Miata+4g63+T56=awesomeness!

[cudvig]

I am currently researching this project.

I am currently building a narrow block 4g63. I plan on using a T56 transmisson but could also opt for a T5. I have researched the FC transmission from a turbo rx-7. It would be a lot easier if I could find a wideblock 4g63 or 4g64. I have not started looking into rear ends but I could imagine I could have a huge list of possibilities. I want the car to hook up and hopefully with the right combination of tranny/rear end I could end up with some high top speeds also. haha! I plan on spinning the motor to well into 9000 rpm and making 400-500 HP with a 35R or maybe 50 trim?

I have a couple of questions:

What do current owners of a T56/FC/T5 know about them? Power levels? TQ holding? possible to spin to 9000RPM?
should I use solid motor mounts?
Will evo intake manifolds bolt onto a 1g/2g 4g63? I have some rerouting to do with the manifolds but oh well they will be getting replaced anyway.

Any other comments/suggestions welcome!!

Discuss,

Colin

[TkrPerformance]

the rear end that is pretty much a bolt in is the Ford 8.8 out of a thunder bird with disk brakes

[cudvig]

Is that possibly the same 8.8 that is in the CTS-V? I have heard the CTS-V one works as well and is stronger than the thunderbird one.

-Colin

[AJ]

Awesome, would love to see a Miata rock'n a 4G63!

[asshanson]

Don't use the 04/05 CTS-V rear diff, the case is not strong. The 06/07 is a bit stronger though. Maybe you're talking about an 09+ rear diff, but I imagine those are $2k+ and impossible to find used.

My T56 is holding 520wtq, and I know a few V guys are running at least 600wtq on them without any issues, never revving past 6500-7000rpms though. I bet the Viper guys spin them faster, but the Viper spec ones are pretty spendy. Maybe slowbubblecar can chime in on those.

[cudvig]

I am not worried about the T56 not holding the TQ/HP goals I have. I am concerned about the ability to spin it to 9000+ Maybe I will just back down the RPM and increase the boost? I want something a little more driveable than a stock tranny DSM gear ratio. I figure the gearing on a T56 is a little longer and will be able to utilize my goals better.

Do you happen to know the ratio for the CTS-V rear end by chance?

-Colin

[Pushit2.0]

I would knock down that 9000+ by at least 1000rpm. You can not have your cake and eat it too, any setup that will make street able power should not be reving to 9000rpm+. If you have full boost before 5000rpm there is no reason to want/need to rev past 8500rpm. If you are looking at a 50trim, then plan on shifting around 7500rpm, a 35r is a lot bigger and will make/hold power to about 8500rpm. I am basing these numbers on a 2.0, if you have a 2.3/2.4 then knock the rpm down again, by about 15%.

~John

[FattyBoomBatty]

Just get a g54b, I have one attached to a conquest that I'll sell you for 7 grand.

[cudvig]

Yeah I was thinking the same thing. I really don't need to make that much RPM but it would be nice. :)

Hopefully I'll opt for the 35R. That should get me the goal power I want and maybe some more room to grow?

It will be a built 2.0.

-Colin

[turbotalon1g]

Sickness. I would love to see this happen.