How bad is it to hit the rev. limiter?

Discussion in '2005 - 2014 S-197 Mustang -General/Talk-' started by GreyDiesel, Nov 7, 2009.


  1. GreyDiesel

    GreyDiesel New Member

    Joined:
    Jul 26, 2008
    Messages:
    172
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    Denver, CO
    I have hit the limiter a few times, and it feels horrible. Afterwards I have this nagging feeling that I broke something. My is set relatively low, 6500, and I hear I can bring it to 6700 no problem. And, if you go to the track, sometimes you see 4 bangers hitting the limiter at the line before launch. And I mean, not an accidental one time tap, they are just railing on it. Does it hurt the engine to hit the limiter?
     
    #1
  2. wusthof

    wusthof Member

    Joined:
    Nov 20, 2007
    Messages:
    190
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    BC, Canada
    better not, I hit mine @ least twice a week lol
     
    #2
  3. BackinaStang

    BackinaStang New Member

    Joined:
    Oct 12, 2009
    Messages:
    23
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    East Coast
    Yeah I think i hit mine 3 or 4 times today! Its there to keep you from over revving. So its safe to hit it but does suck when you do:lol:
     
    #3
  4. imfamousjim

    imfamousjim Member

    Joined:
    Mar 13, 2009
    Messages:
    32
    Likes Received:
    0
    Trophy Points:
    7
    remind me not to buy your car when you eventually sell it hah
     
    #4
  5. 40th GT

    40th GT New Member

    Joined:
    Apr 7, 2004
    Messages:
    934
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Lawrenceville, GA
    I'm just going by what I hear and see but drag racers with 2-step/3-step rev limiters bounce on their limiters for ~5 seconds before launching. So it can't be that bad?
    It also depends on how the limiter is limiting the engine. Fuel cut = bad, spark cut = not bad.
     
    #5
  6. walter

    walter Founding Member

    Joined:
    Aug 13, 1998
    Messages:
    1,068
    Likes Received:
    0
    Trophy Points:
    46
    Location:
    Houston TX
    +1 to that.
     
    #6
  7. BackinaStang

    BackinaStang New Member

    Joined:
    Oct 12, 2009
    Messages:
    23
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    East Coast
    they would never cut the fuel to limit over rev. its an ignition deal so it kills spark. And this baby will never be for sale
     
    #7
  8. Don 95Vert

    Don 95Vert Founding Member

    Joined:
    Oct 1, 1999
    Messages:
    1,091
    Likes Received:
    1
    Trophy Points:
    39
    Location:
    Delaware, OH
    Ford and other manufacturers use fuel cutoff rev limiters for emissions purposes. There is so little fuel present that there is not enough energy to hurt anything - cylinder pressures are pretty low - so fuel cutoff rev limiters are not bad. One of the tests Ford does on cars it to take it on the test track and run it on the limiter for 30 minutes. I do not suggest you do that - because it's not totally harmless - the rapid speeding and slowing of the rotating assembly is not great for parts and that happens no matter the method of rev limiter.
     
    #8
  9. Gearbanger 101

    Gearbanger 101 Straight Outta Locash Super Mod

    Joined:
    Aug 11, 2002
    Messages:
    14,495
    Likes Received:
    951
    Trophy Points:
    164
    Location:
    Ontario, Canada
    I can't speak for the S197's, but cutting fuel is "exactly" how Ford did it with the '87-'04 cars. You had to by an aftermarket ignition box like a MSD 6AL or the like if you wanted the "soft touch" limiter that cut spark instead.
     
    #9
  10. GreyDiesel

    GreyDiesel New Member

    Joined:
    Jul 26, 2008
    Messages:
    172
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    Denver, CO
    great info guys, thanks. :nice:

    I am not going to feel so bad for hitting the limiter now.
     
    #10
  11. GOLDENPONY

    GOLDENPONY Founding Member

    Joined:
    Jan 23, 2002
    Messages:
    1,503
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    LOVELAND, OHIO
    Shouldn't be a big deal, I just wouldn't make a habit of it. :nono:
     
    #11
  12. autumn_again

    autumn_again New Member

    Joined:
    Oct 3, 2007
    Messages:
    365
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hamilton, NJ
    i've heard bad things about running spark cutting limiters with cats though. people using the MSD 2 step and fouling their cats.

    if i foul mine they are coming off and staying off, so it wasn't a big concern of mine. but for those looking to keep theirs they may want to keep it in mind.
     
