3.9FD and Nismo LSD
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3.9FD and Nismo LSD
Correct me if im wrong, but this two can be used together
My question is why people dont use these with their turbo'd cars other than losing top speed?
Also I haven't found too much on this but would the same reason apply to a supercharger?
My question is why people dont use these with their turbo'd cars other than losing top speed?
Also I haven't found too much on this but would the same reason apply to a supercharger?
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With the power and early TQ you make Noah, have you considered swapping back to stock (3.5) or even the auto FD (3.3)??
OP-reason most dont do this with FI, especially turbo's is because 1st gear will be useless regarding of tire/size in the rear. And for drag racing, it may definetely require a shift to 5th where a stock geared car may finish in 4th (112mph redline at 6600rpm's)
OP-reason most dont do this with FI, especially turbo's is because 1st gear will be useless regarding of tire/size in the rear. And for drag racing, it may definetely require a shift to 5th where a stock geared car may finish in 4th (112mph redline at 6600rpm's)
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Ok well I intend on going s/c in the very near future, would this be good or bad for me. Being as that a supercharger makes constant boost whereas a turbo makes boost later?
Also what is needed to install the LSD and FD seals or anything. I have 21k on my Z right now so im not sure what is needed. Also should I be concerned if the lSD is used?
Also what is needed to install the LSD and FD seals or anything. I have 21k on my Z right now so im not sure what is needed. Also should I be concerned if the lSD is used?
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The NISMO LSD comes with all the side seals and side bearings you will need... you will need side adjust shims for installing the LSD...
For the Ring and Pinion Gear... you will need:
Front Pinion Nut
Front and Rear Pinoin Bearing
Spacer Housing
Adjust Shim
Front Pinion Seal...
all aprts can be found here...
http://mynismo.com/products/?id=5365
For the Ring and Pinion Gear... you will need:
Front Pinion Nut
Front and Rear Pinoin Bearing
Spacer Housing
Adjust Shim
Front Pinion Seal...
all aprts can be found here...
http://mynismo.com/products/?id=5365
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here is how to do the math...
i worked out the math in a thread...
I did this for the AT guys....
Ok here are my calculations on the gears:
1st - 3.540
2nd - 2.264
3rd - 1.471
4th - 1.000
5th - 0.834
Stock Tire Size 245/45/18 = Revs Per Mile = 756
FD = 3.3
FD = 3.538
FD = 3.700
FD = 3.917
Formula:
RPM / FD Gear Size / Tire RPM x 60 = Speed in MPH
RPM:
3000 RPM in 4th Gear:
3.3 @ 3000 RPM = 72.15 MPH
3.538 @ 3000 RPM = 67.29 MPH
3.700 @ 3000 RPM = 64.35 MPH
3.917 @ 3000 RPM = 60.78 MPH
3.3 @ 6000 RPM = 144.30 MPH
3.538 @ 6000 RPM = 134.59 MPH
3.700 @ 6000 RPM = 128.70 MPH
3.917 @ 6000 RPM = 121.57 MPH
Forumla for other gears:
RPM / (FD Gear Size x Tranny Gear Size) / Tire RPM x 60 = Speed in MPH
3000 RPM in 5th Gear:
3.3 @ 3000 RPM = 86.51 MPH
3.538 @ 3000 RPM = 80.71 MPH
3.700 @ 3000 RPM = 77.17 MPH
3.917 @ 3000 RPM = 72.90 MPH
3.3 @ 6000 RPM = 173.02 MPH
3.538 @ 6000 RPM = 161.42 MPH
3.700 @ 6000 RPM = 154.35 MPH
3.917 @ 6000 RPM = 144.21 MPH
6200 RPM in 1st Gear:
3.3 @ 6200 RPM = 42.12 MPH
3.538 @ 6200 RPM = 39.30 MPH
3.700 @ 6200 RPM = 37.56 MPH
3.917 @ 6200 RPM = 35.48 MPH
The 3.7 gear set works with any rear end that will work with the 3.5 or 3.9 gear set...
So, basicly all you need is a 3.5 6MT pumpkin w/ VLSD or can be used with any Aftermarket LSD that works with the 3.5 gear set...
THe 3.70 gear set is: $480 for the gear set alone... You will also need the same pinion nut, pinion seal, spacer housing, bearing, etc etc just like with the 3.5 gear set...
to date ive done half a dozen of the 3.7 gear sets into auto's...
i worked out the math in a thread...
I did this for the AT guys....
Ok here are my calculations on the gears:
1st - 3.540
2nd - 2.264
3rd - 1.471
4th - 1.000
5th - 0.834
Stock Tire Size 245/45/18 = Revs Per Mile = 756
FD = 3.3
FD = 3.538
FD = 3.700
FD = 3.917
Formula:
RPM / FD Gear Size / Tire RPM x 60 = Speed in MPH
RPM:
3000 RPM in 4th Gear:
3.3 @ 3000 RPM = 72.15 MPH
3.538 @ 3000 RPM = 67.29 MPH
3.700 @ 3000 RPM = 64.35 MPH
3.917 @ 3000 RPM = 60.78 MPH
3.3 @ 6000 RPM = 144.30 MPH
3.538 @ 6000 RPM = 134.59 MPH
3.700 @ 6000 RPM = 128.70 MPH
3.917 @ 6000 RPM = 121.57 MPH
Forumla for other gears:
RPM / (FD Gear Size x Tranny Gear Size) / Tire RPM x 60 = Speed in MPH
3000 RPM in 5th Gear:
3.3 @ 3000 RPM = 86.51 MPH
3.538 @ 3000 RPM = 80.71 MPH
3.700 @ 3000 RPM = 77.17 MPH
3.917 @ 3000 RPM = 72.90 MPH
3.3 @ 6000 RPM = 173.02 MPH
3.538 @ 6000 RPM = 161.42 MPH
3.700 @ 6000 RPM = 154.35 MPH
3.917 @ 6000 RPM = 144.21 MPH
6200 RPM in 1st Gear:
3.3 @ 6200 RPM = 42.12 MPH
3.538 @ 6200 RPM = 39.30 MPH
3.700 @ 6200 RPM = 37.56 MPH
3.917 @ 6200 RPM = 35.48 MPH
The 3.7 gear set works with any rear end that will work with the 3.5 or 3.9 gear set...
So, basicly all you need is a 3.5 6MT pumpkin w/ VLSD or can be used with any Aftermarket LSD that works with the 3.5 gear set...
THe 3.70 gear set is: $480 for the gear set alone... You will also need the same pinion nut, pinion seal, spacer housing, bearing, etc etc just like with the 3.5 gear set...
to date ive done half a dozen of the 3.7 gear sets into auto's...
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Originally Posted by dosu350
So the 3.9 has more lower end power then the 3.5? is what the z has stock a 3.5? and the lower the more top end power and higher max speed it has?
#19
Cranky FI Owner
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Originally Posted by dosu350
So what drag racers use shorter gears?