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Originally Posted by ssingri I haven't seen this discussed but the final ratios for the manual and auto seem to be different making the auto a better highway cruiser would love to get some inputs from the gurus. Further the TC gives you additional close ratios on off road tracks I don't know what that would imply maybe the off road guys can explain. |
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Originally Posted by ssingri Attached is a spec sheet for Jimmy says roughly the same thing. What surprises me is the AT seems to have a taller or overdrive final gear ratio and the manual has a 1:1 final ratio and the difference is about 30 percent. At 100 kmph manual runs at 3k rpm and the AT should run at 2300 or so. Is this true. |
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Originally Posted by Jaggu This is little more complicated and whole thread can be taken over on discussion, there is gear ratio, then transfer case that has a diff multiplier in AT and MT and then the final gear ratio. All 3 needs to be factored in. Just do a search there should be a thread somewhere here explaining this.
Attaching the full image for benefit of others who are interested. Attachment 2456554 |
Quote:
Originally Posted by ssingri I haven't seen this discussed but the final ratios for the manual and auto seem to be different making the auto a better highway cruiser would love to get some inputs from the gurus. Further the TC gives you additional close ratios on off road tracks I don't know what that would imply maybe the off road guys can explain. |
Quote:
Originally Posted by ssingri Attached is a spec sheet for Jimmy says roughly the same thing. What surprises me is the AT seems to have a taller or overdrive final gear ratio and the manual has a 1:1 final ratio and the difference is about 30 percent. At 100 kmph manual runs at 3k rpm and the AT should run at 2300 or so. Is this true. |
Quote:
Originally Posted by Jaggu This is little more complicated and whole thread can be taken over on discussion, there is gear ratio, then transfer case that has a diff multiplier in AT and MT and then the final gear ratio. All 3 needs to be factored in. Just do a search there should be a thread somewhere here explaining this.
Attaching the full image for benefit of others who are interested. Attachment 2456554 |
Gear ratios, transfer case ratios and the final drive ratio are all different for the AT and the MT; and although the AT has one less ratio the its calculated total gearing is sightly taller than the MT. In
theory that makes the AT better highway cruiser. I mentioned in theory because the calculated total gearing of the AT depends on torque converter clutch being locked without slip. The locking of the TC clutch is dependent on engine load, throttle position, operating temp etc. So
with TC locked up and
in 4th gear the 4AT Jimny will do 100Kph at a slightly lower RPM than 5MT Jimny.
In the Jimny 4AT box, the 3rd is 1:1 and 4th is an overdrive. It is interesting to note that in Jimny 5MT, the 5th is a 1:1 ratio with no overdrive. In comparison the Gypsy Kings 5MT box the 4th is 1:1 and 5th is an overdrive. But for the lack of an OD ratio the Jimny 5MT has a taller transfer case ratio and FD ratio. The total gearing of the Jimny 4AT, 5MT and Gypsy King 5MT is compared below.
Ref:
My post in (Maruti Jimny 4-door @ Auto Expo 2023) thread
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https://www.team-bhp.com/forum/attac...gear_ratio.png On the highway top gear transfer case in high
Variant - Top gear * TC Ratio * FD Ratio = Total gearing
Manual - 1.00000 * 1.00000 * 4.09000 = 4.09
4SpdAT - 0.70000 * 1.32000 * 4.30000 = 3.956 Off-road 1st gear transfer case in low
Variant - 1st gear * TC Ratio * FD Ratio = Total gearing
Manual - 4.42000 * 2.00000 * 4.09000 = 36.155
4SpdAT - 2.88000 * 2.64000 * 4.30000 = 32.693
|
MG314 total gearing. (Note: Gypsy king gear ratios are as found on the internet, pls correct and re-calculate if wrong).
Highway 5th gear TC high
5th Gear * TC High * FDR = Total gearing
0.795 * 1.409 * 3.73 = 4.178
Off-road 1st gear TC low
1st Gear * TC Low * FDR = Total gearing
3.652 * 2.268 * 3.73 = 30.894
So amongst the three, the Jimny 4AT with TC locked up should be the ideal cruiser as long as one does not need to drop a ratio for a quick overtake. The chasm is wide between the 4AT ratios and when dropping a couple of ratios for a quick overtake the engine will make its protest heard rudely.
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Originally Posted by locusjag It's most likely the same old Nissan/Jattco 405e 4 speed Torque Converter AT as we've had in the AT versions of bygone A-Star, SX4, |
The Jimny 4AT is an Aisin box. This is a longitudinally mounted
gearbox.
The old 4AT (jatco) boxes and new 6AT (aisin) boxes Maruti has sold over the years in their vehicles were transversely mounted FWD
transaxles. That is the reason why they can't "plonk" a new 6AT transaxle from the Brezza or XL6 into the Jimny. Just mentioning this here as many were asking why Maruti can't use Fronxs 6AT in the Jimny.
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Originally Posted by Samba The MotorBeam guy managed it in 23.25 seconds. He was shifting around 5,200 RPM.
On another video Faisal Khan tried the same. He reached 0-100 in roughly 19 seconds. |
Its slower by 4 to 5 seconds to 100Kph when compared to its own 3 door variant. The increased weight of the 5door has taken its toll on the engine's output. Off-road tyres (they're heavier for the same size) and other equipment will make its presence felt in a lethargic manner while on the road.