User Tag List

+ Reply to Thread
Results 1 to 14 of 14

Thread: Atlas Final Drive for under 6kRPM V8?

  1. #1
    Spanner Monkey

    Join Date
    Apr 2013
    Location
    About
    Age
    39
    Posts
    257
    Thanks
    12
    Thanked 7 Times in 7 Posts

    Atlas Final Drive for under 6kRPM V8?

    My Project has come to the stage where I'm starting to work out Gear Ratios.

    I want to Trackday, Sprint & Hillclimb the car as well as some road work on a summers day..

    hoping for around 950kgs. 350hp/ 350lbft. 13" wheels, 235/45/13 tyres.

    I bought a 4.1:1 but its going to be way to low.

    I have also a 3.75 & 3.44 here.. 3.75 seems like the sweetspot?

    Does anyone run a 3.44 in a V8 with similar power? how does it perform?

    What is the usual ratios for V8 - low reving, high torque conversions?

  2. #2
    Pole Position Decade Plus User freddy686868's Avatar

    Join Date
    Jul 2010
    Location
    South Wales
    Age
    34
    Posts
    4,689
    Thanks
    221
    Thanked 245 Times in 226 Posts

    Re: Atlas Final Drive for under 6kRPM V8?

    Quote Originally Posted by Benzo View Post
    My Project has come to the stage where I'm starting to work out Gear Ratios.

    I want to Trackday, Sprint & Hillclimb the car as well as some road work on a summers day..

    hoping for around 950kgs. 350hp/ 350lbft. 13" wheels, 235/45/13 tyres.

    I bought a 4.1:1 but its going to be way to low.

    I have also a 3.75 & 3.44 here.. 3.75 seems like the sweetspot?

    Does anyone run a 3.44 in a V8 with similar power? how does it perform?

    What is the usual ratios for V8 - low reving, high torque conversions?
    a 3.75 is mint on mine and i only have 220bhp i think 3.44 would be better suited for you, haven't we been through this before? Or was it someone else?

    Are you selling the 4.1?

  3. #3
    Spanner Monkey

    Join Date
    Apr 2013
    Location
    About
    Age
    39
    Posts
    257
    Thanks
    12
    Thanked 7 Times in 7 Posts

    Atlas Final Drive for under 6kRPM V8?

    What engine are you running freddy? Something fairly low reving?

    What do you use it for?

    Must have been someone else, I haven't posted much on here other than sales/wants.

  4. #4
    Spanner Monkey

    Join Date
    Apr 2013
    Location
    About
    Age
    39
    Posts
    257
    Thanks
    12
    Thanked 7 Times in 7 Posts

    Atlas Final Drive for under 6kRPM V8?

    Yes it looks like the 4.1 will be forsale.

  5. #5
    Pit Crew Decade Plus User MegatronUK's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jun 2006
    Location
    Durham, UK
    Age
    45
    Posts
    1,494
    Thanks
    55
    Thanked 100 Times in 95 Posts

    Re: Atlas Final Drive for under 6kRPM V8?

    I'm using 3.7 and 15" wheels for a decent cruising speed/rpms (Cossie, so probably similar power/torque), but I would also say the 3.44 would likely be more suitable if you're sticking with 13" wheels.

    With your proposed tyre sizes and assuming a T5 box, here's the difference between the two ratios:

    Click image for larger version Name:	Screenshot from 2015-07-09 19:32:13.jpg Views:	79 Size:	74.4 KB ID:	75561

    Click image for larger version Name:	Screenshot from 2015-07-09 19:31:05.jpg Views:	79 Size:	75.4 KB ID:	75562

  6. #6
    Spanner Monkey

    Join Date
    Apr 2013
    Location
    About
    Age
    39
    Posts
    257
    Thanks
    12
    Thanked 7 Times in 7 Posts

    Atlas Final Drive for under 6kRPM V8?

    That's a great little system, the iPhone app I have is pretty poor, where did you get this system?

    My top / 6th is 0.86 so alittle lower than the T5.

    Yes sticking to the 13's as I've 2/3sets here and the car is a TR7 V8 Rally rep with a modern V8. 15's would spoil the look.
    Last edited by Benzo; 09-07-2015 at 19:40.

  7. #7
    Pit Crew Decade Plus User MegatronUK's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jun 2006
    Location
    Durham, UK
    Age
    45
    Posts
    1,494
    Thanks
    55
    Thanked 100 Times in 95 Posts

    Re: Atlas Final Drive for under 6kRPM V8?

