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Turbo or No Turbo?

13

Comments

  • ateixeiraateixeira Posts: 72,587
    In that case I'll go back to the speeding ticket argument. ;)

    I just got nailed by a speed cam doing 46 in a 35. Gimme a break. I'm the slowest minivan on the road! Randolph Road has 3 lanes in that area, 3 lanes, and it's just 35mph.

    266hp = speeding ticket
    175hp = no speeding ticket

    At least there are no points assigned. I've been nabbed twice in the Miata and once in the van. Usually in places where they set the speed limit artificially low (25mph on MacArthur Blvd).

    :D

    You're moving to DC? Really? Cool, yeah I definitely want to drive it again.

    Though you're going to have to trade it in else you'll be getting tickets like those on a weekly basis.

    Bob's been nailed twice in the DC area with his WRX, and he lives closer to Baltimore! :surprise:
  • paisanpaisan Posts: 21,181
    "... As for maintenance, if you read the specs, the "severe" interval for the NA cars is 3,000 miles as well, so the oil changes are probably not even an extra cost. If you drive the car hard, sit in traffic, take short trips, etc. Those are all considered 3k changes even on the NA cars. "

    So under the same driving conditions, just maintain your turbo like an NA and you should do fine, right?

    "... Caring for Subaru Turbocharged Engines ... The following information updates factory recommendations for the care and maintenance of new Subaru turbocharged vehicles... Due to heat generated by the turbocharger and carbon deposits contained in exhaust gas, the oil in a turbocharged engine will deteriorate faster than the oil in a naturally aspirated engine. Therefore, special care should be taken to use proper grade oil and to monitor oil deterioration. Under normal driving conditions, the recommended oil and oil filter change
    interval for turbo vehicles is every 3,750 miles or four months, whichever comes
    first. However, for vehicles driven in conditions beyond normal, such as racing
    conditions, the oil and oil filter may require more frequent changing... Any driving where the engine speed is kept high – either by using lower gears at higher speeds or using engine braking – is considered racing-type driving. A “track day” or autocross event requires an oil and oil filter change immediately before and immediately after the event.... Carbon deposits produced by a turbocharged engine can accumulate at the bottom of the oil pan. When changing the oil, always drain the oil through the oil drain plug hole on the oil pan..."
    http://www.drive.subaru.com/Sum08/Sum08_Turbo.htm


    That's all pretty vaguely written. So what's "more frequently than 3750? 3k? I always change mine at 3k-5k miles on my cars and no issues. Heck my 94 turbo legacy went 150k miles with 10k+ track miles (6000 rpms for 2hrs at a time) and never burned a drop of oil.

    -mike
  • p0926p0926 Posts: 4,423
    Don't even get me started on speeding tickets. I went almost 20 years without getting one and then got two in the span of a couple of months after I moved out to the land of photo radar. The first ticket was for going 23mph in a 15mph zone :cry: I even went to court on that one and while the judge was very sympathetic, he still found me guilty. can you say "revenue stream"?

    To keep this post on topic though, I don't think having more HP increases your chances of getting a speeding ticket, although it does get you to the speed limit faster. The key is to know your speed and keep it below the photo radar's threshold.

    Interestingly enough, both my wife and I have discovered that it's easier to speed in the XT than the SLK. Uh oh, I think I just made an argument against getting a turbo ;)

    -Frank

    P.S. Yep looks like we'll be moving to DC next April.
  • paisanpaisan Posts: 21,181
    On that photo radar, what band radar do they use? I'm assuming X, K or Ka, and is it detectable by a radar detector? If so it should be easy to avoid tix on them.

    -mike
  • p0926p0926 Posts: 4,423
    Hmmm, good point. I gave up my "Fuzz Buster" over 20 years ago but it may be time to look into them again :)

    -Frank
  • ateixeiraateixeira Posts: 72,587
    8mph over the limit? :sick:

    Here they are everywhere, plus my old detector would false a lot. A ton actually.

    Not to mention they're illegal in VA, which I go to on occasion.

    I dunno, Frank, the wife used to get a lot of tickets with her old V6 sedan. She dropped to a 4 cylinder Legacy and didn't get a single ticket in 7 years.

    Definitely driver's fault but the extra power sure doesn't help in that regard.
  • p0926p0926 Posts: 4,423
    Not to mention they're illegal in VA

    Oh well then, that options out... I'll be living and working in VA.

    For some reason I thought that radar detectors were illegal in MD? Seems like when I used to drive up I-81, you had to be careful on that short stretch that goes thru MD.

    -Frank
  • rshollandrsholland Posts: 19,657
    Radar detectors are illegal in both VA and DC. Maryland is not a problem, as they are legal there.

    Move to MD Frank, not VA. ;)

    Bob
  • ateixeiraateixeira Posts: 72,587
    He'd still have to take it down every day on the way to work.

