H3 w/ V8 in near future?

[Michael1]

Originally Posted by f5fstop

To the original question, you won't see a V8 in '07. Maybe a diesel late in the model year. As for the disbeliever on the drivetrain components, if, and I do say if (small if), a V8 is installed, it will have the same axles and Tcases; won't mention the trans, but if it is different it is not due to torque, but for fuel mileage

So IF GM were to use a different transmission, IF they were putting in a 5.3L V8, would they bump up the transmission from 4- to 6-speeds to improve fuel economy?

Michael

[HummBebe]

THAT'S ENOUGH WITH THE ARCHAEOLOGICAL EXPEDITIONS.....


STOP IT!

Hey the V8 might happen in the H3 just in time to coincide with $4.00+ per gallon gas prices. Not necessarily the path to significantly increased sales.

S.

[The Green Lantern]

Originally Posted by HummBebe

THAT'S ENOUGH WITH THE ARCHAEOLOGICAL EXPEDITIONS.....


STOP IT!

WHy? http://elcova.com/eve/forums

[KenP]

Originally Posted by HummBebe

THAT'S ENOUGH WITH THE ARCHAEOLOGICAL EXPEDITIONS.....


STOP IT!

Atleast it wasn't me.

[f5fstop]

Originally Posted by HummBebe

THAT'S ENOUGH WITH THE ARCHAEOLOGICAL EXPEDITIONS.....


STOP IT!

For a while I thought I was going crazy....Glad to hear others are suffering from these ancient threads appearing out of nowhere.

[fourfourto]

Originally Posted by evomind

i get about 200 miles from full to warning light. i think i was getting 220'ish b4 the lift and bigger tires. im not sure what 200 miles equates to in mpg, keep forgetting to check.
as far as tahoes being rated at 20 on the highway, all that rating means is that its humanly POSSIBLE to achieve that. real world its probably closer to 17.5 cause ur not gonna drive at 55mph steady the whole time.

I always get over 300 miles and my light has not gone on yet.
My wife dont think it works It does because it takes less than 20 gallons .

[The Green Lantern]

I get 225 miles....

[f5fstop]

I got 362 once, and I was sweating...

[The Green Lantern]

Originally Posted by f5fstop

I got 362 once, and I was sweating...

...that's it, I'm going back to stock form!!!!

[f5fstop]

Eastbound Colorado/Kansas, speed was between 75 and 80, best fuel mileage of the trip Kept telling my kid that he was young and strong and that pushing a H3 on flat ground would not be too bad.

23 gallons w/3.5L I5 is a decent sized tank compared to some setups.

S.

[evldave]

my best was about 350 or so. Last tank was 246 (towing a trailer for most of that tank), usually around 300 or so.

What bites is my brother just got back from a trip to Tahoe. He's driving a 2007 GM 1500HD w/6" lift and 37" tires. His average mpg for the whole trip was ~15.5 mpg. As good or better than my H3. wtf?

Returning from Tahoe at 6300 feet is all almost all downhill and the howling tires make so much noise that his wife makes him drive slow. Good for an isolated case of good gas mileage. I've hit 18mpg in my H3 just by keeping it below 70mph and that was in hilly terrain.

S.

[ChevyHighPerformance]

Originally Posted by HoKC

Do not think that the V8 has to mean less mileage. The new Tahoe is rated at 20mpg on the highway with a V8.

I agree. If you ever wonder why the H3 downshifts so much from 4th to 3rd, it's because of the shift speed versus %TPS data. Here is this data from a colorado I5 (which is very similar to the H3). It's complicated, but if you look at it enough it will break apart. Assume you are applying 19% throttle, you'll shift into 2nd gear at 17.9 MPH, then into 3rd at 32.6 MPH, then into 4th at 44.1 MPH. If you blip the throttle by about 12 - 13% (to 31% throttle) the H3 will kick down to 3rd. This is why the H3 downshifts so much - not saying good or bad design - just saying why it does. It takes a bigger throttle blip (20% or more) to downshift from 2nd and 3rd. With a 5.3L, the downshift %TPS can be moved higher and the upper gears (lower engine RPM and lower parasitic losses) can be reached at lower RPMs. I feel that the 5.3L could have the same or better fuel economy as the I5 especially with DOD. I'd even consider 4.11:1 diferentials and a lower low range gear for better fuel economy and the same off road gearing.

In short a V8 has the potential for slightly better highway mileage, that would be great. No way it's going to have better city or combined mileage though.

S.

[ChevyHighPerformance]

Originally Posted by Steve - SanJose

In short a V8 has the potential for slightly better highway mileage, that would be great. No way it's going to have better city or combined mileage though.

S.

This data is directly from the Chevy website for Silverado 1500 trucks. The 4.3 L V6 (195 HP, 260 lb-ft) 4x4 with a 4-speed auto gets 15/18 MPG city/highway.
The 5.3 L V8 (295 HP, 335 lb-ft) 4x4 with a 4-speed auto gets 15/19 MPG city/highway.

This is just one example of no loss in city MPG but better highway MPG.

Good to know about possible similar mediocre gas mileage with a V8. Key word is possible since Hummer aerodynamics and tire selections are unique which impact highway mileage. And all the 4wd trucks listed above have lower city mileage than the H3.

Note 2006 H3 EPA mileage (all H3's have 4wd as standard for a reason):

16/19 auto
16/20 manual


S.

[BigBill]

I was told by a friend of mine that the H3 will definitely get a V8 engine in Fall 2007. My friend works for GM in Detroit at the tech center, and he confirmed this information from the program manager for this line. Also there will most likely be another engine upgrade, E85 option, in 2010.

Bill

[blindzebra]

displacement on demand people!!!