Antnicuk
|
| posted on 21/3/10 at 08:11 PM |
|
|
I cant decide! you choose (diff ratio)
Below are the figures for the 3 diffs available for my atlas. (without paying a fortune)
Even though the car has lots of power, it is turbo charged and has a little lag, I currently have the 3.09 in it at the moment and its ok to poodle
about and nice and low reving but on track it is sluggish out of the tighter bends and putting back in first is just pointless. My only concern with
going for something too high is wheel spin, which it does a lot of already. Its mainly a track day toy!
What do you guys think?
3.75
70 mph in 5th is doing 2750 rpm
Gear Mph per 1000 RPM Mph @6500 RPM Mph @7000 RPM
--------------------------------------------------------
1 5.25 34 37
2 9.08 59 64
3 13.16 86 92
4 18.30 119 128
5 25.46 165 178
3.44
70 mph in 5th is doing 2550 rpm
Gear Mph per 1000 RPM Mph @6500 RPM Mph @7000 RPM
--------------------------------------------------------
1 5.73 37 40
2 9.90 64 69
3 14.34 93 100
4 19.95 130 140
5 27.75 180 194
3.09
70 mph in 5th is doing 2250 rpm
Gear Mph per 1000 RPM Mph @6500 RPM Mph @7000 RPM
--------------------------------------------------------
1 6.38 41 45
2 11.02 72 77
3 15.97 104 112
4 22.21 144 155
5 30.89 201 216
[Edited on 21-3-10 by Antnicuk]
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
|
|
|
|
|
YQUSTA
|
| posted on 21/3/10 at 08:22 PM |
|
|
If it were me and is mainly a track toy I would go for the 3.75.
You should never need to goto first and you should eliminate all/most of the lag by keeping the revs that little higher.
All in my opinion not from experiance
"If in doubt flat out"
Colin McRae
|
|
|
tul214
|
| posted on 21/3/10 at 08:34 PM |
|
|
3.75, or if you can find a P100, take the 4.6 ratio.
When I swapped my 3.75 for the 4.1 it made all the difference to the revvy engine. IMHO it allows you to use the power in every gear.
[Edited on 21/3/10 by tul214]
1.6 Raw Super6 sold
|
|
|
skinned knuckles
|
| posted on 21/3/10 at 08:45 PM |
|
|
defo the 3.75 mate. you'll be shifting gear more but it will be worth it in pull away.
A man isn't complete until he's married, then he's finished
|
|
|
Antnicuk
|
| posted on 21/3/10 at 08:49 PM |
|
|
i suppose i could just proper slicks for the back as the 888's spin as it is! 
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
|
|
|
Ivan
|
| posted on 21/3/10 at 08:55 PM |
|
|
Well - in theory your diff should just allow you to pull maximum revs in top gear at the end of the main straight so I would guess at something close
to 4.5:1 and, as that isn't an option, 3.75 is the choice to make.
|
|
|
Xtreme Kermit
|
| posted on 21/3/10 at 10:36 PM |
|
|
go 3.75 for a track day toy.
I'm swapping from a 3.62 to and 3.9 and that's just for a pinto powered car.
Rev and enjoy
|
|
|
