350evo 3.917 gears installed....WOW!
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Joined: Mar 2005
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350evo 3.917 gears installed....WOW!
My car continues to amaze me. For those that don't know, I have an '05 G35 sedan 6MT with the following modifications:
Ported Crawford plenum
Z-tube
JWT Popcharger
Cleaned up throttlebody
Fujitsubo Legalis-R exhaust
Unorthodox crank pulley
Rogue Engineering shifter
Volk Racing 19x8.5 (fronts), 19x9.5 (rears) Gunmetal Progressive spoke wheels
Bridgestone Potenza S03 tires 245/30-19 (fronts), 275/30-19 rears
Eibach Pro kit springs
Black painted OEM grill (I took the billet one off for now).
Yesterday night I drove down to Houston, Texas to have my 350evo 3.917 gear set installed at Texas Auto Gear this morning. 6 hours later the gearset is in the car and I am rolling home. My impressions?
I haven't really gotten on it too much, but on the highway, it pulls from 80 mph to 100 mph in 5th gear in about 3 seconds flat
6th gear pull is stout as well. No more waiting for the "6MT" powerband. No more down shifting to pass other cars. Response is phenominal. This modification is the single best mod I have done to date. 30 to 50 mph 2nd gear acceleration lopped a FULL second (from 4 seconds to 3 seconds). Best of all, I only lost about 1.5 mpg coming back from Houston, when compared to the trip out there.
I highly recommend this modification to anyone who wants to stay N/A. Completely TRANSFORMS the car. If anyone is looking for a top notch installer for gearsets in Texas, give David @ Texas Auto Gear a call at 281-448-4371.
I can't wait to install the Crawford headers and high flow cats next....
Ported Crawford plenum
Z-tube
JWT Popcharger
Cleaned up throttlebody
Fujitsubo Legalis-R exhaust
Unorthodox crank pulley
Rogue Engineering shifter
Volk Racing 19x8.5 (fronts), 19x9.5 (rears) Gunmetal Progressive spoke wheels
Bridgestone Potenza S03 tires 245/30-19 (fronts), 275/30-19 rears
Eibach Pro kit springs
Black painted OEM grill (I took the billet one off for now).
Yesterday night I drove down to Houston, Texas to have my 350evo 3.917 gear set installed at Texas Auto Gear this morning. 6 hours later the gearset is in the car and I am rolling home. My impressions?
I haven't really gotten on it too much, but on the highway, it pulls from 80 mph to 100 mph in 5th gear in about 3 seconds flat
6th gear pull is stout as well. No more waiting for the "6MT" powerband. No more down shifting to pass other cars. Response is phenominal. This modification is the single best mod I have done to date. 30 to 50 mph 2nd gear acceleration lopped a FULL second (from 4 seconds to 3 seconds). Best of all, I only lost about 1.5 mpg coming back from Houston, when compared to the trip out there.
I highly recommend this modification to anyone who wants to stay N/A. Completely TRANSFORMS the car. If anyone is looking for a top notch installer for gearsets in Texas, give David @ Texas Auto Gear a call at 281-448-4371.
I can't wait to install the Crawford headers and high flow cats next....
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From: 21°18'54.33" N, 158°05'55.47" W
it's like sprockets on motorcycles. it changes the final drive giving the feel of a shorter gear ratio, giving better torque response in different power band to the gear you're in. i hope i explained that right.
plusses of changing the final drive is quicker acceleration speeds, and stronger engine braking.
plusses of changing the final drive is quicker acceleration speeds, and stronger engine braking.
This mod refers to the rear ring and pinion...
The 6MT G comes with (stock) a rearend ratio of 3.538. The 350evo rear set is a 3.917 ratio, which is approx a 10% reduction. By putting "higher ratio" gears in the cars, you end up with more low to mid end pull, but just like I've mentioned in the past, just about ANY performance mod over stock, its a give and take business - To get a little low to mid end performance, you sacrafice a little top-end, but at approx 10% the loss is minimal.
The gear set is not cheap, and yes it does sell for around $800! Is the price worth it, well parts wise NO. Gear sets usually sell for between $100 and $250 depending on application, and add anywhere from $50 to $100 for the install kit (new bearings, shims, crush washers, gaskets and so fourth). So for $800, they're VERY expensive! What's going to hurt even more is the price to instal them! Gears need to be "set up" by trained mechanics with special tools such as dial indicators and shims. Its not for your average or even novice shadetree mechanic. A simple gear swap in a common car such as a Mustang, Camaro, or something like in a Jeep for off-road use would run ya anywhere from $200 to $300 and take a few hours to do. On a car like the G, I would expect it to be twice as much and twice as long.
