Big Tires, Bad Gearing... gear ratio issue?
#11
06-27-2012, 10:14 PM
Around town and even at lower highway speeds, I'd run it in 3rd gear to keep it from shifting in and out of overdrive.
Per the owners manual:
DRIVE (D) can be used when towing a trailer. You may
THIRD (3):
Per the owners manual:
DRIVE (D) can be used when towing a trailer. You may
want to shift the transmission to THIRD (3) or, if
necessary, a lower gear if the transmission shifts too
often under heavy loads and/or hilly conditions.
necessary, a lower gear if the transmission shifts too
often under heavy loads and/or hilly conditions.
THIRD (3):
This position is also used for normal
driving. However it reduces vehicle speed more than
DRIVE (D) without using your brakes. You might
choose THIRD (3) instead of DRIVE (D) when driving
on hilly, winding roads, when towing a trailer, so there
is less shifting between gears and when going down
choose THIRD (3) instead of DRIVE (D) when driving
on hilly, winding roads, when towing a trailer, so there
is less shifting between gears and when going down
a steep hill.
Oversize tires would mimic the hill and towing conditions.
#12
06-27-2012, 10:31 PM
I'm running Flowmaster on my T and I want louder, always thought shorter tial pipe would make it louder but it didn't. I was told to ditch the second cat and put a cherry boom in it place (02 sensor is right after the header) it it'll help. I know there a programer for the 5.3 but everyone and myself runs the PCMforless rout.
Not sure what series are out there for te cherry bombs... A baffled muffler would be louder than fiberglass packed no?
#13
06-28-2012, 12:00 AM
Around town and even at lower highway speeds, I'd run it in 3rd gear to keep it from shifting in and out of overdrive.
Per the owners manual:
DRIVE (D) can be used when towing a trailer. You may
THIRD (3):
Per the owners manual:
DRIVE (D) can be used when towing a trailer. You may
want to shift the transmission to THIRD (3) or, if
necessary, a lower gear if the transmission shifts too
often under heavy loads and/or hilly conditions.
necessary, a lower gear if the transmission shifts too
often under heavy loads and/or hilly conditions.
THIRD (3):
This position is also used for normal
driving. However it reduces vehicle speed more than
DRIVE (D) without using your brakes. You might
DRIVE (D) without using your brakes. You might
choose THIRD (3) instead of DRIVE (D) when driving
on hilly, winding roads, when towing a trailer, so there
is less shifting between gears and when going down
on hilly, winding roads, when towing a trailer, so there
is less shifting between gears and when going down
a steep hill.
Oversize tires would mimic the hill and towing conditions.
#15
06-28-2012, 12:08 AM
I would say that the tires are 80% to blame. There are other small things that could be attributed but not as massive as the rolling resistance those meats are. The stock 285 tires tipped the scales at 43lbs w/o aluminum wheels... Look up your combo and see the difference.
#16
06-28-2012, 07:05 AM
Yes, they are the primary cause of your problems. The H3 was geared to perform with 33" tires. The greatly increased diameter and weight of yours has fouled that equation. It would be like running 33" tires on a Cadillac with 2.73 gears. It too would be shifting in and out of OD and be sluggish.
Try running in 3rd gear and see if that helps out.
Try running in 3rd gear and see if that helps out.
#18
06-28-2012, 08:32 AM
Yes, they are the primary cause of your problems. The H3 was geared to perform with 33" tires. The greatly increased diameter and weight of yours has fouled that equation. It would be like running 33" tires on a Cadillac with 2.73 gears. It too would be shifting in and out of OD and be sluggish.
Try running in 3rd gear and see if that helps out.
Try running in 3rd gear and see if that helps out.
Ok so if it's 80% to blame then what can be done?
(I mean yeah 3rd would fix the shifting and help save the tranny but increase engine wear running at 3,100 rpm all the time on the highway and help out even less with mpg.)
#19
06-28-2012, 08:42 AM
SO... what's the word seasoned H3 owners? Give me the bottom line on best exhaust (its gotta have that awesome loud low grumble I've got now.... the guy whole sold it to me said he had already tried flow master and magnaflow, and they were just too quiet -- also it'd be nice if the suggested exhaust doesn't trip my check engine light).
AND... what's the best super chip? HollaBack.
AND... what's the best super chip? HollaBack.
Superchips Cortex Programmer allows the flexibility of changing the tune any time you want, ... or a PCMforless mail order PCM tune.
#20
06-28-2012, 10:49 AM
Is it just me or is your spare much smaller than your 37" tires? If that is the case, you might as well leave the spare off & save some weight. That might help your MPG marginally - OK maybe trivially.
Running a 33" spare with three 37" tires is likely to do some serious violence to your rig.
Running a 33" spare with three 37" tires is likely to do some serious violence to your rig.