VHR + FD Gear Ratio upgrades - 3.9 and 4.08

mpp9 · 11-07-2009, 03:28 AM

I read on a 350z forum that an upgraded lsd is required to be able to handle the power from 4.08 gearing and bolt ons. 1st and 2nd gear just spin even with the viscous let alone the open diff that I have in mine right now. If that's even remotely true it'll affect us more having more power stock and making more power from bolton's than 350 hrs. Z eliminator said he had trouble getting traction from the 1 to 2 shift dragging but his is an automatic which is going to be harder to deal with than a manual I'd guess. Anyone think it's a waste to buy the gearing without going with a better lsd? Quaife, Kaaz, nismo, etc.

Z1Performance · 11-07-2009, 04:52 PM

Quote:

Originally Posted by mpp9

I read on a 350z forum that an upgraded lsd is required to be able to handle the power from 4.08 gearing and bolt ons. 1st and 2nd gear just spin even with the viscous let alone the open diff that I have in mine right now. If that's even remotely true it'll affect us more having more power stock and making more power from bolton's than 350 hrs. Z eliminator said he had trouble getting traction from the 1 to 2 shift dragging but his is an automatic which is going to be harder to deal with than a manual I'd guess. Anyone think it's a waste to buy the gearing without going with a better lsd? Quaife, Kaaz, nismo, etc.

Any aftermarket diff will improve traction, but the bulk of any spinning issue is in the tire/launch technique, and alignment. The aftermarket diffs really shine in the turns

That being said, an aftermarket lsd is a very, very worthwhile upgrade on any Z, especially if it's a base, but even vs the stock viscous (which is no bueno as it is). It all comes down to budget ultimately

racerxj17 · 11-07-2009, 06:40 PM

can someone provide a solid list of what install kit and gears are needed with part numbers? lots of people want to do this. IIRC the speedo is not affected correct?

mpp9 · 11-07-2009, 07:20 PM

Quote:

Originally Posted by Z1Performance

Any aftermarket diff will improve traction, but the bulk of any spinning issue is in the tire/launch technique, and alignment. The aftermarket diffs really shine in the turns

That being said, an aftermarket lsd is a very, very worthwhile upgrade on any Z, especially if it's a base, but even vs the stock viscous (which is no bueno as it is). It all comes down to budget ultimately

So ur saying the car handle the power in a straight line given good tires and driver? Im just worried 1st gear will be useless until i upgrade to a better lsd which is over a grand without install.

11-07-2009, 06:40 PM	#3 (permalink)
racerxj17 Track Member Join Date: Apr 2009 Location: Socal Posts: 555 Drives: 09 370z Rep Power: 19	can someone provide a solid list of what install kit and gears are needed with part numbers? lots of people want to do this. IIRC the speedo is not affected correct? __________________ 2009 PW Sport/Touring/Nav M6 Stillen Gen 3 Intake/CBE/Berk HFC/BC BR Coil over/Phillips 6500k/Hotchkis Sways/Stillen oil cooler/B&M SS

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11-07-2009, 03:28 AM	#1 (permalink)
mpp9 Base Member Join Date: Apr 2009 Location: Pittsburgh Posts: 103 Drives: 2012 sti Rep Power: 18	I read on a 350z forum that an upgraded lsd is required to be able to handle the power from 4.08 gearing and bolt ons. 1st and 2nd gear just spin even with the viscous let alone the open diff that I have in mine right now. If that's even remotely true it'll affect us more having more power stock and making more power from bolton's than 350 hrs. Z eliminator said he had trouble getting traction from the 1 to 2 shift dragging but his is an automatic which is going to be harder to deal with than a manual I'd guess. Anyone think it's a waste to buy the gearing without going with a better lsd? Quaife, Kaaz, nismo, etc.