Stinger 2.0 vs Sportage 2.0 - Kia Forum

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post #1 of 14 (permalink) Old 05-08-2018, 03:12 PM Thread Starter
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Stinger 2.0 vs Sportage 2.0

The new Stinger 2.0l Turbo provides an interesting data point for comparison to the Sportage 2.0l Turbo in the context of fuel octane required for the two engines.

KIA specifies 91 octane premium for the Stinger, rated a 255 hp at 6200 rpm vs 240 hp at 6000 rpm for the Sportage which they want you to believe only requires 87 octane regular. Both engines produce the same maximum torque value of 260 lb/ft

So lets examine the respective torque outputs of those two engines at their power peaks.

hp=torque X rpm / 5252. So to solve for torque we can re-arrange that equation to torque=hp / rpm X 5252

so for the Stinger's torque we have 255hp / 6200 X 5252 = 216 lb ft at 6200 rpm to produce that 255 hp

for the Sportage's torque we have 240hp / 6000 X 5252 = 210 lb ft at 6000 rpm to produce that 240 hp.

So the Stinger produces a mere 6 more lb/ft (albeit at 200 higher rpm) than the Sportage. That represents only a 6/210X100= 2.85% increase in output over the Sportage. Less than 3%!

Both engines have 10.0:1 compression and I would wager they are operating under the same amount of boost. The difference is almost certainly a result of slightly more efficient intake and/or exhaust tuning and maybe a little ECU timing to take advantage of it on the Stinger as that could easily pick up 3% in output.

So why do they recommend 91 octane in the Stinger over the 87 for the Sportage? i think there are a couple of reasons, mostly marketing and less so engineering.

The demographic for a Stinger purchaser would be much more inclined to accept the fact that their new sports car requires premium fuel. The demographic for a Sportage purchaser, maybe not so much. So KIA fiddles a little with the ECU tuning on the Sportage to do their best to get by tuning it to run acceptably on 87 octane to satisfy the marketing people. With the Stinger, they are under no such constraint.

Now, considering that, with only a 2.8% increase in torque to produce the Stinger's hp output they decided on 91 octane (because it would be much easier to "get away with it"), that would tend to indicate that the Sportage, producing less than 3% as much power, is likely running much closer "to the edge of detonation" on 87, so to speak, than the Stinger is on 91.

So finally, given the Sportage is closer to that edge, should you come upon regular fuel that maybe isn't quite 87 octane (has been known to happen) it might just be enough to push you into the plug cracking and potentially other problems that Stinger engines simply won't ever see.

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post #2 of 14 (permalink) Old 05-08-2018, 05:26 PM
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Thanks - I was wondering how much HP the 2.0L Stinger has. There's no doubt in my mind that at least 89 octane will be used in my Sportage since its been working for two years. Of course the Stinger to have is the twin-turbo V6. I wonder how long its going to be before some wag calls it a 'Stinker' . These KIA haters are working overtime to come up with something bad on KIA but its hard to do. I believe if you could reprogram everything you could get 300 HP and 7000 RPM out of the 2.0L but you wouldn't want to be in the position of guaranteeing it for ten years/100,000 miles. The fact that they can guarantee the 240 and higher HP versions indicates to me a VERY conservative allowance on RPM/power. Whatever, I'm happy with mine as-is - it has more than enough power to get me into trouble.
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post #3 of 14 (permalink) Old 05-08-2018, 07:00 PM
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from the Stinger forum, the owners manual says your engine is designed to use (R+M/2 )87 or higher octane. see post #33

and atleast 12 owners use 87 octane
some owners say noticable difference in acceleration especially at WOT, but no dyno numbers to back it up
Quote:
Same experience with butt dyno when running 87 vs 93, very noticeable at WOT
some say no difference
Quote:
I've decided to go to 87. Everything seems fine. I get plenty of acceleration and no hiccups. So not sure why I would pay more.
Quote:
Based on minimum required, I changed to 87 octane. I really haven't noticed any difference in power, I hit the gas and I am at 100 before I know it.. good enough for me

