Need for speed!!!
04-25-2003, 09:55 PM
#31
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Well, I don't know what to say. This is what I saw, I have never dynoed the car, have no idea what it's putting down, but I know it's fast. Compared to friend's cars around here (other 951's) it's quicker. The last mark on my (1986) speedo is 170 - last number is 160, there is one tick beyond that. It was past that. The tach read 7200 rpm when I shut it down. I agree that it sounds unbelievable, but that's what I saw/did. I'd love to try it again, but I don't think that I ever will, at least not until I rebuild the engine (which will be using a stand alone engine management system).
Either way, it was way too fast! I'd love to be able to run it like that on the autobahn, but that's not going to happen any time soon.
Dal.
Either way, it was way too fast! I'd love to be able to run it like that on the autobahn, but that's not going to happen any time soon.
Dal.
04-26-2003, 05:44 AM
#32
Burning Brakes
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Guys...
First of all someone said 7200rpm?? Grr? What happened to your management protection system it should cut in at 6500rpm = no more fuel into the engine!??!!
Secondly, someone mentioned mph 2 kmph conversion of X 0.92??
Land mph is not nautical mph I know we want our Porsches to fly but let’s be realistic here. The correct conversion is 1mile = 1.609km. So 162mph = 260.6kmh.
Lastly, 944 Turbo S's top speed is mainly determent by 2 things - fuel cut off @ 6500rpm and secondly, rolling off of our boosts - chip relevant – most chip manufacturers give you acceleration but play it extremely safe when it comes to power @ high rpm. I blew my gasket on stock TS years ago never mind pushing another 50bhp through it for longer periods of time. Taking above into account in 5th gear at 6500rpm 944TS would max out at 172mph = 276kmph and you would need a very steep downhill to do it. Anything else is just beer talk!
First of all someone said 7200rpm?? Grr? What happened to your management protection system it should cut in at 6500rpm = no more fuel into the engine!??!!
Secondly, someone mentioned mph 2 kmph conversion of X 0.92??
Land mph is not nautical mph I know we want our Porsches to fly but let’s be realistic here. The correct conversion is 1mile = 1.609km. So 162mph = 260.6kmh.
Lastly, 944 Turbo S's top speed is mainly determent by 2 things - fuel cut off @ 6500rpm and secondly, rolling off of our boosts - chip relevant – most chip manufacturers give you acceleration but play it extremely safe when it comes to power @ high rpm. I blew my gasket on stock TS years ago never mind pushing another 50bhp through it for longer periods of time. Taking above into account in 5th gear at 6500rpm 944TS would max out at 172mph = 276kmph and you would need a very steep downhill to do it. Anything else is just beer talk!
04-26-2003, 11:29 AM
#34
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Like i said, mine's chipped. Redline moved to 7500 rpm.
I am not going to argue about how fast I went, I'm just reporting what I saw on the tach and the speedo. I don't know if there was clutch slippage (it was new with about 1000 miles on it - turbo S clutch) or tire slippage, or whatever. I saw 7200 rpm on the tach and it was past the last mark on the speedo. That's all. It was on a very flat stretch of road with no other traffic around, moonlit night.
I only did it once, and don't plan on doing it again (until after the rebuild - most likely on a high speed track that time).
I agree with your points on the boost rolling off, and the thoughts that the turbos can't boost that high, but this is what I saw. It may have been a fluke, but it's a fast car. There are stories from the factory that they had some "breathed on" cars that would top 190 MPH. Why is it so difficult to believe that a car in excellent condition with the right setup can't do just that?
As for beer, yes please. I miss good beer in the States. I usually wait until I go back up to Canada and bring a few flats back down with me to tide me over.
Dal.
I am not going to argue about how fast I went, I'm just reporting what I saw on the tach and the speedo. I don't know if there was clutch slippage (it was new with about 1000 miles on it - turbo S clutch) or tire slippage, or whatever. I saw 7200 rpm on the tach and it was past the last mark on the speedo. That's all. It was on a very flat stretch of road with no other traffic around, moonlit night.
