Intake clean. WOW!

[Panik]

 

 

That would be called a vacuum leak.

Lol! That's kinda what I figured. Thanks for the concise response

[bass mechanic]

Since everyone is talking about mpg in a 6.2 here is my new denali 25 and 50 mile average all highway at 75 mph

I seriously doubt many have managed to better my best readings seen here

 

 

 

Sent from my iPhone using Tapatalk

Edited August 17, 2015 by bass mechanic

[Spurshot]

Eastbound on 70?

[Silverado-Hareek]

Wow those are great numbers. 25.4 mpg has been my best average over 50 miles so far.

[bass mechanic]

Eastbound on 70?

no i have not hit i-70 yet i only have 1800 miles and 550 of those were on my way back home from the Kansas dealer where i bought it. i only got about 23 mpg on that trip the truck was brand new and i had a headwind

the 32.9 mpg average was just as i passed through he Denver tech center area headed north to thorton and was in slower traffic.

to be honest if city traffic is light i can get close to 25 mpg in town if i can keep rolling. i firmly believe that if GM had the start stop technology found on other cars where it kills the engine at stoplights i think the city mpg might improve about 2-3 mpg

[bass mechanic]

Wow those are great numbers. 25.4 mpg has been my best average over 50 miles so far.

i have a theory, just like how us folks at high elevation don't get much HP out of the engine due to lack of air. we also have less of it to push out of the way at highway speed!

 

also i get nearly the same number in the mountain passes. yes it gets about 10-12 mph up the hills but uses no fuel on the downhill at all due to fuel cutoff and a higher gear ratio allows less engine braking if you let it roll to the next hill often times your averaging close to 70 MPG on the down hills to make up for it.

also mountain roads are usually 65 mph

Edited August 18, 2015 by bass mechanic

[Back in a Bowtie]

how often do you guys think this should be done? I have almost 18k and noticed a slight drop in my avg mpgs lately. I cleaned my filter (airaid) at my last oil chage (15K) but thinking of doing this now. Too soon?

[Silverado-Hareek]

how often do you guys think this should be done? I have almost 18k and noticed a slight drop in my avg mpgs lately. I cleaned my filter (airaid) at my last oil chage (15K) but thinking of doing this now. Too soon?

 

According to my mechanic and BG, within every 15,000 miles. The longer you drive without cleaning the valves, the more the "crud" gets baked onto them and the harder it is to remove down the road. Significantly high mileage may mean that you can never get the valves 100% clean with chemicals alone and tearing down the engine and using a mechanical method may be required.

[Back in a Bowtie]

 

According to my mechanic and BG, within every 15,000 miles. The longer you drive without cleaning the valves, the more the "crud" gets baked onto them and the harder it is to remove down the road. Significantly high mileage may mean that you can never get the valves 100% clean with chemicals alone and tearing down the engine and using a mechanical method may be required.

 

to pep boys it is then, ill do it on my lunch break.

[Gmcant33]

The good news: I did the BG induction service yesterday and the truck seems to be running great afterwards, no issues so far *knocks on wood*

 

The bad news: I could not get before and after pictures of the valves. The way the intake is designed on these engines, you can't get the borescope in there because of all the bends and turns. We would have had to remove the intake manifold to see the valves and I wasn't about to do that on an engine with only 15k miles.

 

So the catch can debate will have to rage on. I will say I have not really noticed much of an improvement with the truck as others have reported. It honestly wasn't really running bad before I did the service, I just wanted to get in before 15k miles to take advantage of BG's warranty. So if guys without catch cans are noting an improvement in performance after the service and I'm not noticing much of anything, I'd argue that's evidence in favor of the catch can doing what people say it should be doing....keeping the valves clean. I only had 11,500 miles on the truck when I installed the catch can so there wasn't much time for a lot of build-up to happen and dramatically affect performance, although I don't doubt that some buildup did occur and the service yesterday took care of it.

 

I'm going to post this in the catch can thread as well.

 

 

EDIT: Forgot to add it was about $78 in materials and $117 in labor for the BG service so $195 total. You have to get your oil changed as well afterwards so factor that into the total if you're considering doing this service.

 

Curious can this be done in ones garage 117 for labor did they have to remove parts or such just curious I'm thinking about doing the same thing also is this product sold in autozone wish we had before and after pics but I understand these engines are like a temples maze glad u did it and haven't had any issues hopefully I get around it

[Gmcant33]

Since everyone is talking about mpg in a 6.2 here is my new denali 25 and 50 mile average all highway at 75 mph

I seriously doubt many have managed to better my best readings seen here

Sent from my iPhone using Tapatalk

Wow u get better mpg than most 5.3 can achieve lately my 5.3 has been low mpg my previous 14 e85 was doing better hate that 2015s come with an option of e85 should be standard

[bass mechanic]

Wow u get better mpg than most 5.3 can achieve lately my 5.3 has been low mpg my previous 14 e85 was doing better hate that 2015s come with an option of e85 should be standard

Yes what's interesting is I only managed about 33 mpg in my Cadillac with a 3.6l over the same route.

Same with my Lexus IS 350 about 33 mpg.

I also used to have a corvette z06 and got about 32 mpg over the same route.

The secret to good mpg really doesn't have a lot to do with displacement. It's all about gearing and wind resistance.

Small engine cars get better mpg only because at full throttle or anything in between they simply cannot burn enough fuel even with a lead foot driver.

If you use only the power necessary to get up to speed and maintain you can make a v8 just as efficient.

Additionally a vehicle that is fairly heavy can carry momentum a lot farther than a small car.

Hybrids do it in a similar way by storing electricity in a battery.

 

 

Sent from my iPhone using Tapatalk

[Back in a Bowtie]

well... did it at lunch. Idle certainly feels smoother. Will re-set my mpg for drive home. Tons of white smoke btw.

[RobZ71LM7]

Just remember to change your oil afterwards.

[ghgmi]

If you use only the power necessary to get up to speed and maintain you can make a v8 just as efficient.

Additionally a vehicle that is fairly heavy can carry momentum a lot farther than a small car.

Hybrids do it in a similar way by storing electricity in a battery.

 

 

That is not similar, that is different!