Menu toggle

Acceleration of 996 C4 Cab

Guest

New member
I'm looking for some help in discovering the true acceleration capability of my wife's 996 C4 cab. I'm looking to understand how long a 2000 model C4 cab would take to accelerate from 70 MPH to 137 MPH startting initially in 3rd gear but accelerating foot hard to the floor and moving quickly through the gears just before the rev limit.

This is to support a defence plea of necessity in a speeding prosecution, my solicitor has asked me to gather this information.

Just for background, I was seriously assaulted by a gang of five thugs outside my home on New Year's Eve 31 December 2003. I went outside to investigate some noise and disturbance at about 20:30 and was set upon by a gang wielding bottles and knuckledusters. Our assumption is that the noise was a pretext to work out whether anyone was at home before attempting a break in. Although the event was captured on video and the police attending later believed that the pictures were so clear that they could easily identify the assailants, nobody was ever apprehended.

I spent six months undergoing treatment and physiotherapy for whiplash, prolapsed cervical disks, bruising of the bones in my left arm and shoulder and oedema of the bone marrow in my left arm. Physically I was in a mess and mentally I have found myself anxious in positions I would have felt confident in previously. By the way, I am posting this from my hotel room at the Alexandra Hospital in Cheadle where I am awaiting an operation to try and resolve some of the problems and pain I am suffering.

On 9 June last year, six months after the assault I was returning home from North Wales along the A55, after enjoying my wife's birthday on our boat with my wife and 14 month old girl, and discovering that my wife was pregnant again.

To cut a long story short we noticed a black Vauxhall pull on to the A55 at Conwy, between us and a Fiesta in front on a coned off, single line, 40MPH limit roadwork section. The black car drove very close to the Fiesta through the speed limit section and upon reaching the end of the roadworks, where the road went back to two lanes and national speed limit at Deganwy, accelerated very briskly away. My wife and I commented on the erratic driving, seeing to guys with close cropped hair and dressed in black and white we assumed they were local hoodlums.

About a mile further on we noticed them again, near the Llandudno junction, they had now slowed right down and I overtook them at about 70mph. They then pulled out behind me and proceeded to drive, latched on to my bumper for a while. Both my wife and I were very worried by this, having seen the erratic driving previously, and having decided that they were thugs and given my anxious nature after the attacks I concluded that we were in imminent danger of being "car-jacked".

I decided to put some distance between us, dropped the 996 down into 3rd gear and accelerated very, very quickly away, in a matter of about 10+ seconds I was travelling at 137MPH and had put a significant distance between myself and the black Vauxhall.

I continued to drive at this speed for something less than two miles until I reached a 50MPH limit at Colwyn Bay, where I slowed down to 50MPH, thinking that I had "lost" the other car and feeling safer because we were closer to "society" if anyone should try anything. Eventually the black car caught me up and then continued to drive on my tail, so close that I could hardly see his bonnet badge, for a further 2 miles.

My wife and I were getting quite panicky as we drove through Colwyn Bay at 50MPH for 2 miles, this takes over 2 minutes of worry, until suddenly I noticed blue flashing lights emanating from behind the grille.

The car was an unmarked Police Car!

6 months later, to the day almost I received a summons for driving at a constant speed of 122MPH on the two mile section of road from Llandudno Junction to Colwyn Bay 50 MPH speed limit. In his evidence the police driver says that he drove at a constant separation from me for a distance of 2 miles and clocked me at a steady 122MPH over this period using his speedometer.

I know that this is untrue, I left the black Vauxhall standing when I accelerated away, I know that I drove at a constant speed of 137MPH for something less than two miles.

My defence is built of two things, firstly that having experienced the assault I was overly sensitive to the danger presented by the car driving at close proximity behind me, afraid of an imminent risk of injury or death to me and my family and hence felt the necessity to escape.

Secondly that the policeman's evidence is false anyway so his testimony cannot be trusted, i.e. he did not follow me at a constant distance for 2 miles at a speed of 122 MPH.

I am not denying that I broke the speed limit. I had no reason to speed having had a lovely day with my family and discovering that my wife was pregnant again.

I am sure many other Porsche drivers may sympathise with this predicament. I have been driving Porsche cars of various types continuously since I was 25 and have a complete fetish about the beautiful beasts, fortunately my wife has been bitten by the bug too so I guess I'm a fortunate man.

So ,what I'm looking for is acceleration information for 996 Carrera 4 Cab from 70 MPH to 137MPH moving through the gears, approaching rev limit, foot hard to the floor. How long does it take?

Also deceleration time from 137 MPH to 50MPH, no wheels locking or skidding, dry surface both cases, about 21:30 in the evening after a warm day on June 9 2004. How long does this take. Can't recall the outside temperature but I was wearing shorts and a short sleeved shirt.

