Kia Transmission HP Limits
- Thread starter Dmidify
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Bear
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Transmissions are based on torque and not HP, but from what I’ve heard it’s around 600-800 ft lbs.
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eflyguy
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Someone observed that the typical engine weak points were "over engineered" for the stock numbers, but nobody has posted information on the transmission.
I have no technical experience with A/T, but note that many vehicles which support towing of significant loads don't have different service intervals for their transmissions, although many have better cooling systems. This has me wondering if perhaps there would be little impact on transmission longevity in "everyday use"..
I have no technical experience with A/T, but note that many vehicles which support towing of significant loads don't have different service intervals for their transmissions, although many have better cooling systems. This has me wondering if perhaps there would be little impact on transmission longevity in "everyday use"..
Sensibly Spirited Driver
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I'm curious what the top speed would be if the 167mph governed limit was removed. I'm also curious if that limit was put on for safety or for structural reasons.
Dmidify
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It's likely structural considering all the production cars that go well beyond that limit.
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Snicklefritz
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Same gearbox. It is KIA's in-house transmission, used on a lot of other models over the years. That's what I've read. And they don't blow up except in a handful of cases. Reports of transmissions failing have been very rare on the forum.
At about 9:27 in this video, he's doing 270kph / 167mph at 5000 rpm. That implies a gear-limited top speed of 217mph at 6500 rpm. Or, if you assume peak power will stay at 6000rpm when you tune it, that should be right at 200mph.
However, if I plug the gear ratios into the below calculator, it looks like he was in 7th (it shows 170mph at 5000, and 222mph at 6500, close enough). So 8th gear would hit 253mph / 409kph.
Vehicle speed calculator
Calculate your vehicle’s top speed in each gear by entering the gear ratio, engine RPM, and tire size.
motoristo.com
One of the big auto sites used to post mph per 1000rpm in top gear I found useful for highway cruising. I can't find that for the Stinger but remember about 2200rpm at 80mph (above calculator shows 78mph at 2000), consistent with ~253mph at redline.
Guzman
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I assume the top speed would be drag limited at not much faster than the limiter. First off, the we have no idea how accurate the speedometer is in that video at that speed. Much more powerful cars have drag limited top speeds below 200 mph. The one that comes to mind is the 2013-14 Mustang GT500. Ford claimed it was a 200 mph car and Car and Driver could only get a two way average of 189 mph. If a 662 hp under 3900 lb car can't get to 200 mph, then the Stinger never will. The regular C8 Corvette has a drag limited top speed of 187-194 depending on wing or not. Again, more powerful and lighter....can't get to 200 mph.At about 9:27 in this video, he's doing 270kph / 167mph at 5000 rpm. That implies a gear-limited top speed of 217mph at 6500 rpm. Or, if you assume peak power will stay at 6000rpm when you tune it, that should be right at 200mph.
However, if I plug the gear ratios into the below calculator, it looks like he was in 7th (it shows 170mph at 5000, and 222mph at 6500, close enough). So 8th gear would hit 253mph / 409kph.
View attachment 87763
View attachment 87764Vehicle speed calculator
Calculate your vehicle’s top speed in each gear by entering the gear ratio, engine RPM, and tire size.
One of the big auto sites used to post mph per 1000rpm in top gear I found useful for highway cruising. I can't find that for the Stinger but remember about 2200rpm at 80mph (above calculator shows 78mph at 2000), consistent with ~253mph at redline.
Oh we're definitely power limited, I was just curious how close we were to running out of gear (given 170mph @ 5000rpm) before realizing that was 7th gear, making it moot.
I'd wager our car is more aerodynamic than the GT500, but not sure vs. the C8 (it's lower and mid-engine, but no idea how much downforce). There's tons of data on the relationships between horsepower, weight, 1/4 mile ET, and top speed, so we should be able to guess what the Stinger needs to hit 200.
Below is a simple calculator that predicts new top speed from old & new horsepower. If the stock Stinger were aero/power limited at 170, 500hp would get you 188mph. If it can hit 180 stock, 500 horsepower should be knocking on the door of 200.
