Drag/Acceleration Mods to improve ¼ mile times and unofficial track thread

Ritz said:
Frankly, I'm surprised how well the drive train is handling the extra 100-150hp some of the tuners are getting.
Click to expand...
Your numbers are way off. 100s if not 1000s of Stingers are running 100hp+ with no issues. The one example of a Stinger with transmission issues has hybrid turbos, was running drag radials while using the brake switch mod for 3k RPM launches, and is actually ~250wtq(620wtq) over stock power levels.

Our drivetrain itself is conservatively rated to about 740wtq, but that isn’t accounting for 3k RPM launches & using unforgiving drag radials to seriously abuse the transmission clutches. If they used standard launch control(2200rpm) and normal tires or even slicks they could likely add 350wtq+ without any drivetrain issues.:thumbup:

FYI-Torque capacity limits directly from Kia. 1000nm/~740ftlbs of torque.:D
5280F183-9DA7-46BF-9A61-B2FF2B03B582.webp
 
Last edited:
Some goodies will be up for sale shortly......Come and get them!
upload_2019-7-23_21-36-24.webp
 
StungBlueGT2 said:
Your numbers are way off. 100s if not 1000s of Stingers are running 100hp+ with no issues. The one example of a Stinger with transmission issues has hybrid turbos, was running drag radials while using the brake switch mod for 3k RPM launches, and is actually ~250wtq(620wtq) over stock power levels.

Our drivetrain itself is conservatively rated to about 740wtq, but that isn’t accounting for 3k RPM launches & using unforgiving drag radials to seriously abuse the transmission clutches. If they used standard launch control(2200rpm) and normal tires or even slicks they could likely add 350whp+ without any drivetrain issues.:thumbup:

FYI-Torque capacity limits directly from Kia. 1000nm/~740ftlbs of torque.:D
View attachment 28362
Click to expand...

Way off? I said the guy used aftermarket turbos and was flogging it at the track. And I didn't say people were experiencing failures other than the one I mentioned (the same one you just did). Nice to know about the stated torque rating from Kia.

Best,
 
______________________________
Ritz said:
Way off? I said the guy used aftermarket turbos and was flogging it at the track. And I didn't say people were experiencing failures other than the one I mentioned (the same one you just did). Nice to know about the stated torque rating from Kia.

Best,
Click to expand...
Nothing personal but yes, as I said “your numbers are way off”, not your description of why. 250wtq is almost 3 times your 100hp example. Implying that it’s surprising the drivetrain can handle only an extra 100hp is misleading and extremely underestimating the strength of our Stingers & its drivetrain.

An extra 100hp is nothing for these cars and bet under normal conditions we will be running 700-800hp daily drivers with completely stock internals & trannys.:thumbup:
 
All the mods and upgrades for your Stinger you could ever ask for. CLICK HERE!
From interior to exterior to high performance - everything you need for your Stinger awaits you...
StungBlueGT2 said:
Nothing personal but yes, as I said “your numbers are way off”, not your description of why. 250wtq is almost 3 times your 100hp example. Implying that it’s surprising the drivetrain can handle only an extra 100hp is misleading and extremely underestimating the strength of our Stingers & its drivetrain.

An extra 100hp is nothing for these cars and bet under normal conditions we will be running 700-800hp daily drivers with completely stock internals & trannys.:thumbup:
Click to expand...

I don't think I was making any effort to mislead anyone. I am just surprised there is that much headroom on how much abuse the stock drive train can take given Kia's reputation as a "value" brand. Looking forward to seeing 700-800hp daily drivers with the Stinger.

Best,
 
StungBlueGT2 said:
Your numbers are way off. 100s if not 1000s of Stingers are running 100hp+ with no issues. The one example of a Stinger with transmission issues has hybrid turbos, was running drag radials while using the brake switch mod for 3k RPM launches, and is actually ~250wtq(620wtq) over stock power levels.

Our drivetrain itself is conservatively rated to about 740wtq, but that isn’t accounting for 3k RPM launches & using unforgiving drag radials to seriously abuse the transmission clutches. If they used standard launch control(2200rpm) and normal tires or even slicks they could likely add 350wtq+ without any drivetrain issues.:thumbup:

FYI-Torque capacity limits directly from Kia. 1000nm/~740ftlbs of torque.:D
View attachment 28362
Click to expand...
Just an FYI the transfer case is on the output side of the transmission, ergo subject to torque multiplication effect of gearing. It has to be rated at significant torque levels but It has nothing to do with the torque input capacity of the transmission. The official rated capacity of the transmission from Hyundai Powertech is barely 380 ft/lb. Alot of people have shared misinfirmation that the transmission is good for 800 + ft/lb. Those people are wrong. It takes alot of line pressure and aggressive clutches to hold that kind of power. Even if you improve the friction surfaces, you still need to tune the TCU for torque demand, line and shift pressures, and clutch fill rates to really make it live safely. Then you need to worry about hard parts like clutch and brake baskets and input/output shafts. Bottom line the trans failed right where I thought it would. They are not going to live long at 550-600 wtq levels.
 
