Non- limited top speed of 2015 5.0 Ultimate

[J Dixon]

Does anyone know of a top speed test of the '15 5.0 Ultimate with the factory speed limiter removed? Or at least a theoretical top speed without it? I think it is limited to 145 mph but I'm curious what the car is truly capable of.

 

[J Dixon]

This is the only site I have found that seems to have legitimate data. They say theoretical top speed (non-governed) is 185 mph. Thoughts?

Full performance review of 2015 genesis_2gen_na offered since mid-year 2014 for North America

 

[Suburbazine]

Theoretically you’ll top out around 165-170. The car doesn’t have the power or the profile to go faster.

Mine reaches 162 but even that is creeping slowly.

 

[carguy75]

Based on horsepower and gearing, it seems it would top out at about 170-180 mph with a long stretch of highway with no governor. My governed 2015 5.0 can hit 130-140 mph easily with only about 3-4k rpm on the tachometer. I am sure that it could make it to 170mph before red line without a governor on long stretch of road, maybe 180mph downhill.

 

[skipgen]

I've only seen 110 or so - but it got there damned quick!

 

[hamed57]

Does anyone know of a top speed test of the '15 5.0 Ultimate with the factory speed limiter removed? Or at least a theoretical top speed without it? I think it is limited to 145 mph but I'm curious what the car is truly capable of.

Mine stops gaining speed at 145 mph. I assume it's limited to that.

 

[skipgen]

Mine stops gaining speed at 145 mph. I assume it's limited to that.

Yep - 145.

 

[BretL]

And how do we defeat that ECU to remove the LIMIT, without leaving a Ghost signal on the ECU?

 

[16UltV6Guy]

And how do we defeat that ECU to remove the LIMIT, without leaving a Ghost signal on the ECU?

I seriously doubt that it can be defeated.

Just curious, you need to go faster than 145mph why?

 

[EdP]

I seriously doubt that it can be defeated.

Just curious, you need to go faster than 145mph why?

Could be job related. He may drive for "Uber Get-A-Way" division.

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[16UltV6Guy]

Could be. Didn't realize they had a Get-A-Way division.

It really does suck when I have to wait for the Uber driver to show up after I rob a bank.

 

[BretL]

Because every now and then I make certain events at Airports and I've also run the Texas Mile in a my modified Porsche 944 turbo; I'd like to see what the car could do without limits but without voiding warranty.
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GM has worked very hard on the new C8 ECU unbreakable, we'll see. I really don't have to go faster than 145, I just don't like manufacturer limits. And the Cannonball record needs to broken in a couple of years LOL.

 

[16UltV6Guy]

You drive that fast without a steering wheel? j/k

Sounds like fun though.

 

[BretL]

yeah, 170 at Road Atlanta is a hoot.
No seriously, we're going to take a trip next spring/summer and part of that includes North and South Dakota (Mt Rushmore) where speeds in open spaces are sometimes "reasonable for the conditions". Driven on the Autobahn and I want to do a couple laps of the Nurburgring in a couple of years.

 

[J Dixon]

I'm just confused as to WHY these limitations even exist and the seemingly arbitrary number they arrive upon. My '15 5.0 is "supposedly" limited to 145 yet my wife's 2013 Sonata 2.0T is "supposedly" capable of 160. Lots of BMWs and MB's are limited to 155. I've heard the reasoning is about insurance and safety ratings but, let's be honest, if someone is doing 145 mph there isn't a single extra MV violation to add for reaching 170 mph that already couldn't be used.

Lastly, my interest in the car's true top speed limitation is just curiosity about the design. Is stability at speeds above 145mph a weakness that was discovered? Brakes incapable of reasonable performance? That kind of thing.

 

[BretL]

Absolutely - aerodynamics are huge - notice the splitter and the LeMans spoiler on the Porsche. The 18 5.0 is supposedly 147mph limit - Genesis Tech guy from CA, who knows. ECU are getting harder to break and if you do, some leave a Ghost image that could void warranty. I can tell you the car was absolutely stable on my trip home at 132; no yaw or sway of any kind - in one wide open space in New Mexico with nothing in front of me for just a few minutes. Bed time, working nights.
BTW, early Porsche 944t DME were easy to break with one chip change. The above engine I built, lightweight pulleys and gears, knife edged and cross drilled crank, 101,5 pistons, stage II head and more made 374/362 to the rear wheels on 18lbs of boost. Night gents.

 

[ntmehan]

Tires ya'll. You can't sell a new car that'll go 155 if you put tires on it that are only rated for 145. Hence the electronic limiter. Z rated tires are expensive (especially if you want a Z rated All Season that will perform well once the temp drops below 45F) so that's the difference between the Germans (and a few of those cars having a limiter delete option, since their tires are speed rated to handle the theoretical top speed) It's another cost-cutting measure on the part of the Koreans that I'm absolutely fine with!

That being said, I'd love someone to put some Z rated tires on a 5.0 and see what she'll do unlimited. It would further prove the engineering to some haters. Lol!

 

[carguy75]

I'm just confused as to WHY these limitations even exist and the seemingly arbitrary number they arrive upon. My '15 5.0 is "supposedly" limited to 145 yet my wife's 2013 Sonata 2.0T is "supposedly" capable of 160. Lots of BMWs and MB's are limited to 155. I've heard the reasoning is about insurance and safety ratings but, let's be honest, if someone is doing 145 mph there isn't a single extra MV violation to add for reaching 170 mph that already couldn't be used.

Lastly, my interest in the car's true top speed limitation is just curiosity about the design. Is stability at speeds above 145mph a weakness that was discovered? Brakes incapable of reasonable performance? That kind of thing.

My guess is that the current top speed rating is based on a predetermined speed limit chosen by Hyundai, because the older Hyundai cars like the old 2006 3.3 V6 Sonata also topped out at 145 mph per youtube videos. However, from what I read the 2013 Sonata 2.0T tops out at 153 mph. I guess Hyundai decided to walk the speed limit back to 145mph in 2015+ cars.

 

[carguy75]

Tires ya'll. You can't sell a new car that'll go 155 if you put tires on it that are only rated for 145. Hence the electronic limiter. Z rated tires are expensive (especially if you want a Z rated All Season that will perform well once the temp drops below 45F) so that's the difference between the Germans (and a few of those cars having a limiter delete option, since their tires are speed rated to handle the theoretical top speed) It's another cost-cutting measure on the part of the Koreans that I'm absolutely fine with!

That being said, I'd love someone to put some Z rated tires on a 5.0 and see what she'll do unlimited. It would further prove the engineering to some haters. Lol!

Well, Hyundai did governor the 2013 sonata 2.0T to 153mph on stock tires rated for 145mph. However, maybe they decided that was not smart idea for the current models.

 

[glennk]

Honestly, whom is going to go above 100 mph in a non-performance car. I can see it now, "here comes the Genesis V8 running the chicanes, slamming on the brakes and pulling out of the corner at 100mph...heading toward 120!"

Let's be serious.