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Moderators: notoptoy, S Allen, Solex68
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Russell Roach
Alvin,
I am pretty positive that gear set is NLA and to find a used one is like finding the holy grail. If by chance you do find one it should be no problem with a five speed, however a 4 speed would pull some higher rpms enough that highway driving, in my opinion couldn't be achieved.
That being said I have seen 4.11 r and p going for around 500.00 to a 1000.00 bucks. I paid 750.00 for my 4.62 from Nismo Japan thats without a diff. Best of luck though
Russell
I am pretty positive that gear set is NLA and to find a used one is like finding the holy grail. If by chance you do find one it should be no problem with a five speed, however a 4 speed would pull some higher rpms enough that highway driving, in my opinion couldn't be achieved.
That being said I have seen 4.11 r and p going for around 500.00 to a 1000.00 bucks. I paid 750.00 for my 4.62 from Nismo Japan thats without a diff. Best of luck though
Russell
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toolsnob
r and p
Alvin.
You don't want that diff for the street do you? Herb was running a 4.11 with the KA and he had to shift it into 2nd within 10 feet of moving. Too low geared! With your setup a 3.9 would be about as low as you would want to go on the street.
My S2000 had a 4.11 I think, but it also had a 6spd.
Alexi
You don't want that diff for the street do you? Herb was running a 4.11 with the KA and he had to shift it into 2nd within 10 feet of moving. Too low geared! With your setup a 3.9 would be about as low as you would want to go on the street.
My S2000 had a 4.11 I think, but it also had a 6spd.
Alexi
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Russell Roach
Alvin,
First of all give me your tranny type I need to know if it is a 5 speed or a 4 speed then give me your tire size, next I need to know what your max rpms will be. That way I can compute your different top speedswith the different rear end ratios.
I'll give you an example of what I am talking about, my car which runs about 12.5 to 1 compression, can pull about 6500 rpms on the long front straight on one of my courses with a 4.62 rear end is going around 120 mph.
First of all I wouldn't even consider doing that in a street roadster, just for safetys sake, second unless you just have the money to burn I would leave the diff open.
Give me those figure and I'll do the math.
Russell
First of all give me your tranny type I need to know if it is a 5 speed or a 4 speed then give me your tire size, next I need to know what your max rpms will be. That way I can compute your different top speedswith the different rear end ratios.
I'll give you an example of what I am talking about, my car which runs about 12.5 to 1 compression, can pull about 6500 rpms on the long front straight on one of my courses with a 4.62 rear end is going around 120 mph.
First of all I wouldn't even consider doing that in a street roadster, just for safetys sake, second unless you just have the money to burn I would leave the diff open.
Give me those figure and I'll do the math.
Russell
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TR
Personally, I love how quiet the engine and tranny are with the 3.7 on the freeway. The car just glides along...
I know I am giving up a bit of acceleration, but I am not autocrossing the car.
Alvin, with your commute and quantity of daily driving, I'd stick with a 3.9 or 3.7. A 4.11 would give you a bit better accel, but lets be serious...How often do you drag race versus drive? I'll give up the portion of a second in the ten seconds acceleration time from 0 to freeway speed for all of the hours of constant speed driving time behind the wheel.
Personally, I'd leave the real high ratios for the guys that are racing...TR
I know I am giving up a bit of acceleration, but I am not autocrossing the car.
Alvin, with your commute and quantity of daily driving, I'd stick with a 3.9 or 3.7. A 4.11 would give you a bit better accel, but lets be serious...How often do you drag race versus drive? I'll give up the portion of a second in the ten seconds acceleration time from 0 to freeway speed for all of the hours of constant speed driving time behind the wheel.
Personally, I'd leave the real high ratios for the guys that are racing...TR
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SLOroadster
- Roadsteraholic
- Posts: 5360
- Joined: Sun Dec 08, 2002 2:53 am
- Location: Napa Ca
After going back to the 3.9 on my car, it is quite a bit better around town. I can easily get by with 3rd where as I was in 4th before. With the 4.11, I would go about 10 feet before having to find 2nd, now I can get almost 3/4 of the way across the intersection before needing to shift. I can actually use gears below 4th now. It could be that I need to make some tuning ajustments (I haven't really touched the car since the end of september), but the car is a little slower off the line. I can't wait to try the freeway with a 5th gear, perhaps by the end of the year....
Will
Will
Sorry, I find modern engine swaps revolting. Keep your G, R, or U series in your Roadster!
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TR
I hear you about the LSD, I am sure the car will launch out of turns much better (Or spin out!).
The best way to make sure about a gearset is to learn from other's mistakes, find other people on a run that have the gearset you are interested in and swap cars for a bit...
There are enough people that want a solid LSD option that we should find a rear end shop and order a bunch at once. We could probably save serious cash since the custom machining would be much, much cheaper...I am saving car funds for the 510 right now, but I would really consider it if we could get a good price.
TR
The best way to make sure about a gearset is to learn from other's mistakes, find other people on a run that have the gearset you are interested in and swap cars for a bit...
There are enough people that want a solid LSD option that we should find a rear end shop and order a bunch at once. We could probably save serious cash since the custom machining would be much, much cheaper...I am saving car funds for the 510 right now, but I would really consider it if we could get a good price.
TR
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Russell Roach
Alving,
I'll run the numbers today when I get in from work, at a glance I can tell you already that those gear ratios and r&p( your current set up) are GREAT! leave them alone. I wouldn't go higher than a 4.11 if you just have to do it.
I'll give you an example( TR is right) my first gear is a 2.08 to be usable with the 4.62 you willshoot out of the hole but have to shift darn near immediately.
Just my two cents worth
Russell
I'll run the numbers today when I get in from work, at a glance I can tell you already that those gear ratios and r&p( your current set up) are GREAT! leave them alone. I wouldn't go higher than a 4.11 if you just have to do it.
I'll give you an example( TR is right) my first gear is a 2.08 to be usable with the 4.62 you willshoot out of the hole but have to shift darn near immediately.
Just my two cents worth
Russell
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Russell Roach