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Mazda MX-5 Miata 1991

Thinking about doing a 1.8 swap on my 91′. Can I still keep the 1.6 rear end?

Thinking about doing a 1.8 swap on my 91′. Can I still keep the 1.6 rear end?

Jovan

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24 Answers

David

Yes since you already have converted to the 5 speed from a 1.8

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David

Yes, Torsen would be worth it though

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JovanQuestion author

@David wait I have a 1.8 trans? I’m pretty sure it’s a 1.6

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JovanQuestion author

These are things I really should remember lol

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David

Lol Even if it isn’t. Are you using the clutch I gave you? If so your flywheel and clutch will bolt right up to the 1.8

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JovanQuestion author

Yea I used your clutch and I got a 1.8 flywheel.

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David

It’ll bolt right up then.

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David

Doesn’t matter, trannys are the same 1.8s have Better clutches stock they are bigger stock and can handle more, that’s why 1.6 guys get a 1.8 flywheel and clutch, Transmissions are the same I believe and rear ends bolt up the same, The Torsen is LSD is what’s fun though way easy to kick the rear end out

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JovanQuestion author

If not, it’d be a good opportunity to get a brand new clutch/flywheel once you wanna do your engine swap

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David

Ya that’s would work also.

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David

Just get the flyinmiata 1.8 swap kit and put it in, Light weight flywheels are definitely worth it IMO but it will all work fine

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David

Ya that’s would work also.

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JovanQuestion author

I don’t want to run a lightweight flywheel on the street but it’s worth looking into

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JovanQuestion author

David, I’ll look more into it. My 1.6 still has a lot of life in it but I just gotta keep an eye on my oil

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David

Why not? I did in my NA, it wasn’t unbearable to drive at all, and I am probably going to put one in my NB, My NA burned a little bit of oil but as long as I kept it topped off it was always good

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Dan

The real question is ‘how long will my 1.6 rear end last?’

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JovanQuestion author

I’m actually considering welding my 1.6 diff and later doing a 1.8 Torsen swap

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JovanQuestion author

Are 1.6 rear ends that weak?

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David

Why wouldn’t it last? There’s open diff 1.8 NA Miatas too, it’s not like a 1.8 makes an insane amount of power more than a 1.6, it will last fine

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David

I have redline dumped the hell out of my 1.6 Miatas and done 1-3 burnouts roasting tires, kicked the clutch around corners no problem, Unless you’re putting In a built 1.8 and boosting it don’t worry about if the 1.6 rear diff will hold up

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Dan

If you run real sticky rubber and do hard launches with a 1.6 diff, it’s gonna die.
I ran a JRSC 1.6 for like 7-8 years without a problem… normal tires. Then I slapped on some Falken Azenis rubber, which was stickier than anything I’d ever run… and the diff was dust in 6 months. A second 1.6 sized diff was swapped in, and it lasted less than a year.
If your tires are spinning, the rear is safe. if you use R compound autocross tires, or anything close to that, and then do ‘drag’ style launches, it’s not going to last.
Burnouts are just hard on tires. They are no big deal for the diff… It’s hooking up hard that does the damage.

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JovanQuestion author

Gunna stay on the stock 185’s for awhile. So I won’t have to worry about serious grip. By the time I run 205’s or 225’s I’ll have a Torsen most likely

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Dan

My first one tossed a tooth off the ring gear less than 3 days after a trip to the drag strip… 2 of my launches had my clutch slipping, and I’d never felt it slip before. After 4 runs I quit because I was worried about the clutch. Didn’t realize I’d probably doomed the diff. The second 1.6 diff was beat on in ‘drive like a dick’ street driving.. and it actually lasted a while with the Azenis RT615’s considering. I mean it didn’t bust the 8th time I launched hard on it… it got abused… but only lasted 8-10 months before the pinion gear spit out a chunk of it’s teeth and the rear blew up bigtime. (Much more violent than loosing one tooth off the ring… that was actually able to limp home screaming like a banshee!)

If you drive your car with a compound you can spin… or slide… don’t drive like John Force off the line… a 1.6 will last for a while, possibly years behind a 1.8. It’s the abusive wheel-hopping launches combined with serious sticky rubber that overwhelm it.

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Shackleford

@Dan put it perfectly!

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