At 8000 feet is there a difference between a 4 cylinder 250 hp turbo and the same car with a 6 cylinder also 250 hp without turbo (presuming all else is the same)?

75

Asked by Mar 10, 2013 at 03:50 PM about the 2005 Subaru Outback 2.5 i Wagon

Question type: General

I drive through Colorado several times a year and I have a 2005 Subaru Outback (4 cylinder, 168 hp, I believe).
I know that Subaru has turbo and 6 cylinder models and i was thinking, would a car rated with the same HP but with a Turbo do better in the high altitude (less dense air, less oxygen) than the sam car with the same hp but no turbo, only 6 cylinders instead?

5 Answers

58,885

With today's computer controlled vehicles it makes no difference where you run them. High altitudes, deserts, or the Arctic Tundra. The computer will make the necessary adjustments to keep the vehicle running as it should. Years ago, before we had this technology, carburetors had to be jetted leaner for higher altitudes, ignition timing adjusted for specific operating conditions, and so forth. Now the computer handles all that. HTH. -Jim

3 out of 3 people think this is helpful.
75

Followup to JS08016 I guess I was thinking in terms of peak performance. If I were to accelerate up a steep slope at high altitude, would one or the other engines perform better, or would it be, as you say, fully compensated for by the computer. My theory is that the turbo, by compressing the air, would do better than the 6 cylinder engine. The other thing I didn't really factor in is that a Turbo is lighter than a 6 cylinder engine... but let's just say the Turbo has added dead weight in the front passenger seat to compensate.

58,885

I see & agree. Turbo would probably perform better. With thinner air both would have to work harder than at sea level . -Jim

1 out of 1 people think this is helpful.
Best Answer
92,075

The forced air would definitely have more power than a NA engine.

2 out of 2 people think this is helpful.
15,605

I'm glad you asked this question. I have a 2010 Subaru Outback 2.5 with the CVT transmission and took my car and tear drop trailer which weighs about 1,000 pounds to the North Rim of the Grand Canyon, elevation, 8,800 feet. The car worked just fine and I got excellent mileage on this trip. The difference in towing capacity on the H6 and H4 is 300 pounds. If you really need the two seconds of acceleration on the H6 and don't mind the extra money for gasoline, then go ahead and get the H6, but, there's no reason to do so. The Outback is not a racing vehicle, rather, it's a great wagon and you'll be fine with the H4. Be sure to get the CVT, it's a superior transmission, you're always in the right gear and it is very responsive. There is no turbo option on the current Outback 2.5 and the gas mileage is great.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Is it timing belt or rod adjustment or oil pump ? 14 answers

    I've a 2000 Outback 2.5L, just went over 160km. It starts good any weather all year around. But it has developed over last couple of years an annoying clikety clack off timing push-rod kind of ...

    2000 Subaru Outback Base Wagon

    -

    Maintenance & Repair

  • So many problems--is it normal? 28 answers

    My 2000 Outback has 144,000 miles, and I've had to put SO MUCH money into it! Here are a few repairs: Two new front axles (right and left), new CV Boots, new axle boots, catalytic converter, head ga...

    2000 Subaru Outback Limited Wagon

    -

    Maintenance & Repair

  • What should I try next 46 answers

    I have a 2001 Subaru Outback and it is overheating only when it's drive hard. I've changed the thermostat and water pump. I don't believe it's the head gasket because I've done a exhaust gas test...

    2001 Subaru Outback Base Wagon

    -

    Maintenance & Repair

  • Annual maintenance costs/ repairs for your Subaru? 14 answers

    If your car is five to ten years old, how much on average do you spend on regular maintenance? And, if you have experienced repairs between 50,000 and 100,000 miles, please state them in your ans...

    2010 Subaru Outback 2.5i Limited

    -

    Maintenance & Repair

  • How long do Subaru Legacys last? 58 answers

    What is a typical lifespan for Subaru Legacy wagons? I have a 1996 Subaru Legacy Brighton with 132,000 miles (bought it used, with 18k already on it). I've kept it maintained over the years. Two di...

    1996 Subaru Legacy 4 Dr Brighton AWD Wagon

    -

    General

Outback

Looking for a Used Outback in your area?

CarGurus has 25,648 nationwide Outback listings starting at $1,000.

ZIP:

Search Subaru Outback Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Subaru Outback Experts

#1 Markw1952
Markw1952
Reputation 5,220
#2 TheSubaruGuruBoston
TheSubaruGuruBoston
Reputation 1,580
#3 FordNut
FordNut
Reputation 1,490
View All

Related Models For Sale

Used Subaru Forester
333 Great Deals out of 20,049 listings starting at $1,382
Used Subaru Legacy
198 Great Deals out of 15,040 listings starting at $900
Used Subaru Impreza
172 Great Deals out of 10,618 listings starting at $1,495
Used Honda CR-V
907 Great Deals out of 66,880 listings starting at $1,995
Used Toyota RAV4
821 Great Deals out of 53,146 listings starting at $2,199
Used Toyota 4Runner
341 Great Deals out of 20,329 listings starting at $1,250
Used Toyota Highlander
640 Great Deals out of 22,079 listings starting at $2,000
Used Toyota Tacoma
712 Great Deals out of 32,122 listings starting at $2,000
Used Jeep Grand Cherokee
1,001 Great Deals out of 65,972 listings starting at $1,500
Used Subaru Impreza WRX
38 Great Deals out of 1,173 listings starting at $2,795
Used Honda Accord
1,081 Great Deals out of 76,805 listings starting at $1,395
Used Honda Pilot
527 Great Deals out of 19,353 listings starting at $950
Used Ford Escape
1,416 Great Deals out of 83,997 listings starting at $1,400

Used Cars For Sale

2017 Subaru Outback For Sale
16,701 listings starting at $23,652
2016 Subaru Outback For Sale
34 Great Deals out of 895 listings starting at $21,963
2015 Subaru Outback For Sale
81 Great Deals out of 1,281 listings starting at $14,995
2014 Subaru Outback For Sale
69 Great Deals out of 1,537 listings starting at $9,995
2013 Subaru Outback For Sale
48 Great Deals out of 1,128 listings starting at $9,970