Discussion of Transmissions (spinoff of sticky with 6MT pics)
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Originally Posted by BriGuyMax
Please don't pollute my thread.
Im making a comment, the Nissan tranny is not very good or at least some components of it are VERY prone to failure.. i would either go Auto or a SMT Dog Box.
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Originally Posted by MRC Motorsports
You mean like you do to mine??
Im making a comment, the Nissan tranny is not very good or at least some components of it are VERY prone to failure.. i would either go Auto or a SMT Dog Box.
Im making a comment, the Nissan tranny is not very good or at least some components of it are VERY prone to failure.. i would either go Auto or a SMT Dog Box.
Do you think a car with over 600 -> 800+whp should be using the auto or the 6mt tranny? Lets say this is for a daily street driven car, not a purpose built drag or circuit race car. I am very interested in your thoughts on this.
If you do not feel it should be in this thread, please PM me with your thoughts/expereince in this.
Thanks.
--B
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Originally Posted by BamBam
Not to be a pain, but why go auto..? i know a few auto guys that have engines able to push over 600 that can't get the Z auto tranny to hold. They are either replacing it with some type of after market tranny (eg: TH400) or making the drastic move to a 6mt.
Do you think a car with over 600 -> 800+whp should be using the auto or the 6mt tranny? Lets say this is for a daily street driven car, not a purpose built drag or circuit race car. I am very interested in your thoughts on this.
If you do not feel it should be in this thread, please PM me with your thoughts/expereince in this.
Thanks.
--B
Do you think a car with over 600 -> 800+whp should be using the auto or the 6mt tranny? Lets say this is for a daily street driven car, not a purpose built drag or circuit race car. I am very interested in your thoughts on this.
If you do not feel it should be in this thread, please PM me with your thoughts/expereince in this.
Thanks.
--B
If you truely prefer the feel of shifting with a clutch, then look into a Domestic 4 or 5 speed, which would handle the HP and cost 1/3 rd of what a JDM company would rape us Import guys for..For example, you could build a TH400 to handle 1000whp for about $2000 USD, where as a comparable 6mt Dog box style tranny would cost in upwards of $6800 plus install..
We have found a partial problem with the 6MT that we feel contributes to its failure, and it has nothing to do with the Synchros,but relates to the clutch engagement and release. On a side note the 6MT internals may be similar to the R-34 6mt or the Toyota Supra 6MT..So that may be another route to take.
I would say if Nissan engineers have not yet fixed the issues 100% with the 6MT, then I would highly doubt there will be an affordable aftermarket fix in the near future, but I might be wrong.
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Thanks for the information. I will have to do a bit more research then.
The problem with the TH400 in my opinion, is that I have never driven a auto that shifted crispy, cleaning and applied the power instantly when I wanted it.
I have never driven a race prepared car, but I can't imagine it would apply the power like a standard does.
Anyway, thanks again for the info as I know it will be useful for me and others in the future.
--B
The problem with the TH400 in my opinion, is that I have never driven a auto that shifted crispy, cleaning and applied the power instantly when I wanted it.
I have never driven a race prepared car, but I can't imagine it would apply the power like a standard does.
Anyway, thanks again for the info as I know it will be useful for me and others in the future.
--B
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Originally Posted by BamBam
Thanks for the information. I will have to do a bit more research then.
The problem with the TH400 in my opinion, is that I have never driven a auto that shifted crispy, cleaning and applied the power instantly when I wanted it.
I have never driven a race prepared car, but I can't imagine it would apply the power like a standard does.
Anyway, thanks again for the info as I know it will be useful for me and others in the future.
--B
The problem with the TH400 in my opinion, is that I have never driven a auto that shifted crispy, cleaning and applied the power instantly when I wanted it.
I have never driven a race prepared car, but I can't imagine it would apply the power like a standard does.
Anyway, thanks again for the info as I know it will be useful for me and others in the future.
--B
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th350 will always shift harder than th400.
You could get a dogcut gear box for a Borgwarner t5 for 2500$, on adapting it too the vq35 i have no idea
http://www.gforcetransmissions.com/tran_gt-5.asp
You could get a dogcut gear box for a Borgwarner t5 for 2500$, on adapting it too the vq35 i have no idea
http://www.gforcetransmissions.com/tran_gt-5.asp
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Originally Posted by Eazzzzzzy
BTW ---Not to **** off BriGuy ---But the 400 is great -------BUT if u want to strickly drag ----Why the HELL not go with the Cast Iron Power Glide ????
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Originally Posted by BriGuyMax
I'm not knocking the TH400...I'm just saying it's not the topic of this thread.
A straight cut gear will help out, and a DOG ring syle gear box would be killer for drag racing,however for most the Dog box is out of reach.
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Most 350Z owners are not looking to build specific drag cars, but balanced cars for track day lapping, drag racing, and daily-drive thrashing. A domestic auto trans is not the solution for those people.
I am interested to see what develops on the 6MT modification scene. Supras and Vipers are running sub 10's with their 6MT's just fine.
