So you need those fancy rear hubs to fit the spline to have better axles?

 

What fancy rear hubs? According to mazda the msm and the normal miata use the same rear hub.

 

OHHHH s2000 spline to the diff, my bad.
But I was talking about these:
RX7/S2000 spline hubs.
http://www.miataroadster.com/miataro.../i-581084.aspx

Mainly I hear our axles are incredibly weak.

 

Those hubs are interesting!

 

Those are interesting. But what axles is the question. If you put an MSM/S2k Giken or torsen in a miata case, and use those hubs, can you just use s2k axles? Or do you call drive shaft shop and tell them you want s2k axles in a different length?

 

The rx7/s2000's use a beefier shaft/28spline I go believe. Yes, different length, exactly what I planned on doing. The last thing I want on my car to go is something I need to move/baby it home. I've heard our stock axles braking with stock power.

Taken from: Solomiata : Drivetrain : Interchange

differential shaft diameters and splines:
7" small axle = 25mm x 24 spline (808, RX-3, 79-83 RX-7)
7" large axle = 27mm x 26 spline
7" S2000 = 29mm x 28 spline
7.5" small axle = 27mm x 26 spline '84-03 B2000/B2200 & early 95-97 Sportage
7.5" large axle = 29mm x 28 spline ('98-05 Sportage)
8" = 31mm x 30 spline. TT/TII/929

 

The only cars I've personally seen break axles have been cars on 275 hoosiers with bolt on+tune power, and we determined they were breaking them because they were too low. Raised the ride height up on one of them and it hasn't broken an axle yet after ~20 drag launches at this point.

 

meh like Bryan was saying in his thread I'd rather keep stock axles and replace one every once in a blue moon then worry about exploding the 6sp or torsen or clutch.

Gotta keep the weakest link the least expensive.
Or just build EVERYTHING (which is not cheap to say the least)

 

I dont even really think its the cost. The option for a stronger diff that goes in easy, the RX7TII with 929 front and fab'ed PPF mount, doesnt have good ratio options. The 7.5" or 8.8" dont really have very good LSD options, there's torsens, "clutch types", and lockers but no salsibury diffs, and take a bit more fabrication to put in, but are dirt *** cheap. Or the speedway quickchange diffs are expensive and require the same fab work as the ford diffs but have even more ratio options and good LSD selection.

Trannys, theres the TII with a bell housing adapter and PPF adapter. which I'm still not 100% I like the ratios or confident that its significantly stronger than the 6 speed. The T5Z with BEGI's new bell housing and shifter and PPF adapter thats about to come out, which sounds like the best option on paper if you can get the right rear end ratio behind it, or custom gear ratios, assuming the BEGI parts fit. Or the SFI bell housing adapter that gets you adapted to any circle track or drag tranny you could hope for that have near infinite gear ratio choices and can be had to support 800hp for under 3k with custom ratios, downside is 4 speed, 4th gear is 1:1, or using a TKO500 but it comes with the same problems as the T5Z.

 

I like the idea of T5Z
Specs and discussion I found: http://www.ffcars.com/forums/66-2006...nsmission.html
So begi is making to where we can use this trans with stock rear? The 330 ft/lbs rating is nice scine its made for v8 torque it's made to handle it all at once not the inset of boost. I like having 6 speeds if it was anywhere near being good for a "cruising gear" but nope not with my rear diff.
I've been thinking about the rx7 rear to it seems to be strong anyone have numbers they can throw out of how much they can handle?
Sorry ryan I seemed to of jacked your thread for diffs :P

 

That is some really good MPH you have there, enough to put you in the mid elevens if you can get the car to work better in the first 60'.

What are the dimensions of the Hoosiers you have in the pic?

 

No worries, it's all good info to have.

Troy, they are 880 Racing Hoosier 26.5/8.0-15 "Roadster Edition." They are the tires we use on our race cars, so I have quite a few spares and old good used ones that work good for doing stuff like this

 

Coils shipped today Ryan, should get them in a few days so you should be getting them early next week!

 

No real updates, I have scheduled a dyno session for the 8th of July. I want to see what it is putting down currently before buying my new Borg Warner. After the drag strip I had a terrible noise around 2500-3200 RPM, I swore it was the turbo. So I rebuilt the turbo, the thrust bearing was completely smoked and black. So I thought that was the issue, well it wasn't. Rebuilt it again using a different CHRA, same thing. Well after looking and looking and looking I found the tab for the dump tube broke, causing it to vibrate on the downpipe which traveled up to the turbo.

TL;DR Had noise, found noise, fixed it.


As the car sits with a half tank of gas in it.

 

Correction:

tl;dr: Had noise, replaced a bunch of non-related things, replaced them again, found noise, fixed it.

 

did you make a smoke stack through the hood?

 

Shooting flames out your hood now huh

 

LOL, awesome.

 

Post up the dyno plot Ryan

 

This sounds good...