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car transmission????

Lithium381

Lithium381

Lifer
Just wondering, when i shift, my RPM difference is 1k between 1-2 2-3 3-4.........but it's only 500rpm between 4-5 why is that and is that normal? wouldn't i get much higher speed potential if there was the same 1k difference?
 
your engine probably doesn't have enough torque to move the car much faster in 5 than 4
 
RPM @ MPH can vary also with tire size and axel ratio though, What I posted should be exactly what you have

I run 2200RPM @ 70MPH 285/70/R16 tires 4.10 axel and 4L60-E 1st: 3.059 2nd: 1.625 3rd: 1.000 OD: 0.696
 
Originally posted by: LAUST
RPM @ MPH can vary also with tire size and axel ratio though, What I posted should be exactly what you have

I run 2200RPM @ 70MPH 285/70/R16 tires 4.10 axel and 4L60-E 1st: 3.059 2nd: 1.625 3rd: 1.000 OD: 0.696
Click to expand...

285 WIDTH TIRES! :Q

I like your OD of 0.6...an 0.5 would be nice.

What would prevent a tranny from having a 0.2 OD or something...? Engine power isn't really needed during cruising anyway...
 
Originally posted by: mAdD INDIAN
Originally posted by: LAUST
RPM @ MPH can vary also with tire size and axel ratio though, What I posted should be exactly what you have

I run 2200RPM @ 70MPH 285/70/R16 tires 4.10 axel and 4L60-E 1st: 3.059 2nd: 1.625 3rd: 1.000 OD: 0.696
Click to expand...

285 WIDTH TIRES! :Q

I like your OD of 0.6...an 0.5 would be nice.

What would prevent a tranny from having a 0.2 OD or something...? Engine power isn't really needed during cruising anyway...
Click to expand...
And they still don't hook!!! 😉

The General Motors ZF/S6-40 6-speed is 1st: 2.640 2nd: 1.800 3rd: 1.290 4th: 1.000 5th: 0.750 6th:0.490
 
how do you find gear ratios?

Is there away to find ratios on my 95 240SX 5-spd manual tranny? OD seems pretty high..also the rear diff ratio as well.
 
I have books for some of the GM and Ford tranny's and a few great sites, plus a few that I hold onto for my father as he has had 4 or 5 Toyota's now.

Don't know about your 240SX, but your tranny is referred to as the M5, prolly get a hit in 10 minutes on a good Nissan forum 😉
 
Originally posted by: thomsbrain
i wish my car had a taller final drive. ~3400 RPM at 80 MPH is a little buzzy.
Click to expand...
That is where my zuk is at 65ish.
Originally posted by: LAUST

And they still don't hook!!! 😉
Click to expand...
Boy, I wonder why 😛

Their is a fine limit between fuel consumption at crusing. You do not want the gearing so low as to cause lugging, but you want it as low as possable for good MPG. a .2 OD would never work unless you are doing about 200 or so or have extremely high diff gears. (7+)

I bet a Diablo has a final gear in the range of high 3's low 4's though.
 
.851 is a very short overdrive, very near 1.0. That's why your rpm barely fall from 4-5, not far from 1.0.

The six speeds usually have two overdrives, 5th and 6th.

The reason auto manufacturers don't put, say, .2 top gears is that it would take a damn big transmission to even FIT a gear ratio that tall in.
 
Originally posted by: Evadman

Originally posted by: LAUST

And they still don't hook!!! 😉
Click to expand...
Boy, I wonder why 😛

Their is a fine limit between fuel consumption at crusing. You do not want the gearing so low as to cause lugging, but you want it as low as possable for good MPG. a .2 OD would never work unless you are doing about 200 or so or have extremely high diff gears. (7+)

I bet a Diablo has a final gear in the range of high 3's low 4's though.
Click to expand...
well, you know how that goes 😉
 
Originally posted by: thomsbrain
i wish my car had a taller final drive. ~3400 RPM at 80 MPH is a little buzzy.
Click to expand...

80mph, is right around 3300-3400 rpms for me too... and that's right around where my secondary injectors come on... it's like a drone... (headers don't help either)
 
Originally posted by: mAdD INDIAN
Originally posted by: LAUST
RPM @ MPH can vary also with tire size and axel ratio though, What I posted should be exactly what you have

I run 2200RPM @ 70MPH 285/70/R16 tires 4.10 axel and 4L60-E 1st: 3.059 2nd: 1.625 3rd: 1.000 OD: 0.696
Click to expand...

285 WIDTH TIRES! :Q

I like your OD of 0.6...an 0.5 would be nice.

What would prevent a tranny from having a 0.2 OD or something...? Engine power isn't really needed during cruising anyway...
Click to expand...

But HP is what is used to keep the car going. Torque is used to get going.

 
Originally posted by: Wolfie
Originally posted by: mAdD INDIAN
Originally posted by: LAUST
RPM @ MPH can vary also with tire size and axel ratio though, What I posted should be exactly what you have

I run 2200RPM @ 70MPH 285/70/R16 tires 4.10 axel and 4L60-E 1st: 3.059 2nd: 1.625 3rd: 1.000 OD: 0.696
Click to expand...

285 WIDTH TIRES! :Q

I like your OD of 0.6...an 0.5 would be nice.

What would prevent a tranny from having a 0.2 OD or something...? Engine power isn't really needed during cruising anyway...
Click to expand...

But HP is what is used to keep the car going. Torque is used to get going.
Click to expand...

That's slightly inaccurate..you need both, but since hp is a function of tq...well anyway.

during cruising you probably only need around 20hp for an average car, so its not a lot of hp. if you have gobs of torque in the low-end, you could probably cruise at 75mph at 1500RPM.

 
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