Leafy

iTrader: (1)

Even still, with as many tranny's bundy has gone through he hasnt popped the diff or at least in a while. We break axles when launching the auto-x cars, even at stock power but not enough to consider it a big deal. To add onto that most of the LSx swap people are whine and cheezers I doubt any of them would even pop a normal 1.8 diff and axles never mind the MSM setup with ARP studs on the bearing caps and a crush sleeve eliminator.

And with Tims car I would expect him to blow up the T5s before the diff.

MOABmiata

Sound of 6 cylinder > sound of 4 cylinder.

I like it. May not have weight savings of a K, but tq and sound would be enough to justify the swap to someone who isn't building the car to be competitive.

krissetsfire

iTrader: (1)

With that logic we should see 300hp na k series all over the place. They aren't a dime a dozen for a reason. People turbo them to get that power for a reason. It's not like you can just bolt on an exhaust and get 100hp. They are stock like ~205 at the crank.

I have nothing to say about the J.

v8 sounds > v6 sounds

concealer404

iTrader: (3)

He said "easily," not "cheaply."

TurboTim

iTrader: (9)

What's special about the MSM diff compared to a typical 1.8 diff?

Are not these diffs similar to the S2000 diffs and where yes, you can try aftermarket bearing caps and that crush sleeve eliminator, by that guy that's doing miataroadster's 3.3 diff builds. Puddy Mod Racing I think.

I think Sav broke a diff on Thesus. He had a good write up on his theories behind it's destruction.

I expect my new T5z to outlast the diff just from youtube videos of foxbodies launching at the strip. I expect the trans and the diff to outlast the car. ****, I probably jinxed myself and will break both on my drive home. ~12psi at the moment running my boost control as open loop dummy bleeder single port style. I'm actually stopping by mcmaster on the way home to pick up some T fittings to plumb the EWG for proper 2 port closed loop operation, then i'll see how slowly it still spools.

205/45/16 GForce sports are my drivetrain fuse.

concealer404

iTrader: (3)

MSM diff has more bigger things. Or at least, the axles or something.

Leafy

iTrader: (1)

Its just the axles. But if I was going to run a strong enough tranny to take 350ftlbs all the time, I'd want the MSM axles so they wouldnt snap like every 20 launches.

Ryan_G

iTrader: (8)

The MSM has larger axles and the diff housing is physically larger. I am not sure how much if any additional strength the beefier diff housing adds.

krissetsfire

iTrader: (1)

I guess it depends on your definition of easily but it would take a lot of work to get it to 300. Not just bolting a bunch of stuff on. Reading the thread you'd think that it was no big deal to just slap a 300hp k in.

TurboTim

iTrader: (9)

Ahhh ok that makes sense. IIRC Sav's breakage was more to do with housing stiffness, not ring/pinion/diff unit strength.

concealer404

iTrader: (3)

I mean... i have hung out with the dudes that run 4Piston Racing a few times. Luke is good people.


Sounds easy.

Leafy

iTrader: (1)

Jinx didnt make it sound like he had a hard time doing it, he just has a hard time having the k24s hold together when he spin them over 9000 without baller bottom end parts.

Sparetire

Over on k20a.org, you can pretty well find the recipes for 300 NA WHP K24s. And those recipes basically consist of the following ingredients:

Pistons, rods, bearings, fasteners, oil pump, Kpro, K24a2 head or similar, intake, header, 3" exhaust, cams, springs, retainers, injectors, lifters,......

Those 4 pistons guys have a ~370WHP NA K24 designed to handle road racing and endurance abuse IIRC. Its psychotic.

So yeah, the K is pretty fuggin sweet. But like any other engine the cheap power only goes so far. A 300WHP K is mostly aftermarket parts. (Edit: Or a bunch of Honda parts you did not get with the original engine and swapped in.. Its just that with a K you can basically add 100 WHP or more for most prep levels relative to a BP with basically no weight penalty. And it will probably last longer at those levels than an equivalent BP from what my internet racing has seen.

krissetsfire

iTrader: (1)

I agree with that. It has a nice aftermarket and is a very flexible platform. Good power can be made without extraordinary measures.

I would rather build a k than mess with that j motor for sure. TBH I'd rather go F, change some head studs and boost the **** out of it with a 6758. But I'm pretty sure we've had the f or k convo before.

Savington

iTrader: (31)

I broke my diff drag racing at 200whp. Wheelhop sucks. Never went drag racing again, never broke another diff.

Leafy

iTrader: (1)

I bet you could break a stock diff with wheel hop on stock HP. Wheel hop is so bad for your drivetrain, because physics (and the same reason unsprung clutches are bad).

KMiata

Can't really look at the factory HP ratings. Stock K motors (k20 or k24) are 220-240whp motors in stock form, with just good bolt ons and a tune. Thats why so many people like them. $1000 junkyard longblock that gets the job done with Honda reliability.

And these days 300whp setups are pretty much dime a dozen if you cruise around on k20a.org for a while.

That all being said, I still think the J is cool. Not sure how good of a road race application it will be for the Miata, but I'm sure it will be the solution for some people.

Anyone know about the steering rack situation with this swap?

triple88a

iTrader: (2)

Gotta love people thinking out of the box.

Subbed.

glade

iTrader: (2)

Kit is now available, and in my opinion, not badly priced

If their information is to be considered true, then a 40 pounds weight gain for 100+ n/a Whp and 150+ wtq would easily convince me to consider this. I mean ****, that's about what a stupid light turbo kit ends up weighing in at, and I'm a huge n/a fanboi! (And although not a huge Honda fan, Goddammit they can make some Damn engines!)

JV6 Miata Kit- SuperFastMi

Full_Tilt_Boogie

iTrader: (1)

That whole kit looks straight out of china. The exhaust, clutch, flywheel, and motor mounts are Chinese sure.
Ive personally seen those eBay motor mounts all sorts of swapped Hondas, most of which are cracked or broken. And these are street cars.

Also what is up with the welding on the oil pan and subframe. Looks dodgey.


I feel bad for the immense heartbreak experienced by anybody who buys this kit with expectations of being fast or reliable.
The best this kit could do is be on the cover of Honda Tuning where the readers are dumb enough to think the J series is something to be excited for.

EDIT:

Also, some pro photoshop going on here.



This kit is obviously ready to be shipped.