996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Why is redline so low

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Old Jun 29, 2014 | 11:43 AM
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Originally Posted by denversteve
Different engines are designed to have different hp/rpm ranges. You can get a Honda S2000 if you want to shift higher - but then you'll be parking a Honda every day. I wasn't surprised by the redline - it was right there on the tach before I purchased them.
I don't think the s2000 was considered a "super car" at its time, I was comparing to other comparable high performance cars.


Originally Posted by Darth GF
Think of usable rev range instead of peak rpm.

From 3k up to 7k the engine pulls like a freight train. That's a 4000rpm range to have fun with.

The S2000 engine pulls from 6k to 9k. Only 3krpm of fun.
My old elise pulled from 6k to 8.5k. Modified with a SC, pulled from 4k to 8.5k, that was actually pretty good.
An RX8 from 8.5k to 9k (and even then, it doesn't really pull) lol

I can't think of many cars with more than 4000rpm of usable power.

I'd say our car make great use of its powerband.
Actually its only to 6500 thats my point I wish it was too 7000 or 7500.
The idea of the variable cam profiles is so it can have best of both worlds, it seems almost useless here. most cars that rev to 6-6500 usually have way more lowend way before 3000k.
 
Old Jun 29, 2014 | 04:47 PM
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Originally Posted by Darth GF

I can't think of many cars with more than 4000rpm of usable power.

I'd say our car make great use of its powerband.
Any v8. Lol
 
Old Jun 29, 2014 | 05:50 PM
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Originally Posted by VGLNTE1
Any v8. Lol
Yes, and most of them have sub 7k max rpm.
The V8s with over 7k rpm limit are usually weak/er down in the low rpm. with their peak torque over 6k.

I don't think a low peak rpm is a bad thing when the power band is large. And I don't think a high rpm is good if the power band is narrow.

The gearing is also very important. The gearing on our cars is pretty tight and is a good fit for the engine. Many big V8 cars with fat power band have stupid long gears ratios (cough cough GT500). That's not any better and should be included in the analysis of the power plant.

But a simple reflash is all it takes to get the redline over 7k on the 996tt if someone wants it. For me, it's just a number on the tach. How the car performs is what matters. And from 3k rpm to cutoff, it takes a very powerful car to keep up with a reflashed X50.
 
Old Jun 29, 2014 | 05:55 PM
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Originally Posted by YJosephTT
I don't think the s2000 was considered a "super car" at its time, I was comparing to other comparable high performance cars.



Actually its only to 6500 thats my point I wish it was too 7000 or 7500.
The idea of the variable cam profiles is so it can have best of both worlds, it seems almost useless here. most cars that rev to 6-6500 usually have way more lowend way before 3000k.
Well the cut off is not at 6500. It's 6800 (or 6750), but definitely not 6500.

Do you have example of cars with 6500rpm that have way more low end? The only that comes to mind is the Viper, but it has some 8l of displacement. So yeah, better have some low end. Any other engines in mind?
 
Old Jun 29, 2014 | 06:09 PM
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^ +1. 6750 and smart money raises to 7200 with a terrific band throughout.

but that little extra bit of headroom isn't lost on me.
 
Old Jun 29, 2014 | 09:50 PM
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The V10 in my M5 makes 80% of its peak torque or more from 3,250 rpm to 8,250 rpm. It's a pretty amazing motor. That's any amazing 5,000 rpm spread that still revs to over 8,000 to take advantage of gear multiplication.

Later, Steve
 

Last edited by Steve Jarvis; Jun 29, 2014 at 10:10 PM.
Old Jun 30, 2014 | 12:17 AM
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Originally Posted by Darth GF
Well the cut off is not at 6500. It's 6800 (or 6750), but definitely not 6500.

Do you have example of cars with 6500rpm that have way more low end? The only that comes to mind is the Viper, but it has some 8l of displacement. So yeah, better have some low end. Any other engines in mind?
Like Vglante said, this is the characteristic of a regular v8 engine.
 
Old Jun 30, 2014 | 06:09 AM
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Should I add that those suggesting modern engines should look the date the 996tt went out? That car went out in 2001.

If you want to compare modern engine with it its a bit unfair. But even then, I think the little Metzger can still hold its own, especially a flashed one. And being 250rpm short of 7000rpm is not a big deal imho.
 
Old Jul 2, 2014 | 06:15 AM
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Well, the 2001 BMW M3 didn't have forced induction, so torque was a lot lower, but it made 80% of it's peak torque from approximately 2,000 rpm to almost 8,000 rpm and had an 8,000 rpm redline.

It's a little irrelevant, because that's not what the 911 turbo was built to be about. As others have said, that's why they built the GT3.

Later, Steve
 
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