4.10's, a4, and mpg
4.10's, a4, and mpg A friend of mine has an m6 and 4.30's, and can get like 400 miles a tank by driving in a very high gear, well auto's don't really have that luxary, so I was wondering how much of a difference 4.10's make? I usualy stay around the speed limit in the city, and 80 on the highway, if that helps.
If you do that much city driving and go 80 on the highway, for the love of God don't get 4.10s! Do you know how many RPMs you'd be turning at 80 mph?! And they pull like a raped ape, but aren't worth the increased revs and gas loss. Go for the 3.73s.
Originally Posted by Scotty-Z
If you do that much city driving and go 80 on the highway, for the love of God don't get 4.10s! Do you know how many RPMs you'd be turning at 80 mph?! And they pull like a raped ape, but aren't worth the increased revs and gas loss. Go for the 3.73s.
ya bro.. I agree with scotty, 373s are the way to go.
with 410s you will be looking at 4000+ rpm at 80 mph
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Originally Posted by LC1
i'm wondering the same thing. But some one said that with 4.10s car will shift to 4th at the track
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11 Second Club
Joined: Feb 2003
Posts: 5,524
Likes: 1
From: The South
Don't put 4.10's in an auto if it's a street car. IMO there is just no need for that. That's why they make high stall converters. Gears, either 3.23-3.42-3.73 and a high stall converter, say 4,000, will pull pretty well. 
damn it. i guess i better take mine out then. with higher gears, you need less converter. less stall, means less heat buildup. trade off, don't see any between the two. high stall, less gear will keep rpms up just like lower stall, hihger gears do. i just see less heat build up in the trans.
11 Second Club
Joined: Feb 2003
Posts: 5,524
Likes: 1
From: The South
Originally Posted by mrr23
damn it. i guess i better take mine out then. with higher gears, you need less converter. less stall, means less heat buildup. trade off, don't see any between the two. high stall, less gear will keep rpms up just like lower stall, hihger gears do. i just see less heat build up in the trans.
I doubt there is much of a heat difference between a 3500 and 4k stall converter, and with a good trans cooler heat buildup isn't much to worry about regardless.
You have 4.10's in the heads/cam car that runs 11.67? Is that the one you are referring to?
well, i do agree with the interstate deal.
no, i have 4.10 in the 00 formula that runs 11.664 @ 117.67. all stock motor from TB to CATS. pulls a disappointing 1.709 60ft. yeah, i liked the 2300 rpms @ 90 mph better than 3000 rpms @ 80 mph. but, my car is more strip action. hers is more street action.
slp airlid
k/n filter
200 n2o motor rating
yank py3400e
4.10 gears
315/35-17 nitto DRs
the wife's car has stock cam just to let you know. her's still has the stock converter and 3.23 gears as well.
no, i have 4.10 in the 00 formula that runs 11.664 @ 117.67. all stock motor from TB to CATS. pulls a disappointing 1.709 60ft. yeah, i liked the 2300 rpms @ 90 mph better than 3000 rpms @ 80 mph. but, my car is more strip action. hers is more street action.
slp airlid
k/n filter
200 n2o motor rating
yank py3400e
4.10 gears
315/35-17 nitto DRs
the wife's car has stock cam just to let you know. her's still has the stock converter and 3.23 gears as well.
11 Second Club
Joined: Feb 2003
Posts: 5,524
Likes: 1
From: The South
I'd bet the majority of mpg loss is on the highway/interstate. Some nice time for the mods on that one. 
You may not find somebody with 4.10's in an A4 that has a before/after mpg on the interstate. Most street cars/daily drivers go with bigger stall and more mild gears. Only time will tell.......
You may not find somebody with 4.10's in an A4 that has a before/after mpg on the interstate. Most street cars/daily drivers go with bigger stall and more mild gears. Only time will tell.......
thanks for the compliment. one of the few that actually see that mid 11s on stock motor and fuel system is pretty good. and that time was done in june about 1:00pm in the after noon.
Staging Lane
Joined: Nov 2001
Posts: 77
Likes: 0
From: Phoenix Arizona
TECH Fanatic
Joined: Jul 2005
Posts: 1,243
Likes: 0
From: Dallas
Originally Posted by Got Me SOM
a 3.23 or 3.42 should be plenty, match that up with at least a 3500 stall and you'll be good to go.
I'm staying with my 2.73s until a 12 bolt becomes affordable. Aslo easier on the 10 bolt.What may help the 4.10+ A4 delimma, is a little thing called Gear Vendors that I first saw featured on Trucks (copperhead has one)
http://www.gearvendors.com/hrgm4s.html
This thing gives you 8 forward gear ratios, including an overdrive for your overdrive
As you can see, the end gear ratio of 4/OD OD on 4.10 gears is 2.24, slightly BELOW the normal 4th/OD with 3.23s @ 2.26. That'll give you back your gas mileage.Only downside, $2k+
