968 torque curve characteristics
#1
968 torque curve characteristics
Hi!
I test drove a '92 968 here in Sweden today, and noticed that it really seemed to pick up at about 4,000 rpm. I have driven several over the last few weeks but didn't notice such a step in the torque curve at this point. Is it normal for there to be a marked increase at around 4,000 rpm? Performance below 4,000 was good, no holes in the torque curve. It reminded me of my old Yamaha 250 two stroke that suddenly hit the powerband!
cheers
Derek Holliday
Linköping, Sweden
I test drove a '92 968 here in Sweden today, and noticed that it really seemed to pick up at about 4,000 rpm. I have driven several over the last few weeks but didn't notice such a step in the torque curve at this point. Is it normal for there to be a marked increase at around 4,000 rpm? Performance below 4,000 was good, no holes in the torque curve. It reminded me of my old Yamaha 250 two stroke that suddenly hit the powerband!
cheers
Derek Holliday
Linköping, Sweden
#4
Racer
Join Date: Mar 2002
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Yes, this is the 968s greatest advantage over the 944 series motor. It has over 200 lbft of torque through the entire rpm range. This is why it also is a superior motor to the flat 6 when the 3L has been turbocharged.
#5
Three Wheelin'
Join Date: Jul 2001
Location: San Francisco, CA Porsche: '92 968 Blk/Cashmere
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[quote]Originally posted by Tabor Kelly:
<strong>Actually, there is no big torque jump anywhere. Here is the factory dyno chart:
</strong><hr></blockquote>
I don't know how large the actual torque increase is, but there is definately a nice little kick at ~4000.
<strong>Actually, there is no big torque jump anywhere. Here is the factory dyno chart:
</strong><hr></blockquote>
I don't know how large the actual torque increase is, but there is definately a nice little kick at ~4000.
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#8
[quote]Originally posted by CBass:
<strong>Yes, this is the 968s greatest advantage over the 944 series motor. It has over 200 lbft of torque through the entire rpm range. This is why it also is a superior motor to the flat 6 when the 3L has been turbocharged.</strong><hr></blockquote>
The chart shows torque in Nm. That would be no less than 147.50 lbft.
<strong>Yes, this is the 968s greatest advantage over the 944 series motor. It has over 200 lbft of torque through the entire rpm range. This is why it also is a superior motor to the flat 6 when the 3L has been turbocharged.</strong><hr></blockquote>
The chart shows torque in Nm. That would be no less than 147.50 lbft.
#9
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I wasn't working from the chart, I was informed the motor makes more than 200 ftlbs from 2000 rpm on.
I have researched the cost of the turbo conversion, and to build a 450hp motor it would take 5-6k in work.
I have researched the cost of the turbo conversion, and to build a 450hp motor it would take 5-6k in work.
#10
[quote]Originally posted by Damian in NJ:
<strong>4000 is where the Variocam kicks in.</strong><hr></blockquote>
Actually, no. ~4000 is around when the intake manifold hits resonant frequency. ~5500 is when the valve timing switches.
<strong>4000 is where the Variocam kicks in.</strong><hr></blockquote>
Actually, no. ~4000 is around when the intake manifold hits resonant frequency. ~5500 is when the valve timing switches.
#12
[quote]Originally posted by CBass:
<strong>Something I have been meaning to ask a 968 owner sometime, how often should you replace the timing chains? Is there any room to use a heavier guage chain?</strong><hr></blockquote>
The 968 uses a timing belt, also called a cam belt.
Porsche recomends 60K miles, but many owners change it earlier just to be safe. I had mine changed at 45K miles. I have heard people suggest that 2 years also be a time to change it if you don't reach the mileage, because age is also a problem.
<strong>Something I have been meaning to ask a 968 owner sometime, how often should you replace the timing chains? Is there any room to use a heavier guage chain?</strong><hr></blockquote>
The 968 uses a timing belt, also called a cam belt.
Porsche recomends 60K miles, but many owners change it earlier just to be safe. I had mine changed at 45K miles. I have heard people suggest that 2 years also be a time to change it if you don't reach the mileage, because age is also a problem.
#14
[quote]Originally posted by Tabor Kelly:
<strong>Chris,
There is also a timing chain that connects the two cam shafts. Most owners change it at 100,000 miles, because Porsche doesn't publish an interval.</strong><hr></blockquote>
My apoligies, if that is what CBass was refering to.
<strong>Chris,
There is also a timing chain that connects the two cam shafts. Most owners change it at 100,000 miles, because Porsche doesn't publish an interval.</strong><hr></blockquote>
My apoligies, if that is what CBass was refering to.