CNC 7AT Flex Plate
 

Well, I have cracked the OEM flex plate twice already, once on track and once when doing average 100+mph on highway. I was trying to find a better one but nobody makes it except GTM which from what I can tell they only take the OEM one and do some heat treatment to it. I then went to the racing R&D department in my company and had them custom made one for me. Anyways, here're the pictures:

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Wow -- sweet! Let us know how it performs!

Is it lighter/same weight/heavier? Are you boosted or N/A?

If you don't mind me asking, what did it run you and what are the specs (cryotreated?)?

I had them made two, one for my full bolt-on NA track car and one for a TT 600whp G37S. The first thing I thought when I had it installed was: "Is my car on?" The 12000rpm dynamic balance really made a huge difference on the vibration. It feels like an electric car now besides my FI exhaust, lol. I had the team made the flex plate at 2/3 of the OEM weight so it is a bit lighter but at the same time won't lose the top speed. The material used was the highest spec in the SFI regulation for flex plate. To prevent rust and scratches the flex plates has chromium shading on it so it's a lot more durable than OEM ones as well. :tup:

I didn't dyno the before and after flex plate, but since there's a lot less vibration I assume it has less loss from engine. I was also 2 second faster on a 2 minute track this past weekend, so overall I'm pretty happy with it.

Wow -- that's pretty great! Congrats! :tup:

How much did this cost approximately...? I think this might be something others are interested in doing.

WTF IS THIS ?
u crack ur flex plate and u go ahead and make urself a new better one.

i envy this.

very nice work there.

What technique did you use to reverse engineer the factory part for proper alignment of the crank trigger wheel? CMM arm?

It looks like the entire thing is 1 piece, starter ring and trigger wheel machined directly in?

I know nothing about ATs so all I can say is impressive undertaking. Thanks for pushing the envelope:tup:

Oh and you have a 600whp AT G37TT? :eek: What tranny upgrades do you have to hold that much power?

^^ i am very much interested in more details.. what kit..what upgrades op

It took more than half a year to do all the research and design, and my car was down a couple times to test different version of the flex plate, so there's really no final price on it yet besides it'll be probably two to three times the OEM one cost. If there's enough interest I can set up a group buy or look into becoming a sponsor tho. ;)

There's an engine getting the 4.1L upgrade at my friend's shop, so I had the team took all the measurements from that engine and my other transmission laying around. One piece CNC is more balanced than welding a couple pieces together and also much more stronger, so that was the reason even though it cost much more than OEM.

That car belongs to a good friend of mine, and I believe he has a GTM stage 3 built transmission on it. :tup:

I know he spent well over 100k in upgrade, but don't have the list for it. On top of my head he has GTM TT, GTM stage 3 trans, carbon brakes, full exhaust, a lot of cooling, every possible suspension mods, and a lot more that I don't know, lol

How much to make a custom flywheel if I got you the dimensions needed for the friction area, offset, and bolt pattern? :D

Andy, I hate you. You should've had like 10 made, I want one, and it would lower the cost considerably.

No kidding.. I want one and I dont even have an auto. Its just an impressive piece of machine work.

I dont pay a lot of attention to auto stuff because all my cars are manual.. but I dont think I have never noticed a full machined flex plate before, always stamped and welded etc. This thing is just awesome. I am curious what technique was used to machine the starter ring gear.

I'll buy one

I asked the race engineers how it was made. The teeth were done by teeth machine, and the angle on the teeth was done by CNC teeth by teeth, so the whole process was crazy long, lol

I'll talk to the Mods about setting up a group buy, if we can get around 10 ppl or so I can ask the team to produce it. :tup:

message Fast Intentions.. they may have a solution but not sure since I do not have an AT. But they did build the worlds fastest AT 370z ;)

I saw Tony's post on the Facebook page showing he made a CNC flex plate as well for that car but with aluminum. Not sure how he did it but if it's one piece design I'd worry about how long the teeth last tho.

Fast intentions make a flex plate now, if anyone wants one get it from them

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its beautiful!

:yum:

What did you do to model the balloning stress on the plate? I know the diesel guys run into issues there as the case ballons under load and the cnc plates they use dont flex so most switch to a reinforced anti balloning converter case?

(The axial flexing of the plate due to the converter changing shape under load)

I wonder what the price difference and performance difference is between this and Fast Intentions flex plate?

either way it's cool to see more options becoming available finally for the AT.

I mean it's only a 7 year old model well 8 if you count the just released 2016 models.

When my team first made this flex plate, the purpose was to make one that doesn't crack due to torque, not flexibility, so we ran the analysis and avoid having holes at the area where it has lower strength. We added the thickness to the center portion and left the outer part the same, and this is to avoid adding flex strength either. For the material we followed the SFI regulation for the gasoline engine, not the diesel engine one, so the flexibility is within requirement. We also ran a simulation as well as a dynamic balance with the torque convertor on at 12000rpm for an hour, just to ensure everything works and not going to crack in real life.

For now I'm only selling to local owners here in Taiwan, 'cuz I'm not a sponsor and can't sell here. However, if there's enough interest I can become a sponsor or have distributor to do that in the US. I don't know if I can give out price on it without becoming a sponsor tho.

Thank you. Your new oil pan looks awesome, too. Depending on the total amount of oil it holds, I might switch out my GTM one for yours since the GTM one doesn't have a front and back trap door and that's where we need the most. :rofl2:

Its not that we need a front to back trap door most, its that the rear to sump pan slope is too shallow due to the steering rack so oil doesnt like to move forward very well in our pan.

Yeah that was one of my things with the FI flexplate, it looks too stiff

Do you have pictures of the FI flex plate and maybe the material Tony used? I can have my team take a look at it. I believe Tony mentioned on his Facebook that he's using the SFI regulation on the flex plate, so there shouldn't be any big problem on the material if it's designed properly.

the pictures i saw of it where from way back who knows maybe they changed it wasn't cycy89 or something supposed to have had them build it? was his car every finished?

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Found it. It's a two-piece design kind of like the OEM one but with the center portion made of billet aluminum. I don't think it'll be too stronger depending on the thickness of the plate, but I believe our one-piece design has the advantage of a higher manufacturing accuracy and precision, with less NVH level.

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how nice of you to engrave my initials into that one. does that mean it's mine? lol

looks good! good work.

:tiphat:

ahhh this bieng my first auto car, I am lost....This part goes in the transmission? I though i was a sealed unit? Looks like an amazing piece....in for some schooling

CNC 7AT Flex Plate
 

Flex plate basically serves the same purpose as the flywheel in a MT

thanks man!


lets get a GB going