I only did it once, and don't plan on doing it again (until after the rebuild - most likely on a high speed track that time).
I agree with your points on the boost rolling off, and the thoughts that the turbos can't boost that high, but this is what I saw. It may have been a fluke, but it's a fast car. There are stories from the factory that they had some "breathed on" cars that would top 190 MPH. Why is it so difficult to believe that a car in excellent condition with the right setup can't do just that?
As for beer, yes please. I miss good beer in the States. I usually wait until I go back up to Canada and bring a few flats back down with me to tide me over.
Dal.
04-26-2003, 12:26 PM
#35
Burning Brakes
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Dal, 190mph no way!
My car 1990 944TS, 56K miles, starchip - prime example. <a href="http://www.visiononair.com/carpage.htm" target="_blank">http://www.visiononair.com/carpage.htm</a>
Luke, I agree in theory 186mph in 5th at 7K rpm is possible but this is now GT2 territory with 360bhp and no boost roll-off and better drag factor! This means our cars should have at least that available at 7K rpm. Also I was told our Audi manufactured gearbox would shred to bits above 350 bhp real world, therefore I am afraid true 160 to 170mph with our modified engines is about as good as it gets.
My car 1990 944TS, 56K miles, starchip - prime example. <a href="http://www.visiononair.com/carpage.htm" target="_blank">http://www.visiononair.com/carpage.htm</a>
Luke, I agree in theory 186mph in 5th at 7K rpm is possible but this is now GT2 territory with 360bhp and no boost roll-off and better drag factor! This means our cars should have at least that available at 7K rpm. Also I was told our Audi manufactured gearbox would shred to bits above 350 bhp real world, therefore I am afraid true 160 to 170mph with our modified engines is about as good as it gets.
04-26-2003, 04:35 PM
#37
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I tend to agree that I wasn't going that fast, but that's what the tach and speedo reported. What can I say? I realistically figure somewhere in the 160's, but who knows.... No cops to pull me over and show me the radar reading...
BTW, there are stories of 190 mph factory cars.... Maybe legend, maybe myth, but they are there. i also heard that its documented somewhere in the Porsche archives.
Either way, the cars are fast enough, no matter what the true top end is like.
Yea, I love the Canadian microbreweries! The big breweries aren't as good. Yea, I'm a beer snob.
Dal.
BTW, there are stories of 190 mph factory cars.... Maybe legend, maybe myth, but they are there. i also heard that its documented somewhere in the Porsche archives.
Either way, the cars are fast enough, no matter what the true top end is like.
Yea, I love the Canadian microbreweries! The big breweries aren't as good. Yea, I'm a beer snob.
Dal.
04-26-2003, 07:44 PM
#38
Nordschleife Master
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by SimonK:
<strong>
Luke, I agree in theory 186mph in 5th at 7K rpm is possible but this is now GT2 territory with 360bhp and no boost roll-off and better drag factor! </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">O, i'm just saying, in a mechanical/physical sense, if the motor is turning at 7k and your in 5th gear, the car should be moving at 186.
I didn't say you could do it. Most 951's aren't making peak power at or near redline ( dont get me started w/ 7,5k rpm ) We dont breathe that well up top.
I doubt a "chipped" 951 could pull to 6,4k rpms in 5th gear.
BTW, i also drive a 4000S w/ the same "gearbox" except it's really only the same case <img border="0" title="" alt="[Wink]" src="wink.gif" /> . I'm on gearbox #2 for the P car. I beleive that as long as you aren't launching the car or shifting 1-2's hard. it will suffice.
<img src="http://members.rennlist.com/luke/audi2.JPG" alt=" - " />
now, our prop shafts are a different story.
I've done 3 dyno pulls in 5th gear ( to 6,4k ) and the car was held there for a fraction of a second. Nothing exploded.
I've seen factory Honda gearboxes hold 700hp
<strong>
Luke, I agree in theory 186mph in 5th at 7K rpm is possible but this is now GT2 territory with 360bhp and no boost roll-off and better drag factor! </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">O, i'm just saying, in a mechanical/physical sense, if the motor is turning at 7k and your in 5th gear, the car should be moving at 186.
