Engine Limits vs Power -- Sharing Some Knowledge
So according to you my car is a time bomb.
I have my car tuned from US tuner putting over 900Nm on the wheels, I drive the car as a weekend toy so I usually abuse it . I have 34k km/s on it 4 sets of tyres if that makes sense. I street race very often from 30 to 300, some times I do this repeatedly, I also drive to the hills on the limits 2nd 3rd gear all the time, I have also changed my PCCB pads due to hard driving and the car drives like a rocket.
I have my car tuned from US tuner putting over 900Nm on the wheels, I drive the car as a weekend toy so I usually abuse it . I have 34k km/s on it 4 sets of tyres if that makes sense. I street race very often from 30 to 300, some times I do this repeatedly, I also drive to the hills on the limits 2nd 3rd gear all the time, I have also changed my PCCB pads due to hard driving and the car drives like a rocket.
LOoOL stop abusing your car and just schedule in future plan the reinforcing kit protomotive have
cheers
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Joined: Feb 2011
Posts: 176
From: london
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Honestly...the biggest cost in a job like this is not the rods themselves. You'll spend somewhere between $250-$300 (EACH) for a good set of rods. The expensive part is the labor to have your engine removed, torn down, rebuilt, re-assembled, and re-installed. It's a very labor intensive process unfortunately. Then the issue becomes "well if I'm in the engine anyway, why not do some head work, etc?" Again parts for some of these upgrades are not that costly...it's really the labor you're paying the most for.
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Joined: Feb 2011
Posts: 176
From: london
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Quote:
So according to you my car is a time bomb.
I have my car tuned from US tuner putting over 900Nm on the wheels, I drive the car as a weekend toy so I usually abuse it . I have 34k km/s on it 4 sets of tyres if that makes sense. I street race very often from 30 to 300, some times I do this repeatedly, I also drive to the hills on the limits 2nd 3rd gear all the time, I have also changed my PCCB pads due to hard driving and the car drives like a rocket.
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You dont abuse it enough!! With same specs and kms i ve changed pads a whooping 6-8 times on my pccb! You have to driver harder!
So according to you my car is a time bomb.
I have my car tuned from US tuner putting over 900Nm on the wheels, I drive the car as a weekend toy so I usually abuse it . I have 34k km/s on it 4 sets of tyres if that makes sense. I street race very often from 30 to 300, some times I do this repeatedly, I also drive to the hills on the limits 2nd 3rd gear all the time, I have also changed my PCCB pads due to hard driving and the car drives like a rocket.
------
You dont abuse it enough!! With same specs and kms i ve changed pads a whooping 6-8 times on my pccb! You have to driver harder!
Registered User
Joined: Jul 2007
Posts: 556
From: CT
Rep Power: 58
I think your right on. Basically, most of what is being discussed has to do with fatique phenomenon, a well known issue with materials under going repeated stress. Google S-N curves and you will get a ton of information. Each metal and geometry will generally have a fatique limit that corresponds to the number of cycles. The greater the stress the less cycles it will take to fatique if you're above the fatique limit. Certain metals like aluminum and magnesium do not have a fatique limit, meaning that the material will eventually fail no matter what after so many cycles (it could be a very very long time). That's why they grounded all those SW Boeing 737s because of metal fatique due to take-offs and landings (cycles). With steel rods, there likely exists a fatique factor that if you stay below, it will NEVER fail no matter how many stress cycles it encounters. For the internals parts of a motor, one would really have to know the fatique limits for each component, piston, rods, crank, etc...I'm sure Porsche knows these numbers. So if I ever plan to jack up the power on my car and keep stock motor, I know that I will probably be on borrowed time. Hopefully, within that time, I will upgrade the various components so I can enjoy a longer cycle time before failure.
Thank you.
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Joined: Aug 2009
Posts: 823
From: Mojave, CA
Rep Power: 133
Awesome discussion! to throw a little more fuel on the rod limitation argument, I came across a dynojet run of the GT2RS :
http://blogs.insideline.com/straight.../gt2_chart.jpg
We know the VTGs can do way more low end torque, but it looks as if Porsche chose to limit it considerably. Whether its a durability or drivability issue is the question.
http://blogs.insideline.com/straight.../gt2_chart.jpg
We know the VTGs can do way more low end torque, but it looks as if Porsche chose to limit it considerably. Whether its a durability or drivability issue is the question.
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