386 RWHP @ 13PSI, Turbo-NA w/GT4088R, Aux Bridge, etc.
09-06-07, 12:35 PM
#26
Engine, Not Motor
Thread Starter
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
I don't know if I've ever dyno'd a rotary from idle.
Well, you're brave, ill give you that. Sounds like a big ford 9" is in your future......
09-06-07, 03:54 PM
#28
I have injector envy!
don't be too stubborn. A $100 used T2 rear will be a hell of alot smarter than custom halfshafts and some Kaaz LSD stuffed into the N/A rear. I know your a smart guy, just loose the N/A idea thats burned into your head and go the cheap effective route.
It's not like you are gonna be in the Guiness Book of World Records for the fastest all N/A turbo Rx-7
It's not like you are gonna be in the Guiness Book of World Records for the fastest all N/A turbo Rx-7
09-06-07, 05:13 PM
#29
Senior Member
iTrader: (1)
Join Date: Aug 2003
Location: WI
Posts: 535
Likes: 0
Received 0 Likes
on
0 Posts
Any NA (and quite a few TIIs) that I have seen take "alot of abuse from a v8 swap" has ended up in pieces. Suit yourself if you want to try it.
09-06-07, 10:58 PM
#30
tom port.. AKA streetport
iTrader: (6)
Join Date: Jan 2005
Location: ludlow, pa
Posts: 4,659
Likes: 0
Received 0 Likes
on
0 Posts
don't be too stubborn. A $100 used T2 rear will be a hell of alot smarter than custom halfshafts and some Kaaz LSD stuffed into the N/A rear. I know your a smart guy, just loose the N/A idea thats burned into your head and go the cheap effective route.
It's not like you are gonna be in the Guiness Book of World Records for the fastest all N/A turbo Rx-7
It's not like you are gonna be in the Guiness Book of World Records for the fastest all N/A turbo Rx-7
09-07-07, 08:08 AM
#32
I believe Aaron's after the fact that so many people are against it.
Would a TII diff work and be stronger? Obviously, the guy's not handicapped. But can an N/A rear end take some SERIOUS power and stand up to an awful lot of abuse? He's proving that right now. All the people who tell the newbies around here "don't bother leaving your N/A rear in the car after the TII swap since it won't hold the power" are eating their words while Aaron burns around twon with 400bhp blazing through his N/A diff. Will a TII diff take more? Sure. But this is holding up quite well. And even a TII diff has its limits. Locals are busting axle cups on hard launches with slicks at Aaron's power level. So why bother going that route since it'll break anyways? (same mentality as the N/A rear to begin with....you see?)
The car is a turbo'd N/A I don't know what's so hard to understand
Would a TII diff work and be stronger? Obviously, the guy's not handicapped. But can an N/A rear end take some SERIOUS power and stand up to an awful lot of abuse? He's proving that right now. All the people who tell the newbies around here "don't bother leaving your N/A rear in the car after the TII swap since it won't hold the power" are eating their words while Aaron burns around twon with 400bhp blazing through his N/A diff. Will a TII diff take more? Sure. But this is holding up quite well. And even a TII diff has its limits. Locals are busting axle cups on hard launches with slicks at Aaron's power level. So why bother going that route since it'll break anyways? (same mentality as the N/A rear to begin with....you see?)
The car is a turbo'd N/A I don't know what's so hard to understand
09-07-07, 09:08 AM
#33
I believe Aaron's after the fact that so many people are against it.
Would a TII diff work and be stronger? Obviously, the guy's not handicapped. But can an N/A rear end take some SERIOUS power and stand up to an awful lot of abuse? He's proving that right now. All the people who tell the newbies around here "don't bother leaving your N/A rear in the car after the TII swap since it won't hold the power" are eating their words while Aaron burns around twon with 400bhp blazing through his N/A diff. Will a TII diff take more? Sure. But this is holding up quite well. And even a TII diff has its limits. Locals are busting axle cups on hard launches with slicks at Aaron's power level. So why bother going that route since it'll break anyways? (same mentality as the N/A rear to begin with....you see?)
The car is a turbo'd N/A I don't know what's so hard to understand
Would a TII diff work and be stronger? Obviously, the guy's not handicapped. But can an N/A rear end take some SERIOUS power and stand up to an awful lot of abuse? He's proving that right now. All the people who tell the newbies around here "don't bother leaving your N/A rear in the car after the TII swap since it won't hold the power" are eating their words while Aaron burns around twon with 400bhp blazing through his N/A diff. Will a TII diff take more? Sure. But this is holding up quite well. And even a TII diff has its limits. Locals are busting axle cups on hard launches with slicks at Aaron's power level. So why bother going that route since it'll break anyways? (same mentality as the N/A rear to begin with....you see?)
The car is a turbo'd N/A I don't know what's so hard to understand
09-07-07, 10:09 AM
#35
Engine, Not Motor
Thread Starter
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
I considered using the TII diff, but why? Most of them are high mileage, and getting to the point where they are just plain worn out (as are many of the TII transmissions as well...) anyway. If I'm going to have a diff rebuilt, why would I not just stick with the NA diff and fill it with superior aftermarket parts? Philosophically it's far more in line with with I've been doing with the car so far and it's going to be far better then a TII unit. Besides, at more then 400 HP the TII parts start to get a bit delicate as well...So the choice boils down to starting with an NA diff and having it rebuilt with new stuff, or starting with a TII diff and having it rebuilt with new stuff. No advantage either way except the fact that the NA unit is a direct bolt in. Then if the half-shafts break, I just have new direct replacements fabbed up and I'm good to go...
zbrown is launching his GT42 powered REW car on the anti-lag using an NA rear end and slicks.
