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Toyota Tundra Problems



  • ak4x4ak4x4 Posts: 126
    LAEMT: I was admitting to my mistake. Seeing as I have a 4.10 gear ratio I did not know that Toyota did not offer this option until yesterday. I was comparing it to mine. So My truck has more while the others with different gearing have less. Yes In Rain, or ICE conditions a 4 wheel drive will provide better traction and power to what you are hauling. The thing that makes the Tundra hard to compare to to any other 1/2 ton is the fact that the HP is less but the torque is more. The Chevy 5.3 only puts out 300. But where the torque prevail HP does not. I wold like to see the how the Tundra would do against any 1/2 out there. Any mag or net articles??

    TROJANMAN: You say this:4x4s put less power to the ground, that's partly why the 4x2 can tow more, assuming there's no rain, ice or mud. Cars and trucks loose power through their transmissions, a 4x4 has 2 transmissions so they loose more power. Also, 4x4 adds weight, also cutting down on towing capacity.

    "Assuming" what if there is rain, or ICE??? Yes the 4x4 adds weight. But consider this if it does add weight which it does,then in rain or ice conditions the 4x4 is putting MORE power to the ground. 4 wheels are getting traction in any condition correct?? Yes the full HP and torque is
    Mainly going to the rear, but you still get a bit of power in the front.

    NDHAL: and BamaTundra. I posted Toyota's number to call. I suggest you guys call it.

    BAMA and NDHAL:Bama if you were running forged pistons from an engineering standpoint you would have more HP and Tourque then anyone else. NDHAL is correct and I will stand by his Cast statement. If yours is indeed different for some reason(It might be) You may have somethng special. It's just the way you react that put's me in doubt. If anyone remembers the Acura type-R the pistons were polished to a mirror finish. This increasedHP to 195HP from 170HP. Just think of that example..
  • modvptnlmodvptnl Posts: 1,352
    Where do you get your wacked info????? Forged pistons in and by themselves cannot add horsepower. Forged pistons will take more abuse for power adders and such but they don't magically add horsepower.

    Polishing pistons may help alleviate hot spots and deter detonation or pre-ignition but it's highly unlikely they'll magically add horsepower. The R's have different compression ratios, cam timing and a host of other features that increased the horsepower.

    Your 4WD statements are still ignorant. If you want to say that towing in 4WD during icy or wet conditions may be safer, we might accept that. Stop saying it's because of the power or whatever BS you keep trying to save face with. The bottom line is exact equipt trucks where the only diff is 2 or 4WD, the 2WD truck is rated to tow MORE. It has nothing to do with the less power output from the 2 transmissions as someone else mistakingly said.
  • modvptnlmodvptnl Posts: 1,352
    I have not been at it for 10 years but from what I've seen your opinion seems to be very subjective(that would be S on the SOAP chart)

    There was an accident a few weeks ago that killed 2 women in their Camry where the truck that T-boned 'em was barely doing 20MPH. I've seen all brands where nobody should of lived and people walked away. It is impossible to predict the type of impact that will cause the injury.
  • ak4x4ak4x4 Posts: 126
    Bad day at Burger King?? Yes compression does play a role in it, but I think you need to go learn something about cars. And as far as you say "May" be safer?? Take your Tundra out in the rain or Ice and put a trailer up to it. You'll se that on Ice and rain the rear wheels lose grip. More so on Ice as in Rain. But let me guess, you have some sort of "Magic Tundra" that the rear wheels don't slip in those conditions. If you have that, then you just outperformed every single rear-wheel drive car and truck out there. And I never claimed any answer to the question buddy. Since the head service techs at Toyota don't know the answer. I would advise you to put your Tundra in a garage and sit on is for a while. Since your truck does not slip in rain or ice at all. Funny alot of other Toyota and big 3 owners would disagree with you.
  • modvptnlmodvptnl Posts: 1,352
    Are you TRYING to say????

    You said earlier that a 4wd has a higher tow rating than a 2WD. After nearly EVERYONE on this board told you you're FOS you CHANGED it to some song and dance about snow and ice. I don't tow in snow and ice, don't know what it looks like, could care less. Gee Wizz, Wally, a 4WD will tow more on a sandy beach too! I guess it's settled, 4WD is rated higher. The ratings of the vehicles speak for themselves. Just admit you're wrong.

    Your "polished piston and forged piston adding power has to be one of the most ignorant posts (of many) you've ever posted. Now you're gonna come back with, "polished pistons in snow create more power."

