4 speed 1200 ute with standard driveline 15 inch wheels, i need to know wat kind of rpm im doing on the freeway i cruise at about 90-95 kph,if someone could give me an idea that would be tops,cheers.

To answer that, we need to know the specific size of the 15 inch tires.

i am running 15*195*50

195/50-15 tires are about 22.7" diameter
918 revs per mile
1200 ute with standard driveline mean a 4.11 diff ratio, if I recall correctly
at about 90-95 kph, you should be in high gear 1:1 ratio ...

To make it easy, try 100 kph
that's 60 mph, 1 mile per minute
that's 918 revs per minute
that 918 * 4.11 = 3772 RPMs at 100 kph
3500 rpm at 90 kph

Does that sound about right? Also keep in mind that stock speedos are often 10% off, and with the larger diameter tires, your speedo could be way off.

For a stock 1200 coupe or sedan with 12" tires (21.8" diameter radials, 950 revs per mile) and 3.9 gears, we're about 3700 rpms at 100 kmh.
reference: Road & Track Road TestQuote:

thanks dd, i didnt really know how to work out,but its quite simple cheers.im on the freeway 4 about 40mins a day,do you think that im driving it a bit hard?the vehicle is well maintained and running a semi-sinthetic oil at the moment.

These engines will run all day at 5000 rpm, and indeed were designed to do so (the speed limit in USA when these cars were new was about 70-75 mph).

At a leisurely 3700 rpm, it should last at least 150,000 miles (240,000 km).

I use regular oil which is good enough, but synthetic is even better for extended high-speed operation.

If you are doing a lot of highway driving & you think that it's reving a bit high, then see if you can find a 3.9 to 1 diff from early Stanza's or you can find them in Series 1 & 2 Bluebirds that came with either an auto or a five speed. This is the most common ratio in the H165 diff.
Our little Datsuns sound about right when running somewhere near 3,500rpm in my experience, & while you shouldn't break it while cruising at 4,000 + rpm, they do start to sound a bit, well,... busy.

I used a small Smiths PMT [pod mounted tachometer] in my 1000 for many years. It is small, mounts on a flat foot that is 'sticky backed' to the steering column, & does a great job, so something like this may be a good idea if engine speeds are a wory.

ive got a 310 sunny it seems like it has lower diff ratio im gunna strip it down soon. that centre wont fit will it?ive been thinking about a cheap little tacho but im trying to save 4 my a15 rebuild which is my priority at the moment.the only half decent 1 ive seen lately was priced at $150.which is not bad these days but still too much at the moment.are the smiths pmt still available u reckon?

get d tacho, stil can use it wen u put in the A15...

I bought the PMT tacho [2 of them actually] from Repco in the early 80's & I don't know if they are still listed, but surely SOMEONE still makes a similar thing. Just ask at all the Auto parts stores, & with any luck, one of them will have just what you need.
The B310 Sunny used an H150 differential, which is not interchangeable with the 1200 ute's H165, but the original ratio in A12 powered Sunny Sedans & A14 powered Sports Wagons was 3.9 to 1 anyway. If you already have this ratio & still want something a little taller, then the A15 powered Sunny Sporrts Wagon had a 3.7 to 1 ratio. These were the last of the B310 wagons & can be a little hard to find, but they are out there.