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LHD vs RHD - Facts and Fiction

SimonExtreme

New member
No, this is not about personal preferences. That has been done to death and the only conclusion I can draw is "each to their own" (even if RHD is better[;)])

However, Des raised some interesting questions (well, I thought they were!) so a little research was called for. So Des, to answer your questions......

1. My car does not have underseal. It seems to have been painted a very thin coat of mat black undernieth.

2. I haven't taken up the rear carpet, but I can feel what I think are the 2 harness bolt holes. I will confirm when I replace the carpet.

I then began to look up more information to see what could be learnt. 2 interesting bits of Porsche official documentation leave almost as many questions as they do answers!

Firstly, I looked at the parts book (PET). I have looled at all the pages of the body section and have identified only one difference between the parts for the rhd and lhd RS's and that is to take the power steering. Otherwise, the body is the same. In addition, the part number for a complete RS body is the same for rhd and lhd (???) and it seems you just specify which you want! Of course, a whole body was only available when they were in production.

However, it doesn't seem to be as simple as that! Under the part descrition for an RS body, it states " see workshop manual Carrera 2 body GR 50/51/53". So that is what I did next!

Those sections are titled

50 - Body, Front - Scope of conversion for 911 Carrera RS - Body in white
51 - Body, Centre - Scope of.............
53 - Body Rear - Scope.. .............. (you get the picture!)

I find it interesting that even though there is a part number for the RS body, they still direct you to that section of the workshop manual. Why? I cannot answer that but only speculate. I wonder if what they sold was a C2 body with the parts to make it into an RS one and you had to do the work.

Anyway, looking at the workshop manual is interesting and I can say that I have now checked almost everything shown in sections 50/51/53 (what did happen to section 52!!) and my car has all those bits except one! What is most suprising is the bit that is missing is something that I have been told doesn't exist on any RS, namely a bolt for a crutch strap. However, the manual shows how and where to fit one.

Going back to the PET, I can find many parts for an RS but, except for the steering rack, there are no other differences between rhd and lhd.

I have then looked and read as much other stuff as possible. It seems that Porsche only just managed to build the 1000 cars needed to be built in time for the RS to be homologated for the 92 season. There seems little doubt that the cars were built in batches and from all I can see, I suspect but cannot prove that some of the RHD cars were included in the 1000 needed for homologation. As the steering was the only "non common" element and this did not need to be homologated, there is no reason why the rhd cars wouldn't have been counted towards the target.

If anybody has production figures by "month", this would help confirm or otherwise, whether rhd cars were counted towards the 1000 cars needed for homologation. There were rhd car built before the cut off date (31/12/91). All cars were defined as being MY 1992.

So, I can hear some of you asking why is this important and even, who cares. My answer is simple. The 964 RS is becoming collectable and is increasing in value. One thing people like is history and to me, at the moment, there seems to be a lot fo speculation and hearsay. The onger the definitive story is left, the less likely of getting it right.
 
Picture below of later Cup Car "SuperCup" which was honed from the 964RS Chassis which was specially built to homolgate the N/GT SuperCup series NO C2 Conversions here.....

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Des

I am not trying to be funny about this but I want to get to the bottom of this. Please can you tell me what the difference is between a 964RS chassis specially built to homologate the N/GT Supercup cars and the rest of the 964RS cars. The 1000 needed for homologation were all built before 31/12/1991. We know there were over another 1000 built after that date. Theyw ere not built for homologation reasons but to satisfy customer demand.

I am trying to get a second verification on this but I have found one bit of information that suggests there were less than 1000 lhd 964RS's built in 1991. The figure I have is 982. If that is so, it means that the rhd cars were used for homologation purposes. I found this on an enthusiasts website and have lost the link[&:] hence looking for more info.
 
Simon they also built the widebody 3.8RS/RSR model year 93. They spun off variants to satisfy other markets including the Touring and proposed 150 RHD units for the UK but only sold 47 including the Tourings think these were all 92 Registered cars......The later Cup/N/GT/3.8/RSRSR was based on the 964RS that's why they developed it in LHD!!!!!!!!!

D367DE71AC40493F8387C33FB8FE21FA.jpg
 
All RS's (the narrow body ones) are designated 92 model year.

Many RHD's were delivered and registered in 1991. I've had a few of them.

All RS's are built on a C2 shell that has been modified by the factoiry following the description for seam welding detailed in the extracts Simon mentions (50, 51 and 53).

The extent of modifications is obviously more in the clubsport variants. But life for the cars starts as a C2 shell. They are then modified by the motrosport division. The mods are the same whether you pull a LHD or RHD shell off the line to then seam weld etc.

You all have PROPER RS's so look after them for me.

The modifications performed to the early 91 cup cars were basically formalised (sections 50, 51, 53, etc) in prepepration to build the RS's. Whether it's an early 91 cup, a 92 model year RS or later Cup the start point is the same. There are a small number of differences to the early 91 Cup shell's that differ in the later 92 model year clubsports and cups. i can just look at the shells and know which it is. I'll get my anorak and leave now.
 
