Just upgraded from 1999 XLT to 2017 Platinum....questions

Discussion in '3rd Gen - 2007 - 2017' started by westinman, Dec 5, 2017.


  1. J Ski

    J Ski 3.5plati

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    Rev limiters, turbo spooling, flooring it,??? these aren't Honda S2000s folks. They are tanks, not gonna fly. I feel like ppl who complain about the lag in the turbo don't fully understand that enough pressure has to be built to get them turning. Not gonna happen quick in a 6,000lb vehicle pushing probably 315hp at the wheels. Just enjoy what its got and treat it right
     
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  2. Adieu

    Adieu Full Access Members

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    Its not THAT diffferent, you know....

    S2000:
    237 hp and 2800 lbs = 11.8 lbs / hp

    Expedition:
    365 hp and 5600 lbs = 15.3 lbs / hp



    Yeah yeah theres aerodynamics too I guess.... still
     
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  3. chuck s

    chuck s Full Access Members

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    Did someone (else) mention the S2000?! :mwah1:

    Those are peak power ratings. Driving and acceleration take place much lower in the rev range. Be interesting to compare the torque curves. I know my '07 5.4 V8 had a pretty flat curve. The 3.5 V6 feels very much stronger.

    After tuning my S2000 (AP2 engine) revs so fast in the lower gears I installed an audible red line alarm. VTEC is now at 3,600 vs 6,000 rpm so she's on the high power cam immediately. I'm getting 221bhp (peak) at the rear wheels on a conservative Mustang dyno. These are reputed to read 10% lower than others.

    Bumping the rev limiter still startles me. Literally frightened me the first time! Not had it occur on the Expedition but I suspect the automatic transmission is keeping me safe.

    -- Chuck
     
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  4. jeff kushner

    jeff kushner Full Access Members

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    Congrats on your new 17! I'm right around 28,000 miles on mine, bought LAST Nov and have never seen a check-engine light. Something my friend, is amiss!

    You will def want to track the cause & code. The code can be had with less than a 5 dollar outlay for something like this....

    https://www.ebay.com/itm/Mini-OBD2-...ash=item25cdb72dea:g:lQgAAOSwo4pYZxtn&vxp=mtr

    Well, they were 3.99 when I bought 5 last summer. I've given 3 away to friends and they do work....once armed with the codes, we can help you track the cause PRIOR to going to the dealer so you'll know if smoke is being injected into your rump.

    One minor correction to something I read in this thread....most damage to a CC occurs when the mixture is too rich. In fact, if you want to frag a CC, disconnect the spark plugs from 3-4 cyl and inject raw fuel into it.....they do catch fire but that's the result of blockages, usually from running rich.

    Overcome ALL lag by shifting manually......if it's not crisp, something needs love, prob a recalibration of the Throttle body. It happens in my supercharged car occasionally. A calibrate and its back to leaping out from under it's body again!

    jeff
     
  5. knewblewkorvett

    knewblewkorvett Full Access Members

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    I totally agree, a turbo is run by the exhaust and a centrifugal supercharger is run by a belt. Your statement of "Turbochaged engines need the supercharger to spool up to pressure for maximum power" makes no sense at all. A turbocharger has two fans, a turbine wheel and a compressor wheel. No part of a turbocharger is called a supercharger.
     
  6. Muddy Bean

    Muddy Bean Full Access Members

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    In answer to an earlier query, yes it did stumble and lose power when the CEL started flashing on my ‘15. It’s done it twice now but it always goes away on its own in a matter of minutes.


    Sent from my iPhone using Tapatalk Pro
     
  7. B-McD

    B-McD Full Access Members

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    I've had this on other cars in the past and sometimes it was "fixed" by trying a different gas station and brand. If you had just a bit of water or something in the gas you could get that issue. And I don't know if it's urban legend but I was told never fill up if the tanker is there filling the underground tanks. Supposedly stirs up the sediments in the bottom of the tanks. Who knows but to this day I drive past if the truck is there. Good luck with the issue!
     

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