    Dude, you're over your head when it comes to car knowledge. Just kick back and learn a few things and try to be humble when you're wrong instead of making scenarios up.
  • You pretty much just re-stated what I said
  • For your piston problem, I offer a direct quote from the review of the new Acura Integra type-R -- "When you run the gutsy Type R to 8,000 rpm, just short of its 8,500-rpm redline, it delivers a street-racer worthy 195 horsepower, mostly due to its hand-polished intake and exhaust ports and a high-flow exhaust system." -- I see comments regarding intake and exhust ports and a high flow exhaust system, nothing about forged or polished pistons. Forged pistons do not give an engine more power than cast pistons. However, they can withstand more power and higher cylinder pressures than cast pistons as they are stronger. An engine with say . . . 150,000 miles on it with forged pistons might put out SLIGHTLY more power than a comporable engine with cast pistons besause they are more durable and will not wear out as quickly.
  • modvptnlmodvptnl Posts: 1,352
    Good post. He confused polished intake with pistons!!! Oh well.

    I'll respectfully disagree on cast vs forged on longevity. A forged piston will take more abuse BUT is USUALLY set up a little looser than a cast piston. In a truck application I believe a forged piston will withstand higher stresses due to extra heat from towing or pre-detonation and other outside forces but a cast piston being tighter to begin with will not wear out any faster. A cast piston is more susceptible to pinging and damage but it may actually last a tad longer, if not abused, due to the tighter original clearances.

    As far as the Tundra is concerned, my guess is that it runs cast pistons for one main reason. It is an LEV motor and the tighter to begin with tolerances actually contribute to this(another long explanation)

    As far as 4X4 vs 4X2 and towing, I'll give odds that the EXACT difference in towing is EXACTLY the curb weight difference of the 2. With the 2WD obviously having the higher rating.
  • I will agree that its very difficult to predict impacts vs. injuries, but that wasn't what I was commenting on. My post and opinion may seem subjective, but it's based on my experiences with all makes of autos/trucks over many years times in many different areas. Im not predicting a thing, im taking into consideration 10 years of real world experience. The numbers may agree or disagree, but I've never been a number cruncher.

    I wasn't a Toyota fan many years ago to start with. I found it easier to work on GM stuff especially Chevy, at least from a mechanics standpoint. Over many years time, I was able to observe/dismantle many makes of autos and formed my opinions accordingly. I still prefer workin on GM/Chevy products for the most part. Although over the years, I've come acustomed to Toyotas reliability and overall performance. I took into consideration what I was seeing on the fire engine everyday and formed my opinion from that, not other way around. That is why I favor Toyota. I have seen the overall results involving safety and I choose Toyota. Yes it's very true that all makes have strengths and weaknesses, and certain types of crashes are gonna affect each differently. As a second choice I like Chevy, based on real life experiences.
  • bamatundrabamatundra Posts: 1,583
    "As far as the Tundra is concerned, my guess is that it runs cast pistons"

    I'm glad that we put all of this forged piston foolishness to rest:


    The only problem is that Ndahl will come back and STILL claim it is forged. Oh well!
  • ndahi12ndahi12 Posts: 235
    A picture!!! That is all you can come up with!!! Where doe it say that this is a picture of a CAST piston? How do you know that this is a picture of a CAST piston?

    I saw these pics on Tundra Solutions. They belong to Dude Boy and even he could not tell is they are cast or forged.

    Listen little boy, you need work on your verification skills. LMAO
  • eric2001eric2001 Posts: 482
    Take a look at the picture. See the seam? That is a cast piston.
  • bamatundrabamatundra Posts: 1,583
    "The only problem is that Ndahl will come back and STILL claim it is forged. Oh well!"

    So sad. AK - I mean NDAHL You are completely unable to admit when you are wrong. If you cannot see the casting marks inside the picture of the piston - you should not be posting about pistons.


    "I saw these pics on Tundra Solutions. They belong to Dude Boy and even he could not tell is they are cast or forged"

    Actually this is from a post Dude Boy made a year ago:

    "Toyota says it's because of "hypereutectic" pistons. "
  • f1julesf1jules Posts: 288
    Only a moron would tow something on ice. Especially, up to the limits of the truck. You would have to have rocks in your head.
  • obyoneobyone Posts: 8,065
    That's very true....

    "You would have to have rocks in your head."

    Then could be nothing in the head....
  • ak4x4ak4x4 Posts: 126
    MOd: First off I never said snow. And due to your contrasting beliefs that a 4x2 will perform better in these conditions then a 4x4 you need work.

    F1:In Alaska everyone tows in any condition. Alaska is not a regular state as it would be in your mind. Just speaking freely if you had a 4x2 in Alaska it would be a waste of your money and you should have bought the Honda.

    So the way I see your comments everyone in Alaska should have a 4x2 Tundra,ford, etc cause according to two guys on an Edmunds review board there 4x2 will be better on Slick or Ice and snow covered surfaces. Take a look you can't even mount a snowplow on the front of a Tundra!!!
  • ndahi12ndahi12 Posts: 235
    Go to this thread. I have been asking the question about cast vs. forged pistons on the Tundra and no one can give an answer even with the damned pictures. Please read beofre you snatch a pic off a board. Dude boy posted the pics and he did not once claim that the pistons are Cast.

