HP for street Terrain
 

I purchased a new 2011 Terrain. Great size and comfort. A bit "weak" at cruising speeds. Kicks down going up a grade at 65 or 70. Any suggestions for adding HP without major changes? Air Cleaner stuff?
Thanks
Dick

Re: HP for street Terrain
 

What is a Terrain?
As for the 'air filter stuff", I have seen nothing but more noise and screwed up fuel trims. Gains, if any, would be at WOT and higher RPM. Won't do a thing for what you describe. The systems I have tested on GM trucks, on my chassis dyno, showed zero hp gains. Some will cause lean codes to show up, however. Most make more inlet air noise.

Some computer tuning would help.

Re: HP for street Terrain
 

New mid sized GMC SUV. purchased the V-6 with 6 speed automatic. At 65MPH it kicks down on any grade. I believe 10 or 15 HP would help and help MPG also as you can watch the gauge drop on Highway speed.

Re: HP for street Terrain
 

Dick, I have not tuned any of those new V6 truck engines. We make some pretty fair gains with the 4.8L, 5.3L and larger V8 trucks. My nephew has an inline 6 earlier Trail Blazer that I was able to help enough to stop a lot of that down shifting. It is anoying. A couple MPG is pretty average mileage gains. Sometimes more. Wish I could help you with that V6.

Good luck, Ed

Re: HP for street Terrain
 

Ed , Good suggestions. I will try for a tune up locally. Thanks.

Re: HP for street Terrain
 

Dick,
Although not exactly the same...
I have been working on 604 GM crate engines for about 8 years now and have one permanently strapped to my Superflow chassis dyno.
The biggest easy gain is one of my oil filters if it will take a PF-35 type ( Std Chevy ), with gains in filtration media and oil flow my customers see 5-12 rwhp.

Spark plugs & wires are also a huge gain on almost any computer based engine, I use projected tips to advance the combustion timing and start the fuel burn earlier.

Fuel brand is also a huge gain ( as much as 12rwhp ), I have dyno tested almost every fuel known to man and some are almost as good as VP-MS109 $10Gal.

Fuel pressure is also a significant adjustment and depending on the engine and fuel system hitting the sweet spot is 20-30ft#

Air pressure in the tires is also worth 5-10 rwhp and more is always better as long as ride quality is OK.

I have a customer newsletter I send out with parts purchases, that includes a lot of information on how to make significant power gains.
I have some unique valvetrain mods and upgrades that also add significant bottom end torque without losing top end.

I have tested almost every part on my personal Shop Suburban an it is a
99 Suburban 350" Engine, 250,000miles that used to get about 12mpg and after about 5 years of playing around it is up to 17mpg. No matter what it still costs over $100 to fill the damn thing up.
I bought it from Hendrick with 25,000 miles in 2005 and run about 50K a year.