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Old 05-25-2014, 07:14 AM   #1
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Drag tires, axle and drive shaft

I have a 2014 GT premium with track package. I have upgraded it with kook's 1 3/4' lt headers, off road h pipe and stingers on the catback. I replaced the rear control arms with after market bolt ons, i dont want to lower the car because the roads are terrible here.

So im gearing up for some track time and i haven't a clue what kind of drag tires i should get. dont know what size, brand, really anthing about them. my current tires (from factory) are 255/40 19 inch Pirelli. Any suggestion on the size tire, brand etc?

My next question, will the stock driveshaft and Torsen helical differential that comes with the track pack be able to handle the force? Does anyone know the spline on that axle? i cant seem to find it anywhere.

At what HP does one need to upgrade the axle and drive shaft and are there any other upgrades that need to go with a power boost (say a supercharger)to prevent damage

Thank you in advance!
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Old 05-25-2014, 08:09 AM   #2
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The Torsen differential will not hold up long at the track especially with a drag radial because it is not built for high rpm clutch dumps. You are playing Russian Roulette with it.

All rears from 2005+ have 31 spline axles.
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Old 05-25-2014, 03:41 PM   #3
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Thank you. do they sell drag differentials that can be swapped out with the Torsen? or do i have to get an entire new axle assembly?
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Old 05-25-2014, 03:55 PM   #4
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crev,

I purchased Nitto 555R in 275/60/15s. I am pleased with the traction I get as there is no comparison with the stock PZero tires. I just use these tires for drag racing at the track My set up is BOSS 302 Intake Manifold, JLT CAI, J&M LCAs, 3.73 Ford Racing gears, BAMA 93 Race Tune in my 2012 GT Auto.
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Old 05-25-2014, 03:59 PM   #5
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The Torsen in the track pack is not the full road course only unit they sell, it's the slightly less aggressive unit and should take occasional 1/4 mile duty, particularly if you run a proper bias slick, which softens the hit on the whole driveline. No radials with a manual trans in this car.

I bet if you pulled that Torsen and said, "Hey, I'll trade you straight up for a carbon plate standard Trak Lok." You'd get 100 responses in minutes. The Diff can be easily removed without touching the rear gear in an 8.8.
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Old 05-25-2014, 04:10 PM   #6
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Quote:
Originally Posted by Paladin6591 View Post
crev,

I purchased Nitto 555R in 275/60/15s. I am pleased with the traction I get as there is no comparison with the stock PZero tires. I just use these tires for drag racing at the track My set up is BOSS 302 Intake Manifold, JLT CAI, J&M LCAs, 3.73 Ford Racing gears, BAMA 93 Race Tune in my 2012 GT Auto.
You have an auto and can run a drag radial. He has a manual and needs to run a slick.
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Old 05-25-2014, 06:46 PM   #7
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The Torsen in the track pack is not the full road course only unit they sell, it's the slightly less aggressive unit and should take occasional 1/4 mile duty, particularly if you run a proper bias slick, which softens the hit on the whole driveline. No radials with a manual trans in this car.

I bet if you pulled that Torsen and said, "Hey, I'll trade you straight up for a carbon plate standard Trak Lok." You'd get 100 responses in minutes. The Diff can be easily removed without touching the rear gear in an 8.8.
So would you say the Torsen would be able to handle the force if i were to upgrade to an aftermarket 31 spline axle? What kind of slick do you recommend (not sure what bias means) . right now i have about 470 HP from the fly wheel. i eventually want to upgrade to a Kenne Bell supercharger, with my end ultimate HP goal somewhere around 800 off the fly wheel.
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Old 05-25-2014, 06:55 PM   #8
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Your car came with 31 spline axles. But that's not what will break. The Torsen will.

I never understand why guys get the track pack and then want to drag race their cars.
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Old 05-25-2014, 07:32 PM   #9
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Your car came with 31 spline axles. But that's not what will break. The Torsen will.

