Under drive Waterpump Pulley for Stinger GT's

[Ohiocruiser]

Definitely looking forward to the report after you drive.

I did drive it. I would be lying, saying that i felt bump in power. Theoretically it should free up couple of horses, but theres no way to determine it without proper dyno testing. I wanna say it revs little faster. But i also installed ark secondary downpipes recently, so maybe that is the reason. Would i do it all over again? I gotta say yes, just because it looks so cool, especially when spinning. Because of the cutouts in the pulley, you can clearly see the water pump behind it.

 

[Stiletto]

I did drive it. I would be lying, saying that i felt bump in power. Theoretically it should free up couple of horses, but theres no way to determine it without proper dyno testing. I wanna say it revs little faster. But i also installed ark secondary downpipes recently, so maybe that is the reason. Would i do it all over again? I gotta say yes, just because it looks so cool, especially when spinning. Because of the cutouts in the pulley, you can clearly see the water pump behind it.

Yeah, power is NOT going to be a factor here. Revs should be a bit more free, but coming from the EJ25 pulley kits, I don't expect quite the same result.

Biggest impact is the dimming of lights, low idle or balance of the lighter pulley.

Thanks!

 

[Stiletto]

Yeah, power is NOT going to be a factor here. Revs should be a bit more free, but coming from the EJ25 pulley kits, I don't expect quite the same result.

Biggest impact is the dimming of lights, low idle or balance of the lighter pulley.

Thanks!

Oh, and water temps... curious if you'll see a difference. Will be hard to know unless you have JB4 logs from before the swap.

 

[Ohiocruiser]

Oh, and water temps... curious if you'll see a difference. Will be hard to know unless you have JB4 logs from before the swap.

I dont have a jb4. So have no idea about coolant temps

 

[djerickd]

I did drive it. I would be lying, saying that i felt bump in power. Theoretically it should free up couple of horses, but theres no way to determine it without proper dyno testing. I wanna say it revs little faster. But i also installed ark secondary downpipes recently, so maybe that is the reason. Would i do it all over again? I gotta say yes, just because it looks so cool, especially when spinning. Because of the cutouts in the pulley

thanks for your review!!

 

[RogueIV]

doubt that small of a difference in diameter is going to make a difference in coolant temps at all. Also if it's smaller it's spinning faster not slower, that's actually a overdrive pulley lol!

 

[RogueIV]

FYI a smaller crank pulley would be underdrive.

The Driven pulleys (water pump, PS pump, Alternator, ect..) need to be bigger to be "underdrive".

 

[rpoffen]

FYI a smaller crank pulley would be underdrive.

The Driven pulleys (water pump, PS pump, Alternator, ect..) need to be bigger to be "underdrive".

Probably the biggest influence is the weight difference, in any case, I doubt it is worth the time, money, and effort.

 

[RogueIV]

Probably the biggest influence is the weight difference, in any case, I doubt it is worth the time, money, and effort.

Yeah, it does look pretty though haha.

 

[Hawk853]

OEM diameter light weight pump pulley available.

2018+ Stinger 3.3T SRKi Water Pump Pulley

Established in 1999, Shark Racing is the No. 1 source of parts and accessories for Korean cars.

sharkracing.com

 

[Stiletto]

OEM diameter light weight pump pulley available.

2018+ Stinger 3.3T SRKi Water Pump Pulley

Established in 1999, Shark Racing is the No. 1 source of parts and accessories for Korean cars.

sharkracing.com

Slightly heavier, but $100 less than the 200 gram option.

 

[djerickd]

That 200 gram option also says available only in RED now...

 

[AdrianG]

I would be interested in seeing if there are any actual gains in regards to power or if the coolant temps are realistically affected like they say. Obviously the thermostat maintains the coolant temps, but a faster spinning water pump could (hypothetically) help lower coolant temps, in practice.

 

[Stiletto]

I would be interested in seeing if there are any actual gains in regards to power or if the coolant temps are realistically affected like they say. Obviously the thermostat maintains the coolant temps, but a faster spinning water pump could (hypothetically) help lower coolant temps, in practice.

