Re: Shifting tactics?
- From: ag564@xxxxxxxxxxxxxxxxxxx (Dan Beaton)
- Date: 17 May 2007 13:40:02 GMT
"alfred" (tomboy83@xxxxxxxxx) writes:
To tell you the truth, the 1990 Mazda Miata that I had (bought new at theIn doing so, you are having the clutch disk rubbing continuously against
time) was my first car with a manual transmission. My father had a 1978 Fiat
Pininfarina Azura and an 1988 Alfa Romeo Spider Quadrofolio that I had
driven once or twice prior, but the Miata was my real learning car. I
learned on it and still the clutch lasted me till 75,000 miles. When I would
shift I would always bring the rpms to 4000-4500 which I considered to be a
good shifting point for any gear. My father used to also shift at high rpms.
A couple of things I was wondering if they are safe for the clutch and
transmission:
1. Is it okay to hold the car with the clutch and accelerator on a steep
hill to prevent roll back?
the pressure plate. That is a lot of wear. If you hold the car with the
brakes, it is static - nothing is moving, and there is no wear. So, the
answer is NO.
While the clutch pedal is depressed, the clutch is being held apart by the
2. Is it okay to ride the clutch while coasting down a hill in tight city
traffic as long as the clutch is in all the way?
throwout bearing, so there will be some wear (not a lot). However, you
have less control than if you kept it in gear, so I don't know why you
would want to do this. I have heard that in some jurisdictions, it is
illegal, and in others, it could cause you to fail a driver's test.
Matching engine speed to transmission speed makes for a smoother downshift and
3. Is there a reason why some people downshift and REV the engine just after
they shift and before they let out the clutch as opposed to just clutching,
shifting and letting out the clutch?
less stress on the synchronizers. I do it if driving aggressively.
4. What about if you are in third gear and you coast to a stop and put in
the clutch and then put it in first without going to second gear first?
No problem. Much more common though is forcing the transmission into first
before the car is stopped which is very hard on the first-gear synchro.
In regards to shift speed, a fixed speed doesn't make much sense. If driving
for economy, you want to shift up as soon as possible. On level ground and
with a modern car in North America, that might be as low as 1,000 rpm.
Uphill, or with a peaky engine, it would be higher. As long as the engine
pulls smoothly (no 'lugging'), you are fine. If driving for performance
(max acceleration), you want to be shifting close to redline (once the
engine is warm).
Dan
(This account is not used for email.)
.
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