Off the top of my head, I would say this mod would set ya back around $1400 with the parts, shipping, and install if not more. I have done a few gear swaps myself in my trucks, and its always a pain in the rear (no pun intended)! Don't get it right and you can toast your pricey gears in a matter of a few miles. Screw the alignment up just a hair thin and they'll get noisey and you'll get the infamous gear-whine, and once they get that way, you can't fix them. There's no going back, because the metals (ring and pinion) mesh together and once the damage is done, its done! Time for another set! This is why you would ONLY want someone trained and knows what he or she is doing when you get gears isntalled!
Now for the most important question - Is it all worth it? Hell ya! Even with just a 10% reduction in ratio, this gear swap will give you in equivalent (if it were an engine mod) a solid 15-20 ponies "feel" to the rear wheels, without the risk of engine or drivetrain damage, every single day....
Congrats! I'm going to look into the install end of it and if its not too crazy, I just may give it shot ...
The 6MT G comes with (stock) a rearend ratio of 3.538. The 350evo rear set is a 3.917 ratio, which is approx a 10% reduction. By putting "higher ratio" gears in the cars, you end up with more low to mid end pull, but just like I've mentioned in the past, just about ANY performance mod over stock, its a give and take business - To get a little low to mid end performance, you sacrafice a little top-end, but at approx 10% the loss is minimal.
The gear set is not cheap, and yes it does sell for around $800! Is the price worth it, well parts wise NO. Gear sets usually sell for between $100 and $250 depending on application, and add anywhere from $50 to $100 for the install kit (new bearings, shims, crush washers, gaskets and so fourth). So for $800, they're VERY expensive! What's going to hurt even more is the price to instal them! Gears need to be "set up" by trained mechanics with special tools such as dial indicators and shims. Its not for your average or even novice shadetree mechanic. A simple gear swap in a common car such as a Mustang, Camaro, or something like in a Jeep for off-road use would run ya anywhere from $200 to $300 and take a few hours to do. On a car like the G, I would expect it to be twice as much and twice as long.
Off the top of my head, I would say this mod would set ya back around $1400 with the parts, shipping, and install if not more. I have done a few gear swaps myself in my trucks, and its always a pain in the rear (no pun intended)! Don't get it right and you can toast your pricey gears in a matter of a few miles. Screw the alignment up just a hair thin and they'll get noisey and you'll get the infamous gear-whine, and once they get that way, you can't fix them. There's no going back, because the metals (ring and pinion) mesh together and once the damage is done, its done! Time for another set! This is why you would ONLY want someone trained and knows what he or she is doing when you get gears isntalled!
Now for the most important question - Is it all worth it? Hell ya! Even with just a 10% reduction in ratio, this gear swap will give you in equivalent (if it were an engine mod) a solid 15-20 ponies "feel" to the rear wheels, without the risk of engine or drivetrain damage, every single day....
Congrats! I'm going to look into the install end of it and if its not too crazy, I just may give it shot ...
Everything that I've read states how great this mod is. However, I'd like to here about the downside(other than price). How far is your speedo off? What does the VDC do after this mod is installed? I'm most interested in how the VDC responds. I usually drive with it off, but leave it on in the rain. Thanks.
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Joined: Dec 2004
Posts: 210
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From: East Bay, California
The downside? You will be revving slightly higher in every gear. So if before you were doing 3,000RPM in 6th gear going 80Mph, with those new gears you will be revving ~3,300RPM. Other than that it will be pretty much the same as stock. But your car will be faster off the line ( or spin the tires more :-) ) and your 1/4 mile times should improve.
If you drive your car as a daily driver, or rarely go to the track, I would not replace the gears.
BTW, if you are a real manianc, this will also be reducing the top speed of the car since you will redline sooner in 6th gear. But that a minor setback for most.
If you drive your car as a daily driver, or rarely go to the track, I would not replace the gears.
BTW, if you are a real manianc, this will also be reducing the top speed of the car since you will redline sooner in 6th gear. But that a minor setback for most.
Joined: Jun 2002
Posts: 30,341
Likes: 9
From: Cambridge, Ont. Canada
But what was done if anything to correct the speedometer?
In the past I've changed rear gears, but also had to change a small gear on the speedo cable (at the tranny end). In our G, does the computer automatically compensate for the gear change?
Congrats on the new gears. I've always said, this is probably one of the best mods you can do for outright performance. Only downside is a little more noise and gas consumption.
Ducatiguy is right ----- a real good mod.