    #12
  13. DarkFireGT

    DarkFireGT Playing with my wife's really makes me want one. Mod Dude

    Joined:
    May 23, 2004
    Messages:
    2,688
    Likes Received:
    7
    Trophy Points:
    59
    Location:
    Davenport, IA
    It's not necessarily bad, on a N/A car, but not something you'd want to do constantly. On a F/I car, it's a big no-no, because Ford's rev limiter cuts fuel, which causes a lean condition. If you're NA, it won't be a big deal, but if you're FI, that could blow the engine.

    The reason you see drag racers do it is because they use aftermarket rev limiter boxes, which cut spark. The only bi-product of that is maybe a small fireball. But it's not harmful to the engine.
     
    #13
  14. walter

    walter Founding Member

    Joined:
    Aug 13, 1998
    Messages:
    1,068
    Likes Received:
    0
    Trophy Points:
    46
    Location:
    Houston TX
    By that logic shouldn't it harm N/A cars that have been tuned be also susceptible to blown engines because of the leaning of gas and advanced timing?
     
    #14
  15. BackinaStang

    BackinaStang New Member

    Joined:
    Oct 12, 2009
    Messages:
    23
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    East Coast
    Wow, I looked into that fuel/spark issue and you guys are absolutely right the fuel is cut, that blows my mind and makes me wanna install a shift light in the car. I always ran a MSD box on the foxes and relied on the limiter on that and thought all limiters were based on the same concept. Boy was I wrong!!!:D
     
    #15
  16. Don 95Vert

    Don 95Vert Founding Member

    Joined:
    Oct 1, 1999
    Messages:
    1,091
    Likes Received:
    1
    Trophy Points:
    39
    Location:
    Delaware, OH
    No one read what I posted I guess - the fuel is cut so much that it goes so lean there is not enough energy available to hurt anything. And as I said, Ford tested ALL their cars (GT500's with blowers, Ford GTs with blowers, Lightnings with blowers, 03/04 Cobras with blowers and I assume Ecoboost turbo motors) by holding them on the limiter for 30 minutes. Doubt anyone with a street car would do that a lot.
     
    #16
  17. autumn_again

    autumn_again New Member

    Joined:
    Oct 3, 2007
    Messages:
    365
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hamilton, NJ
    i think darkfires mainly leaning towards aftermarket forced induction cars where they are tuned towards performance, not daily driving.

    i've seen several posts where people are running nitrous the car runs lean for some reason [mainly the zex kits just spraying straight nitrous and no fuel to compensate] nitrous backfire and a giant fireball. i know thats different from hitting the limiter but they are both cutting fuel in some odd way with bad consequences. not sure the problems you can run into with a turbo or supercharger, but that was just one example.
     
    #17
  18. Don 95Vert

    Don 95Vert Founding Member

    Joined:
    Oct 1, 1999
    Messages:
    1,091
    Likes Received:
    1
    Trophy Points:
    39
    Location:
    Delaware, OH
    Nitrous + Rev limiter IS very bad - that does not apply to what I said - there is a LOT more energy present. Always set the window switch below the rev limiter.
     
    #18
  19. sbreaux26

    sbreaux26 New Member

    Joined:
    Aug 21, 2001
    Messages:
    47
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Baton Rouge, LA
    LOL, yeah really. I hit mine bye accident a few times. Usually becuase I have the radio to load and I forget about it....:rlaugh:
     
    #19
  20. DarkFireGT

    DarkFireGT Playing with my wife's really makes me want one. Mod Dude

    Joined:
    May 23, 2004
    Messages:
    2,688
    Likes Received:
    7
    Trophy Points:
    59
    Location:
    Davenport, IA
    Sorry, I should've specified. I was tired. Yes, I meant nitrous, though it wouldn't be good with a radical race setup on a SC or Turbo either.
     
    #20

Share This Page