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355Spider said:
I was reading on another forum and this guy claims that the overboost does not work in 5th or 6th or above 5K rpms. Is this true? If it is, when would the overboost even be on during a full boil take off thru the gears. I mean you almost always stay above 5K when really getting on it. Thoughts?
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355Spider said:
SO basically if you are doing an acceleration run at full boil it's almost useless except in the beginning of 1st gear. After you get the engine in it's sweet spot it vanishes. Seems a little pointless.
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devo said:Quote:
355Spider said:
I was reading on another forum and this guy claims that the overboost does not work in 5th or 6th or above 5K rpms. Is this true? If it is, when would the overboost even be on during a full boil take off thru the gears. I mean you almost always stay above 5K when really getting on it. Thoughts?
Overboost is available between 2100-4000 rpms. It is only realized under full throttle applications. It progressively diminishes at 4000 and ceases to be available at or about 5000 rpms. Any shifts above that point do not allow for the availability of the overboost option.
In the event of a full throttle run through the gears, overboost would only be available in first gear, if the car was launched below the aforementioned revs.
Your one gear theory, probably has implications to future tuning programs..if they simply modify the over boost characteristics,voila faster exceleration...without too much stress on the engine...if what you are saying is true and it makes some sense that it is, remapping should eventually make this a wickedly fast car(not that it's slow now). The only way this wouldn't hold, would be if the boost and or rev range available to boost was going to generate to much pressure on the engine. Someone wrote on a previous thread, an engineer with Porsche claimed the engine could easily handle 1.4 bar of boost. Unfortunately I can't recall who posted that information 
Wouldn't this make sense or is the law of diminishing returns at work to the point where the touque can't easily be extracted? 
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aah986 said:
Hi there, the following might answer your questions:
On my car, end of first gear is around 40 mph. when you change to second gear, 40 mph equals 4500 rpm which means your are beyond the peak torque of 505 but still higher than 460.
Top of second gear is around 70 mph, when you change to third, 70 mph equals again about 4500 rpm, so you are still getting more than 460 but less than 505 of torque.
top of third gear is around 100 mph, changing to 4th at 100mph equals 5000 rpm so you are getting only 460 of torque from that point on.
Summary: from first to end of 3rd gear (100 mph), you are definitely using the overboost benefit although not the complete 505 available only in first.
Hope that explained a little.
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aah986 said:
Hi there, the following might answer your questions:
On my car, end of first gear is around 40 mph. when you change to second gear, 40 mph equals 4500 rpm which means your are beyond the peak torque of 505 but still higher than 460.
Top of second gear is around 70 mph, when you change to third, 70 mph equals again about 4500 rpm, so you are still getting more than 460 but less than 505 of torque.
top of third gear is around 100 mph, changing to 4th at 100mph equals 5000 rpm so you are getting only 460 of torque from that point on.
Summary: from first to end of 3rd gear (100 mph), you are definitely using the overboost benefit although not the complete 505 available only in first.
Hope that explained a little.
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