C.
In the past I've changed rear gears, but also had to change a small gear on the speedo cable (at the tranny end). In our G, does the computer automatically compensate for the gear change?
Congrats on the new gears. I've always said, this is probably one of the best mods you can do for outright performance. Only downside is a little more noise and gas consumption.
Ducatiguy is right ----- a real good mod.
C.
Well if i'm not mistaken... i think... and dont quote me on this... but arent the 350z 6mt or the track edition have differnt rear gear then the g35?
I'm sure we can use those it wont be a big difference but might be slightly cheaper in parts.
I think 5AT guys can benefit from this mod as well.
I'm sure we can use those it wont be a big difference but might be slightly cheaper in parts.
I think 5AT guys can benefit from this mod as well.
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Joined: Dec 2003
Posts: 22
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The speedo is not effected as the wheel speed are taken from the drive flanges outside the rear housing. Bang for the buck this is the best mod out there....ask anyone that has put one in their 350Z or G35. Its the rear gear that should have come in the car in the first place.
THe G35 and 350Z 6mt have a 3.5 R/P and thethe autos have a 3.3 R/P. If you have a auto car you can go to the 3.5 but also need to swap diff's from a manual car becuase the offset of the ring gear is slightly different.
Once you drive with a 3.9...you will not wanna go back to a 3.5.
Also... we are working on new complete intake manifold which should be out around X mas. This will be a complete set up made with alum and carbon and gain 30+ HP.
Cheers
BJ@350EVO.com
THe G35 and 350Z 6mt have a 3.5 R/P and thethe autos have a 3.3 R/P. If you have a auto car you can go to the 3.5 but also need to swap diff's from a manual car becuase the offset of the ring gear is slightly different.
Once you drive with a 3.9...you will not wanna go back to a 3.5.
Also... we are working on new complete intake manifold which should be out around X mas. This will be a complete set up made with alum and carbon and gain 30+ HP.
Cheers
BJ@350EVO.com
Last edited by Dwnshift; Aug 5, 2005 at 09:38 AM.
Originally Posted by Dwnshift
The speedo is not effected as the wheel speed are taken from the drive flanges outside the rear housing. Bang for the buck this is the best mod out there....ask anyone that has put one in their 350Z or G35.
1) Offered better seat of the pants acceleration thru gear 1, 2, and 3.
2) Forced a 4th gear shift ~150 short of the finish line. This caused my car ETs and MPHs to suffer. With the OEM 17s, the car finished in 3rd. I was about .05 and 1.5mph SLOWER with the DRs.
3) The speedometer was wildly off. The 17s, my speedo said 100mph just as I passed the finish line. With the 15s, it said ~110mph.
Originally Posted by DaveB
I completely disagree. While I don't have gear in my G35 5AT, I do have a set of super short 225/50 drag radials mounted on 15" rims. The DRs are 23.9" in height or about 2.3" shorter than the stock 215/55R17s. These shorter tires effectively changed my gearing by about 10% or what would be the equalivalent of a 3.6 gear. The DRs did the following things:
1) Offered better seat of the pants acceleration thru gear 1, 2, and 3.
2) Forced a 4th gear shift ~150 short of the finish line. This caused my car ETs and MPHs to suffer. With the OEM 17s, the car finished in 3rd. I was about .05 and 1.5mph SLOWER with the DRs.
3) The speedometer was wildly off. The 17s, my speedo said 100mph just as I passed the finish line. With the 15s, it said ~110mph.
1) Offered better seat of the pants acceleration thru gear 1, 2, and 3.
2) Forced a 4th gear shift ~150 short of the finish line. This caused my car ETs and MPHs to suffer. With the OEM 17s, the car finished in 3rd. I was about .05 and 1.5mph SLOWER with the DRs.
3) The speedometer was wildly off. The 17s, my speedo said 100mph just as I passed the finish line. With the 15s, it said ~110mph.
Yeah. Ideally, you should cross the 1/4 mile finish line right at the top of whatever gear you want to finish in. So in your previous case, you finished at the top of 3rd which is perfect. But the shorter tires made you finish in the middle of 4th, which isn't optimal.
It is fun to have steep gears to drive around town in, but it could be somewhat annoying on long distance driving. I remember putting 3.73 gears in the old 5.0s and it definitely felt like the car lost 1000lbs. Each gear seemed to pull soooo hard. But when driving at 70mph, it was bothersome to see the pushrod motor turn at 2500+rpms. It was just unpleasant. Now with a car and a motor as refined as the G, maybe the extra rpms won't be too much of a bother.
