Supercharged/TurbochargedThe increase in air/fuel pressure above atmospheric pressure in the intake system caused by the action of a supercharger or turbocharger attached to an engine.
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I don't take this as negative at all! Thank you for the feedback. I admit to knowing very little about transmissions. Can you direct me to information that some one has demonstrated this? I am interested to read about it more (please don't take it as prove it to me .. I am genuinely interested). According to my friend who knows a lot more than I do about transmissions and he's built and rebuilt a ton of them, that when people grab gears, the edges of the gears chip off, it is not an instant failure. This in itself reduces the meshing surface area which makes the gear weaker. Over time, this will break. This is how it was explained to me. I have seen it work, so I will go with that for now. If it breaks, I have one spare back up that I can build with thicker (perhaps straightcut gears). Think I read somewhere that those gears are available for our transmissions. Please send info or link so I can read up more ... I like to challenge my friends to see what they say.
My transmission post at the top of the forum has a good bit of info about it, but in short the gear detailing (or V cutting as you've heard it termed) does do what you describe. By removing the stress risers (the slag left by the hobbing process) you do reduce the likelyhood of the gear developing stress cracks from repeated cycles. Unfortunately, with gear teeth as tiny as the ones in the 4th gen transmission, even this is not enough. You will still shear the teeth off given enough torque cycles.
In some transmissions, such as DSM transmissions you can get away with just doing this because the teeth are about 2x as thick as 4th gen gear teeth, and the smaller motors generally make less torque than a boosted 3.0 or 3.5 anyways. I eventually broke two detailed gears, mardigras broke his detailed gears, etc. Given enough torque and enough cycles (time), which you will have without question (more than either of us I'm sure), those gear teeth will lay over.
With regards to shot peening, almost all OEM gears are shot peened from the factory (including ours), however, that shot peening only affects the surface of the gear. They are also almost always carburized - which also is only a surface treatment. When you detail the edges of the tooth, you grind away both the shot peening and the carburizing. Re-carburizing the gear is not practical, it would cost an unbelieveable amount of money, but shot peening is. Once you've ground away that shot peened layer on the edges of the gear teeth, it is advisable to get that layer back by having them re-peened. Unforuntately not all shot peening is created equal, there are very specific parameters with regard to media size, media velocity, media angle (the angle at which the shot impacts the gear) etc that have dramatic effects on the effectiveness of shot peening above and beyond the factory shot peening. At the shop I used to work at we saw as much as a 30% increase in burst torque capacity on a DSM gear by shot peening with specific media size at a well established velocity and angle. It can make a significant difference.
About aftermarket gearsets, PPG, PAR, and Quaife all make gear sets for our transmission. I've got the PPG set in mine as does 96sleeper, mooseq30 had the PAR set in his but he sold that trans to someone. You can't go wrong with either set. I actually just dealt with PAR in making a custom gearset for a 350Z and they were absolutely excellent to work with. There are pictures in my gearset thread at the top of the forum of my PPG gears, and pictures of mooseQ30's PAR set in his thread stickied at the top. If my pictures don't work let me know and I can re-host them, I'm well over my photobucket file sharing limit so they may go down periodically until the month cycles then they show up again, untill I surpass my bandwidth limit yet again.
__________________ 95 SE - Stock 3.0L w/ USIM - T61/P-trim @ 14.5psi - 93 octane
11.76 @ 121 - 1.82 60' - ET Street DOTs
12.15 @ 123 - 1.95 60' - Nitto DR 3.5L swap with I/Y/E
12.92 @ 104 - 1.69 60' - M&H Slicks
13.60 @ 103 - 2.15 60' - Street tires
Great info Neal. Thanks so much.... Quick question, do you know if either of those companies have a gear set developped for later-model gear boxes? Reason I ask is that my cousin and I plan on boosting his 2002 3.5 5-spd Altima and I know we will have to address that issue
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Horsepower without a skilled driver is useless......
VQ 30/35= Very Quick 3.0/3.5... Learn it, Live it, Love it.
Great info Neal. Thanks so much.... Quick question, do you know if either of those companies have a gear set developped for later-model gear boxes? Reason I ask is that my cousin and I plan on boosting his 2002 3.5 5-spd Altima and I know we will have to address that issue
They do not. How much torque does your cousin plan on putting down? Unless he's going to be putting down well in excess of about 400ft-lb then I probably would not worry about it, the 2002+ maxima and altima transmissions are a good bit stronger than the 4th gen transmission. If he is going to be putting out big-time numbers then you might consider working with PAR or PPG to get a gear set made. PAR worked with mooseQ on his 4th gen 5 speed gear box and also worked with me and my buddy to get a custom gear set for his 350z (that we incidentally just finally installed in the car last night and it works great!). Gerard at PAR is the guy to talk to. It will take significant amount of time and money, but it should never, ever break unless you're shooting for like 800wtq.
__________________ 95 SE - Stock 3.0L w/ USIM - T61/P-trim @ 14.5psi - 93 octane
11.76 @ 121 - 1.82 60' - ET Street DOTs
12.15 @ 123 - 1.95 60' - Nitto DR 3.5L swap with I/Y/E
12.92 @ 104 - 1.69 60' - M&H Slicks
13.60 @ 103 - 2.15 60' - Street tires
They do not. How much torque does your cousin plan on putting down? Unless he's going to be putting down well in excess of about 400ft-lb then I probably would not worry about it, the 2002+ maxima and altima transmissions are a good bit stronger than the 4th gen transmission. If he is going to be putting out big-time numbers then you might consider working with PAR or PPG to get a gear set made. PAR worked with mooseQ on his 4th gen 5 speed gear box and also worked with me and my buddy to get a custom gear set for his 350z (that we incidentally just finally installed in the car last night and it works great!). Gerard at PAR is the guy to talk to. It will take significant amount of time and money, but it should never, ever break unless you're shooting for like 800wtq.
Hey Neal, how much do you think i would be looking at for the 6sp? I have one in my 4th and was wondering if i should get gears .
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97 SE Auto Built Auto
97 SE Holset HX52|N2O|6 SP|Built 3.56|More to come
91 GXE Auto bone stock beater
91 GXE 5sp Another beater
Led retro's Pm me
Call me man. I may have you do a 6sp for me if you are up for it.
__________________
97 SE Auto Built Auto
97 SE Holset HX52|N2O|6 SP|Built 3.56|More to come
91 GXE Auto bone stock beater
91 GXE 5sp Another beater
Led retro's Pm me
I thought you were talking about having PAR do a custom gearset for you. I don't work at the shop any more I live in chicago now...
I know where you at but i figured between your project on your car and free time maybe you wanted to pioneer a 6sp gear set on my dime. let me know.
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97 SE Auto Built Auto
97 SE Holset HX52|N2O|6 SP|Built 3.56|More to come
91 GXE Auto bone stock beater
91 GXE 5sp Another beater
Led retro's Pm me
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1996 Nissan 240SX sold
1995 BMW 740 IL totaled
1995 Nissan Maxima SE sold
2005 Acura RSX type-s crashed
1995 Nissan 240SX blown engine
1997 Nissan Maxima GXE Current
Linear Mode
