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Old 04-21-2014, 11:47 AM   #61
DonaldE
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Quote:
Originally Posted by Mango View Post
What BMW diff would be lower ratio than a 2.93??? Why would he want to swap the diff already in his automatic equipped 330 (which is a 3.38?) just curious
Quote:
Originally Posted by Mango View Post
"A vehicle's rear axle ratio is numerically expressed. A higher number denotes a lower ratio. For example, if the axle ratios were listed as 3.31:1 and 3.42:1 and 3.55:1 and 4.10:1, the lowest ratio of the four gears is 4.10:1. The lower the gear ratio, the more rpm required to maintain a given speed with equivalent tire sizes."

What gear ratio do I need?
Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel.

Gear ratio is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear. The higher the number, the lower the ratio: a 5.29 gear has a lower ratio than a 4.10 gear. With a lower gear ratio the drive shaft (and thus the engine) turns more for each revolution of the wheel, delivering more power and torque to the wheel for any given speed. Lower ratios are generally desirable when going off-road. Higher ratios are better for freeway driving since they run at lower RPM’s and offer better fuel economy.

"Changing tire size affects the final drive ratio. Switching from a 30" tire to a 35" tire changes the final drive ratio by about 17%. This may drop the engine out of its' "power band" and result in poor performance and fuel economy. To restore performance you must change the gear ratio to compensate for the change in tire size. If you originally had 3.07 gears you need a ratio that is approximately 17% lower, such as 3.55. If you want to increase off road performance you might want a 4.10 or lower ratio."

http://www.ringpinion.com/TechnicalHelp/TechHelp.aspx

http://www.provenforce.com/rear_end/rear_end_cat.html

Read more: http://www.ehow.com/list_7684420_rea...#ixzz2zToDezNY

http://www.trucktestdigest.com/axle%20ratios.htm

http://www.raceline.co.uk/products/i...p?categoryID=6

http://www.automedia.com/Differentia...ht20011201rg/1

http://www.pencilgeek.org/2008/11/ch...final-dri.html

http://www.4wd.com/jeep-advisors/dri...n-advisor.aspx

http://www.442.com/oldsfaq/ofdif.htm

http://www.ehow.com/list_7684420_rea...s-gas-mpg.html

If you had all this knowledge about a 3.38 being lower than a 2.93 DESPITE being the "higher number", then why did you ask what diff would be a lower ratio....

Looks like your compensating for asking a stupid question to begin with...
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Old 04-21-2014, 12:27 PM   #62
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Please guys enough with the diff ratios. It's totally irrelevant, and not helpful.
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Old 04-21-2014, 12:56 PM   #63
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Don't worry. As soon as mango is made to look wrong, he just whines and had all the posts deleted anyway. You're silly to think buying this car is a good idea.
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Old 04-21-2014, 12:59 PM   #64
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Quote:
Originally Posted by DonaldE View Post
If you had all this knowledge about a 3.38 being lower than a 2.93 DESPITE being the "higher number", then why did you ask what diff would be a lower ratio....

Looks like your compensating for asking a stupid question to begin with...
Sounds like you may be a little dense here. That wasn't me actually asking an actual question.
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Old 04-21-2014, 01:09 PM   #65
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"A higher number denotes a lower ratio"

HAHAHAHHAHAHA. Dumbest statement of all time. I don't care what your bullshit sources are for that. If you look at Wikipedia it actually avoids using the terms higher or lower ratio because too many people, who have no sense of numerical conventions, got things mixed.

The only reason things ended up like this was because some shade tree mechanics couldn't understand the concept that as you shift gears up (in the tranny) that the ratio actually lowers.

Nowhere ever in the history of the English language will a lower number ever be referred to as higher.


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sounds like you just got caught with your pants down, man. just be mature about it and move on. I'm all for correct information as I'm genuinely interested about this. props to mango for delivering. good sources.
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Old 04-21-2014, 01:14 PM   #66
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Don't worry. As soon as mango is made to look wrong, he just whines and had all the posts deleted anyway. You're silly to think buying this car is a good idea.
You are referring to the one with the blown tranny? The one I already passed on?

Or the one with the blown motor?

I'm going to take a look at the one with the blown motor later this week, I'll take pictures and get as much info as I can on it.
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Old 04-21-2014, 01:15 PM   #67
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As OP said, end it.

