Front set up figures

[Alan.UK]

Hi,

Can anyone tell me what the correct settings are for the front wheels, ie the toe-in/toe-out figures.

I think I must have knocked/changed this settings as my 67 is rapidily eating the pair of 195/65/15 up front.

Cheers
Alan

[Roland Kunz]

Hello

The old axles had a light angled trak showing like a arrow forward and the range was 10' to -20' each side maximal total 40`.

The later axles have 0°

The Sturz ( Toe ? ) is 0 to +20'

The Vorlauf is some 7°showing backward.

Hope someone understands this.

Grüsse

[Alan.UK]

Thanks Roland

I'll take the car and the details you described to a suitable place to get it sorted. I think I may also change the front tires to 185 65 15's. Has anybody experince on changing from 195 to 185 up front. Is it worth doing, how did it effect the handling....

Thanks in advance

Alan

[Roland Kunz]

Hello

You can go with the 911 - 1989 front setup.
Most garages have those data and set the track to 0° if you have lowerd the car or seldom drive with loaded trunk.

The problem with the pre 67 is the adjustment is done on the lower link.

Have some cotter pins on hand and be patient as most mechanics never have worked on such cars and need some time to understand it.
( it just works the oppesite way very simple but..)


The 185/65/15 is the direct factory replacement if you will not go to expensive vintage tires. They do not recomend 195/65 becourse on testcars some old cars showd clearance problems. So all pre 68 and 914 generally need to be checked by TÜV and signed in the new tire size ( german rules ) while for 185 Porsche sends you the "free letter".

The 185/65 are a smaller in roll diameter and will shorten your gaers. Will give a bit lower ET`s but also lower your milage and topsped.

The performancedifference between the tire brands is larger then the tire size.

Grüsse

[Alan.UK]

Thanks again for your help Grusse..

The car is booked into have the tracking done tomorrow. I will ask them to set the tracking at 0 degrees. I will also be having the new tires put on, still not sure if it will be 195 or 185's but I will be sticking with Goodyear tires as I have always found that these offer good all round performance

Will the thinner tire also reduce the amount of bump steer (car is lowered) and steering wobble as there is less tire in contact with the road ? The answer to this will decide which tire to buy.

Thanks again
Alan

[WFBowen]

Alan: Do you currently have a steering rack spacer on the car? Helps considerably with bump-steer twitches, etc. on lowered cars.

[Roland Kunz]

Hello

The tire wight is a higher factor the the wide.

The tires are very similar so the difference will not make the choice. The main difference is the final speed due to the different rolldiameter, the lowerd hight and the slight different looks.

Porsche would have recomen 195/65 if not some old cars had problems. This was done under test driving and on old cars with worn parts ( just to reflect the real marked ).

On the 914 the 195/65 didn´t passed as not all 914 have rolled fenderlips.

Both tires cost similar I think 195/65 are a bit cheaper now. ( Even Golf 4 have them stock )

The old axle setup is very critical to bump steer or other illness. the original setup will make the car very nervous but the handling benefits from it. It is even more sharper turn in. On a lowered car you maybe can´t reach 0° toe and sometimes you ain´t reach any specs. Then go as close as possible and symetrical.

Grüsse