Purchased a '85 911 & have many, many questions

[my1st911]

Originally Posted by HarryD

my1st911:

Ulitmately it's your money, your car, your choice.

I, personally will not look to save a few $$ on a non-OEM filter after hearing Mr Steve Weiner observations below. He has seen more damaged engines/cars than I ever will.

I'd be curious to see if wix filters were in his garbage. They are of very high quality. I have a mahle on my car. I would put a wix without worry. All others I would not.

[HarryD]

Originally Posted by my1st911

Alot of people upgrade to 16 inch wheels. My 76 had 15, and I did the same thing. I would bet that most people run 205's up front, and 215 or 225 in the rear. IIRC (if i remember correctly) you had an SC model with flares, so rubbing the fenders isnt a problem for you like it is me. I would run what you have, since wider is better.

In answer to your other question about the odometer, if you have a 16, and used to have a 15, then your odometer is actually turning slower. If the axle makes 1 revolution, your 16 inch wheel actually travelled farther, but your odometer doesnt know that. I always have trouble mentally figuring that out in my head. If you had 10 inch wheels, you would go down a side street and the speedometer would register a much higher number. i could be wrong, but thats how I see it

Actually the diameter of the itself does not matter, what does matter is the overall diameter of the tire mounted on the wheel.

For my car, I am supposed to use 165-15 or 185/70-15's. They are on 15 inch wheels. A 185/70-15 tire has a rolling diameter of 25.2 inches.

When I got the car, it had 205/60-15 tires mounted. Per the tire size calculator, the rolling diameter is 24.7 inches. This means that the Speedometer reads 2% too fast or will indicate 60mph when going 58.8 mph.

I recently got a set of 16" wheels for my car and put a set of 205/55-16's on it. Now my rolling diameter is 24.9 inches. This means that the Speedometer reads 1.3% too fast or will indicate 60mph when going 59.2 mph.

For Fed's car it goes like this:

Fronts: 195/65-15 with a rolling diameter of 25" to 205/55-15 with a rolling diameter of 24.9 inches. This is a 0.4% difference, hardly enough to matter.

Rears: 215/60-15 with a rolling diameter of 25.2" to 225/50-16 with a rolling diameter of 24.9. A 1.2% change, not very different.

Lastly, in the bar right under your screenname on the right hand side is a search button. You can search in any particular forum, such as engine rebuild, turboing, or tech forum. The search field should state what you are looking for, and try not to use numbers. It doesnt like them. I always have trouble searching, but if you ask nicely, most regulars who have been here a long time will respond with more information than you were hoping for. They are good

Great advice. With time you do get better with the searches.

[avt007]

Feds, I live in BC, and I use Toyo Proxes 4 tires. They are a good rain tire, and I haven't had the slightest complaint about them. Good wear, good performance, etc.
I'd also recommend you join your local PCA chapter.This board is fantastic, but the local club can give you hands on, face to face experience and suggestions. I belong to the Canada West Region, and the guys are great.

[my1st911]

Originally Posted by HarryD

Actually the diameter of the itself does not matter, what does matter is the overall diameter of the tire mounted on the wheel.

Yes, you are 100% correct. Obviously tire size in either 15 or 16 inch comes into play. I wasn't thinking that deap into the question

[HarryD]

Originally Posted by avt007

Feds, I live in BC, and I use Toyo Proxes 4 tires. They are a good rain tire, and I haven't had the slightest complaint about them. Good wear, good performance, etc.
I'd also recommend you join your local PCA chapter.This board is fantastic, but the local club can give you hands on, face to face experience and suggestions. I belong to the Canada West Region, and the guys are great.

My first tires were Proxes 4. Wore like iron and a great road tire.

I concur that joining the local PCA chapter is a good thing to do for lots of reasons.

[feds]

Thanks guys.

I am amazed at the quality advice available on this board, sure a big help to a newbie with a million questions!! to bad investments aren't covered as well, I'd be set.

The proxies sound like they are worth investigation, nice looking too. Good suggestion on the PCA club, i'll look that up.