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| Re: [GMCnet] Power Drive [message #327288 is a reply to message #327286] |
Tue, 19 December 2017 10:26   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Sometimes, it is the exhaust note that gets our attention in a GMC. Some of
them are quite "raspy" compared to our sound deadening environment in
modern automobiles. I compare modern automobiles to appliances. Open the
door, the light comes on. No driving pleasure here. Cars should not have
automatic transmissions or self starters or power windows. Wipers, ok.
Heaters, ok. Entertainment centers, nah. If you can't crank it, you don't
need to be driving it. (Grin)
Jim Hupy
On Dec 19, 2017 7:53 AM, "Vadim Jitkov" wrote:
> This makes perfect sense. Again it all comes down to engine RPMs on these
> big block engines. Just need to get comfortable at running it differently
> than what I'm used to.
>
>
> Richard Denney wrote on Tue, 19 December 2017 05:34
>> 1. Don't use the automatic kickdown to choose a lower gear when climbing.
>> Shift down manually. This will maintain higher pressure on the clutches
> in
>> the transmission. Manny (the foremost TH425 expert) doesn't install
>> kickdown switches in his rebuilds.
>>
>> 2. Don't try to make real power at low RPMs, particularly below 2000.
>> Choose a lower gear. As Dick Paterson says to justify this
> recommendation,
>> the oil pump is only moving at half the speed of the engine.
>>
>> 3. Therefore, if the grade is so steep that you can't maintain RPMs in
> the
>> power band (2400 to 3600 RPMs, or thereabouts), slow down, manually
>> downshift, and keep the engine in the power band.
>>
>> 4. At low speeds and while accelerating, the transmission will do the
> right
>> thing.
>>
>> 5. From a stop, the stall slip of the torque converter will do what needs
>> to be done.
>>
>> 6. The GMC isn't a race car.
>>
>> Rick "we have to be the drivetrain control computer" Denney
>>
>> On Mon, Dec 18, 2017 at 11:25 PM Vadim Jitkov
>> wrote:
>>
>>>
>>>
>>> Here is a follow up question (let me know if I need to start a new
> thread
>>> for this):
>>> from the point of view of transmission, what is the best way to tackle
>>> hills on the road? In the area where I live, we have significant
> grades on
>>> nearly all our roads. We've got multiple grades of 3-4% in any
> direction
>>> we get going and some very steep grades of 6-7%. I've read that its
> best to
>>> slow down and downshift to "S" gear for tackling the grades. Should
> this
>>> be done on all climbs or just on those very hard 6-7% grades? What
> about
>>> driving in town (again lots of hills, but driving at 25-35 MPH)?
>>>
>>
>>> --
>> Rick Denney
>> 73 x-Glacier 230 "Jaws"
>> Off-list email to rick at rickdenney dot com
>> _______________________________________________
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>
>
> --
> Vadim Jitkov
> '76 Glenbrook 26'
> Pullman, WA
>
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