I bought my 2007 Silverado LTZ, 5.3L, Crew Cab about 6 months ago. The best fuel mileage ive been able to get is and average of 16.5 mpg. I drive the same route to work and back everyday. It is about 100 miles round trip. This is fully tuned. My truck does have AFM and its being used.

I just bought an STS turbo for the soul purpose of increasing fuel mileage. When I contacted STS with my idea, they agree that the truck will pick up quite a bit of mpg as the turbo is being sized that way.

After tuning AFM and driving around monitoring the V8/V4 mode, ive been able to get a very good idea how much load it takes to stay in V4 mode.

I will be able to tell you 100% for sure if the turbo helps after I install it. It should be here in about a week or so from today. It will run a max of 3 psi for now. It will reach 3 psi by 1500 rpm. This truck will be dyno tuned with the new setup to verify AFR and spark is set correctly. Ill keep you posted as progress goes. Ill post some pics of the truck as I go also.

Feel free to ask any questions about the setup and how it performs etc...

 

That sounds like an interesting idea! Are you gonna post the results in this thread or start another one?

 

I think running a turbo like that, will really shut down this thread, much like it already has been by several members....

Without looking for peak boost number/dyno number etc, you could really maximize efficiency of a turbo set up.

 

Be sure to update..

 

I will start another post and tag this thread so everyone can keep up on it. Ice wanted to do this for a long time and finally got the right truck to do it on. I already have stock dyno numbers also so we will know the difference between power and fuel economy. Ill post picks and the dyno graph on the new thread. Thanks for the feedback

 

See this thread to follow the progress on the turbo install for mileage.

https://www.performancetrucks.net/fo...d.php?t=478072

Thanks

 

I figure this is good for a thread bump...

So when a turbo can't flow enough air at some boost level, we know it runs into the choke range of the map. From there wheel speed increases dramatically, turbo damage becomes likely, and it basically turns into a hair dryer (literally). This seems to be happening on my S465. However...it does not hit target boost before choking. It reaches some odd boost level and sort of hovers there while the turbo creeps past the choke line. You'd think with as fast as this thing spools that it would hit max boost and then move to a higher flow region of the map to start choking. Max boost right now is 11psi, and I only see 7psi at WOT. If it flows more at 11psi than it does at 7, why does it linger at 7? Turbo dudes chime in...

 

...bump

 

I'll jump in here. As someone who has never had a turbo vehicle, would that fact still remain true, with the technology in tuning available nowadays, along with extremely efficient turbos? That quote is from '97, so just how accurate is that? I haven't been around long enough to get in this thread when it was first started, but that quote seems to negate real-world results--seems like the standard theory is that if you stay in boost, you'll gain mileage.? Please fill me in on this. I'm always up for learning, and turbos are probably my weak point.

 

The book is 15 years old, however the physics of it don't change. New turbo technology might mitigate mileage losses, but not reverse them. In most cases you won't even notice a mileage difference after installing a turbo.