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How to remove (increase) the speed limiter?

Discussion in '2019-2020 Bullitt Mustang' started by npole, Jul 12, 2020.

  1. npole

    npole Well-Known Member

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    Hi everyone, tried to search the forum for the (subject) simple question, however I couldn't found a direct answer, so here's the question: I live in EU, on certain roads here there's no speed limits, I would like to remove (increase) the 260 Km/h limit on my Bullit (that I can reach in 4th gear), I'm using 105Y wheels so there shouldn't be any issue (assuming the tranny will do good), is there any "simple" (cheap/inexpensive) way to do so?
    I'm not interested of any tuning or such, so I'm trying to avoid to buy a dedicate interface or custom tune, is there a way to change the parm in the stock ECU or I still have to buy the whole custom tune?
    If i've to buy a custom tune, what's the most cheap solution I could have here in Europe to just override the speed limiter?
    Thank you!
     
  2. el-guapin

    el-guapin Well-Known Member

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    Unfortunately, tuning is the only way. You gonna need an interface like Ngauge or SCT. A tuner can then email you a custom tune.
     
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    npole

    npole Well-Known Member

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    Gotcha... Thanks for the confirming. I hoped that I could have used a "Chinese" OBD2 interface to download the original firmware, modify it and up it back like my other cars. :)
    If that's not the case I will go for a custom mod... now to decide (find) what's the cheapest option available in EU as I'm not interested in any specific tune except the limiter removal (increase).
     
  4. Elp_jc

    Elp_jc Well-Known Member

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    Just as an FYI, if you mess with the ECU, even to just remove the speed limiter, you'd be violating its electronic seal, and could possibly void your powertrain warranty, so I'd think twice before doing that. Furthermore, you need to find out if our drive shaft is also up to the extra speed. The MT-82, Torsen, and half-shafts, shouldn't be an issue, but it wouldn't hurt to check too, just in case. Good luck.
     
  5. BlackandBlue

    BlackandBlue Well-Known Member

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    I don’t know how much there is left on the table. Might be able to get to the high 170s with plenty of German road.

    I would worry more about aero problems at higher speeds. I would want a body pan and a better spoiler and splitter. Lowering would also make a huge difference. Those mods alone could prob get you into the 180s pretty easy.

    Tune it and report back on your top speed. Us losers of here can’t play like over there.
     
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    npole

    npole Well-Known Member

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    I've seen GTs (and Bullitt) going for 173mph reaching the limiter in 4th (that is how they are rolled..) with unlocked speed limiters, the car IMO can perform much higher than this (while maintaining an acceptable level of security), I find odd that to have two resting gears above the 4th.. if it was a matter of speed they could have changed the gear ratio, leaving only the 6th as spare one.
    The power train should be OK, I don't want to increase the hp/torque so the MT82 would sustain only a limited increase of rmp's (imagine when shifting to 5th and 6th.. you gonna have less rpm but higher speed if it wasn't for the limiter).
    The only concern I have is about the aero indeed, and I have no reference about it: it's very strange that I couldn't find a reference (video) of anyone going at top-speed here in EU with a speed limiter removed, I would have expected so many "crazy" people attempting it... I don't wanna be the first! :D
     
  7. Elp_jc

    Elp_jc Well-Known Member

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    That's a very good point too, especially without a rear spoiler. But it's something you feel right away, and just cut it off if car starts feeling unstable. I remember trying to top out my first Corvette, a 2003 C5; it felt like it was falling apart at 150, not to mention like it wanted to flip over, so I just aborted the 'joy' ride :D.
     
  8. BlackandBlue

    BlackandBlue Well-Known Member

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    The gearing was done only for EPA mileage to try to keep the guzzler ax to a minimum. Zero other reason. The 17 trans has much better gearing for performance but not gas mileage.

    These cars are extremely aero dynamic. The 2014 gt500 was designed to run up to 200 but was an aero brick compared to these s550s. Really just want to limit the air under the car with lowering, a splitter and belly pan. I think the PP1 uses a good size belly pan.

    There are a few guy that do 1/2 mile and 1 mile stuff on here so I’m sure there is some good info there.


    Just reading that made me cringe. I had a 1996 Gt and I ran it up much faster than I should a few times with not problem, then finally one day I must has hit a bump wrong and got the front end up a bit. It started porpoising and scared the he’ll out of me. Those cars were death traps. The front end was shaped like a wing. It’s crazy how stable these cars feel at speed now compared to the old days.
     
  9. jonny10buds

    jonny10buds Well-Known Member

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    I have a vague recollection of a Road & Track article from about 20 years ago where someone tried to get a Gen 4 Camaro up to 200 mph, I can’t remember all the details but I think it was on a salt flat, the aerodynamics of the car weren’t right for that kind of speed and at about 180 mph the car swopped ends and ended up on its roof, I believe the driver survived, does anyone else remember this story?
     
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    npole

    npole Well-Known Member

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    Ok guys.. but leaving theories apart, how's possible that none with a *stock* Bullitt (or a GT PP1) and the speed limiter removed didn't tried the top speed (on road) yet? That's the strange part I couldn't figure out...
     
  11. Schwerin

    Schwerin Well-Known Member

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    Someone may have, just not some one that visits this site. It's also not easy to find a stretch of road empty enough to try it on. Even if it was its likely not very flat. I'm sure I could try it on Interstate 95 at like 1AM, but there are potholes and bumps all over it due to crap patching by road crews.
     
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    npole

    npole Well-Known Member

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    Ye, I mean in general (on the web). I've found only two videos of a Bullitt tested on the autobahn, one from a famous youtuber (autopNL), ironically he's hitting the limiter at 260 km/h in 4th gear as expected :) As you can see from that video it isn't that hard (nor illegal) to find a good road to test it out. Maybe one day...
     
  13. cosmic charlie

    cosmic charlie Well-Known Member

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    You would need to tune the car to remove the limiter. That could get you to 183mph. The PCM is hard coded at the factory and limited to 183mph which can't be changed. I would think Steeda Europe could help you with an SCT tuner (which also comes with lifetime tunes if you want to add anything else later).

    https://steeda.eu.com/collections/mustang-s550-gt/products/steeda-tunes-for-life
     
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    npole

    npole Well-Known Member

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    I've looked at Steeda EU, here I can access only to 95 and 100 octane fuel (that is the equivalent of about 91-93 in the US) so i'm not sure of what I could get from a custom tune with a stock Bullitt, so investing 600€ seems a little over the boundaries in my case (as I don't plan to add any modification to my car) ... but if that's the only way to have the speed limiter reprogrammed, I'll eat it.
     
  15. cosmic charlie

    cosmic charlie Well-Known Member

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    Take a look at this. (Steeda USA) Note the video. James is one of the premier S550 tuners. The tune itself would certainly wake the car up. Removing the limiter would be a plus. I would think this is available through Steeda Europe.

    https://www.steeda.com/sct-7015-b-bullitt-tune
     
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