new truck choices?????
- Thread starter mtnbound
- Start date
true...I am sitting right at sea level and normally ony run up as high as mabye 4000ft with the truck..but down here..not even close...
A turbo motor still loses power with elevation. It's just not as drastic.
Major elevation can also be the death of a turbo. Ford knows this all too well.
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Major elevation can also be the death of a turbo. Ford knows this all too well.
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Please elaborate on elevation and turbo death.
Lets say the ambient air temperature is the same, 60 F.
At sea level atmospheric pressure is 14.7 psia .... at 5,280 feet above sea level its something like 11.96 psia.
So you're at 2.74 psia less pressure at the inlet of your turbo the higher up you go.
Lets say to achieve your rated power output from your motor, at sea level the turbo charger has to produce 10 psi of boost and have the intake temperature at 140 F. The turbo boosts your absolute manifold pressure to 24.7 psia, and the discharge temperature from your turbo before it runs through the after cooler is something like 220 F (for the sake of argument, if you guys really want me to I could calculate all this out but its sat morning and I dont want to
) .... Knowing that you're going to have some loss through the after cooler (maybe 1 psi?) the discharge pressure at the turbo is slightly higher, but the end result at the sea level case lets say is that with the turbo and after cooler properly sized your motor achieves its desired power output. Now lets go up to 10,000 feet ... Atmospheric pressure (assume the same 60 F temperature) is something around 10.5 psia. So now, as you can see, your turbo has to generate an additional ~4 psi of boost to acheive what amounts to the same absolute manifold pressure that it did at sea level. What this translates into is a higher discharge temperature coming off the turbo, and if the turbo after cooler wasn't sized properly for the flow rate through it for the range of temperatures and pressures the system operates, you would have degraded performance in the fact that the turbo might not be able to produce enough boost and if it does it does so inefficiently resulting in even higher discharge temperatures, which all could possibly equate to degraded performance at high altitudes.
Thats sort of the short of it I guess ...
But yes, the statement is true, the turbo system is still effected by altitude, but if its properly designed .... not anywhere near as much as a NA motor will be.
6500lbs I'd go ecoboost. better mpg as a daily driver, will drive nicer and it's a newer truck.
R
rmk01r1der
Active member
Stay away from the 6.4 IMO. Both the duramax and the eco are very nice trucks. Either would be a good choice. I personally would go with the duramax tho, not much of a half ton fan when pulling anything.
I would go with the eco boost. I have a 08 3500 duramax. Great truck but it sucks paying the fuel bill every month. It has 35 inch tires. Stock tires help but they don't get anywhere close to 32 mph like the one post said. Yeah, I can get it to read 99.99 coasting down the hill but I can't ever remember coasting to work. I have efi live but the mileage still sucks. Better with it then it was stock. The lb7 was the only one to get good mileage. Maybe it is the way I drive. I have had the exact same trucks, as friends, and I get 13 and they claim 20. I will always have a diesel but if I were you, for the scenario you listed, I would get the ecoboost.
6.4 PSD!!!
intake, straight pipe, spartan tuning, amazing daily driver, 350hp over stock just in tuning, stock tranny will last forever with 300 over as long as you dont abuse it and there isnt anything you will put behind it you will even feel. Its what my buisness partner has and he is at 160,XXX mods since 20k or so and nothing but normal maintinance so far. super streetable power but the 550 hp at the wheels is PRETTY fun when you need to go pass someone, and again, makes any trailer your pulling feel like a 2 place open.
If my 7.3 wasnt still running so strong thats what i would upgrade to. I guess i have had a half ton and yes they are nicer and cheaper to have for a lot of the time, but damn, throw a load behind a 3/4 or 1 ton and its just hard to say know.
intake, straight pipe, spartan tuning, amazing daily driver, 350hp over stock just in tuning, stock tranny will last forever with 300 over as long as you dont abuse it and there isnt anything you will put behind it you will even feel. Its what my buisness partner has and he is at 160,XXX mods since 20k or so and nothing but normal maintinance so far. super streetable power but the 550 hp at the wheels is PRETTY fun when you need to go pass someone, and again, makes any trailer your pulling feel like a 2 place open.
If my 7.3 wasnt still running so strong thats what i would upgrade to. I guess i have had a half ton and yes they are nicer and cheaper to have for a lot of the time, but damn, throw a load behind a 3/4 or 1 ton and its just hard to say know.
I never said it gets it consistently, i mainly get 22-24 mpg, by no means is my truck stock either. It's not lifted, but it has slightly larger then stock tires.
NADP Race Transmission & NAPC Built Transfer Case
AFE Stage 2 Intake with Snow Performance Methanol Injection
FASS 150gph Titanium Series Pump
PPE Tuner until i tune it with my EFI Live
PPE Race Valve & PPE Bored Fuel Rail Fitting
Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars
8.8liters = 1.9 gallons
100km = 62milles
I'm from Canada so my truck shows in metric.