    Oh boy, you're gonna hate northern VA traffic. Watch, your next car will be a CVT Prius. :D
  • paisanpaisan Posts: 21,181
    The new dectors are pretty advanced. I just got my first one an Escort 9500i, it allows you to block out a frequency @ a particular GPS location (has a built in GPS chip) so that you can eleminate false reports like at toll booths, banks etc. There is also a feature to mark speed traps and cameras. It will warn you 1 mile in advance. The GPS also can display your GPS speed which gives you an almost heads up display. There is an even newer version where you can download speed trap and camera info from Escort's website. The GPS also allows it to have speed sensitive radar (if you are going under 30mph it will only warn you briefly since you are likely under the limit)

    Technology is pretty nifty!

    -mike
  • ateixeiraateixeira Posts: 72,587
    Yes it is, and I appreciate tech gagdets as much as anyone.

    Around here, though, the traps are EVERYWHERE, so you basically have to slow down all the time, and that's annoying.

    I try to keep a consistent speed, usually 6-9 over. They nabbed me for 11 over, which is lame since the limit is set artificially low. It's a 3 lane road where I was fined, 3 lanes and 35mph?!
  • So I just test drove both a 2.5X Limited and a 2.5XT Limited. Sigh. Is it my imagination or is the 2.5X underpowered? I'm coming off of a Honda Odyssey and I really don't want a dog of a car. (I really want a car not an SUV, but we have so much &*#^%$* snow here in Rochester NY that I know I'll regret buying a regular car.)
  • robm2robm2 Posts: 53
    The XT Limited has the proper amount of power for that chassis, and that transmission. You're not imagining anything.
  • You can get good mileage in the Turbo if you're "easy" with the throttle. Highway driving helps - On freeway, I've hit 27.5 mpg in my '09 XTL :) . But what is nice about the XT is: When you need to accelerate, it does.

    Also, you can help minimize engine and turbo wear by simply letting the car idle 15 - 20 seconds after starting, before you drive off.

    Finally, there's a reputable oil additive around, ASL Camguard (web search will find it). Although promoted for aircraft, its maker shows it helps prevent oil burning and deposits in any engine, especially ones with turbochargers. The maker is considering making a version specifically for autos - why not email or write them if that sounds interesting?
  • ateixeiraateixeira Posts: 72,587
    Try a PZEV model, which has 175hp.

    I don't find ours underpowered.

    Power to weight is 3360 lbs / 175 hp = 19.2 lbs per horse.

    What Ody do you have? For the 08 it's 4385 lbs and 244hp, so 18.0 lbs per horse.

    Fairly similar IMHO.

    The XT's is 14.2 so it's in another league.

    Your Ody should feel more like the Forester X, though.
  • My XT got 33 MPG on the highway today on a 30 mile stretch. When I got off the highway, it dropped to 27. I am learning the "art" of getting better gas mileage on this car. I've talked to many people who swear they can match the MPG of non-turbos. I'm not there yet, but definitely getting better. Easing on the accelerator at lights (and in general) helps MPG dramatically. I agree with the poster who said the 2.5X seemed underpowered. But hey, less power to anyone who finds that it works for them! I really like having the option of more power when I need it and for mountain driving. I am also convinced that the turbo runs smoother and quieter than the non-turbo. Thanks for the information regarding the oil additive. I'm going to do some reseach on it.
  • ateixeiraateixeira Posts: 72,587
    It should mellow out the exhaust, that's true. Driven hard you'll hear the blow-off valve, though, so it really would depend.

    The turbo is geared taller so I can see how it could potentially do better, but in practice the non-turbos are getting several MPG higher averages.

    I looked it up - the final drive on the XT is 8.1% taller. The 4 ratios on the automatic are the same, so on the highway it should rev 8.1% lower at a given speed compared to the X Limited, which has the same size tires. Off boost, in theory it would use less fuel in steady, flat cruising.

    In practice, unless you have cruise control on and are driving on a totally flat surface with zero traffic, I doubt that's the case.

    The hood scoop alone increases aerodynamic drag at highway speeds, plus it's 100 lbs heavier. Though come to think of it, once up to speed I don't think the weight is a factor. It's the slowing down and then speeding up, the latter which the XT does at a higher rate, that would hurt your real-world MPG.
  • paisanpaisan Posts: 21,181
    It should mellow out the exhaust, that's true. Driven hard you'll hear the blow-off valve, though, so it really would depend.

    Unless there is something wrong with your stock BOV, you should never hear it. The Subarus use a recirculating BOV and the air isn't released it's fed back into the system, so there is no tell tale BOV sound.

    -mike
  • ateixeiraateixeira Posts: 72,587
    Is that right? Cool.

    I guess I've heard so many aftermarket BOV applications that I thought they all made the noise! :D
  • paisanpaisan Posts: 21,181
    Been hanging with the yungins again juice? :)

    -mike
This discussion has been closed.