And as a side note, straight cut gears (affectionally called dog boxes) are horrible for a street car. They whine like crazy (think of the reverse gear on an old Honda...and the familiar whine as you backup at higher speeds), and if the trans lasts 20K miles, you should consider yourself lucky. They are designed for racing only, and you better get really good at rev matching and double clutching on downshifts.
I am interested to see what develops on the 6MT modification scene. Supras and Vipers are running sub 10's with their 6MT's just fine.
And as a side note, straight cut gears (affectionally called dog boxes) are horrible for a street car. They whine like crazy (think of the reverse gear on an old Honda...and the familiar whine as you backup at higher speeds), and if the trans lasts 20K miles, you should consider yourself lucky. They are designed for racing only, and you better get really good at rev matching and double clutching on downshifts.
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Originally Posted by Sharif@Forged
And as a side note, straight cut gears (affectionally called dog boxes) are horrible for a street car. They whine like crazy (think of the reverse gear on an old Honda...and the familiar whine as you backup at higher speeds), and if the trans lasts 20K miles, you should consider yourself lucky. They are designed for racing only, and you better get really good at rev matching and double clutching on downshifts.
NOW ---There would be an excuse to light up a million rants, like------My trans grinds 1-2 2-3 3-4 4-5 and 5-6 also 6-5 5-4 4-3 3-2 2-1 and sometimes Reverse, is this covered under warrenty ????
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Originally Posted by Sharif@Forged
Most 350Z owners are not looking to build specific drag cars, but balanced cars for track day lapping, drag racing, and daily-drive thrashing. A domestic auto trans is not the solution for those people.
I am interested to see what develops on the 6MT modification scene. Supras and Vipers are running sub 10's with their 6MT's just fine.
And as a side note, straight cut gears (affectionally called dog boxes) are horrible for a street car. They whine like crazy (think of the reverse gear on an old Honda...and the familiar whine as you backup at higher speeds), and if the trans lasts 20K miles, you should consider yourself lucky. They are designed for racing only, and you better get really good at rev matching and double clutching on downshifts.
I am interested to see what develops on the 6MT modification scene. Supras and Vipers are running sub 10's with their 6MT's just fine.
And as a side note, straight cut gears (affectionally called dog boxes) are horrible for a street car. They whine like crazy (think of the reverse gear on an old Honda...and the familiar whine as you backup at higher speeds), and if the trans lasts 20K miles, you should consider yourself lucky. They are designed for racing only, and you better get really good at rev matching and double clutching on downshifts.
or at least reverse engineer one of these to see what they do to make them so strong.
Last edited by Julian@MRC; 02-04-2007 at 05:58 PM.
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Originally Posted by Sharif@Forged
straight cut gears (affectionally called dog boxes)
#17
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yup exactly,
also brent, my tranny shifts perfectly (th400) it bangs gears hard as hell if i want it to or it can be smooth if i shift it slower, it being all mechanical you can really tell the difference if you slam it or take it easy...
i will be putting on my stock 6 speed for the next month or two, then i plan on throwing on the Th400 again for fun!!
also brent, my tranny shifts perfectly (th400) it bangs gears hard as hell if i want it to or it can be smooth if i shift it slower, it being all mechanical you can really tell the difference if you slam it or take it easy...
i will be putting on my stock 6 speed for the next month or two, then i plan on throwing on the Th400 again for fun!!
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Too add my 2 cents, The nissan Tranny has its weakpoints. My thought is if we can improve the gearing in this car for FI that would be a great solution. I find myself when driving fast abusing 1st, 2nd, and 3rd just to go. The car revs so fast it is hard to keep up. I am tossing around the idea of a turbo 400 as I am not a die hard dragger but I like being able to jump in the car and go. If you break a turbo 400 your doing something very wrong (if the trans is built right) And lets face it I live in South Florida where all the roads are straight so gear rowing is not that important. It is not a easy choice as I have talked with so many people about this and still not sure. But if the car is street driven with a turbo 400 you can get a gearvendors overdrive to aid in fuel mileage. That is what some Supra guys are doing.
Looking forward to the feedback from everyone.
Ryan
Looking forward to the feedback from everyone.
Ryan
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Originally Posted by Audible Mayhem
yup exactly,
also brent, my tranny shifts perfectly (th400) it bangs gears hard as hell if i want it to or it can be smooth if i shift it slower, it being all mechanical you can really tell the difference if you slam it or take it easy...
I will be putting on my stock 6 speed for the next month or two, then i plan on throwing on the Th400 again for fun!!
also brent, my tranny shifts perfectly (th400) it bangs gears hard as hell if i want it to or it can be smooth if i shift it slower, it being all mechanical you can really tell the difference if you slam it or take it easy...
I will be putting on my stock 6 speed for the next month or two, then i plan on throwing on the Th400 again for fun!!
This thread (and the original it spawned off from) have really helped in my understanding of our tranny and general principals of its operation. Based on what I have been reading here, I guess I should be doing some more research on some beefed up tranny's.
--B