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Fd3s transmission and other questions

 
Old 05-26-2018, 09:01 AM
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Default Fd3s transmission and other questions

Before y'all start bashing me or telling me i m dreaming, i have a fully built bottom end and stiffer springs in the head. I got an 8.8 irs with a v8roadster kit. My transmission choice was an fd3s because i could not find a tII. Tranny is at the machinist getting a bellhousing conversion from another 5 speed i had. My question is who ese is running same drivetrain as me ? Second question who else is running and fd3s tranny? Third question, if u answer yes to any of the first 2 questions, how much power u got on it, and did u ever brake one ?
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Old 05-26-2018, 09:03 AM
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And one more things, i did try to use google but... last guy who posted about an fd3s was back in 2012 or 2010 so yeah dont tell me to use google
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Old 05-26-2018, 12:44 PM
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Most people who are going to the work to swap transmissions these days are going with the BMW option. The FD transmission is a lot more work than the BMW one because of the weirdo pull-type clutch, and the ratios are spaced wider than ideal.

I have an FD transmission, but it's in my FD.

--Ian
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Old 05-26-2018, 12:50 PM
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Originally Posted by codrus
Most people who are going to the work to swap transmissions these days are going with the BMW option. The FD transmission is a lot more work than the BMW one because of the weirdo pull-type clutch, and the ratios are spaced wider than ideal.

I have an FD transmission, but it's in my FD.

--Ian
I got one a year ago for a deal i could not pass on and looking at price wise going to a bmw transmission will run me close to 2.5k compared to the fd3s about 1k.
How much power u pushing ? Do u drag or roll race or just track it?
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Old 05-26-2018, 12:55 PM
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Originally Posted by chrisabidaoud View Post
I got one a year ago for a deal i could not pass on and looking at price wise going to a bmw transmission will run me close to 2.5k compared to the fd3s about 1k.
How much power u pushing ? Do u drag or roll race or just track it?
My FD is stock. My Miata makes 340 at the wheels, but I'm still blowing up 6-speeds, I haven't gone down the transmission swap road on it.

I suggest reading through this thread: https://www.miataturbo.net/race-prep...riences-73618/

--Ian
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Old 05-26-2018, 02:18 PM
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Red through most of it until i got bored reading. Seams like everyone had their own opinion on gearing but no actual proof of how much it can hold... i dont care about gearing as much as i care about how much it can hold. In fact i like the gears on the fd the fact that 5th is longer which is what i m looking for and besides Ever could be adjusted with the correct ratio in the diff and tire size
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Old 05-26-2018, 04:58 PM
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DIff & tire size do not allow you adjust spacing between gears.

--Ian
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Old 05-26-2018, 05:04 PM
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Originally Posted by codrus
DIff & tire size do not allow you adjust spacing between gears.

--Ian
Was talking as far as rpm wise
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Old 05-26-2018, 11:41 PM
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Nothing fixes shitty gear ratios. Not tire size, not R&P ratio, nothing.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 05-26-2018, 11:43 PM
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Originally Posted by Savington
Nothing fixes shitty gear ratios. Not tire size, not R&P ratio, nothing.
If you dont like them doesnt mean they are shitty JS.
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Old 05-26-2018, 11:47 PM
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I never said I didn't like them. I said they're shitty. It's objective. not opinion.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 05-27-2018, 03:21 PM
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They are fine for street use. I have the FD box on my car for the last 2.5 years @400whp.
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The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 05-27-2018, 03:22 PM
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Originally Posted by Reverant
They are fine for street use. I have the FD box on my car for the last 2.5 years @400whp.
Thank you for a reasonable answer
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Old 05-28-2018, 01:37 PM
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No problem. I have no doubt that the ratio will suck on the track or at an autox event, however I have no complaints on the street.

Beware though that these boxes do suffer from bad synchros, and if I recall correctly they are double on 2nd and 3rd, so somewhat expensive to replace.

The box itself will let go above 400wtq; the weak point is the shaft, which twists under torque and eventually snaps.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
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Old 05-28-2018, 01:43 PM
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Originally Posted by Reverant
No problem. I have no doubt that the ratio will suck on the track or at an autox event, however I have no complaints on the street.

Beware though that these boxes do suffer from bad synchros, and if I recall correctly they are double on 2nd and 3rd, so somewhat expensive to replace.

The box itself will let go above 400wtq; the weak point is the shaft, which twists under torque and eventually snaps.
I had the transmission laying around for a year now and thought it would be cheaper putting it in the miata than doing a bmw tranny swap. It will be mostly running on the streets or drag racing so not too worried about autox. Some people were able to put more than 500 tq on them but i wanted to get more info from any guy running it in a miata
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Old 05-28-2018, 03:36 PM
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400wtq is not an absolute limit, but the more you go above that limit, the sooner it will let go.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 05-28-2018, 04:15 PM
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Originally Posted by Reverant
400wtq is not an absolute limit, but the more you go above that limit, the sooner it will let go.
Thanks for the input
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Old 05-28-2018, 08:43 PM
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I wonder if a z32 drive line would be too much work. I only mention it cause they are good for 600 or so HP and they weigh about twice as much. I miss my z32 :(

Last edited by 90LowNSlo; 05-28-2018 at 08:45 PM. Reason: typo
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Old 05-29-2018, 03:56 AM
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That would be a great gearbox but probably doesn't fit - it's huge. It's also much more expensive than the BMW gearbox.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 05-29-2018, 09:36 AM
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Reverant is the only person i've heard of using this gearbox. I'm sure he has his reasons for using it (maybe supply is different in Greece.). In the US, it's not used because we have better options. Try google some more.
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