At what RPM do you shift?
06-15-2007 | 07:37 PM
#32
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From: New Jersey
Originally Posted by Jim bailey - 928 International
The Myth that you had to rev Porsche engines came about because a few early race engines 356 used roller bearings on the crank and lugging the engine would pound the rollers flat rather easily so they always kept them spinning ..... Frankly in normal driving using high RPM just wears out an engine ....the motor does not know how many miles it has traveled nor does it care much all it sees is piston travel how many times it goes up and down and piston speed. Those are what determine how much wear an engine has not miles. So grinding around in lower gears and reving to red line just reduces how long the engine should last. One of my 911 race engines was built with the understanding that in 24 hours it would need rebuilding ! 996-997 cup cars last 40 hours. Early cars peak out H P at about 5200 rpm spinning faster just makes more noise. Peak torque is a bit over 4,000 rpm. I abuse the old very brown 1980 on the track and seldom rev it on the street !
06-15-2007 | 07:57 PM
#33
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You turn up the wick and the lamp burns brighter.....just not as long ! classic line purported to have been said by a Posche racing engineer when asked , how do you increase the horsepower ? ...."You just reduce the reliability !" .
06-15-2007 | 08:10 PM
#34
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From: New Jersey
Originally Posted by Jim bailey - 928 International
You turn up the wick and the lamp burns brighter.....just not as long ! classic line purported to have been said by a Posche racing engineer when asked , how do you increase the horsepower ? ...."You just reduce the reliability !" .
I would not drive the GTS this way and I use it differently more of a highway cruiser and she likes to hover between 3 and 4K unless I need some passing power.
06-16-2007 | 01:38 AM
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Hacker:
Quick reminder... Don't forget to buy me that case of Techtron.
Guess maybe I should rev the OB a little more. Maybe he's bored with me. I've never had it past 4500.
Quick reminder... Don't forget to buy me that case of Techtron.
Guess maybe I should rev the OB a little more. Maybe he's bored with me. I've never had it past 4500.
06-16-2007 | 03:20 AM
#37
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Burning Brakes
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From: Portland, OR
Great response. Thanks! I've been trying to clear a sticky lifter and have been redlining it quite a bit lately (on recommendation from some no-cal folks) with two quarts of Rislone and a new oil change. I'm not sure my car has a rev-limiter. 
I could push it all the way through the red if I wanted to. hmmm...
I could push it all the way through the red if I wanted to. hmmm...
06-16-2007 | 03:12 PM
#40
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From: New Zealand
my ecu has been remapped to limit revs at 6900 but my shift light comes on at 6400 which is about where i will shift if im pushing it. otherwise its easy to short shift around town and just waft about on tourque.
andrew, the boat is still in negotiation but ive got a feeling i will be back. where did you guys say that other hooters bar was?
andrew, the boat is still in negotiation but ive got a feeling i will be back. where did you guys say that other hooters bar was?
06-17-2007 | 12:13 AM
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From: On my blackberry
Originally Posted by FlyingDog
Leslie, your rev limiter is 6200 IIRC. I've hit mine a few times. It's way too low...
Too low for what, highway entry speeds, or launching to the moon??
06-17-2007 | 04:58 AM
#43
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From: saratoga, ca
Not actually true. if peak HP is at 5200, then the best average application of HP will be at some point over it . how much over it, depends on if it falls faster than it rose generally, it always pays to shift over peak hp for maximum acceleration.
Mk
generally, it always pays to shift over peak hp for maximum acceleration. Mk
Originally Posted by Jim bailey - 928 International
The Myth............. Early cars peak out H P at about 5200 rpm spinning faster just makes more noise. Peak torque is a bit over 4,000 rpm. I abuse the old very brown 1980 on the track and seldom rev it on the street !
06-17-2007 | 06:37 AM
#44
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From: Sydney AUS
6,600rpm equates to about 4,200 rpm in the next gear - just about right to keep the flappy from going to the low revs setup, and to keep it all spinning in the high HP/Tq band.
Around town - about 2,500 rpm - no wonder they get grumpy
Around town - about 2,500 rpm - no wonder they get grumpy
06-17-2007 | 10:14 AM
#45
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From: Ft. Lauderdale FLORIDA
"Cheap, fast, reliable. You can never have more than two of these"
The closest you can get is probably a 928, but that line above still implies. Man- you folks really rev your motors higher than I do! In the heat of battle, I occasionally hit the rev limiter, but only once in a while. Normal driving? I shift at around 2200 rpm, which is just high enough to prevent the tach from dropping below 1500 rpm [Porsche's stated mimimum] in the next gear. I don't overboost the engine either: low RPM's = low throttle. Basically, my point is that the harder you drive your car, the sooner it wears out.
Going to the grocery store, I usually don't accelerate any faster than the people around me in minvans and Corollas.
The closest you can get is probably a 928, but that line above still implies. Man- you folks really rev your motors higher than I do! In the heat of battle, I occasionally hit the rev limiter, but only once in a while. Normal driving? I shift at around 2200 rpm, which is just high enough to prevent the tach from dropping below 1500 rpm [Porsche's stated mimimum] in the next gear. I don't overboost the engine either: low RPM's = low throttle. Basically, my point is that the harder you drive your car, the sooner it wears out.
Going to the grocery store, I usually don't accelerate any faster than the people around me in minvans and Corollas.