5 speed power capabilities with boost
 

Hey just wondering how much power can a 5 Mt hold looking at boost

Some of it.

Hey just wondering why you can't read the stickies instead of posting.

Oh if only this was documented somewhere on this site.

I don't know why these guys are being such dbags when all you did was ask a simple question.

The stock 5 speed is kind of a glass case and will break pretty early, like around 5-8 psi. The rods, on the other hand, are super strong, good for 20+ psi. People put Miata rods in all sorts of other engines as upgrades. Little race secret for ya ;)

Trae - it depends on the year of the transmission.

90-93 5MTs are generally luck of the draw - some go at around 150hp, others have been documented to 475hp for hundreds of track hours.

Starting in 94 and going through the 97MY in North America (98MY everywhere else), they pretty much all became butter. 175hp is generally the limit, some have gone to 200hp. There are no documented '94-'97 transmissions running over 215hp long enough to get a good dyno pull in.

To fix this problem, mazda re-looked the 5 speed, but since they ran out of time for the '98 model year, they adapted the old RX7 trans to the Miata in North America for only the '98 cars. Those RX7 transmissions are beasts - there are only 2 documented cases of the '98 RX7 trans going in the Miata, both well over 650AWHP.

Starting in '99, Mazda had generally fixed the problem, and all of the 5 speeds from 99 through end of production are generally expected to hold 450-500 HP for the life of the car. The '99 and on transmissions use different mounting points, though, and are not compatible with any previous Miatas without also replacing the entire front subframe and using the shorter PPF.

Isn't this dependant on what turbo is being used? I can imagine it grenading at 5-8psi with a huge turbo, but I've had no issues at 12 psi with my little TD04H.

Hey now, no real info allowed. We are trolling a noob here.

Shit, whoops.

I grenaded my 5sp with 900whp, but I was granny shifting not double clutching

Congrats OP

You are the 1,000,000th person to ask that question! As your prize, you will be awarded as much sarcasm as we can fit in this thread. If you want an answer, search.

If you double clutch all of your shifts they've been track proven to be pretty reliable upwards of 350+ hp. Its the horsepower that kills them not the torque.

just install a 1.6 that way you limit your horsepower but have diesel-like torque

I'm actually using diesel in mine right now. It required different spark plugs but the torque output is increased by about 38%. It also lets you belch giant clouds of black smoke when you floor the throttle, which is pretty cool.

I hear diesel in a Miata is a pretty cool thing. :party:

No dude, size of turbo, type of clutch, driving style, etc. Has nothing to do with how long the parts will last. Only how much boost you're pushing. Don't you know that's why that's the only question people ask anymore? "How much boost will the engine take" cuz that's all that matters.

Quit complicating the situation with facts.

I guess I deserve an eggplant as much as OP this morning.

when I go car shopping, the one and only question I ever ask is: how much b00zt will it hold bro'z

Fun Fact: customer at work buying a new Jetta GLI at work the other day, overhear them asking the sales person "how much boost does it put out?"

Go with the 4spd, much stronger and better for boost because of the longer gearing. The 4spds only came on the 89' model year so you have to look a bit, but they are out there (most people "upgrade" them to the 5spd because they are stupid).