focus funds and effort to a turbo set up? all input is much appreciated!
crg616
All I know is if a man could build a 200+ mph truck out of a 4 cylinder then it can definitely be done lol. Do the bolt ons, that's your best bet then get it tuned
Anything you can do to free up the exhaust system will help. Header, & cat back.
After that if you want power out of the atlas, the cylinder head needs the exhaust ports done. GM purposely restricted the exh port and used the VVT to avoid installing an EGR system.
In stock form the 2.9/3.7 exhaust port flow flat lines at 160cfm @ 0.5" lift (155cfm at 0.35" lift, with the knee in the curve occuring at only 0.15" valve lift with 140 cfm). Once ported the head flows really well (210 cfm at 0.35" valve lift).
The 2.8/3.5 is worse - how much - no one I know of has flowed the early head. But the exhaust port is really small compared to the 2.9/3.7 head.
I know this isn't a bolt on but it is where the powers choked up in the engine. The comp eliminator racers run the 2.9 and make darn close to 500 HP - naturally aspirated. Agreed this isn't an engine that would power a truck very far but it shows the potential.
After that if you want power out of the atlas, the cylinder head needs the exhaust ports done. GM purposely restricted the exh port and used the VVT to avoid installing an EGR system.
In stock form the 2.9/3.7 exhaust port flow flat lines at 160cfm @ 0.5" lift (155cfm at 0.35" lift, with the knee in the curve occuring at only 0.15" valve lift with 140 cfm). Once ported the head flows really well (210 cfm at 0.35" valve lift).
The 2.8/3.5 is worse - how much - no one I know of has flowed the early head. But the exhaust port is really small compared to the 2.9/3.7 head.
I know this isn't a bolt on but it is where the powers choked up in the engine. The comp eliminator racers run the 2.9 and make darn close to 500 HP - naturally aspirated. Agreed this isn't an engine that would power a truck very far but it shows the potential.
Yep yep - Opened the exhaust ports up when I did the primary cat delete - lots of excess material there. Enlarged and smoothed to match up with exhaust manifold.
if i can break my 33" loose with a 2.9 5spd.. you should be able to get some power out of yours too buddy..
ive smoked a few 350 trucks haha they are super slow ! kept up with a GTP grand prix too..
ive smoked a few 350 trucks haha they are super slow ! kept up with a GTP grand prix too..
just drop in KN . custom intake tube, MBRP catback exhaust, and a custom tune... with a stage 2 spec clutch.. i think thats all.. who knows .. honestly ive forgotten half the shit ive done to it the last 5years.
wow is this a 4 year old post....
I just got my 2.9 worked on. Supermod PTB, Supermod tune, secondary air-injection system delete, primary cat-delete with a highflow muffler dumped before the rear axel.
After having Supermod get his hands on my truck it drives way better. With some spirited driving I am averaging ~20 MPG. That's a big difference from the 13MPG I was getting before.
I also feel the power increase. Nothing drastic like forced induction but it is a great improvement. I now to get figure out how to stop the wheel hop.
If your wanting more than the 200ish HP then either look into forced induction or a v8 swap.
I just got my 2.9 worked on. Supermod PTB, Supermod tune, secondary air-injection system delete, primary cat-delete with a highflow muffler dumped before the rear axel.
After having Supermod get his hands on my truck it drives way better. With some spirited driving I am averaging ~20 MPG. That's a big difference from the 13MPG I was getting before.
I also feel the power increase. Nothing drastic like forced induction but it is a great improvement. I now to get figure out how to stop the wheel hop.
If your wanting more than the 200ish HP then either look into forced induction or a v8 swap.
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