  • modvptnlmodvptnl Posts: 1,352
    Dude, you have to be the most dense human being on this board. When have I said, "a 4X2 will perform better in these conditions then(sic) a 4X4"

    I told you I could care less about your scenario.

    The bottom line is you wrongly said that a 4WD is rated higher than a 2WD for towing. You added the slick conditions later after being proven wrong.

    YOU even posted towing figures that proved you were wrong.

    I'm sure there are no separate towing figures for slick conditions.

    Look, you've made some stupid statements. The GM antifreeze ruining the rings causing a knock had me rolling. Your polished pistons or forged pistons adding horsepower was another joke. And the fact you won't admit the RATINGS are higher for a 2WD for towing is starting to make you look, well, foolish.

    Of course you need 4WD in AK. Of course I'd rather tow in a snow storm with 4WD but the bottom line is the RATINGS give a 2WD more towing ability. PERIOD

    Now this is a question that I honestly don't know. Other than the auto trac, can you even tow on the highway at higher speeds in 4WD. I would worry about binding if it was a standard system that didn't have the traction sensing abilities of an auto system(which I believe AK said he didn't have the auto trac)

    So to sum it up(for the ??? time)

    A 2WD is rated higher for towing than a 4WD all else being equal. A 4WD OBVIOUSLY will be safer during slick conditions, towing or not. Ak, if you'll just repeat this 10X's I think you may get it.
  • modvptnlmodvptnl Posts: 1,352
    You're soooo confused now, you don't know if you're coming or going.

    Hyper pistons are CAST not forged.

    Why do keep making the statement hypereutectic are forged???
    Why are you asking these ????

    1. Are all hypereutectic pistons forged? (no, silly. none of them are)Can you have hypereutectic pistons that are cast? (Duhhh, all of them are)

    2. The author seems to suggest that hypereutectic forged piston....(author said no such thing because there is no such thing)

    actually have less thermal expansion than cast pistons. this means that you can run cylinders with less tolerances. This is the complete opposite of what is being said on this board. Here is a quote:

    "Most hypereutectic pistons also undergo less thermal expansion than conventional cast pistons which means they can be installed with somewhat tighter tolerances than conventional pistons to improve cold sealing and reduce blow-by. Closer tolerances also allow quieter operation because piston rattle is reduced."

    To his credit he does say MOST. Does that mean that the Tundra has forged hypereutectic pistons(no, the tundra does not have FORGED hyper pistons, thereis no such thing)

    that undergoes MORE thermal expansion than other similar pistons?

    Then he adds:

    "Some people think that the same thermal characteristics that allow forged pistons to run cooler also causes them to swell more as they heat up. Consequently, there’s a common misconception that forged pistons always require greater skirt-to-wall clearances. This is a notion that isn’t necessarily true because clearances depend on the type of alloy that’s used in a forged piston, the design of the piston itself and the application in which the piston will be used. Some forged alloys actually have a lower coefficient of thermal expansion than the alloys commonly used in conventional cast pistons!"

    To me that suggests that if the Tundra is using hypereutectic forged (how many times do I have to tell you they're not using pistons that don't exist)

    pistons there should NOT be any piston slap on cold start up since these types of pistons resist thermal expansion and allow you to run tighter tolerances.

    But at the begining of the article he says:

    "Piston rattle or slap when an engine is cold indicates too much clearance between pistons and cylinders. This may be due to excessive assembly tolerances or worn cylinders. Some forged pistons have a higher rate of thermal expansion than cast pistons, and may require slightly greater cold clearances to compensate. This, in turn, may produce some unwanted piston noise when a cold engine is first started, but it has no effect on piston performance, durability or longevity."

    The aonly way I can reconcile all the contradictions in the article is to believe that there are TWO types of forged hypereutectic( No, dimwit there are many types of CAST pistons with hyper being one of them)

    pistons; the ones that expand more when they heat up and the ones that expand less when they heat up. Am I correct?(HELL NO)

    If that is the case it seems that the Tundra uses the forged hyper pistons(aghhhh, That would still be NO!!!)

    that expand and that means bigger cylinder to piston tolerances are needed when the engine is cold.

    Please make this clearer for me. I really want to learn more about this. (You sure do need to learn more. How to read an article would help)

    98 SE-R, Last Of The SE-Rs
    2002 Tundra V8, 4X2 SR5

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    01-06-2002 04:16 AM
  • modvptnlmodvptnl Posts: 1,352
    Many late model engines today are factory-equipped with hypereutectic pistons. You’ll find them in Ford’s 3.0L V6, Ford’s 4.6L V8 and the 1.9L Escort engine, the General Motors 2.3L Quad 4 and the 2.5L "Tech 4" (formerly known as the "Iron Duke"). You’ll also find them in many late model Japanese engines.
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