Eco modding the Tahoe Hybrid 40MPG Goal..

[aerohead]

Online,somewhere now,there is an image of a GM SUV wind tunnel model,with a significant boat tail.It is claimed to reduce drag by 29% I believe.
This boat tail shows up on US Patent,8590961,February 21,2012,by Thomas Scott Breidenbach.It's a variation on a variation of the Ahmed Body boat-tail, both in Huchos' textbook.
With rear wheel skirts,this modification would probably satisfy your load reduction requirement for the CVT mode.

[Vman455]

That's an interesting patent; here's the link. It's actually for a collapsible boat tail that retracts using linkages in the frame!

[Tahoe_Hybrid]

Originally Posted by Vman455

That's an interesting patent; here's the link. It's actually for a collapsible boat tail that retracts using linkages in the frame!

nothing on the market they're just patent squatting..


after soldering that 12v battery cable looks like the Regeneration is working correct i have never been able to do that.. see vid


also auto stop seems to work correctly as well..

reuploaded muted some to disable copyright thing

https://www.youtube.com/watch?v=c_xL...ature=youtu.be

[jazclrint]

Which wire did you solder? How did you get it to light up the tires? My Caddy moves, but it doesn't have much off the line snap. Not enough to spin tires.

I have a 2012 Caddy Hybrid that my wife drives 15 miles a day and the Speed limit never goes over 45mph. My regen seems to work just fine. When we were in Maine visiting family we got better gas mileage (22mpg) going to town and back on back roads. But back here in SWFL we struggle to get 17mpg on her daily commute. Any tips, or thoughts? The main road is 45mph with a ton of stoplights. If I had the money and know-how I'd love to gut the battery pack and load it up with Lithium batteries and covert it to a Plug-in hybrid.

[jazclrint]

I took a spin in my wife's hybrid this afternoon. City and highway. Sure enough in my Caddy when I'm going under 45-50mph the instantaneous fuel economy gauge is reading in the low to mid 30's mpg. My Torque Pro app however was saying high 20's to low 30's. Still, that's the truck's sweet spot. But I'm not getting much over 20mpg on the interstate.

[freebeard]

here's the link.

wow, that's completely unworkable!

If the goal is 28-31 to 35-40 MPG calculating median to median that's 127%, so aerohead may be right.

Count the pivot points and calculate the wear and cumulative slop something like that would have. Hear Elon Musk whispering in your ear 'the best part is no part. the best process is no process'.

Then realize that the skin isn't even included. Then contemplate origami folded Coroplast sheets. That gets you the skiin and hinge all in one.

[ksa8907]

Originally Posted by jazclrint

I took a spin in my wife's hybrid this afternoon. City and highway. Sure enough in my Caddy when I'm going under 45-50mph the instantaneous fuel economy gauge is reading in the low to mid 30's mpg. My Torque Pro app however was saying high 20's to low 30's. Still, that's the truck's sweet spot. But I'm not getting much over 20mpg on the interstate.

The on board guessometer is exactly that. The reality is these vehicles are full size, body on frame, pushrod V8, in my case 4wd, trucks.
Averaging 20mpg is pretty good for the technology from 15 years ago. The comparable denali/escalade with the 6.2l would be lucky to average 15mpg.
15 to 20 is a 33% reduction in fuel consumption.

[Piotrsko]

The guess-o-meter has no way of knowing how much fuel is being actually used, it can only calculate theoreticals from the command data. Anything else can use better fudging of the data

[Vman455]

Originally Posted by ksa8907

15 to 20 is a 33% reduction in fuel consumption.

Because of the metric "mpg" you have to flip it around to get reduction in fuel used:

15 mpg = 6.67 gal/100 mi
20 mpg = 5 gal/100 mi
((5.00 - 6.67) / 6.67) * 100 = 25% reduction in fuel consumed

Really, mpg is a stupid metric precisely because of this, where 33% improvement in mpg != 33% reduction in fuel consumed.

[ksa8907]

Originally Posted by Vman455

Because of the metric "mpg" you have to flip it around to get reduction in fuel used:

15 mpg = 6.67 gal/100 mi
20 mpg = 5 gal/100 mi
((5.00 - 6.67) / 6.67) * 100 = 25% reduction in fuel consumed

Really, mpg is a stupid metric precisely because of this, where 33% improvement in mpg != 33% reduction in fuel consumed.

Nothing to see here, just someone who shouldn't be posting when it's close to my old-man bedtime.