Paul

Thanks for confirming what I believed I already knew but I ahve wanted to find some "official" documentation to prove it. As far as I can see, Porsche really struggled to get 1000 car made for hmologation before th cut off date of 31/12/1991 and the RHD cars built were counted in the total.

The works manual sections mentioned also state that some of the modifications are for "base" models only and where they don't say that, the mods are for "base" and "NGT" models.

The only thing I am still puzzled by is why the manual doesn't seem to show the points for the harnesses on the rear shelf. Matbe they aren't factory fitted but the most common way harnesses were done back then.
 
AFAIK there is only one bolt hole (that will take a harness eyebolt) on each side of the rear shelf one for each seat. I dont think they are specifically for race harness attachment. Lots of people however choose to use these bolt holes to mount harnesses and have a second hole drilled along side. Why no rear harness mounts? assuming what i 've said is correct! The shoulder harnesses would be connnected to the roll bar in CS and Race cars !
 
So why did Porsche bother to make the 964RS Paul, TO HOMOLOGATE future race series if all they were already doing was converting C2's?????? So yes a Widebody 964Cabriolet shares the same chassis.........964Turbo same chassis but just nodified from a C2???? That is some modifying!!

Oh and the 2.7RS was modified from the 2.4S and the 993RS modified from the 993C2 etc etc or is it all modified from the original 901........
 
I could be very wrong here but I thought that there was only one harness point in the rear shelf behind each seat also - was it not that the race harness at the time came from one point at the back and then split into two over each shoulder?
 
ORIGINAL: carreraboy

So why did Porsche bother to make the 964RS Paul, TO HOMOLOGATE future race series if all they were already doing was converting C2's?????? So yes a Widebody 964Cabriolet shares the same chassis.........964Turbo same chassis but just nodified from a C2???? That is some modifying!!

Oh and the 2.7RS was modified from the 2.4S and the 993RS modified from the 993C2 etc etc or is it all modified from the original 901........

In the words of Porsche the 964RS was a totally new evolution of the 911 .......oh yes it shared bits with its ancestors........... Oh and the 959 ........3.2 Donor?
 
Correct Jason -top of the class!

I've had the extra hole drilled in the rear shelf on my Cup Car because due to the design of the Schroth belts I could not get them tight enough (behave!) from the cage alone.

However, I have since learnt that in a heavy accident the rear parcel shelf can deform with the load........
 
Des

You really don't seem to undertsand what homologation is all about! There are many and varied reasons for homologation but they all have the same end result - to allow a certain specification of car to race. In the case of the 964RS, Porsche would not have been allowed to use the differences between the C2 and the RS unless they built 1000 cars to that spec by 31/12/1991. If you go over all the changes, it is to allow all of those. Now, some are to the "chassis" or body shell and those changes are listed, as mentioned above. Some are to other bits like the thinner glass, lighter Pu's, alli bonnet and the list goes on. Without those 1000 cars, Porsche would not have been allowed to use those changes.

You can homologate all sorts of changes to a car by building the required numbers. Depending on the class of racing and the rules in place at the time, the numbers of cars you need to build varies. For instance in the 1970's, BMW needed to build 3.0 CSL's with the infamous "batmobile wings" to allow them to be used for racing. So as not to tip off Ford, they actually had all 100 cars lined up on the last day of the year to show the homologation inspectors! Most of those cars were sold with the wing kits in the boot as it broke German road regs!

In some ways you are right. The 964RS chassis was a special for homologation but it started life as a C2. When you quote Porsche as saying " the 964RS was a totally new evolution of the 911" I think you are both getting carried away with the marketing hype at the same time not reading it for what it is. It doesn't mean that the 964RS is a totally different car. The key word is "evolution" The C2 evolved into the 964RS through well documented changes to the body shell and other components.

 
Des,

You take a C2 and modify it to make it more suited to motorsport, aka the first cups. You then formalise these changes to make them repeatable and make more for homoligation purposes. I'm just trying to help you guys with some info. Why we now talking about other models. The whole thread was just trying to dispel the myth that somehow LHD RS's is more RS than the RHD. I hope the info posted helped clarify this.

Regarding homoligation its interesting that BMW never got round to buildind and selling us an of those rather quick M3 V8 GTR beasts. At least Porsche tried to achieve their target. [;)]
 
I think the answer is in ALL of the above............thanks Paul for your help and Simon to continue to make this forum more active and interesting.........now let's go spank those 996 Go Faster Kettles on September 4th......

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CHEQUES PLEASE
 
ORIGINAL: RSR
Regarding homoligation its interesting that BMW never got round to buildind and selling us an of those rather quick M3 V8 GTR beasts. At least Porsche tried to achieve their target. [;)]
Isn't history just littered with such homologation specials where enough were built for homologation purposes but for some reason, they never ended up with customers.
 
ORIGINAL: carreraboy

.........now let's go spank those 996 Go Faster Kettles on September 4th......

82CA2DAAF46F4A3F8D7D9A9E839F5FD2.jpg
Like the picture. Do you think we are going to get a green routemaster turn up. When I was young I used to really like those because they were the ones that went out into the country. Yopu knew you were in for a special day out on one of those[:D]
 

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