https://stingerforum.org/threads/gas...3-octane.3398/

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post #4 of 14 (permalink) Old 05-08-2018, 07:09 PM Thread Starter
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Originally Posted by 191145 View Post
Thanks - I was wondering how much HP the 2.0L Stinger has. There's no doubt in my mind that at least 89 octane will be used in my Sportage since its been working for two years. Of course the Stinger to have is the twin-turbo V6. I wonder how long its going to be before some wag calls it a 'Stinker' . These KIA haters are working overtime to come up with something bad on KIA but its hard to do. I believe if you could reprogram everything you could get 300 HP and 7000 RPM out of the 2.0L but you wouldn't want to be in the position of guaranteeing it for ten years/100,000 miles. The fact that they can guarantee the 240 and higher HP versions indicates to me a VERY conservative allowance on RPM/power. Whatever, I'm happy with mine as-is - it has more than enough power to get me into trouble.
well KIA has a ways to go to meet the "Honda standard" for specific engine output.

Honda can manage 306 hp from a 2l four and while only running 9.x lbs of boost (according to C&D) and with warranty. Compare that to KIA's 240-255hp from the same engine size and using substantially more boost as well (17-18 psi in Sportage anyway, and likely something similar in the Stinger).

That Honda 4 compares favourably in specific output to the best engines in the world. Like AMG's 4.0l twin turbo V8 which produces upto 600+hp in their big sedan.

Two of those Honda 4s in a V to form a V8 would produce world class HP for that configuration, second to none really. If only they would do it.
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post #5 of 14 (permalink) Old 05-08-2018, 07:10 PM
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you can download the owners manual here, its on page 1-2 or page 6 in pdf format, recommends (R+M/2) 87 or higher (US rating, not RON rating)

https://www.kiastinger.org/forum/thr...Owner-s-Manual

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post #6 of 14 (permalink) Old 05-08-2018, 07:14 PM Thread Starter
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Originally Posted by skavatar View Post
from the Stinger forum, the owners manual says your engine is designed to use (R+M/2 )87 or higher octane. see post #33

and atleast 12 owners use 87 octane
some owners say noticable difference in acceleration especially at WOT, but no dyno numbers to back it up

some say no difference




https://stingerforum.org/threads/gas...3-octane.3398/
well that is interesting. I got the octane requirement for the 2l Stinger from the C&D road test/review of the Stinger. this implies the 3.3l is ok with 87 as well?....hmmm not what I've read in other places although its tough to argue with the owner's manual.

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post #7 of 14 (permalink) Old 05-08-2018, 07:20 PM
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yes you did read it, but must have remembered it slightly different.

Quote:
And although our testing and evaluation was done on 91-octane premium fuel, Kia says the turbo four can get by drinking cheaper regular.
https://www.caranddriver.com/reviews...wd-test-review

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post #8 of 14 (permalink) Old 05-08-2018, 07:26 PM Thread Starter
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the brochure they provide recommends premium fuel.
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post #9 of 14 (permalink) Old 05-08-2018, 07:31 PM
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Quote:
Originally Posted by Sloppy View Post
the brochure they provide recommends premium fuel.
i don't doubt that, the brochures are more from the Marketing department rather than from the engineering dept.

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post #10 of 14 (permalink) Old 05-09-2018, 01:23 PM
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Generally speaking, engines that recommend but do not require premium fuel will generate slightly lower hp on 87 octane fule than they will on 91 octane. Some will also give slightly lower peak torque values. Generally the difference is not enough to detect unless you're doing timed 1/4 mile runs or something. I would guess that the Stinger and Sportage use the same engine, and the different hp and torque values are due to a combination of the different recommended fuel octanes, as well as possible intake, exhaust or ECU differences.

It's also possible that the engines are exactly the same, and Kia just publishes slightly lower figures for the Sportage because, hey, if I'm buying a Stinger, I obviously want performance and won't be happy if the lowly Sportage has the same bloody performance, right? Kia would not be the only auto manufacturer to do this, if it is indeed the case.

Last edited by Zathras; 05-09-2018 at 01:43 PM. Reason: spelling
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