I never understand why guys get the track pack and then want to drag race their cars.
because the GT Track Pack includes: TORSEN® helical differential with 3.73:1 axle ratio • Upgraded Boss® 302 radiator • High-performance Brembo ™ friction material upgrade (unique corner modules) • Upgraded front and rear brakes (with unique caliper finish) and booster • Unique front corner modules • 19 x9.0 premium painted (dark stainless) aluminum wheels and 255/40R19 Z-rated summer-only tire • Tire mobility kit (HJBAB) • Unique ESC module tuning. I did not know the torsen would be a problem, i guess i should clarify i might get to the drag track 4 or 5 times a year
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Old 05-25-2014, 08:55 PM   #10
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So base 5.0 are better for drag races?

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Old 05-25-2014, 09:00 PM   #11
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That's why I have always said.
Base model is the hot rod version. Only thing you need to do is weld the axle tubes and your set

Premium is luxury that's it.

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Old 05-25-2014, 09:03 PM   #12
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That's why I have always said.
Base model is the hot rod version. Only thing you need to do is weld the axle tubes and your set

Premium is luxury that's it.

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I've seen project coyote from american muscle and in both of there project cars they upgraded the drive shaft ($800ish)
Will these be better than the one that the track pack includes?
Insn't Torsen the one GT500 brings?

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Old 05-25-2014, 10:02 PM   #13
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I just put a set of 28X12.5X15 M/T ET Streets on my '13 Track Pack yesterday. I know that these tires hook extremely well from past experience. However, I will induce a little spin before I risk blowing the Torsen in my car. FYI, I have also upgraded the driveshaft, upper and lower control arms, welded the axle tubes, added a Swarr Bar and Strano adj. rear sway bar.
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Old 05-25-2014, 10:16 PM   #14
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[QUOTE=Hulk 5.0;2017782]I've seen project coyote from american muscle and in both of there project cars they upgraded the drive shaft ($800ish)
Will these be better than the one that the track pack includes?
Insn't Torsen the one GT500 brings?

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Yes they will. I have a DSS driveshaft which is rated to handle 1000 hp. I believe most aftermarket driveshafts are capable of handling twice the stock hp.
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Old 05-25-2014, 11:31 PM   #15
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Is there a topic on this welding of the axle tubes? Never heard of it being done... would like to learn more about it

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Old 05-26-2014, 03:22 AM   #16
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Is there a topic on this welding of the axle tubes? Never heard of it being done... would like to learn more about it

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You want to have the tubes welded to the pumpkin to prevent them from twisting. I had mine done when I had the Swarr Bar welded on. Eric Swarr instructed me to have the Swarr Bar welded on first, so that the tubes would remain square when welding them. They can be arc, mig or tig welded. Here is a pic of mine after welding and painting.
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Old 05-26-2014, 06:42 AM   #17
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I just put a set of 28X12.5X15 M/T ET Streets on my '13 Track Pack yesterday. I know that these tires hook extremely well from past experience. However, I will induce a little spin before I risk blowing the Torsen in my car. FYI, I have also upgraded the driveshaft, upper and lower control arms, welded the axle tubes, added a Swarr Bar and Strano adj. rear sway bar.
Thanks for the advice, i take it your not expecting to much of an issue with the Torsen then? How often do you take yours to drag? Also if you dont mind telling me, do you have any HP boosters (supercharger, nitro, etc)
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Old 05-26-2014, 08:50 AM   #18
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Just FYI...Just go to the track a few times in the season. (Do it just for kicks and grins and have a blast) I'm a newbie to drag racing and do have much to learn....still. Have been 4 times this year - 2 times 1/8th and 2 times 1/4 mile track. So far no issues with torsen nor any suspension problems. Of course I am under 500 HP (flywheel). I do not run nitrous and do not have a SC. Only additions to what I already have will be a Circle D 2c torque converter and exhaust system with headers. I am at 12.0 in quarter mile with my current setup at about 480 HP.
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Old 05-26-2014, 09:02 AM   #19
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Thanks for the advice, i take it your not expecting to much of an issue with the Torsen then? How often do you take yours to drag? Also if you dont mind telling me, do you have any HP boosters (supercharger, nitro, etc)
Not expecting any problems with the Torsen. I haven't made any hits at the drag strip yet. I have spent the last 2 years buying and installing parts to set the car up for street/strip duty. As far as power adders, I have an Airaid CAI, Poweraid throttle body spacer (needed for custom nitrous system), full Bassani exhaust, Nitrous Outlet nitrous kit with a Nano system, MSD 2Step and progressive controller.