KLR STINGER said:
Just an FYI the transfer case is on the output side of the transmission, ergo subject to torque multiplication effect of gearing. It has to be rated at significant torque levels but It has nothing to do with the torque input capacity of the transmission. The official rated capacity of the transmission from Hyundai Powertech is barely 380 ft/lb. Alot of people have shared misinfirmation that the transmission is good for 800 + ft/lb. Those people are wrong. It takes alot of line pressure and aggressive clutches to hold that kind of power. Even if you improve the friction surfaces, you still need to tune the TCU for torque demand, line and shift pressures, and clutch fill rates to really make it live safely. Then you need to worry about hard parts like clutch and brake baskets and input/output shafts. Bottom line the trans failed right where I thought it would. They are not going to live long at 550-600 wtq levels.
Click to expand...

OK, that makes a lot more sense. For comparison, the ZF 8HP90 transmission (which is significantly more stout) in the various Dodge Hellcats is "only" rated at 900Nm. That's about 665ft/lbs. Perhaps some company will fill the void with an "upgrade kit" for the Stinger trans.

Best,
 
______________________________
All the mods and upgrades for your Stinger you could ever ask for. CLICK HERE!
From interior to exterior to high performance - everything you need for your Stinger awaits you...
terrelltechsup said:
Boo I never saw these come up, I take it you sold them locally.
Click to expand...
Yes I did most of my stuff I already had sold locally before the car even sold. And most the other stuff I posted on the thread is already sold within 10 minutes. The only thing left is the Tork occ and BMS BOV Tial adapter.
 
KLR STINGER said:
Just an FYI the transfer case is on the output side of the transmission, ergo subject to torque multiplication effect of gearing. It has to be rated at significant torque levels but It has nothing to do with the torque input capacity of the transmission. The official rated capacity of the transmission from Hyundai Powertech is barely 380 ft/lb. Alot of people have shared misinfirmation that the transmission is good for 800 + ft/lb. Those people are wrong. It takes alot of line pressure and aggressive clutches to hold that kind of power. Even if you improve the friction surfaces, you still need to tune the TCU for torque demand, line and shift pressures, and clutch fill rates to really make it live safely. Then you need to worry about hard parts like clutch and brake baskets and input/output shafts. Bottom line the trans failed right where I thought it would. They are not going to live long at 550-600 wtq levels.
Click to expand...
I understand your points, but don’t believe anyone has the correct torque capacity since 380ftlbs is much lower than what stock Stingers produce.

Their are multiple dynos with stock Stingers running 385-395tq to the wheels which is closer to ~460btq. There’s no way Kia would allow the engine to make 80tq+ more than the transmission can handle and still expect to honor the 10yr/100k mile powertrain warranty.

They would have to build in some much higher limits or they’d be in big trouble when all the Stingers transmissions started failing under warranty.

Can you post, or share where you got the 380ftlb capacity? Tons of people have researched and can’t find anything on the transmission or engine power limits. There’s a reason Kia is keeping this a secret, but if they built in forged piston rods then they must be expecting 600wtq+ and doubt they are building a new transmission to match that output.

Maybe one day we will have proof of what the real limits are but until then I believe that Kia gave us a few hundred extra hp/tq headroom to avoid issues for themselves.
 
StungBlueGT2 said:
I understand your points, but don’t believe anyone has the correct torque capacity since 380ftlbs is much lower than what stock Stingers produce.

Their are multiple dynos with stock Stingers running 385-395tq to the wheels which is closer to ~460btq. There’s no way Kia would allow the engine to make 80tq+ more than the transmission can handle and still expect to honor the 10yr/100k mile powertrain warranty.

They would have to build in some much higher limits or they’d be in big trouble when all the Stingers transmissions started failing under warranty.

Can you post, or share where you got the 380ftlb capacity? Tons of people have researched and can’t find anything on the transmission or engine power limits. There’s a reason Kia is keeping this a secret, but if they built in forged piston rods then they must be expecting 600wtq+ and doubt they are building a new transmission to match that output.