I didn't say you could do it. Most 951's aren't making peak power at or near redline ( dont get me started w/ 7,5k rpm ) We dont breathe that well up top.
I doubt a "chipped" 951 could pull to 6,4k rpms in 5th gear.
BTW, i also drive a 4000S w/ the same "gearbox" except it's really only the same case <img border="0" title="" alt="[Wink]" src="wink.gif" /> . I'm on gearbox #2 for the P car. I beleive that as long as you aren't launching the car or shifting 1-2's hard. it will suffice.
<img src="http://members.rennlist.com/luke/audi2.JPG" alt=" - " />
now, our prop shafts are a different story.
I've done 3 dyno pulls in 5th gear ( to 6,4k ) and the car was held there for a fraction of a second. Nothing exploded.
I've seen factory Honda gearboxes hold 700hp
04-27-2003, 12:06 AM
#39
Nordschleife Master
Hmm. I didn't read all the recent posts on here, but I have a couple of things for your consideration.
The car's top speed will vary from day to day. Outside Air Temperature (biggie), Road inclination (biggie), optimal engine (And engine component) temperatures and Tire and wheel temps and sizes and even whether you have the sunroof or windows open will affect your Top Speed.
Gearing will definately have a huge effect too - but only if you are geared too low or too high. If the gearing is matched perfect to your HP to reach a Top Speed, you can't do much else with the gearbox. If you have a ****load of mods and are pushing above 350hp, then your top speed would definately benfit from a longer gearing ratio.
As far as speedo (in)accuracies go, I would completely throw it out the window and use a handheld GPS to get my "correct" speed. It's the most accurate you can get (when running at top speed - assuming you're travelling on a long stretch of highway...) GPS is not as accurate when you move really slow of short distances. But it is still pretty darned accurate.
The car's top speed will vary from day to day. Outside Air Temperature (biggie), Road inclination (biggie), optimal engine (And engine component) temperatures and Tire and wheel temps and sizes and even whether you have the sunroof or windows open will affect your Top Speed.
Gearing will definately have a huge effect too - but only if you are geared too low or too high. If the gearing is matched perfect to your HP to reach a Top Speed, you can't do much else with the gearbox. If you have a ****load of mods and are pushing above 350hp, then your top speed would definately benfit from a longer gearing ratio.
As far as speedo (in)accuracies go, I would completely throw it out the window and use a handheld GPS to get my "correct" speed. It's the most accurate you can get (when running at top speed - assuming you're travelling on a long stretch of highway...) GPS is not as accurate when you move really slow of short distances. But it is still pretty darned accurate.
04-27-2003, 02:48 AM
#41
Rennlist Member
After reading all posts here. I agree with most of the claims here, even Dal's. Even though I have hit 190mph in my car last month, the car clearly needed a taller fifth gear and have since found out there is one. Don't think I'm going to put one in as I don't do that too often. I actually didn't realize I was doing it. These were the conditions. It was very late on a stretch of highway. About 70 degrees. I have 265/35 18's. SO2's. Front splitter from AIR. Twin Turbo mirrors. Crazy Powerhaus motor and stock tranny with short throw. Speedo was just redone with a 220 mph reading from North Hollywood Speedo so I know it was dead on. Problem was it got there so fast (570 lb. torque) that I didn't realize I was going as fast as I was. I didn't want to take my eyes off of the road. A GSXR 750 bike and I gave a friendly race from 120 mph. He initially took my by about 4 to 5 car lengths and I then just kept pulling closer to him. I caught and passed him at 175 so I decided to see what the car could do. When I stupidly decided to take my eyes off the road I saw a definite 190, so definite it may have said 191. Too fast to look hard. RPM's were just under 7,000, not sure exactly here for the same reason. May have been 6800 or 6900. Either way, I had a considerate amount of pedal left but the RPM's stopped me. So in conclusion, a taller fifth gear would definitely help me out and we're all a little nutz...
