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YOUR RESEARCHX51 "stumble" at 3200RPM
Reported or suspected cause
hall sensors
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Reported cause
Had a similar ting on my GT3CS at 6000 rpm, turned out to be faulty hall sensors.
Leading evidence: 'hall sensors' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'hall sensors' (1 discussions; 1 report identifying it and 0 suggest it). No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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I have a new 40th Anniv 911 which comes with with X51 performance kit. I've noticed that around 3200 RPM there is a bit of a stumble or cam shift. It is more noticable that I'd expect so am wondering if it is normal. Anyone else notice the same thing with the X51 package?
Just for a reference, my previous car was a 2000 Boxster S and while I could feel it coming on cam in terms of a "rush", this is more like "slight jerk"; even at normal/casual street driving speeds. On the Boxster, I only noticed when getting on the throttle aggresively.
If you look at the X51 cams, the difference between the low speed and the high speed lobs is significant. Enjoy the stumble and what comes right after it.
Same question I asked a looong time about my 2002 C4S; just the variocam plus kicking in.
I believe before 2002 was just variocam (not plus).
Enjoy the variocam plus kick, and enjoy the fuel economy when it is not engaged.
If it is not a kick or "rush" but a stumble or hesitation, then you have a problem.
the surge at 3200 rpm is variocam + like everyone mentioned. The surge is more noticeable with hacked mufflers. That is one of the reasons I went back to the stock exhaust. I also felt more low-end power with the stock cans. I had Daren Fister’s Mod ll, I loved the sound and think the mod was worth the money but I liked the smoothness and low-end power more.
correct somewhat... a hall sensor is nothing more than a proximity sensor (eg: pulses a signal when a tooth of a cog passes by it. The DME then calculates RPM based on the frequency of the pulses.)
But, I think it is used to sense the position of the variocam.
One time I got this question posed to me.
Other Guy: Is that a 911 or a Carrera?
Me: Uhmmm... YES!
Other Guy: HUH???
So I had to explain that all Carreras are 911 but not all 911s are Carreras. Turbo, GT3, Carrera S etc. The other guy's brow wrinkled and he had the "deer in the headlights" look on his face.
Other Guy: Uhmmm.... anyway.... nice looking car!
When I bought mine, it hadn't been driven in the 4 months prior.
I noticed a marked hesitation around that RPM when I first started to drive it and even posted here on it. Once I switched to 94 Octane and the DME learned my driving pattern, that momentary lag is completely gone.
Steady acceleration up to variocam kick in and then that really fun buzz up to redline!!
Pete
Yeah, it must be pretty annoying when there's an issue so pronounced that every new owner feels the need to post an, "am I nuts or is my car doing something weird" thread about it for FIVE YEARS.
Must need to resurrect that thread from 2004 detailing how the aftermarket tuners tweaked the fuel and timing at the changeover to smooth over the surge.
It's fun when you're "on it" but incredibly irritating when you're planning a part-throttle shift at 3500 and it surges just before you shift and your passenger (wife) says, "so, just learning stick shift are you?"
Or when you're slightly more aggressive and upshifting at 4500 and you come down just before the surge and say WTF did I do?
