Anyone else notice something strange in 5 Star's 2.0 tuning dyno video?

[Jwhisl]

As the title suggests, there was something a little off about 5 star tuning's maverick video on youtube. The first and most obvious is that they seem to have an fx4 but only the front wheels are on the dyno rollers. the back wheels have chocks. The 2nd thing is that the torque numbers were WAY off. They claim it put down 315tq stock when the engine is rate 271tq at the crank. Given drive train loss that number should be lower like the hp number is. Their final numbers were 267hp and 373.2tq with comes out to 42hp and 57.6tq increase over stock.

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[Shay]

Can't speak to the numbers on output, but the AWD system on the Maverick is FWD unless front wheels slip and power is then routed to the rear wheels. There is a disconnect that keeps power from going to the rear axle as default. It operates as a FWD vehicle.

 

[Darnon]

Torque converter multiplication. Buschur was getting even higher numbers, but that could be differences in dyno and configuration.

Around town the performance is really good, great take off, actually two of my guys here drove it too and we are surprised how strong 1st gear is from a dead stop. Ford did an excellent job with the torque converter, it shows up on the dyno too! The truck put down 376 ft lbs (a torque converter is a torque multiplier for those that don't realize) in 1st gear.

 

[Snax]

Can't speak to the numbers on output, but the AWD system on the Maverick is FWD unless front wheels slip and power is then routed to the rear wheels. There is a disconnect that keeps power from going to the rear axle as default. It operates as a FWD vehicle.

How does a vehicle determine that the front wheels are slipping? I always assumed that some comparison was made between the speeds of the front and rear wheels. But if that were true, the truck would notice that the front wheels were rotating much faster than the back wheels--and therefore conclude that the front wheels must be slipping, and then engage power to the back wheels. Maybe AWD only kicks in of just one front wheel slips, regardless of what the back wheels are doing?

 

[ShadowChas]

I’m not sure how they actually did it - but the awd system can be disconnected with removing the shaft and/or through the computer as well.

 

[Maverickman74]

Im pretty sure this was covered in a bronco sport video. The programmed it to lock fwd only then they forgot to put it back and it drove weird during a test.

 

[Shay]

You would have to check with five star to see what method they use for their testing. The vehicle typically uses the ABS sensors to determine what slipping and what is not.

 

[Portcqb]

Can't speak to the numbers on output, but the AWD system on the Maverick is FWD unless front wheels slip and power is then routed to the rear wheels. There is a disconnect that keeps power from going to the rear axle as default. It operates as a FWD vehicle.

I'm guessing the either disabled the rear at the PTU or pulled the drive shaft. The AWD sends power to the rear on basically any acceleration regardless of wheel slip it really only seems to disconnect the rear at highway speed.

 

[nick112288]

As the title suggests, there was something a little off about 5 star tuning's maverick video on youtube. The first and most obvious is that they seem to have an fx4 but only the front wheels are on the dyno rollers. the back wheels have chocks. The 2nd thing is that the torque numbers were WAY off. They claim it put down 315tq stock when the engine is rate 271tq at the crank. Given drive train loss that number should be lower like the hp number is. Their final numbers were 267hp and 373.2tq with comes out to 42hp and 57.6tq increase over stock.

Torque converter multiplication. Buschur was getting even higher numbers, but that could be differences in dyno and configuration.

Torque multiplication from the torque converter isn't really a factor once you've come up to speed.

Also I think he just didn't properly convey the power levels. I took it as that was their 87 tune, not what it did stock.

 

[HPR]

You would have to check with five star to see what method they use for their testing. The vehicle typically uses the ABS sensors to determine what slipping and what is not.

I can take off @ 35mph on dry pavement and it will engage the rear wheels. I think throttle has to do with a lot of it.

 

[Automate]

Torque multiplication from the torque converter isn't really a factor once you've come up to speed.

A torque converter is like a hydraulic clutch. It can't increase the torque. When it is slipping it will actually reduce the torque slightly. A locking torque convert can transmit full torque when locked into the transmission.

A transmission on the other hand can increase wheel torque depending upon the gear ratio. Sounds like they had it in 1st gear and this is what's going on.

 

[nick112288]

A torque converter is like a hydraulic clutch. It can't increase the torque. When it is slipping it will actually reduce the torque slightly. A locking torque convert can transmit full torque when locked into the transmission.

A transmission on the other hand can increase wheel torque depending upon the gear ratio. Sounds like they had it in 1st gear and this is what's going on.

Torque multiplication from a torque converter is a thing, but primarily it's upon take off. It happens because the engine side of things is spinning faster than the transmission side.

 

[Automate]

Torque multiplication from a torque converter is a thing, but primarily it's upon take off. It happens because the engine side of things is spinning faster than the transmission side.

That is not torque multiplication. That is allowing the engine to spin up to a higher speed. And yes at a higher speed the engine will produce more torque. But the output shaft of the torque convert never has more torque than the input shaft. It does not have a gear ratio that can multiply torque.

 

[Darnon]

That is not torque multiplication. That is allowing the engine to spin up to a higher speed. And yes at a higher speed the engine will produce more torque. But the output shaft of the torque convert never has more torque than the input shaft. It does not have a gear ratio that can multiply torque.

Except they do. https://en.wikipedia.org/wiki/Torque_converter

The main characteristic of a torque converter is its ability to increase torque when the output rotational speed is so low that it allows the fluid coming off the curved vanes of the turbine to be deflected off the stator while it is locked against its one-way clutch, thus providing the equivalent of a reduction gear.

 

[Automate]

Except they do. https://en.wikipedia.org/wiki/Torque_converter

This does not apply at higher speeds when you are measuring maximum engine torque and maximum engine horsepower.

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