steep downhill coasting

[jakobnev]

How many rpm in third?

[j12piprius]

I'm not sure exactly but usually shift out of 3rd at 20 mph, which is 1500 to 2000 rpm, so maybe 4200 to 5500 at 55.

[sqidd]

Originally Posted by johnlvs2run

The object is to not use the brakes, and to not wear them out.

Brake pads are cheap.

I've been down AZ89 from Prescott. According to the comments there's a 1355 drop (4400 to 3045 feet) in 8 miles, an average 3 percent drop, which I wouldn't compare to 7 percent around two 180 degree curves, and then a sharp 90 degree curve at the end of the second one. There is no way you'd be going 90 on those, not twice anyway.

I can't remember how much elevation it was (I'm not sure I ever knew really). In the description section it says 5000 to 235ft. It could be wrong.

[EDIT] I just looked it up. It drops 1735ft. We were hitting speeds well over 100mph coming down there. Couldn't tell you how fast in the middle of the corners, I was a little busy looking where I was going. Just for reference this is me riding:

Basically I'd like to know if letting the engine rev up in 3rd gear is okay.

No problem, that thing could spin at 3k for years.

Does your motor go full lean while coasting or is it still pumping fuel? If it is still pumping fuel maybe you can figure out what is less expensive, the pumped fuel, or brake pads.

[jakobnev]

No gauge?

[sqidd]

Originally Posted by jakobnev

No gauge?

Good point^^^^

If you don't have a gauge I can probably look up all the info needed to calculate it. I will just need the year, make , model, engine, trans and tire make, model and size.

[j12piprius]

The stats are in my signature. I was watching the road, not my gauges, but 55 is a good estimate of what the top speed was on the curves.

[sqidd]

Found the gearing info. What tires do you have?

1st 3.250
2nd 1.909
3rd 1.250
4th 0.909
5th 0.702

Final drive
4.058 sedan
4.250 coupe

[sqidd]

Originally Posted by johnlvs2run

The stats are in my signature. I was watching the road, not my gauges, but 55 is a good estimate of what the top speed was on the curves.

I'm just guessing here because I don't know your tire size. I guessed it at 25".

But 3rd gear at 55mph would have you at 3745rpm

[j12piprius]

It's a coupe. Altimax 175/70 R14 84 T

[j12piprius]

Originally Posted by sqidd

3rd gear at 55mph would have you at 3745rpm

Thank you! That doesn't seem very high.