    You can download a copy here: http://locost7.info/gearcalc.php

    It doesn't need to be installed, just unzip the file and run it - it can also save the output to a text file, so you can play around with different parameters: rpm, tyre size, ratios etc, and then save the results to compare them.

    One of the nicer gear ratio utilities I've found. Good set of box types too (though it doesn't have all of the older Ford box variations).

  8. #8
    Spanner Monkey

    Join Date
    Apr 2013
    Location
    About
    Age
    39
    Posts
    257
    Thanks
    12
    Thanked 7 Times in 7 Posts

    Atlas Final Drive for under 6kRPM V8?

    Quote Originally Posted by MegatronUK View Post
    You can download a copy here: http://locost7.info/gearcalc.php

    It doesn't need to be installed, just unzip the file and run it - it can also save the output to a text file, so you can play around with different parameters: rpm, tyre size, ratios etc, and then save the results to compare them.

    One of the nicer gear ratio utilities I've found. Good set of box types too (though it doesn't have all of the older Ford box variations).
    Thanks must have a look to see if it runs on Mac.

  9. #9
    Pit Crew Decade Plus User MegatronUK's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jun 2006
    Location
    Durham, UK
    Age
    45
    Posts
    1,494
    Thanks
    55
    Thanked 100 Times in 95 Posts

    Re: Atlas Final Drive for under 6kRPM V8?

    Here's your results for your 0.86:1 final drive:

    Click image for larger version Name:	Screenshot from 2015-07-09 19:44:07.jpg Views:	80 Size:	75.1 KB ID:	75566

    Click image for larger version Name:	Screenshot from 2015-07-09 19:44:31.jpg Views:	80 Size:	73.2 KB ID:	75568

  10. #10
    Pit Crew Decade Plus User MegatronUK's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jun 2006
    Location
    Durham, UK
    Age
    45
    Posts
    1,494
    Thanks
    55
    Thanked 100 Times in 95 Posts

    Re: Atlas Final Drive for under 6kRPM V8?

    Quote Originally Posted by Benzo View Post
    Thanks must have a look to see if it runs on Mac.
    It's a Windows utility; I don't think it will, without a whole load of issues unfortunately.

  11. #11
    Pole Position Decade Plus User freddy686868's Avatar

    Join Date
    Jul 2010
    Location
    South Wales
    Age
    34
    Posts
    4,689
    Thanks
    221
    Thanked 245 Times in 226 Posts

    Re: Atlas Final Drive for under 6kRPM V8?

    Quote Originally Posted by Benzo View Post
    What engine are you running freddy? Something fairly low reving?

    What do you use it for?

    Must have been someone else, I haven't posted much on here other than sales/wants.
    Mine is now reving untill 7800rpm. I think that will be the highest i will be reving her. It is a mk5 rs2000 engine but it is 2356cc now. I still have another 30bhp to find as i need to get her back on the rollers and advance the ignition some more.

    I use it for autotests, hill climbs and track days at the moment but i will be going inot rallying that's why i am looking into a 4.1

    I am running a tran x type 9 too so it does 60mph in 1st so it is long enough as it is.

  12. #12
    Spanner Monkey

    Join Date
    Apr 2013
    Location
    About
    Age
    39
    Posts
    257
    Thanks
    12
    Thanked 7 Times in 7 Posts

    Atlas Final Drive for under 6kRPM V8?

    Quote Originally Posted by freddy686868 View Post

    I use it for autotests, hill climbs and track days at the moment but i will be going inot rallying that's why i am looking into a 4.1

    I am running a tran x type 9 too so it does 60mph in 1st so it is long enough as it is.
    I've advertised mine in the forsale section now if you are interested!

  13. #13
    Pole Position Decade Plus User freddy686868's Avatar

    Join Date
    Jul 2010
    Location
    South Wales
    Age
    34
    Posts
    4,689
    Thanks
    221
    Thanked 245 Times in 226 Posts

    Re: Atlas Final Drive for under 6kRPM V8?

    Quote Originally Posted by Benzo View Post
    I've advertised mine in the forsale section now if you are interested!
    Let me know when you have photos i might be interested.

  14. #14
    Spanner Monkey

    Join Date
    Apr 2013
    Location
    About
    Age
    39
    Posts
    257
    Thanks
    12
    Thanked 7 Times in 7 Posts

    Atlas Final Drive for under 6kRPM V8?

    Quote Originally Posted by freddy686868 View Post
    Let me know when you have photos i might be interested.
    I will do, I'll in the workshop tomorrow and will post more details!

+ Reply to Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts