Project Retrograde

For classic Porsche 911 content

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Dr_Danger
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Project Retrograde

Post by Dr_Danger »

Hi guys,
Just got myself an '78 SC. Some of you have probably seen it on Ebay at some point. It was hard to commit especialy as I live up in Highlands of scotland and the car was in Worcester. However I had a professional inspection done by Nick at PCT Porsche with full written report, did an HPI check, spoke to about 100 people and have read everything I can get my hands on about 911s. I originaly began looking for and early 911 then changed my mind to 912 and finaly arrived at a decision on a 911 SC which you can always backdate to early look.
Or Retrograde as I like to call it. In general its a solid and mechanicaly sound car with a tired interior and bits of trim. Here is a short version of PCT report on the car

Interior 4/10 - generaly poor condition, worn seats no sunroof headlining..
Bodywork 6/10 - only paint job is letting it down slightly.
Underbody 8/10 - very good for the year, evidence of outer sill replacement (done well)
Running gear 7/10 - rear discs and pads would need to be changed soon, front anti roll bar bushes worn mot failure?
Engine/Transmission 7/10 - evidence of rebuilt engine, leak free, gearbox never changed or rebuilt but works well.
A few electrical items not working ie passenger mirror, cold air fan..
Tyres are worn and are of a wrong size.

I would like to slowly convert it to an early 70s RS look. I especialy hate the spoiler and the rear bumper.
But thats for future, there are more immediate problems after driving it for 300 miles.

I have noticed that the rims are 15" shouldn't they be 16" on SC? Tyres need to be changed urgently as they are of low quality, wrong size and cracked all over the place. However 15" quality tyres especialy in the sizes I want are very hard to come by. So I probably will have to get 16" and sell the 15" ones.
Are the sizes I was told about correct? 215/55 at the front and 225/50 at the back?

I've also noticed that my car is pulling to the right under hard breaking so I will have to look into it next weekend.
The steering wheel is original with missing leather, so its a horrible sticky plastic. I think I will go for a freshly re-introduced Momo Prototipo as on 70s racers. I found the vinyl seats very hard and sticky in the hot weather so that will have to go too. The gearknob is some horrible Carbon lookalike so that goes in the bin.

Thats enough for a start...
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Mick Cliff
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Post by Mick Cliff »

I think 16's were an option on an SC.

Tyre sizes you quote are right for 6" & 7" x 16's.

I could be wrong though...
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Dr_Danger
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Location: Bedfordshire

Post by Dr_Danger »

What is the correct wheel tyre size for the 15" fuchs?
Mick Cliff
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Post by Mick Cliff »

I think they (15's) were 185/70 and 215/65
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Dr_Danger
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Post by Dr_Danger »

I measured the rims and they are 7" at the front and 8" back. I think its safe to put 225 tyres on the back and 215s or 205s at the front, just need to find out the correct wall height.
Mick Cliff
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Post by Mick Cliff »

My Replica runs 7's & 8's x 15

I use 195/65 on the front and 225/60 at the rear (after using 215/55 and 225/50 and finding them too hard/inflexible)

Reason for my 'odd' sizes? 185/70 not that easy to get hold of and 195/65 is similar rolling radius. Ditto for the rears although 215/65 fairly common by most manufacturers. 225/60 and 215/65 similar rolling radius

The little extra height I now have(about 12mm) means that I can now clear the traffic humps - my car is quite low though...
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Dr_Danger
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Post by Dr_Danger »

Thanks Mick,
I think I will go for Pirelli P6000 205/65 at the front and 225/60 at the back. I had good experience with these tyres on my Jenesen Interceptor, they are even not bad on the track.
Mick Cliff
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Post by Mick Cliff »

Did I mention that my right front tyre just touches (on three-quarter lock) the protective casing to the oil cooler...

Your car might be different. My cooler if from a later (post '84?) car
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