Maybe one day we will have proof of what the real limits are but until then I believe that Kia gave us a few hundred extra hp/tq headroom to avoid issues for themselves.
Click to expand...

While it's great to dream, That's not how engineers work. They are given target specifications and design to a minimum of that. Now that doesn't mean that the design won't exceed the minimum specifications, but it has not been rated or tested for continuous use above that rating. There will never be an official it how much can it take rating, because that's not how the trans is designed or tested. The official rated input capacity that can be found easily on the Powertech website is 50 kgf.m which is actually 361 lb/ft
Rear-wheel Drive [8-speed] Automatic Transmission | Hyundai Powertech

Again that is continuous input capacity, not max limit. Max limit will be anecdotal at best, when people start to roast them at significant power level. In RWD cars I expect clutches to burn up. In AWD cars clutches and or hard parts will start to be problems. But nobody should be expecting them to live long at 550-600wtq levels
 
KLR STINGER said:
While it's great to dream, That's not how engineers work. They are given target specifications and design to a minimum of that. Now that doesn't mean that the design won't exceed the minimum specifications, but it has not been rated or tested for continuous use above that rating. There will never be an official it how much can it take rating, because that's not how the trans is designed or tested. The official rated input capacity that can be found easily on the Powertech website is 50 kgf.m which is actually 361 lb/ft
Rear-wheel Drive [8-speed] Automatic Transmission | Hyundai Powertech

Again that is continuous input capacity, not max limit. Max limit will be anecdotal at best, when people start to roast them at significant power level. In RWD cars I expect clutches to burn up. In AWD cars clutches and or hard parts will start to be problems. But nobody should be expecting them to live long at 550-600wtq levels
Click to expand...

Engineers typically do what they are told and would seek an efficient design because of "bean-counters." However, there are several instances in which they are told to "over design" and understate the reality. Values have been under-reported by a number or manufacturers for multiple reasons. For instance, the Japanese manufacturers are notorious for doing this when reporting output. During the 90s, there were several "gentleman's" agreements such as the 300 km/h for motorcycles and the 276hp agreement for cars. This led to the use of electronic governors during testing and under-reporting values in the literature and media. The truth is the published "official" values may or may not represent the actual values for a variety of reasons. More Horsepower Than Advertised - Cars That Secretly Make Tons of Power

Also, this ignores things such as Factor of Safety (FoS) values which are not published. Which would you rather drive: A) A transmission with a engine torque rating of 361 lb-ft with a FoS of 1 or B) A transmission with an engine torque rating of 350 lb-ft with a FoS of 3.5? Personally, I will gladly take the later with the lower "official" torque rating. I do find it suspicious that Hyundai/Kia would not rate the transmission input torque to at least the spec they provide for engine output torque.

I think that, as you said, these numbers are anecdotal at best and will be fleshed out once people start popping engines and torque converters, and burning fluid and clutches.
 
All the mods and upgrades for your Stinger you could ever ask for. CLICK HERE!
From interior to exterior to high performance - everything you need for your Stinger awaits you...
______________________________
Dang.... Gonna miss the "what's Angel up to?" Updates....
 
Manaz said:
Latest comments are that the tuner is getting about a 20% increase over stock power levels on RON98 with no mods. 300hp at the wheels as a stock benchmark, so that's 360whp.

With mods (intake, exhaust, e85), he is seeing 500whp.
Click to expand...

Who is this? Not Matt McLeod from Throttle Happy Tuning / Kido Racing is it?
 
Tonkabob said:
VT Snorkles! Mod hider! ;)
Are your tires 275 / 30 - 19 and 245/35 -19?
Click to expand...

Lol hahahahaha I made a video on them lol...... they did add 150 hp to the wheels .... you want to buy them? I also had Tork oil catch cans..... I guess nobody gives a shit about those...
 
Last edited:
All the mods and upgrades for your Stinger you could ever ask for. CLICK HERE!
From interior to exterior to high performance - everything you need for your Stinger awaits you...
You must log in or register to reply here.

Cars Connected in the Apple App Store Cars Connected in the Android App Store
Great resources:
- VIN Check
- Clean your leather!
- Safe Emergency Charging
- Windshield Repair Kit
- Chemical Guys HydroSpeed Ceramic Quick Detailer
- Chemical Guys HydroCharge High-Gloss Hydrophobic SI02 Ceramic Spray Coating
- Get a dash cam!
- Auto Buyers Market
Protect your Stinger from code scanners
Back
Top