Land Down Under Truck Speed Test

[RamDiver]

Measuring 1/4 *MILE* time in *KM/H* makes my eye twitch.

Just like the roll-on test from 50kph.

When I heard 50 the first time, I just expected it to be 50mph but they arrived much too quickly.
Who cares about a roll-on from 31mph, that's almost laughable if it weren't so silly.

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[crash68]

I thought the 6.2's had pushrod issues,not cam/lifter issues

There's been issues with any of the GM DFM lifters failing but the '19-'22 6.2L have been having lower end failures, enough to initiate a NTHSA investigation.

 

[RamDiver]

3.21 to 3.92 is not going to drop 2 seconds off that Hemi time. Maybe 2/10th

I'm not convinced that the final gear ratio differences were the only flaws in this so-called performance testing.

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[crash68]

Who cares about a roll-on from 31mph

Doing a 30 roll helps equalize if there's considerable difference in rear end gearing where the lowers rear ends can get out of a dead stop quicker.
What works against the rolling start is the transmission shifting capabilities. The 8HP line of transmissions not only have extremely quick shift times but is also capable of dropping multiple gears at once, its capable of downshifting from 8th to 2nd if the situation arises.
Both Ford and Chevy have had lots of shifting issues with the joint developed transmission that is in both trucks in that testing.

 

[RamDiver]

Doing a 30 roll helps equalize if there's considerable difference in rear end gearing where the lowers rear ends can get out of a dead stop quicker.
What works against the rolling start is the transmission shifting capabilities. The 8HP line of transmissions not only have extremely quick shift times but is also capable of dropping multiple gears at once, its capable of downshifting from 8th to 2nd if the situation arises.
Both Ford and Chevy have had lots of shifting issues with the joint developed transmission that is in both trucks in that testing.

I understand the logic but wouldn't a limited-distance roll-on test from 50mph provide better real-world information?

I can't see the sense in a low-speed drag race. Am I missing something else?

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[turkeybird56]

I understand the logic but wouldn't a limited-distance roll-on test from 50mph provide better real-world information?

I can't see the sense in a low-speed drag race. Am I missing something else?

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Maybe they were glorified go-karts??? lol

 

[Wild one]

Good morning,

With your experience racing Hemi trucks, what are your thoughts on these finishing times, specifically the 5.7 Hemi?

I would have expected more from the Hemi but being a rank amateur, I don't really know.


View attachment 564303

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Depending on what the DA/density altitude was at the time of the test,it's a bit slow but not out of the ballpark.
If they were testing at 4,500+ft DA it's pretty close,if they were testing at 2,000ft,it's slow as hell,lol.
I'd expect to see mid to high 14's out of the hemi at 2,000ft,or about a second less then their off brand style test did.
It looks like a fun test,but how much stock i put in it i'm not sure,lol.
On paper the HO should definitely be the fastest,and that's about all i'd take away from this test,as it's not a very scientific way to test,hell they didn't even use an arm drop to start,lol

 

[crash68]

wouldn't a limited-distance roll-on test from 50mph provide better real-world information?

The faster the vehicle is moving narrows gap to the engine power band, then the vehicle weight, aerodynamics and driver timing plays a bigger factor in the outcome.
A thirty roll would be more likely encounter on a daily driving scenario as it would be similar to merging onto a freeway.
I would have rather seen them hook up identical 7K lbs trailers, and flogged the crap out of the trucks. This would show how well an engine is kept in the peak of the power band.

 

[Dodge 1500 4X4]

but the '19-'22 6.2L have been having lower end failures,

Connecting rods and wrist pin clips missing or broke out.

 

[RamDiver]

Depending on what the DA/density altitude was at the time of the test,it's a bit slow but not out of the ballpark.
If they were testing at 4,500+ft DA it's pretty close,if they were testing at 2,000ft,it's slow as hell,lol.
I'd expect to see mid to high 14's out of the hemi at 2,000ft,or about a second less then their off brand style test did.
It looks like a fun test,but how much stock i put in it i'm not sure,lol.
On paper the HO should definitely be the fastest,and that's about all i'd take away from this test,as it's not a very scientific way to test,hell they didn't even use an arm drop to start,lol

Thanks for that explanation.

Glad to hear my expecting a slight bit better results for the Hemi is realistic.

There were no great surprises other than not having some form of launch signal or pseudo photo finish.

A human dropping a flag or a third party voice command would have been better than the lead pilot saying "go".

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[DanAR]

I can’t imagine anyone liking points over electronic ignition. That being said I’m not really a fan of Mopars “clean burn ignition,” either.

Yeah, I know but in my lifetime I’ve been left on the side of the road waiting for a tow 3 times due to various electrical ignition failures in different vehicles. I have 3 cars now with dual point distributors and I grew up and drove cars with points for years and never had one fail on me on the road. New vehicle electronic ignitions are pretty solid and I’m not making a case for points. Just illustrating the old school soul that makes the rumble of a V8 more attractive to some of us even if it isn’t the fastest thing on the block.

 

[Farmer Fran]

RAM has been getting slapped by Ford and Chevy for years in the 1500 power department. The 5.7 Hemi was always the lowest power and speed. Why they never put in the 6.4 seems silly to me but they were always in the buy a 2500 or 3500 camp if you need more. But sometimes it is not about that...and that is why i like the SST HO

 

[Lloyd33]

Now if the SST just looked like the original SS/T..

 

[jmc921]

Measuring 1/4 *MILE* time in *KM/H* makes my eye twitch.

At least they didn’t use metric time!