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  1. #1
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    Going with 3 91 gears on the 9 liter

    My 2013 is at Prefix now getting new pistons, Jesel rockers and solid cam and a new 7200RPM redline.
    With the new higher redline, I can run 3.91's and still have slightly higher shift points, the best of both worlds.

    (Stock shiftpoints) 3.55's, 27.4" tires, 6400rpm redline 1st 65mph, 2nd 93mph, 3rd 123mph, 4th 147mph, 5th 191mph
    (New shiftpoints) 3.91's 28" tires 7200rpm redline 1st 68mph, 2nd 97mph, 3rd 129mph, 4th 153mph, 5th 199mph

    So not including the extra power the motor will make, I'll be putting 10.14% more torque to the wheels from idle to redline and will have to shift less often.
    This, combined with the extra 50-60hp/tq this is going to drastically help my lap times
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  2. #2
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    My experience is that that's too much gear for a built Gen 5. It seems to not give the motor enough time to pull the gear and traction is limited.
    Are you gonna run an OS Giken or Wavetrac LSD?

    Just my 2 cents, your opinion may differ.
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  3. #3
    Enthusiast stradman's Avatar
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    Quote Originally Posted by Dan Cragin View Post
    My experience is that that's too much gear for a built Gen 5. It seems to not give the motor enough time to pull the gear and traction is limited.
    Are you gonna run an OS Giken or Wavetrac LSD?

    Just my 2 cents, your opinion may differ.
    Yeah I got a Wavetrac on my 9.0 and initial impressions are defo positive

  4. #4
    Enthusiast Redx's Avatar
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    whats the difference with this new cam?

  5. #5
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    Quote Originally Posted by Dan Cragin View Post
    My experience is that that's too much gear for a built Gen 5. It seems to not give the motor enough time to pull the gear and traction is limited.
    Are you gonna run an OS Giken or Wavetrac LSD?

    Just my 2 cents, your opinion may differ.
    With 7200RPM and taller tire I think it's gonna work. Plus I run Michelin slicks, right now with 730whp I can floor the throttle in 2nd gear and put 100% of the power down.
    I'm going with the stock diff, what would be the advantages to the other two you mentioned? (OS Giken or Wavetrac LSD)
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  6. #6
    Supporting Vendor JonB ~ PartsRack's Avatar
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    3:91 sure sounds like a TYPO to me................You've been seeing #39 on the car so long you brain-melded it?

    I would be thinking 3:19, not 3:91 ! I agree w/ Dan Cragin 100%.

    NOTE: 3:21 avail, stronger carrier bolts and a HD 24-spline yoke. Beefy.
    Last edited by JonB ~ PartsRack; 05-01-2019 at 04:38 PM.
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  7. #7
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    I think it sounds like one hell of a ride! Do it.

  8. #8
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    Quote Originally Posted by JonB ~ PartsRack View Post
    3:91 sure sounds like a TYPO to me................You've been seeing #39 on the car so long you brain-melded it?

    I would be thinking 3:19, not 3:91 ! I agree w/ Dan Cragin 100%.

    NOTE: 3:21 avail, stronger carrier bolts and a HD 24-spline yoke. Beefy.
    Did you read my whole post? I'm running 28" tall tires, redlining at 7200 RPM and running a big solid cam.

    Here's what your suggested 3.21's would do with my setup lol-
    1st gear 87mph
    2nd gear 119mph
    3rd gear 157mph
    4th gear 187mph
    5th gear 243mph

    As I stated, my car currently puts down 100% throttle all thru 2nd gear, why would I want less power to the wheels? I've researched this for my car, for my needs on the tracks I run and 3.91's will be best. The car will still put down 100% throttle in 2nd ( I never use 1st gear road racing) and my shift speeds are STILL higher than stock.
    Last edited by Arizona Vipers; 05-01-2019 at 05:27 PM.
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  9. #9
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    Quote Originally Posted by Arizona Vipers View Post
    Did you read my whole post? I'm running 28" tall tires, redlining at 7200 RPM and running a big solid cam.

    Here's what 3.21's would do with my setup lol-
    1st gear 87mph
    2nd gear 119mph
    3rd gear 157mph
    4th gear 187mph
    5th gear 243mph

    As I stated, my car currently puts down 100% throttle all thru 2nd gear, why would I want less power to the wheels? I've researched this for my car, for my needs on the tracks I run and 3.91's will be best. The car will still put down 100% throttle in 2nd ( I never use 1st gear road racing) and my shift speeds are STILL higher than stock.
    As long as you can still put the power to the ground it will damn sure help with the drag races with GT2s/GT3s on the short straights at the tracks you run! With the 3:21s you would mostly be a 3rd gear car. I went with 3:73s - guess we'll see how it works out.