Mango, why do you have an alternate account where you go around posting to support your own views?
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Old 04-21-2014, 01:53 PM   #68
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i'll take that 330i if it's 1500..
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Old 04-21-2014, 01:53 PM   #69
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Sounds like you may be a little dense here. That wasn't me actually asking an actual question.
I'm dying to hear how this wasn't an actual question.
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Old 04-21-2014, 02:45 PM   #70
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I still stand by what I said and believe the current convention of flipping things is nonsense. I will move to change it. It makes more sense my way.
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Old 04-21-2014, 03:05 PM   #71
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this whole argument is semantics and there are 4 words at play here: shorter, taller, lower, higher.

3.38 is a HIGHER ratio and thus indicates SHORTER gearing. 2.93 is a LOWER ratio and thus indicates TALLER gearing. Everyone is right. Now we can move on.
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Old 04-21-2014, 03:36 PM   #72
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this whole argument is semantics and there are 4 words at play here: shorter, taller, lower, higher.

3.38 is a HIGHER ratio and thus indicates SHORTER gearing. 2.93 is a LOWER ratio and thus indicates TALLER gearing. Everyone is right. Now we can move on.
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Old 04-21-2014, 03:42 PM   #73
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shorter, taller, lower, higher.
Is that the latest Daft Punk single?
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Old 04-21-2014, 04:27 PM   #74
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Is that the latest Daft Punk single?
Lol
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Old 04-23-2014, 06:19 PM   #75
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So the 330i with the blown motor was basically damaged 360 degrees. Every corner of the car was hit, and...and...

According to the owner, someone tried to tow it from the radiator frame, and split it in half, I really should have taken a picture, it was magnificently stupid.

Apparently the motor went, because noone put coolant in it -_-

The search continues...
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Old 04-23-2014, 08:42 PM   #76
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So the 330i with the blown motor was basically damaged 360 degrees. Every corner of the car was hit, and...and...

According to the owner, someone tried to tow it from the radiator frame, and split it in half, I really should have taken a picture, it was magnificently stupid.

Apparently the motor went, because noone put coolant in it -_-

The search continues...
unfortunately i'm not that surprised. some of these cars around here were abused by people who have no business owning a car in the first place. i want you to find one though. willing to swap the manual in a more expensive vehicle or was that only a plan on a super cheap score? either way here are a few.

(manual)

http://longisland.craigslist.org/cto/4435858356.html



(auto)

http://newyork.craigslist.org/brk/cto/4418174044.html



(auto)

http://newyork.craigslist.org/fct/cto/4434618632.html



(auto)

http://newyork.craigslist.org/brx/cto/4406299457.html


(auto)

http://newyork.craigslist.org/brx/cto/4426349834.html


(unknown)

http://newjersey.craigslist.org/cto/4432381452.html
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Old 04-24-2014, 03:58 PM   #77
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The manual swap is just for a cheap score, I cant spend the money on a working 330i then swap it, I just started a new job.

And your totally right, some of these people shouldn't have bought the car in the first place, you know the types.

As soon as I met the dude, I told him there was no way I can make an offer that wouldn't be insulting and that I'm just gonna pass. I felt bad but there was nothing to be done, that car needs to be parted out :/
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Old 04-24-2014, 04:05 PM   #78
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Btw those were all Autos.

I'm honestly looking for a clean body, preferably black on black, black on tan (tan interior) is passable, and gotta be a 5 speed.

If I'm gonna work up a 330i there's no way I'm wasting the potential on an auto, this car is gonna be my fun car

PS: and before I get flamed, no I'm not using this car to run down the DPA like a schmuck, I want to autocross it.

PPS: I will however need to spank some children once in a while
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Old 04-24-2014, 05:28 PM   #79
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if you're willing to go down to a 325i/325ci your options really open up. There isn't as big a performance difference between the 2.5 and 3.0 that you might believe, although it is there. I love my 2.5 litre and I don't even have the m54 variant, just the early m52tub. the 5 speed is everything, i agree.
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Old 05-07-2014, 09:57 PM   #80
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http://longisland.craigslist.org/cto/4449855798.html

OKAY GUYS, I am still here, and I think I've found her. I'm going to look her over tomorrow, any pointers?
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