No changes in cooling temps. And, no added power. Granted, I powder coated mine, so that added a few grams of weight, but lightweight pulleys have never been a source of power. They simply allow the engine to rev easier...kinda how weight loss in a vehicle doesn't add power, yet allows it to accelerate faster.

 

[AdrianG]

No changes in cooling temps. And, no added power. Granted, I powder coated mine, so that added a few grams of weight, but lightweight pulleys have never been a source of power. They simply allow the engine to rev easier...kinda how weight loss in a vehicle doesn't add power, yet allows it to accelerate faster.

I appreciate your response, I reckon using the word "performance" instead of power would have been more accurate. The way I see it is essentially the water pump could provide more efficient cooling, but it would be nearly impossible to know it it is actually doing that since the thermostat regulates the temperature at a given point.

 

[oddball]

I appreciate your response, I reckon using the word "performance" instead of power would have been more accurate. The way I see it is essentially the water pump could provide more efficient cooling, but it would be nearly impossible to know it it is actually doing that since the thermostat regulates the temperature at a given point.

It'd free up maaaaaaaybe 1hp. Maybe.
Fun fact: *slower* moving water is more efficient at transferring heat! If it goes too fast then it won't transfer very much at all, as water isn't actually a great heat exchanger. It's just convenient and works well enough. Note that this partially ignores various arguments about the precise definition of "efficiency" and whatnot.

In ye olden days, underdrive pulleys were more useful for the alternator and power steering pump, which do take quite a bit (can get up to 10hp to 20hp depending on load). The alt/pump were wildly overbuilt so you could underdrive them and still make out OK, especially for a car primarily intended for the strip. Modern systems are extremely tweaked to minimize the unnecessary power draw, so won't get nearly as much benefit - at least with a still functioning steering assist and charging system. ECU controlled PWM alternators were exotic 20 years ago, but quite common now. And various steering systems that don't rely on a vane pump are common. Heck, they're even doing magic with the transmission pump to minimize its power usage when unnecessary.

But, the pulley is pretty. I wouldn't hold it against anyone for getting it.

 

[Hawk853]

Even bigger weight savings if willing to give up crank dampning.

Unorthodox Racing CS731 - AAADEM LLC - Unorthodox Racing (UR)

Product Details for Unorthodox Racing CS731 - Crankshaft Pulley - Stock Diameter.

www.unorthodoxracing.com

 

[Ohiocruiser]

Even bigger weight savings if willing to give up crank dampening.

Unorthodox Racing CS731 - AAADEM LLC - Unorthodox Racing (UR)

Product Details for Unorthodox Racing CS731 - Crankshaft Pulley - Stock Diameter.

www.unorthodoxracing.com

What does "give up crank dampening" mean? Edit: never mind. Quick search shows it introducing a lot o risk.

 

[AdrianG]

It'd free up maaaaaaaybe 1hp. Maybe.
Fun fact: *slower* moving water is more efficient at transferring heat! If it goes too fast then it won't transfer very much at all, as water isn't actually a great heat exchanger. It's just convenient and works well enough. Note that this partially ignores various arguments about the precise definition of "efficiency" and whatnot.

In ye olden days, underdrive pulleys were more useful for the alternator and power steering pump, which do take quite a bit (can get up to 10hp to 20hp depending on load). The alt/pump were wildly overbuilt so you could underdrive them and still make out OK, especially for a car primarily intended for the strip. Modern systems are extremely tweaked to minimize the unnecessary power draw, so won't get nearly as much benefit - at least with a still functioning steering assist and charging system. ECU controlled PWM alternators were exotic 20 years ago, but quite common now. And various steering systems that don't rely on a vane pump are common. Heck, they're even doing magic with the transmission pump to minimize its power usage when unnecessary.

But, the pulley is pretty. I wouldn't hold it against anyone for getting it.

Thanks for your response, solid information.

 

[rpoffen]

I used to have an underdrive setup on my '98 SVT Mustang Cobra (4.6l DOHC aluminum V8), it consisted of three pieces, under size crank pulley, and oversize water and alternator pulleys. Reduced rotating speed of both water pump and alternator by 25%. Definitely made a difference on that motor, but then again, it redlines at 6800 RPM, above what the 3.3l in the stinger will do.