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Porsche Crest Cabriolet stability?

I know many convertibles are less stable than their hardtop counterparts, but few convertibles were designed to be just as stable as a hardtop. With that said, how stable is a 930 Cabriolet?

Also, what's the safest top speed to run with the top up on a 930 Cab? I've been told my convertible top would fly right off if I was to take my 930 Slant up to its top speed of 217 mph, but I want to know what the safest top speed is to run with the top up.

Thanks,
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1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
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Old 04-01-2014, 01:32 PM
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Top Up in Texas!!! Why?

Mine is the manual version that is manually lock up and there is no way it would come up at any speed...
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Old 04-01-2014, 03:33 PM
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217 did you do that with the top down?
Old 04-01-2014, 03:34 PM
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Quote:
Originally Posted by TheRedSlantnose View Post
I know many convertibles are less stable than their hardtop counterparts, but few convertibles were designed to be just as stable as a hardtop.
Oh, which convertibles are those? All open cars exhibit some cowl shake and/or flex.
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Last edited by onboost; 04-01-2014 at 04:06 PM..
Old 04-01-2014, 03:58 PM
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Quote:
Originally Posted by mdj930 View Post
217 did you do that with the top down?
Quote:
Originally Posted by TheRedSlantnose View Post
... I was to take my 930 Slant up to its top speed of 217 mph...

That is 19 mph more than the 2014 Porsche 991 Turbo S (limited to 198 mph). Should post the video.

The 2014 Porsche 991 Turbo S takes just 3.1 seconds from 0-100 km/h and 10.3 seconds from 0-200 km/h. The top speed of the Turbo S is limited to 318 km/h.

Road Test: 2014 Porsche 991 Turbo & Turbo S Review
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Old 04-01-2014, 03:59 PM
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Quote:
Originally Posted by TheRedSlantnose View Post
top speed of 217 mph,
Don't believe everything you've been told.
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Old 04-01-2014, 04:36 PM
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Quote:
Originally Posted by JJ 911SC View Post
Top Up in Texas!!! Why?

Mine is the manual version that is manually lock up and there is no way it would come up at any speed...
I have the power convertible top, and I actually rarely drive with the top down, even when the weather's nice to prevent any wind resistance...if there is any with the top down, that is.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 04:54 PM
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Quote:
Originally Posted by mdj930 View Post
217 did you do that with the top down?
No, I've never topped my car out before, the top speed was written in its build documents from Protomotive. The fastest I've driven it was 150 mph.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 04:58 PM
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Quote:
Originally Posted by WPOZZZ View Post
Don't believe everything you've been told.
Well, my car's top speed may seem unrealistic, but it's possible. Slants are aerodynamic and unlike many sports cars of today, they are also light. Those two things combined with 545 hp would likely make it to 217 mph.

The top speed was written in the Protomotive build documents of my car, so the cars they modify were apparently tested at some point.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 05:05 PM
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Quote:
Originally Posted by onboost View Post
Oh, which convertibles are those? All open cars exhibit some cowl shake and/or flex.
The McLaren MP4-12C convertible and the C7 Corvette convertible. Those are the only ones I know at the moment, and according to a review I read, they are the most stable of all convertibles.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 05:11 PM
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As you can figure out from my post and WPOZZZ, 217 MPH is kind of doubtful but I'll eat Humble/Crow pie if it does.

I had mine in the 200 Km/h range and its stable. Wind noise is reduce by the wind screen so there is almost no air inside the cab.

Cabs are made to ridden with the top down and in real life if you lose a few MPH so be it. Nothing like going at hight speed while earring bird signing from the overhead wires...
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Old 04-01-2014, 05:11 PM
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Quote:
Originally Posted by JJ 911SC View Post
That is 19 mph more than the 2014 Porsche 991 Turbo S (limited to 198 mph). Should post the video.

The 2014 Porsche 991 Turbo S takes just 3.1 seconds from 0-100 km/h and 10.3 seconds from 0-200 km/h. The top speed of the Turbo S is limited to 318 km/h.

Road Test: 2014 Porsche 991 Turbo & Turbo S Review
Sorry, I never drove it at top speed before The top speed info was just out of the documents my car came with when I bought it, and I only have the OEM 170 mph speedometer.
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1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 05:13 PM
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Quote:
Originally Posted by JJ 911SC View Post
As you can figure out from my post and WPOZZZ, 217 MPH is kind of doubtful but I'll eat Humble/Crow pie if it does.

I had mine in the 200 Km/h range and its stable. Wind noise is reduce by the wind screen so there is almost no air inside the cab.

Cabs are made to ridden with the top down and in real life if you lose a few MPH so be it. Nothing like going at hight speed while earring bird signing from the overhead wires...
Alright, I guess I'll see if I can book for the next Texas Mile event and see what the top speed really is
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 05:16 PM
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Just for the sake of friendly BS about realistic top speed numbers, and by way of comparison, Eddie Bello did 228.5 at the Texas Mile in 2010, and his car (1994 911 - narrow body style) has over 1200 RWHP.

Last edited by Ronnie's.930; 04-01-2014 at 05:32 PM..
Old 04-01-2014, 05:28 PM
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slim chance

I would put five bucks on the fact a "roadable" 930 will not make 217 mph, more so an open one. Mine is ok at 140, but that is a long way from 217.
Old 04-01-2014, 06:31 PM
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It could do it with the sacrifice of bottom end
maybe protomotive put in a very low ratio diff to get those numbers?

what is their 0-60 performance figures?
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Old 04-01-2014, 07:17 PM
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It'd take some very tall gears for 217. What gear sets/diff ratios does it have?

My G50 Carrera easily cruised at 140. Was quite surprised it only took about 1/4 throttle to maintain that speed.
Old 04-01-2014, 07:19 PM
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Quote:
Originally Posted by Robbbyg View Post
It could do it with the sacrifice of bottom end
maybe protomotive put in a very low ratio diff to get those numbers?

what is their 0-60 performance figures?
For the Stage 3 mods, which my car has, the 0-60 time is 3.4 seconds, and a 1/4-mile time of 10.8 seconds at 142 mph.
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1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 07:41 PM
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Quote:
Originally Posted by Tippy View Post
It'd take some very tall gears for 217. What gear sets/diff ratios does it have?

My G50 Carrera easily cruised at 140. Was quite surprised it only took about 1/4 throttle to maintain that speed.
My car has a 930 G50, but I don't really know what the gear ratios are, and the Protomotive records just say "Turbo body and gears". With a Carrera G50, the top speed would be 183 mph, as also stated in the records.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 07:43 PM
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I can provide scans of my car's Protomotive records if needed.
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Jason

1987 930 Slantnose Cabriolet, 545 hp, Guards Red- Weekend cruiser
1986 944 Turbo (951), 350+hp, Guards Red- Track car
2005 Toyota Tundra SR5 Double Cab 4x4, stock 282 hp, Silver- Daily driver
Old 04-01-2014, 07:44 PM
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