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  10. #10
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    Quote Originally Posted by Arizona Vipers View Post
    what would be the advantages to the other two you mentioned? (OS Giken or Wavetrac LSD)
    While the link doesn't answer your question, does provide VE's perspective into the stock diff.
    https://www.youtube.com/watch?v=LRXVRjDu9aY

  11. #11
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    Quote Originally Posted by Pappy View Post
    As long as you can still put the power to the ground it will damn sure help with the drag races with GT2s/GT3s on the short straights at the tracks you run! With the 3:21s you would mostly be a 3rd gear car. I went with 3:73s - guess we'll see how it works out.

    Pappy
    Yeah it should still put the power down. I can even put the power down now in the top half of 1st with the slicks, but I never use 1st. Right now with the stock gears GT3's beat me up to about 70 and that's with the 9 liter. You've seen it first hand with Jason's I'm sure. The 28" tires made a huge difference in my gearing.
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  12. #12
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    Quote Originally Posted by Pappy View Post
    As long as you can still put the power to the ground it will damn sure help with the drag races with GT2s/GT3s on the short straights at the tracks you run! With the 3:21s you would mostly be a 3rd gear car. I went with 3:73s - guess we'll see how it works out.

    Pappy
    Your 3.73's with your much shorter tire- 26.8" are going to be effectively almost identical to my 3.91 with 28". Not sure what gears are in your tranny though. Your motor is going to be a monster revver so that's good.
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  13. #13
    Enthusiast Jack B's Avatar
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    Quote Originally Posted by Arizona Vipers View Post
    Your 3.73's with your much shorter tire- 26.8" are going to be effectively almost identical to my 3.91 with 28". Not sure what gears are in your tranny though. Your motor is going to be a monster revver so that's good.
    Do the 28" tires fit without rubbing or did you modify the wheel wells. Just an opinion, but, it looks perfect. As far as the traction, with slicks on, my 9L grips well except in first, but, i have the 2.66 1st gear. Even the toyo's grip well in 2nd when the road surface is warmed up
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  14. #14
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    Quote Originally Posted by Jack B View Post
    Do the 28" tires fit without rubbing or did you modify the wheel wells. Just an opinion, but, it looks perfect. As far as the traction, with slicks on, my 9L grips well except in first, but, i have the 2.66 1st gear. Even the toyo's grip well in 2nd when the road surface is warmed up
    No mods needed for street use, but my car is very low and on tracks with big elevation changes I have hit my drivers side back body panel and pushed it out a bit. Another guy on here running the same tire did the same thing, I cant remember who. Agreed, this car can put the power down very well with slicks on it, especially the ACR's with the big wing. I'd say I could put down 1000whp in 2nd gear with no problem.
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  15. #15
    Enthusiast dewilmoth's Avatar
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    Quote Originally Posted by Arizona Vipers View Post
    No mods needed for street use, but my car is very low and on tracks with big elevation changes I have hit my drivers side back body panel and pushed it out a bit. Another guy on here running the same tire did the same thing, I cant remember who. Agreed, this car can put the power down very well with slicks on it, especially the ACR's with the big wing. I'd say I could put down 1000whp in 2nd gear with no problem.
    It’s incredible how much grip these cars have, in the rear especially. I’m very interested in hearing your thoughts of the 3.91s.

    Are you still on the stock crank and rod length at 7200RPM?

  16. #16
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    Saw your car at Prefix yesterday, really looking forward to seeing how the upgrade turns out!
    -2008 Venom Red ACR Hardcore

  17. #17
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    Quote Originally Posted by dewilmoth View Post
    It’s incredible how much grip these cars have, in the rear especially. I’m very interested in hearing your thoughts of the 3.91s.

    Are you still on the stock crank and rod length at 7200RPM?
    It's the Prefix 9 liter crank and rods
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  18. #18
    Enthusiast dewilmoth's Avatar
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    Quote Originally Posted by Arizona Vipers View Post
    It's the Prefix 9 liter crank and rods
    Gotcha, thanks. Was thinking that was only bigger pistons, forgot it includes a crank and rods.

  19. #19
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    Prefix also pointed out there were changes to the oiling system with the 9.0. It's a fantastic package.
    -2008 Venom Red ACR Hardcore

  20. #20
    Quote Originally Posted by str5010 View Post
    Prefix also pointed out there were changes to the oiling system with the 9.0. It's a fantastic package.
    What is the changes in the oiling system ? A dry sump you mean
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  21. #21
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    Quote Originally Posted by GTSilver View Post
    What is the changes in the oiling system ? A dry sump you mean
    No it's still wet sump in the standard package but it sounds as though they have moved from cross drilled to straight shot oiling in the crank.
    -2008 Venom Red ACR Hardcore

  22. #22
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    My car already had a Dailey dry sump setup installed by CalvoMotorsports.com
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually


 

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