1998 Maxima Gear Ratio
06-09-2005, 01:28 PM
#1
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Thread Starter
Join Date: Mar 2004
Posts: 170
1998 Maxima Gear Ratio
has anyone tried changing the gear ratios in the trans? this seems like an easy way of creating low end power. i have headers, ypipe and stillen intake - teamed with a higher gear ratio my maxima should rock and still get desent gas mileage.
thanks n advance
thanks n advance
06-09-2005, 02:40 PM
#6
I don't know .. all I know is what it comes with. If you really want to mess with it and not have to crack oepn the tranny, use different size of tires.
Tire diameter = mph x gear ratio x 336 /Rpm
Gear ratio = rpm x tire diameter /Mph x 336
Tire diameter = mph x gear ratio x 336 /Rpm
Gear ratio = rpm x tire diameter /Mph x 336
have no effect on rpm vs speed. Only gear ratios do, it's a mechical system (MPH vs RPM)
06-09-2005, 03:13 PM
#17
Yes it does make a difference in torque and also rev limiter helps with the MEVI.
I do not have the time now to dig up the old threads, but if you don't believe me, I was a
like you that thought it did make a differeence, until I learned from the big dogs on the org. I also snapped that it's a mechanical system and therfore what your speedo reads and tach are related and no matter what tires you have or mods they'll always have the same relation, even though they wont be correct, they'll still have the same relation inside the cabin... unless you cahnge the gear ratios.
I do not have the time now to dig up the old threads, but if you don't believe me, I was a
like you that thought it did make a differeence, until I learned from the big dogs on the org. I also snapped that it's a mechanical system and therfore what your speedo reads and tach are related and no matter what tires you have or mods they'll always have the same relation, even though they wont be correct, they'll still have the same relation inside the cabin... unless you cahnge the gear ratios.
06-09-2005, 03:17 PM
#18
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Thread Starter
Join Date: Mar 2004
Posts: 170
um ok whatever that meant - if your motor has less strain it can affect rpm - ask the big dogs. all i know is that when i changed to headers, ypipe and intake the rpms dropped - cant explain it but thats what happened.
06-09-2005, 03:20 PM
#20
06-09-2005, 03:33 PM
#21
06-09-2005, 03:39 PM
#23
Auto = non exsistent .. Try one from an altima ... The 5A swap .. http://www.vibratesoftware.com/html_...nsmissions.htm
06-09-2005, 03:47 PM
#27
MODS that don't have anything to do with the transmission or the resulting final drive ratio will not effect rpm at a given MPH.
The formula remains the same for all ratio's
MPH=(engine RPM X Tire Radius) / (Final Gear Ratio X 168)
For you GXE guys 5speed guys:
5th= 0.795
Final Drive Ratio= 3.823
MPH=(engine RPM X Tire Radius) / (Final Gear Ratio X 168)
Engine rpm =6,550rpms
Tire Radius (inches): aspect ratio(205 X .65=133.25)X .0394 (mm to inch conv.) = 5.25in
5.25 + 15(rim size) X .5
5.25 + 7.5=12.75
Final Gear Ratio: gear ratio (3.285=1st gear) X final drive (3.823)=
12.558555
MPH = 83512.5 / .795 X 3.823 X 168
MPH = 83512.5 / 510.59988
MPH = 163.56mph@6,550rpm(about 24.97mph / 1,000rpm)
The formula remains the same for all ratio's
MPH=(engine RPM X Tire Radius) / (Final Gear Ratio X 168)
For you GXE guys 5speed guys:
5th= 0.795
Final Drive Ratio= 3.823
MPH=(engine RPM X Tire Radius) / (Final Gear Ratio X 168)
Engine rpm =6,550rpms
Tire Radius (inches): aspect ratio(205 X .65=133.25)X .0394 (mm to inch conv.) = 5.25in
5.25 + 15(rim size) X .5
5.25 + 7.5=12.75
Final Gear Ratio: gear ratio (3.285=1st gear) X final drive (3.823)=
12.558555
MPH = 83512.5 / .795 X 3.823 X 168
MPH = 83512.5 / 510.59988
MPH = 163.56mph@6,550rpm(about 24.97mph / 1,000rpm)
06-09-2005, 03:54 PM
#31
5 speed swap is the best, I'm actually in the process right now procuring all the parts.. 
Here you go ... http://maxima.dynomagic.com/thefast_others.htm
Here you go ... http://maxima.dynomagic.com/thefast_others.htm
06-09-2005, 03:55 PM
#32
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Thread Starter
Join Date: Mar 2004
Posts: 170
back to the rpm thing - i have an experiment that will prove my theory. close off you intake and stuff a rag in you exhaust pipe - just let in a minimal amount of air flow - see what happens to your rpms. motor will have to push harder to achieve same speed as before.
i really like me auto just want a little more low end power - man i would love to find a 4.17 gear for the auto maxima. i think the person that came up woth one could make some $$$$$
i really like me auto just want a little more low end power - man i would love to find a 4.17 gear for the auto maxima. i think the person that came up woth one could make some $$$$$
06-09-2005, 04:01 PM
#35
It's already at 3.7899, it would give pretty minimal gains... riding on 205/55's will give nearly the same as a 4.17 F/D do the math ...
I think your rpm theory is best described as --> the engine is at a lower rpm to make the same hp as prior to the mods, hence the engine isn't "working" as hard as it used to when going 60, 75 etc ...
Oh **** *****, it's 3.619 for the 4th gne ... 3.7899 is for the 5g ... Still the 205/55's will do the trick
I think your rpm theory is best described as --> the engine is at a lower rpm to make the same hp as prior to the mods, hence the engine isn't "working" as hard as it used to when going 60, 75 etc ...
Oh **** *****, it's 3.619 for the 4th gne ... 3.7899 is for the 5g ... Still the 205/55's will do the trick