My court case is May 4 so a quick response will be very much appreciated.

Thanks in advance, Paul.
 
I can't see how knowing the acceleration time to 137 is going to help. Also I cant see how the defence of "I wasn't doing 122 like the police say, I was doing 137" is going to help either. By saying you were doing 122 they probably mean an average of that over that section - if they didn't stay a constant distance behind you (as you say) the only thing they could be using is VASCAR which measures average speed because it's just a timing device over a known distance. If they were it might be worth checking if they had calibrated their system as required (daily I believe - often they haven't bothered).
 
Thanks guys for the responses so far. My defence of necessity is a valid defence given the trauma I have experienced since I was assaulted. It is a question of whether the magistrates accept that my mental state justified running away from the black car which I perceived to be a threat.

The question as to the speed is relevant as it draws into question all of the police evidence and particularly supports my assertion that the car was driving erratically. They claim that I drove at a steady 122MPH over two miles rather than an average. It was measured over a distance measured between two points of known separation and by the officer reading his speedo which was a calibrated speedo. He did not use VASCAR.

I have tried accelerating from 70MPH to 137MPH in my wife's car on an airfield from 4th gear and this took 13.4 seconds, I have also tried it from third gear and it took 11.5 seconds, I can't really understand why the manual would suggest that this would take 19 seconds... seems inordinately slow, but I will check when I get home from hospital.

I will also call Porsche GB to check if they have the data on Monday.

By the way had my operation yesterday, my left arm is virtually locked at the side of the body and they have only discharged me on the understanding that I will not drive home. I am waiting for confirmation from my consultant as to how long it will be before I can drive again... and I have a court case on 4 May.
 
Sheesh! what a terrible ordeal. I do hope tou get through this nightmare both in health and in court.

IMHO, since you will be taking this information to court in your defence, you need physical evidence of "your" car's accelartion capabilities. The actual time to accelarate will be different for each car given weight changes and any possible modifications you have. For example, the book may say one thing but it doesn't assume what you have in your car. You may have removed the spare tyre (50lbs), you may be a very large guy (like me), you may have had a stack of bricks in the boot! WHat yu need to know is the stats for your car given the same weight considerations at the time you got booked.
I would schedule a visit to a good independent and pay them to dyno check your car accelartion on the rolling road at the speed/weight you mention. You can then get a print out of this information as hard evidence of your car's capability..

Best of luck with it all anyway and I wish you a quick and speedy revovery.
 
hi,
Hope youre getting a good brief!
Are you going the right way?Simple facts are they don't know what speed you were doing if they couldn't see you.
Sounds like entrapment too me after all "they" created the offence.
This could be a very political prosecution and I think you stand a good chance of being dealt with sympathetically.
My chart says 3,4,5 gears 7sec-22secs =15secs,I think its conservative.13/14 likely
I'd expect stopping down 137>50 to be around 5secs=635ft.
best of luck
peter
 
Sorry to hear of your ordeal. Cant help with the data. I dont really want to play devil's advocate but I cant see that claiming that you were doing 137mph when the police say you were doing 122mph in any way discredit's the prosecution case. Firstly, all speedos, even Porsche ones, over read (on some makes of cars typically by 10%) so what might have appeared to you to be 137mph might be as low as 123mph in reality. Secondly, I cant see that you could have kept up an average of exactly 137mph for 2 miles. One hopes that for some of the time you had your eyes on the road not the speedo and therefore your speed would have fluctuated
This is only a personal opinion but trying to discredit the police when you're going to be found guilty of speeding anyway will only harm any plea for mitigation. Much better to plead guilty, offer an abject apology and go heavy on the assault as a reason for your actions
I hope you have a very hotshot lawyor. This website is worth a look pepipoo
 
I agree, I'm no lawyer but it would seem best to plead guilty and plead mitigation with the erratic driving behaviour, fear of assault and so on. Sounds to me like the police were tail-gating cars to try to get them to go faster and exceed the speed limit, a clear case of entrapment IMHO. Sadly, I don't think many magistrates would regard 137mph as a rational response to an unproven danger. I wouldn't go to court without someone to drive you home. Good luck though...
 


http://news.bbc.co.uk/1/hi/wales/north_east/4482215.stm


[FONT=Times New Roman"]"Most of the money will go to the police, with the rest going to magistrates courts, the Highways Authority and the Treasury"[FONT=verdana,geneva"]

Don't expect a fair trial.

[FONT=Times New Roman"]""Nobody makes any money out of this," added the organisation's spokeswoman." [FONT=verdana,geneva"]

What about all those people who work for the partnership?

Good luck, but get a good motoring lawyer.

Tony
 

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Back
Top