Interstate Driving
#21
03-13-2008, 05:07 PM
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RE: Interstate Driving
ORIGINAL: dusty_duster
If your truck is downshifting in that tiny hill, there's something wrong with it. Maybe a clogged catalytic converter?
If your truck is downshifting in that tiny hill, there's something wrong with it. Maybe a clogged catalytic converter?
#22
03-13-2008, 05:09 PM
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RE: Interstate Driving
ORIGINAL: TheForce55555
[blockquote]quote:
ORIGINAL: TheForce55555
Those mods should help a little but not much, The best thing to do is upgrade to 3.92 or 4.10 gear ratio to make the O/D more useful
2000 RPM seems to be have a good power and decent gas mileage, and you can pull most hills without losing speed
[/blockquote]
.
I meant 2000 RPM at 60 MPH
[blockquote]quote:
ORIGINAL: TheForce55555
Those mods should help a little but not much, The best thing to do is upgrade to 3.92 or 4.10 gear ratio to make the O/D more useful
2000 RPM seems to be have a good power and decent gas mileage, and you can pull most hills without losing speed
[/blockquote]
Not in this truck, LOL. 2,000 RPM = downshifting out of OD even on the smallest little uphill grade. I'm talkin' just a little bit above what would be considered a flat surface. I've never had or witnessedthis problem in any other V8 truck I've been in. Steep hills? Sure. But not little ones
I meant 2000 RPM at 60 MPH
#23
03-14-2008, 07:57 AM
RE: Interstate Driving
it is true
and I completely agree with
that instead of talking about 3.42, 3.55, 4.56
and so forth
it is far better
to calculate the MPH you are going in each gear
and divide that by the thousands of rpm you are going.
For example
if you are going 80 mph in overdrive gear at 2000 rpm
that is 40 MPG/thousand rpm
it is true that a vehicle with different tire diameters
and trans gearsets
can confuse
like the Tundra and Ridgeline
which have high number diff gears but low number overdrives to compensate
40 mph/1000
is approximately the best 'flat highway' ratio for best fuel economy
17 mph/1000 is a good ratio for acceleration in city driving
having a transmission with 7 gears
evenly spaced up to a maximum of 40 mph/1000
is highly desirable if the trans is also reliable and durable
keep in mind that an unlocked torque converter
is like an additional gear
that varies from as high as 1.7 when the vehicle is still moving slow
to as low as 1.1 as it approaches max rpm and a gear change
and I completely agree with
that instead of talking about 3.42, 3.55, 4.56
and so forth
it is far better
to calculate the MPH you are going in each gear
and divide that by the thousands of rpm you are going.
For example
if you are going 80 mph in overdrive gear at 2000 rpm
that is 40 MPG/thousand rpm
it is true that a vehicle with different tire diameters
and trans gearsets
can confuse
like the Tundra and Ridgeline
which have high number diff gears but low number overdrives to compensate
40 mph/1000
is approximately the best 'flat highway' ratio for best fuel economy
17 mph/1000 is a good ratio for acceleration in city driving
having a transmission with 7 gears
evenly spaced up to a maximum of 40 mph/1000
is highly desirable if the trans is also reliable and durable
keep in mind that an unlocked torque converter
is like an additional gear
that varies from as high as 1.7 when the vehicle is still moving slow
to as low as 1.1 as it approaches max rpm and a gear change