Incorrect. On the 90's ZR1, there was a valet setting that prevented 8 of the 16 throttle bodies from opening, and reduced fuel and spark curves. I believe it also limited RPM range, but it has been awhile so I may be mistaken on this. It limited the engine to about 270HP from what Chevy said, however, having driven them, I would suspect under 200hp.
The car ran fine in this mode. In fact, you could drive it all day and not know the difference until you put your foot in it.
That may be what I was thinking of. Any insights on how the P400 vs. P500 mode works? Is it similar to this?
Incorrect. On the 90's ZR1, there was a valet setting that prevented 8 of the 16 throttle bodies from opening, and reduced fuel and spark curves. I believe it also limited RPM range, but it has been awhile so I may be mistaken on this. It limited the engine to about 270HP from what Chevy said, however, having driven them, I would suspect under 200hp.
The car ran fine in this mode. In fact, you could drive it all day and not know the difference until you put your foot in it.
What an awesome idea
THAT is worth having on any high end car
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That may be what I was thinking of. Any insights on how the P400 vs. P500 mode works? Is it similar to this?
P400 limits the opening of the individual throttle bodies to 90% of their travel. This results in an area of approximately 80% of the fully open area, hence 80% of the horsepower is available.
0-100 kmh in 6 seconds? Wow, that seems kinda slow for a 400-hp car (400 hp mode that is).... the outgoing E60 545i with 75 fewer horses goes a tick quicker.
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P400 limits the opening of the individual throttle bodies to 90% of their travel. This results in an area of approximately 80% of the fully open area, hence 80% of the horsepower is available.
0-100 kmh in 6 seconds? Wow, that seems kinda slow for a 400-hp car (400 hp mode that is).... the outgoing E60 545i with 75 fewer horses goes a tick quicker.
It's my understanding that the P400 mode restricts maximum throttle, but to my knowledge BMW has never released horsepower and torque plots against rpm for the P400 mode. We may be assuming that the P400 plots are the P500 plots, minus 20% across the entire rpm range, but what if the throttle restriction imposes a much greater penalty on the engine at higher rpm than at lower rpm, such that torque and horsepower fall off at a significantly lower rpm in P400 mode? Would it be counterproductive to accelerate to redline in P400 mode? Perhaps upshifting earlier results in a better acceleration time. Just speculating. We needs those P400 mode power curves, and someone better than I to interpret them.
No one has suggested that p400 mode also remaps to slightly boosts low end torque for better tractability during relaxed driving. Too bad. A little more low end torque would have better justified the p400 mode.
I agree Richard... without a different curve in P400 that boosts torque, it is a pointless gimmick.
I wouldn't be surprised to find that BMW has done more than limit the throttle opening. IIRC, several members report that they feel more power with P500, without flooring it.
Thanks for the elaborate responses, guys, and posting some official numbers.
So I guess given the setup (and official test times) the P400 vs. E39 Beast is not a fair 1-to-1 comparison. Seems it should be used just for highway cruising as opposed to 'spirited' driving...
Linear Mode
