Those that daily boosted cars, do you run a 6spd trans?
 

I know the general consensus is that the 5spd is good for around 250rwhp and 6spd for 300rwhp. (Correct if I'm wrong.)

So do those of you making around 300 just use the 6spd out of the MSMs, or are there other options?

Just curious, I saw something about a TII adapter plate, but think that was an older thread.

not many other options that are cheap and easy to do

From my understanding that all takes bellhousing adapters/mods which aren't as cost/time efficient as throwing a 6 speed in there.

You can also get into the transmission itself and make it stronger that way but $$$$

At 300whp on a daily driver I think you need to plan on something other than a stock 5 speed. 6 speeds came in a lot of NB's, not just MSM's. Not sure what you're planning but I don't think you'll find a lot "only car" daily driver Miatas making that much power. You can do it, but you really want to have a plan for a backup method of transportation.

6sp/3.63s here. Gears are a little tightly-spaced for a street car but it works. On flat ground and through neighborhoods I'll take off in 2nd. 6th is ~3500rpm at ~75mph GPS. Right on the bottom of the powerband of my setup (built VVT motor + EFR6758) so I can still squirt around people without a downshift. You'll never find a cheaper option for the same strength unless your friend owns a CNC mill and you value both his time and your time at $0.00/hr.

yes

Thanks for all the responses guys!

I am planning to do a build a realistically I don't see me making or needing a 300whp setup. I was just curious for those that do!

I daily drive a my 5 speed turbo. Probably a bit under 300whp. But a lot of torque low down. Almost always 2nd gear wheelspin

This is my second 5 speed because 3rd gear of the other 5 speed totally sheared of

I dont like the 6speed in a high torque car but im going to do it anyways because thats the only cheap option. Im going to with the 6speed+3.6 ratio

In my 10th anniversary i have an 6speed+3.9 and that is a great option ratio for that car. But thats a completly stock car

Anyone ever run a 4.10 with a 6 speed? I have one in my donor car I plan to run with a obx lsd. is this a good idea for a daily?

not really.

I did, gears are really short.

+1 on 6 speed and 3.63 gears. I love mine

Lots of people have -- that's the stock setup in an MSM. It's pretty terrible in most circumstances, especially once you're above stock power.

I love 6 speed+3.9 at 200hp.

At 300hp not sure how much I'll like it.

I have a 4.1 kaaz to try with the t5 ratios if I get it in ever.

I have this setup too, but only drive it for work occasionally. The gearing is fine.

The shifter sucks. It's better with the MR shifter, but the gates are still a little too close together left to right. The more I drive it, the less likely I find the wrong gear, though. Practice, practice, practice.

I wish I had a 3.63, but alas I was sent a 3.9. Anyone want to trade an OSGiken w/ 3.63 for a 3.9?

Ha! Too bad you live across the country! Would run outside to start pulling my 3.9 right now.

He has a 3.9. wants a 3.6

I think he didn't have his coffee yet. He has a 3.9 and wants 3.63's

This is exactly what I just came back to post. I was literally making my coffee when I wrote that. Derp!

Carry on gents!

I was referring to Psyber that he didn't have his coffee yet but i guess that fit the bill for you also!

I don't know. It seemed to make sense for me. I'm asking if anyone wanted to trade an OSGiken 3.63 for my OSGiken 3.9. Maybe just semantics but I'll clarify.

Restated:
I have an OSGiken differential built with a 3.9 final drive when I was lead to believe I was being sold a 3.63. I made a mistake and didn't confirm before hand because the part was brand new and special ordered. Alas, after install, my speed and RPM did not match up and all calculations point to this being a 3.9 ring and pinion.

My proposition is such that, if anyone wanted to trade their 3.63 equipped OSGiken for my 3.9, I'd facilitate the trade plus shipping.



Though, as niche as the 3.63 gears are, I'm basically pissing in the wind since I doubt anyone will want to give theirs up as it was selected with purpose. I honestly didn't think this thread would derail over such a silly chime.

OP, I've daily driven my car that is equipped with a pleb non-MSM 6 speed and haven't had issues. That being said, having run a 4.1 and now a 3.9, the mechanical advantage to the wheel is higher meaning I'm not loading the gears as much with any reactionary force offered by traction with the ground as would be the case if using a longer final drive (3.63).

Yes, stock shifter sucks. I have the MR shifter. Shifts a lot better, occasionally I'll find the wrong gear too. Yes definitely PRACTICE!

I've run 4.10's and a 6 speed for a while and I liked it in a n/a car. Even with a modest FI setup I think it'd be fun as long as you don't mind rowing through gears.

1-3 is squirrely easing onto the throttle with a 4.1. It was interesting to feel the torsen have a bias to one side when both wheels are slipping.

Aidan: At 340hp w/ 3.9 and 6spd here, it's not too bad to street but I really want to switch to 3.6 down the line as there's a lot more shifting than I'd like. Glad I have a bumped redline as AutoX would be a challenge with the gear spacing ATM.

You have way more power than I was running. 3.9 + 6 speed is great at 200hp. I could pull out of certain corners faster than @turbofan, and i was only running ~160hp on the track. (he was ~230hp with 6spd+3.6)

I'm interested to see how it feels with more power.

I think i would probably go getrag before i dropped $$ on a 3.6 gearset.

Truth, and it pissed me off lol. We swapped cars later in the day and it totally explained why he was on my bumper out of several corners. Tiny turbo and slightly shorter gearing meant he was in the meat of the powerband while my car was still waking up.

That was so, so much fun.

6-speed (out of an MSM) + 3.636 here. It's great, I love it. As I've said in several other threads on this topic, 1-5 are spaced just like the 5-speed + 4.3 that came with the car except it'll hold more power and there's an extra 6th gear up top.

6-speed + 3.9 sucked. It was annoying on the street and really really annoying at autox. I only had that combo in the car for about a month, so I never went to the track like that. That was at 270 rwhp, it'd be even worse at the 340 the car has now.

--Ian

argh, duplicate post.

So everyone that runs a 6spd have held a little over 300?

Do you guys do anything to make sure it'll hold the power or just put them in and hope for the best?

And is there any difference between a non MSM 6sp and MSM 6spd?

If 30-50hp is a little over....

Kids these days.

You strike me as someone who like to worry about things. You seem to worry when you don't have anything yet to worry about for someone who in another thread said you'd be happy with a little over 200whp. You just might crave anxiety.

Supposedly the MSM trans is stronger because of some process, shot peening of gears or whatever. You make sure it holds by being mindful and respectful of the power; also it usually it boils down to using one of three clutches which you can use the search function to find. If you need to google mechanical empathy, then reconsider your trans option. It's the cheapest and most direct way to hold a reasonable amount of torque. If you're really worried about it, then develop a trans solution for the rest of us who, aside from a select few, haven't had extreme issues with the 6 speed other than bitching about the shifter feel.

For your power goal, "do it once and do it right" will definitely fall into the realm of a 6 speed. But if you want to add complication, we'll be here to watch.

Whose bitching about the shifter feel?

I'm only asking questions to keep the conversation going and to get your opinions/advice rather than reading a thread from 2011 and going based off that info. My bad for staying up to date?

I guess the right terminology wasn't a "little" over 300, but you know what I meant.

You aren't going to make a little over 300 on an mkturbo setup though....

Read build threads. See what others have done and why, understand and draw conclusions of your own.

Do you even read your own threads?


I've also switched to a MiataRoadster shifter. Stop worrying about things, read your shit, and what discussion does there need to be?

I just changed out the bushing for the Miata Roadster Delrin bushing. Was a lot cheaper made a big difference