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ECOBOOST DOES NOT REQUIRE PREMIUM! Regular 87 octane is recommended. I've run 85.5 here and never had a problem. Check out the link if you don't believe me!
http://www.ford.com/trucks/f150/specifications/engine/
Ecoboost is 420 ft lbs @ 2500 RPM. It makes 90% of its peak torque from 1700-5000 RPM
8.1 Chevy is 450 ft lbs @ 3200 RPM
6.2 Ford is 434 ft lbs @ 4500 RPM
6.2 Chevy is 417 ft lbs @ 4300 RPM
5.0 Ford is 385 ft lbs @ 4250 RPM
6.0 Chevy is 380 ft lbs @ 4200 RPM
7.4 Chevy is 410 ft lbs @ 3200 RPM
V10 Ford is 457 ft lbs @ 3200 RPM
I've ridden in a Chevy 6.2 1/2 ton and Escalade EXT 6.2 towing the exact same trailer that I towed with the Ecoboost. The Ecoboost will run 2500-3000 RPM on the same hill the 6.2 will be running 5000 + RPM. And the GMs shift a lot more.
The Ecoboost's low RPM torque is better then any stock gas engine out there. I've been so happy with its pulling power. The V8s just rev more and make more noise.
You factor in all my towing is from 5000-7500 ft were you are loosing 15-22% of your horsepower on the naturally aspirated engine, the Ecoboost feels way stronger then any other gas engine I've been in.
http://www.ford.com/trucks/f150/specifications/engine/
Ecoboost is 420 ft lbs @ 2500 RPM. It makes 90% of its peak torque from 1700-5000 RPM
8.1 Chevy is 450 ft lbs @ 3200 RPM
6.2 Ford is 434 ft lbs @ 4500 RPM
6.2 Chevy is 417 ft lbs @ 4300 RPM
5.0 Ford is 385 ft lbs @ 4250 RPM
6.0 Chevy is 380 ft lbs @ 4200 RPM
7.4 Chevy is 410 ft lbs @ 3200 RPM
V10 Ford is 457 ft lbs @ 3200 RPM
I've ridden in a Chevy 6.2 1/2 ton and Escalade EXT 6.2 towing the exact same trailer that I towed with the Ecoboost. The Ecoboost will run 2500-3000 RPM on the same hill the 6.2 will be running 5000 + RPM. And the GMs shift a lot more.
The Ecoboost's low RPM torque is better then any stock gas engine out there. I've been so happy with its pulling power. The V8s just rev more and make more noise.
You factor in all my towing is from 5000-7500 ft were you are loosing 15-22% of your horsepower on the naturally aspirated engine, the Ecoboost feels way stronger then any other gas engine I've been in.
I had the same choices about a year and a half ago when I was buying my truck. After driving all of them, there was only one I got out of, and couldn't get the smile off my face. I had to have the Duramax.
Do I regret it even though I don't have my trailer anymore, and mostly use it as a daily driver? Nope, not a bit. 18 months later, and I still have that smile everytime I get out of it.
After EFI live, I'm getting about 15-16 around town, and about 18-20 on the freeway. I get about 12 mpg when towing. There's no reason I need this much power, but it sure is fun. Your going to get a few mpg better with the gas truck, and it's maybe $.30, $.40 cents a gallon cheaper. I think if you can afford $30,000 for a truck, you shouldn't be worried about an extra $20-$30 a month for fuel though. You'll make it up with the fun factor.
Do I regret it even though I don't have my trailer anymore, and mostly use it as a daily driver? Nope, not a bit. 18 months later, and I still have that smile everytime I get out of it.
After EFI live, I'm getting about 15-16 around town, and about 18-20 on the freeway. I get about 12 mpg when towing. There's no reason I need this much power, but it sure is fun. Your going to get a few mpg better with the gas truck, and it's maybe $.30, $.40 cents a gallon cheaper. I think if you can afford $30,000 for a truck, you shouldn't be worried about an extra $20-$30 a month for fuel though. You'll make it up with the fun factor.
Haha, yeah they're still half tons. Wherever Ferd got the notion to "claim" over 3000lb payload in an F150 I'll never know. It's false advertising for sure.
I've had numerous F150's including the '11 I have now and the 6-700lbs of fuel tank and tool box I have in the back daily squats the rear end pretty good. I installed a set of Timbrens on this truck (overload springs on all the previous trucks) and with just that weight in it, it rides hard on the Timbrens. 3000+lbs would bury the @ss end of the truck!
OP, good call on the Dmax! You would have had buyers remorse if you were considering a diesel and ended up with the Eco pooch.
