Rx8 diff swap?
 

I have a na miata so my oem 6" diff is as weak as a box of animal crackers so I had planned on dropping in an entire tll drivetrain but the availability around me for rx7 parts is limited. The rx8 diffs are looking very attractive with there 4.44 fd. Would it be possible to put an rx7 outer axle cv on a rx8 axle? I ask bc I already have some miata hubs machined for rx7 splines. Has anyone completed this other than the nc miata guys?

oh man.. periods.. are.. your friend....... ... ... ... ... ... .. ... ... .

Sorry I thought this was a miata forum....... I'll move it to the grammar forum........

It isn't that we expect perfect grammar, but if you are asking for help, the least you could is put some effort into making it easy for people to read. If you type questions that way, you will not get many, if any, educated useful responses. It makes it seem as though you don't care enough, so why should we?

If you don't have any answers to my question other than talking about my grammar then don't post.

If you don't have an answer to my question, then please don't post. I don't understand grammar or sentence structure.

You haven't been here long have you...

Probably wont stay long either...

I guess I know one member who doesn't have the answer for my initial question.

So use a 1.8 7" diff?

The 7" diff is an option. I would like to use the rx8 diff bc it's a 8" diff

How many 7" diffs have you broken?

I'm glad you feel entitled to answers from us.

I haven't torn up any diffs. I'll be doing some drag racing with the car and I'd much rather put a diff in that's beefy enough to handle anything. I've seen some destroyed 7" diffs and axles in other threads.

I don't feel entitled to answers. But this is a forum for asking questions and being talked down too about my grammar seems childish.

Not using understandable, legible grammar is what's childish.

The diffs aren't really what's known for breaking in these, it's most often the axles as you mentioned.

Anyhow, I'm done ball busting.

Just remember: If people are blowing up diffs and axles and you hyper-beef up those parts, then something else (probably more expensive) will break instead. Many like Bryan who have broken axles choose to keep replacing broken axles when they go because they'd rather break axles than transmissions, engines, or whatever else.

Very true beefing up one part will cause something else to break. I've got a turbo ll trans I'm installing also. I'd like to have a solid drive train to keep from replacing parts. The engine will be the weak link.

I agree my grammar isn't very good and will probably never be. I'm a welder by trade so it's not really on the top of my to do list.

Your grammar is fine now.

Tis cheaper to replace axles than engines. Just a thought.

Thanks for the input

You seem to of pryed your answer out of one of our nicer members, but please remember we have a warning for poor grammar for a reason. The site as a whole enjoys answering easy to read posts.

And is being a welder really your excuse for forgetting your language education? You wrote better the more we teased you about it, all we ask is a little effort be put into each post.

How much power are you making?

That's easy. Allofthetorques, because 12A rotary.

Cars not put together yet just wire tucked. I've got a hx35 going on it. I'd be happy with 300whp.

Fuck! Anyone else see what I see?

It says newb but I've been on here for years. But I'd rather sell the car than ask another question. Especially if no one knows the answer.

If you had bothered to search, with this statement, you'd have realized how goddamn stupid this question is.

Hint: 7" gears are known to be good to ??? hp, require no fabrication, and are bolt in. So, what's the ???

I'm sorry you feel that you have to take the lords name in vein. I've done plenty of research that's why I asked the question about the rx8 diff. There isn't much info for that particular 8" diff. If the 7" diff was the best thing since sliced bread s2000 owners wouldn't swap them out. My intent is to spend the money on heavy duty drivetrain parts now rather then buy 2-3 transmissions or differentials.

You say you want to buy heavy duty parts so you don't have to replace them down the road but you also say you'll be drag racing. Those two don't go together.

I have a tii rx7 trans and diff swap in my car. I plan on drag racing a bit. I already bought the spares for when I blow these first ones up.

You'll probably get decent life out of a 7"

just don't drag a torsen.

If you need a big rear end, don't be a tard, get a Ford 8.8 swap from V8 roadsters. Its the best option for big power drag launches and you won't be reinventing the wheel. I went to the drag strip once, I came home with a blown torsen. It blew in the burnout box from wheel hop. Ditch the PPF for drag!!!

Monster Miata has the Ford swap too.

I believe V8roadsters just released a kit for the Getrag and keeping the PPF. Don't know about the 8.8 but you could ask them.

I haven't been on the forum lately but it's nice to see the same shit going on.

Yo, Leo, Bro. Don't patronize us. Registered January of 2009. Saying you've been on for years. Please. Then stating stuff like you want a new rear end for reliability, eluding to the 7" not being enough. Bro. Please. Bro. Then stating you'd be happy with 300hp. Bro, dude, bro. You've read about as much of mt.net as you have your 5th grade writers inc book. please.

Our literal advice is not going to cut it. YOLO build and give us the finger.

Not sure why you would want the PPF if you are upgrading for drag racing though. My understanding is that the flex of the PPF is what allows a lot of the wheel hop to happen which is what is breaking diffs. I ditched the PPF for a solid front mount on the diff and solid rear mount on the trans in hopes to eliminate wheel hop

The PPF has absolutely nothing to do with wheelhop, IMO.

With solid axle cars/trucks wheel hop a lot of times comes from axle wrap. I'm not sure about the mechanics of the movement of an IRS but if the diff is allowed to rotate it can lead to wheel hop when it rotates then unloads.

Toyota Tacomas are known for this. Too bad I didn't know it before I bought. It drives me nuts, but the dealers claim it as "normal". Just can't get on it from a stop or it lurches/hops when it shifts.

Traction bars will normally fix that. It happens to a lot of leaf sprung trucks.

Because it twists.

Which traction bars stop :p

Does the same twisting happen with the miata suspension. Anyone have some undercar video?

Yes, the leaf springs on the Miata allow it to wind up. You can install traction bars to stop it.

https://www.miataturbo.net/attachmen...ine=1418135131

cheap drag racing diff. if you blow it up with a 1.8l i'll mail you $20.

It's a serious issue. If you let it go too long, they can permanently deform into coils.

I meant does the stock setup allow for any twisting. If it did it would explain why solid mounting could help.