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Lurkasaurus
 
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Join Date: Apr 2004
Location: SK, Canada
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1st gear is just shy of the RL(a tad under 7K) - just to stay on boost in 2nd. In the other gears I don't feel the need to go over 6500, I have B&B headers w/ K27-7006.

What's the deal on Porsche tachometers and the rev-limiters? My limiter usually cuts in at 6900rpm or so but I once saw 7200! - I couldn't sleep for a week! Does the RL act a little wonky sometimes? I heard Porsche tachs read a bit high too - which might be a good thing. Is there any maintenance you can do to the rev-limiter?
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Old 03-15-2008, 01:51 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
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Join Date: May 2007
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Holy @$%^& I'm reading these posts and thinking 3000 rpm in 3rd in my car is 110km/h. That is 10km/h above the legal speed limit in most places.
Maybe I should move to the good ol' U S of A.
I would love to throttle it's neck more than I do, but if I stuck to these rpm's, they would put me in jail and throw away the key in Oz.
Old 03-16-2008, 03:44 AM
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Quote:
Originally Posted by Porscott View Post
Holy @$%^& I'm reading these posts and thinking 3000 rpm in 3rd in my car is 110km/h. That is 10km/h above the legal speed limit in most places.
Maybe I should move to the good ol' U S of A.
I would love to throttle it's neck more than I do, but if I stuck to these rpm's, they would put me in jail and throw away the key in Oz.

So........let's go all with our cars to..........Germany....one of the only places where you can drive safely with no speed limits.....(only on motorways and not everywhere.....)........
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Old 03-16-2008, 04:06 AM
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Crotchety Old Bastard
 
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Safety is relevant. Just because the posted limit is 70mph in a specific area doesn't mean that 120mph is unsafe. No regard is given when posting speed limits as to weather you are driving a dump truck or a spots car.
My Porsches have all had 915s and topped out at ~140mph. I took them there often.
The safe speed envelope is ever increasing as auto technology advances. It is the stupidity envelope you gotta watch out for.
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Old 03-16-2008, 06:54 AM
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Hmm...as far as I know, 930's have exactly same sort of weak rod bolts as early Carrera's. Fortunately, 930 rod bolt failure seem to be much less common, which I personally attribute to 930 low-revin nature and the fact that you don't need to rev the pi$$ out of motor to get somewhere.

That being said, with stock cams power tops at 5500 RPM and it just goes downhill from there. Only reason to rev beyond it is in order to drop into better range on next upshift and thus broaden the "area under powercurve" to maximize accelleration.

It might be a way to wring out some more performance from a 4-speed box but I woudn't rev it more than 6000, maybe 6200 RPM's. Remember, rod loading is not linear with revs but with RPM^2. Bump it into rev-limiter one time too many and those rod bolts will stretch and lead to problems later on.
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Old 03-16-2008, 10:35 AM
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Turbo Hooligan
 
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Originally Posted by beepbeep View Post
Bump it into rev-limiter one time too many and those rod bolts will stretch and lead to problems later on.
ARP rod bolts.... drive it hard and put it away wet!
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Old 03-16-2008, 11:06 AM
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Quote:
Originally Posted by RarlyL8 View Post
Safety is relevant. Just because the posted limit is 70mph in a specific area doesn't mean that 120mph is unsafe. No regard is given when posting speed limits as to weather you are driving a dump truck or a spots car.
My Porsches have all had 915s and topped out at ~140mph. I took them there often.
The safe speed envelope is ever increasing as auto technology advances. It is the stupidity envelope you gotta watch out for.
Agree with you totally. Driver fatigue, lack of concentration and plain bad driving are the REAL contributors to accidents.
Unfortunately in this country there is an obsession with speeding vehicles. "speed kills" is the catch cry that governments have rammed down the throat to everyone for so long, I'm afraid that the brain washing is having an effect.
Whenever there is an accident, speed is blamed. No mention of the poor road conditions, the drug induced idiot or the overtaking 3 cars around a blind corner scenario. No, the answer to every accident is either install a fixed speed camera or reduce the allowable speed limit.
Trouble is, the laws are designed for the lowest common denominator.
Old 03-17-2008, 03:16 AM
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Quote:
Originally Posted by Porscott View Post
Agree with you totally. Driver fatigue, lack of concentration and plain bad driving are the REAL contributors to accidents.
Unfortunately in this country there is an obsession with speeding vehicles. "speed kills" is the catch cry that governments have rammed down the throat to everyone for so long, I'm afraid that the brain washing is having an effect.
Whenever there is an accident, speed is blamed. No mention of the poor road conditions, the drug induced idiot or the overtaking 3 cars around a blind corner scenario. No, the answer to every accident is either install a fixed speed camera or reduce the allowable speed limit.
Trouble is, the laws are designed for the lowest common denominator.
It's strange...Reading your post...I thought you were French..........but, only your last talk is different...or less...here we have to add.......
"Trouble is, the laws are designed for the lowest common denominator....and put a lot of money in the government pockets"......Here, we call this....racket....and French automobilist is "milk cow"...la vache lait......
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Old 03-17-2008, 11:27 AM
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