tweakedlogic
Well-Known Member
- Joined
- November 4, 2003
- Messages
- 950
- Reaction score
- 2
- City, State
- memphis, tn
- Year, Model & Trim Level
- '92 XLT
I have 31s with stock gears w/5 speed. I took a very long trip last weekend with no stereo (damn thieves). So I had plenty of time to contemplate all the things I have done and want to do with the X.
At 70 MPH (according to Tom Tom) I'm turning around 2500 RPM. That seems high to me. If I re-geared for the tires it would turn even faster, 2800 maybe 3000 RPM.
My Rx7 turns 2500 RPM @ 70, but it has a 9000 RPM red line and very little torque below 3000.
My wife's car pulls about 2000 @ 70 (auto Malibu).
So I ask the question, aside from torque multiplication, why re-gear if the engine has to turn faster for the same speed? Wouldn't that hurt fuel economy more than the big tires?
This weekend I was playing in the Arkansas mountains with a 17' canoe strapped to the top. And lots of gear and coolers in the back. I was able to drive up every dirt and gravel roads with steep grades in second gear @ 20-25 MPH with no issues... except for the broken exhaust mount, but that doesn't count.
I know I only have 31s, but I have 33s waiting for their wheels. 33s may make more a difference I'm sure. Perhaps bogging may be more of an issue.
At 70 MPH (according to Tom Tom) I'm turning around 2500 RPM. That seems high to me. If I re-geared for the tires it would turn even faster, 2800 maybe 3000 RPM.
My Rx7 turns 2500 RPM @ 70, but it has a 9000 RPM red line and very little torque below 3000.
My wife's car pulls about 2000 @ 70 (auto Malibu).
So I ask the question, aside from torque multiplication, why re-gear if the engine has to turn faster for the same speed? Wouldn't that hurt fuel economy more than the big tires?
This weekend I was playing in the Arkansas mountains with a 17' canoe strapped to the top. And lots of gear and coolers in the back. I was able to drive up every dirt and gravel roads with steep grades in second gear @ 20-25 MPH with no issues... except for the broken exhaust mount, but that doesn't count.
I know I only have 31s, but I have 33s waiting for their wheels. 33s may make more a difference I'm sure. Perhaps bogging may be more of an issue.