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bmedfo1

bmedfo1

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I think we all now agree this is True. but I thought more on Why??

After watching a teardown of the Gen1 quad by Monro Live they state that the rear motors combined make 420hp and the front 415 lets just call that a 50/50 split.

As any good SPORTs car enthusiast knows you want some rear power bias for spirited driving.
it seems like the solution they went with on the Gen1 quad was to dial back the power in the front some.

While this thread was started as a bit of a complaint I now am rethinking my position and give Props to Rivian for dialing in some rear bias to sport mode.

If I would have looked close at the limited info Rivian is already displaying for us its right there. Full power to the rear in both modes. Sport pulls just a little (125hp total) back from the fronts. and im down with this now that I know it and why and knowing I can use AP on the highway if i want faster acceleration more then the rear Bias. I love this Truck.

What I do wish Rivian would give us is the ability to customize our own drive modes and a bit more detaild data like a graph that displays power output with the recent max shown as a number. Maybe I want max throttle responsiveness, no rear bias, and low brake regen. Teslas have it. (the ride hight limitations are there for a reason, you cant have full acceleration at high ride hights due to CV shaft angels/stress even though we would all want it)

Monro also noted that the Stator on the rear rivian motors is significantly larger and that there might be room for potential power output of the rear drive units though software. I trust though that there was probably a good reason they chose to pull back from the front vs adding more power to the back. but we can dream.

Note on the Gen2. Obviously the Tri motor will be rear bias. The duel has a more powerfull unit in the back, and even the gen2 quad is using more powerfull rear motors in the back than in the front. Im glad to see them doing this.


Rivian R1T R1S More power & faster in All Purpose than Sport Mode - confirmed with data / dragy IMG_7523
Rivian R1T R1S More power & faster in All Purpose than Sport Mode - confirmed with data / dragy IMG_7522
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mudito

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You're absolutely correct @bmedfo1, sir.

Just tried this in the same stretch of road, back to back. Very easy to reproduce. I'm currently at 76% SoC

 

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Rivian's next update will fix that bug...by 'filling in' the top chunk of color when you accelerate hard in any mode :D

We need some hackers to dig into the code and tell us what's going on...
 

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Just like they fixed the efficiency graph to eliminate being able to see your actual consumption vs. the rated consumption. Not sure what the point of a graph is if it's going to be meaningless bars and lines. Might as well give us back the Knight Rider or BTTF dashboards at this point.
 

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bmedfo1

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Rivian's next update will fix that bug...by 'filling in' the top chunk of color when you accelerate hard in any mode :D

We need some hackers to dig into the code and tell us what's going on...

I Truly hope not. I never put much faith in the "acceleration bar" as no one ever said what it was displaying, in my mind im thinking is it: Throttle position, G force, power output. power output/max limit. requested power, some mix of things? Once I got into the Service screens and found out that at least on the Gen1 quad it seem to me to be a direct display of total electrical current (Amps) with the top of the bar always being 1600amps. or maybe it is KW or HP. I will have to let my battery drain down low to test at lower voltages.
 

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I think we all now agree this is True. but I thought more on Why??

After watching a teardown of the Gen1 quad by Monro Live they state that the rear motors combined make 420hp and the front 415 lets just call that a 50/50 split.

As any good SPORTs car enthusiast knows you want some rear power bias for spirited driving.
it seems like the solution they went with on the Gen1 quad was to dial back the power in the front some.

While this thread was started as a bit of a complaint I now am rethinking my position and give Props to Rivian for dialing in some rear bias to sport mode.

If I would have looked close at the limited info Rivian is already displaying for us its right there. Full power to the rear in both modes. Sport pulls just a little (125hp total) back from the fronts. and im down with this now that I know it and why and knowing I can use AP on the highway if i want faster acceleration more then the rear Bias. I love this Truck.

What I do wish Rivian would give us is the ability to customize our own drive modes and a bit more detaild data like a graph that displays power output with the recent max shown as a number. Maybe I want max throttle responsiveness, no rear bias, and low brake regen. Teslas have it. (the ride hight limitations are there for a reason, you cant have full acceleration at high ride hights due to CV shaft angels/stress even though we would all want it)

Monro also noted that the Stator on the rear rivian motors is significantly larger and that there might be room for potential power output of the rear drive units though software. I trust though that there was probably a good reason they chose to pull back from the front vs adding more power to the back. but we can dream.

Note on the Gen2. Obviously the Tri motor will be rear bias. The duel has a more powerfull unit in the back, and even the gen2 quad is using more powerfull rear motors in the back than in the front. Im glad to see them doing this.


IMG_7523.jpg
IMG_7522.jpg

I can confirm there is a noticeable rear power bias in the trimax. I'm pretty glad it's there. My Wife's i4 M50 has a substantial rear power bias, and despite it being slower than my quad, it felt faster. My trimax feels as fast as it is with the power distribution. I couldn't ask for a better feel in sport.
 

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You're absolutely correct @bmedfo1, sir.

Just tried this in the same stretch of road, back to back. Very easy to reproduce. I'm currently at 76% SoC

I went out and just did a few runs with my truck. I was at 59% SoC. AP didn't max out all the way to the top.Maybe not as enough battery but it was still higher than sport mode at that SoC and the feeling in acceleration was noticeably better in AP. I did my tests from 50-80.

I'll have to find my Dragy and make some instrumented runs.
 

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I like the theory that sport mode is prioritizing for endurance performance,
while AP mode is prioritizing for a sprint performance.
 

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I've really enjoyed this thread, but Dragy sounds like one of those devices that could easily get you (or at least me) into trouble...
 

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mudito

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I've really enjoyed this thread, but Dragy sounds like one of those devices that could easily get you (or at least me) into trouble...
I have a Racebox.... Definitely can get you in trouble ?
 

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I don't do much where I need the extra above 50. Most of the roads I am on are rural and that's about where I top out. If I'm on the freeway I'm commuting so it hasn't been much of an issue. I don't know why we aren't getting full power in sport all the time though, that's the point of the mode.

One thing I will say is the new trimax is a fair amount nastier than the gen 1 quad.
Perhaps when RJ gives Gen 1 owners launch control he will allow full power in sport mode, improving the ¼ mile time.
 

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I like the theory that sport mode is prioritizing for endurance performance,
while AP mode is prioritizing for a sprint performance.
What's crazy is that they nerf the performance dual motor trucks as well. Those are pulling even less current than the quads. And it's still not a lot of current for a 130kwh battery. My old P85D pulled over 1500 amps and it had a battery that was a third smaller than the R1T. And this was on 2014/2015 battery technology.
 

Alanparkcity

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My truck has the 20 rims with 34" AT. This would certainly make sense for Rivian to do to manage traction and posibly even to compensate for the ~2-3% smaller diameter of the other wheel setup. However I would think this would no longer apply after say 65mph where we are still seeing reduced power.
21” wheels and tires are 0.3% smaller, not 3%.
 
 








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