Magunum Swap, need guidance

[JrFish]

...and plenty of it. So if any of you O.G. S197 experts around are up to babysitting this thread and project, TIA!

I've got to get my parts list figured out, knock over a bank or 3, and order this trans, and get moving again soon. Can I get some opinions and reasoning to ponder?

Facts
-2014 GT with essentially a stock powertrain. Nothing beyond CIA and cat-back exhaust in terms of power adders.
-Plan on running the powerplant like this as long as she will let me and hold up. At which point, a more built motor will go in. Hence the headroom of the Magnum swap.
-Rear appears to be a 3.55. Will regear if necessary to try and replicate the stock final drive ratios which have been really nice for this amount of power.
-Purpose is to build a bullet-proof HPDE car. I am chasing driving experiences, easy weekends, and not lap time. ...at least not yet.
-I still street it some, but my intent to move the build away from that. Streetability not really a priority.
-Intent is to share the seat with my oldest kid. He's a novice. He needs work (especially considering he accelerated the demise of the MT-82 in about 4 laps of COTA).
...so, a clutch that is forgiving of his fumbles and shelters the driveline some from shock loads is a goal.

High level questions
1. Ratios? Close ratio 2.66 -> .63? This makes MT-82 2-5 about = to 1-4 Tremec? There's only the 2 ratio packages to choose from right?

2. Clutch, here's where I'm befuddled. Too many choices.
I'll save you all my ideas of pros and cons, but again, saving the trans from poorly rev-matched shifts at the expense of clutch longevity is fine. Clutches are consumables after all.
My drag racing/ovelry-engineering build buddy is adamant we should put an adjustable clutch in it so we can tinker with and set base plate pressures as needed to preserve the driveline.

3. Flywheel? Should I really bother with putting a lighter flywheel on it? Would I feel it? Would it heat damage quicker and start chattering? ..I mean yes, but how soon/how much huh?

That's where I'm at. If I can come to a conclusion on these broad questions I can start making the grocery list.
Appreciate everyone's help, past, present, and future.

 

[stevbd]

If your clutch is fried, my vote would be a stock flywheel, very slightly heavier duty clutch, and use the MT82. Put the $5k you save towards wheels and tires.

Honestly, your post reads a little bit like a solution in search of a problem. The MT82 is more than capable of holding up well to a stock power train, stock redline, hpde style 20-30 minute sessions, and no w2w racing. The big variables are the clutch and the driver, both of which it appears you are working on. The ratios in an original MT82 are great, arguably better than the magnum (closer ratio). I probably wouldn’t do an aluminum flywheel or fancy clutch with a new manual shift student like your son. (Very cool he is learning stick btw. )

 

[JrFish]

Clutch is ok. MT-82 is toast, something internal has the shifter locked up. Haven't cracked it open yet, but presuming we destroyed #3 synchro. Hoping to get it on a bench this week and open it to see what went wrong. Appreciate your inputs. Just don't wanna go down the MT-82 rebuild path.

 

[Champale]

Have you considered a GT350 TR3160? There are some people on this forum who have installed them with their Coyotes. As someone who owned 2 different MT82 cars (Bosses) and now has a TR3160 GT350R, there is simply no comparison in terms of feel and apparently they are much more robust. I have not looked at a gearing chart in a while so I can't comment on speed-in-gears but I feel like the ratios weren't a million miles apart from Boss MT82 to GT350 3160.

 

[EF1]

...and plenty of it. So if any of you O.G. S197 experts around are up to babysitting this thread and project, TIA!

I've got to get my parts list figured out, knock over a bank or 3, and order this trans, and get moving again soon. Can I get some opinions and reasoning to ponder?

Facts
-2014 GT with essentially a stock powertrain. Nothing beyond CIA and cat-back exhaust in terms of power adders.
-Plan on running the powerplant like this as long as she will let me and hold up. At which point, a more built motor will go in. Hence the headroom of the Magnum swap.
-Rear appears to be a 3.55. Will regear if necessary to try and replicate the stock final drive ratios which have been really nice for this amount of power.
-Purpose is to build a bullet-proof HPDE car. I am chasing driving experiences, easy weekends, and not lap time. ...at least not yet.
-I still street it some, but my intent to move the build away from that. Streetability not really a priority.
-Intent is to share the seat with my oldest kid. He's a novice. He needs work (especially considering he accelerated the demise of the MT-82 in about 4 laps of COTA).
...so, a clutch that is forgiving of his fumbles and shelters the driveline some from shock loads is a goal.

High level questions
1. Ratios? Close ratio 2.66 -> .63? This makes MT-82 2-5 about = to 1-4 Tremec? There's only the 2 ratio packages to choose from right?

2. Clutch, here's where I'm befuddled. Too many choices.
I'll save you all my ideas of pros and cons, but again, saving the trans from poorly rev-matched shifts at the expense of clutch longevity is fine. Clutches are consumables after all.
My drag racing/ovelry-engineering build buddy is adamant we should put an adjustable clutch in it so we can tinker with and set base plate pressures as needed to preserve the driveline.

3. Flywheel? Should I really bother with putting a lighter flywheel on it? Would I feel it? Would it heat damage quicker and start chattering? ..I mean yes, but how soon/how much huh?

That's where I'm at. If I can come to a conclusion on these broad questions I can start making the grocery list.
Appreciate everyone's help, past, present, and future.

I swapped a Magnum XL into my 2011 GT a few years ago. I have the close ratio road race version with the 2.66 first gear. Gears 1-4 in the Tremec are very close to the 2-5 in the MT82. I swapped the 3.55 rear gears for a set of 4.10's after a few track weekends. The hard 2-3 shift that replaced the familiar 3-4 in the MT82 was annoying. I have a gear ratio calculator I set up in Excel to compare changes at rpm between the 2 trans that helped me decide which gears to swap to. If you want the sheet pm me.

Clutches are all different and what one person likes the next does not. If you want something that is forgiving for a newer driver stick with organic discs. The clutch really dictates the flywheel. Not all play well together I would get the flywheel and clutch from the same manufacturer to make sure they are compatible.

Good luck on the swap. I do not think you will regret the Tremec swap.