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Old 05-26-2014, 09:07 AM   #20
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Throttle body spacer for what, kind of custom system? Its a single nozzle correct?

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Old 05-26-2014, 09:25 AM   #21
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Throttle body spacer for what, kind of custom system? Its a single nozzle correct?

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Nitrous Outlet system with all custom length lines and their solenoid bracket. I needed the throttle body spacer, so that the solenoid bracket would clear the Y adapter in the cooling system. Had I known that before hand I would have just bought their plate kit. I also had to make other modifications to install the single nozzle, such as clearance the cooling fan shroud and cutting and installing new hose from the driver's side valve cover to the valve behind the TB, as the stock line was resting on the solenoid. Needless to say, I took a different approach with my install, but I am very happy with the end result.
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Old 05-26-2014, 09:38 AM   #22
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Hmmm biggest mistake I did was my first nitrous setup on my coyote. Single nozzles are junk. They honestly are. Upgrade to the plate kit and your motor will thank you. I ran a single nozzle for a little bit, till I wised up.

My old setup


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Old 05-26-2014, 09:41 AM   #23
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Rapinator126, what is your 1/4 ET?
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Old 05-26-2014, 09:44 AM   #24
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Rapinator126, what is your 1/4 ET?
200.

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---------- Post added at 09:44 AM ---------- Previous post was at 09:43 AM ----------

Lil car is a street/ roll car

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---------- Post added at 09:44 AM ---------- Previous post was at 09:44 AM ----------

*lol

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Old 05-26-2014, 09:46 AM   #25
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A couple of dig runs though. ( twisted axles leaving on a 200) Actual 1/4 never been with this car.

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Old 05-26-2014, 09:52 AM   #26
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Hmmm biggest mistake I did was my first nitrous setup on my coyote. Single nozzles are junk. They honestly are. Upgrade to the plate kit and your motor will thank you. I ran a single nozzle for a little bit, till I wised up.

My old setup


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I wouldn't go so far as to call the nozzle systems junk, but rather old-hat technology. The plate kit is without a doubt the more current technology of the two. If I were seriously competing with my car I would bypass both of those systems and go with a direct port. This setup netted me 519 rwhp and 551 rwtq on a 100 shot, which should be enough to run 10's (I hope). 'What did you dislike about your nozzle kit and what kind of power did you make with it?
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Old 05-26-2014, 10:00 AM   #27
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Made 611hp and on a 200. With the single nozzle. The distribution sucks on a single nozzle.

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---------- Post added at 10:00 AM ---------- Previous post was at 09:59 AM ----------

Sold that kit and everything with it for $900 and called it a day on that setup

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Old 05-26-2014, 10:07 AM   #28
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Just buy there plate itself and run your lines to it. And plug the hole in your CAI.

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Old 05-26-2014, 10:12 AM   #29
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That was also back when it was stock motor and 93 pump gas.

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Old 05-27-2014, 05:18 PM   #30
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this has been most informative, thank you all.

Still not sure on the drive shaft, anyone know what the stock drive shaft is good up too?
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Old 05-28-2014, 04:34 PM   #31
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Just buy there plate itself and run your lines to it. And plug the hole in your CAI.

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Yeah, I've thought about that, but at this point I'm really not trying to spend another dime on the nitrous setup. I've already spent more than I intended to on the nitrous setup. Then of course I always end up exceeding my budget for performance parts.
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Old 05-28-2014, 04:41 PM   #32
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Yeah, I've thought about that, but at this point I'm really not trying to spend another dime on the nitrous setup. I've already spent more than I intended to on the nitrous setup. Then of course I always end up exceeding my budget for performance parts.
Dont we all?? Lol

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