Would a TII diff work and be stronger? Obviously, the guy's not handicapped. But can an N/A rear end take some SERIOUS power and stand up to an awful lot of abuse? He's proving that right now. All the people who tell the newbies around here "don't bother leaving your N/A rear in the car after the TII swap since it won't hold the power" are eating their words while Aaron burns around twon with 400bhp blazing through his N/A diff.
Will a TII diff take more? Sure. But this is holding up quite well. And even a TII diff has its limits. Locals are busting axle cups on hard launches with slicks at Aaron's power level.
The car is a turbo'd N/A I don't know what's so hard to understand
09-07-07, 04:35 PM
#36
Senior Member
iTrader: (1)
Join Date: Aug 2003
Location: WI
Posts: 535
Likes: 0
Received 0 Likes
on
0 Posts
Do what you want, I'm not trying to argue with you, just saying, I wouldn't want an NA diff in my car, in fact, the TII diff is on it way out as soon as I get some custom axles for my new rear made up, although, I have other reasons, besides strength to go with a different rear end.
Since you mentioned V8 swaps, it may not be a bad idea to take a few pages out of their book, a pinion snubber and/or a diff anchoring bracket will go a long way to help from tearing the front mount off the subframe. The stub shafts and ring gear will then be the most likely things to break. Stub shafts are fairly random, but you'll likely take a few teeth out of the ring gear before it comes completely apart, so just listen for it howling.
09-07-07, 04:58 PM
#37
Then you know no people who run real power 
I've personally watched 3 S4 TII diff's give up the ghost at Toronto Motorsports park. One of them in a pretty spectacular manor @ half track.....and I'm not there very regularly either.
Read above statement And if you don't believe me, come up to the track and ask the prep team who had to scour the around for 20 minutes picking up/sweeping chunks of ring gear 
I've personally watched 3 S4 TII diff's give up the ghost at Toronto Motorsports park. One of them in a pretty spectacular manor @ half track.....and I'm not there very regularly either.Read above statement
And if you don't believe me, come up to the track and ask the prep team who had to scour the around for 20 minutes picking up/sweeping chunks of ring gear
09-07-07, 08:07 PM
#39
Senior Member
iTrader: (1)
Join Date: Aug 2003
Location: WI
Posts: 535
Likes: 0
Received 0 Likes
on
0 Posts
Then you know no people who run real power I've personally watched 3 S4 TII diff's give up the ghost at Toronto Motorsports park. One of them in a pretty spectacular manor @ half track.....and I'm not there very regularly either.
Read above statement And if you don't believe me, come up to the track and ask the prep team who had to scour the around for 20 minutes picking up/sweeping chunks of ring gear
I've personally watched 3 S4 TII diff's give up the ghost at Toronto Motorsports park. One of them in a pretty spectacular manor @ half track.....and I'm not there very regularly either.Read above statement
And if you don't believe me, come up to the track and ask the prep team who had to scour the around for 20 minutes picking up/sweeping chunks of ring gear
09-08-07, 10:17 AM
#41
Engine, Not Motor
Thread Starter
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
The whole concept of the car is turbo-NA, so if I am going to swap a diff it's going to be with something totally custom and not based on TII parts.
Since you mentioned V8 swaps, it may not be a bad idea to take a few pages out of their book, a pinion snubber and/or a diff anchoring bracket will go a long way to help from tearing the front mount off the subframe.
Posts like this remind me of 7 years ago when people would say "plz post when your engine blows up".
I'm not saying the NA diff won't blow up, but at 500 RWHP the TII diff will too.
09-09-07, 04:14 PM
#44
I think the weaker link in both turbo and non turbo cars is the transmission. Again the turbo unit is more stout but even 300 RWHP can grenade one......seen it multiple times.
09-10-07, 09:37 AM
#46
Engine, Not Motor
Thread Starter
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
That of course depends on the application, we run turbo diffs at 500 HP with zero problems on road courses. Drag Launches CAN certainly be quite a bit harder on drive train parts. But, for those who dont drag thier cars regularly the TII and FD units are VERY stout. Certainly nobody can argue they ARE NOT stronger than the NA FC and FB units...
But during lapping days (if I ever manage to actually get out there...) I won't be worried in the least....[QUOTE=patman;7318317]very nice!
is this on 9.4 or 9.7 rotors?
[quote]
9.4:1
next time can you have them turn off the shading and the curve smoothing?
10-01-07, 10:32 AM
#49
nice results.
When I was making around that power level I was starting to have traction problems in 3rd, with an LSD...
If you plan on hitting up st. thomas this year and want to borrow my slicks just let me know, I see 11's in your future
When I was making around that power level I was starting to have traction problems in 3rd, with an LSD...
If you plan on hitting up st. thomas this year and want to borrow my slicks just let me know, I see 11's in your future
10-01-07, 11:57 AM
#50
GhostSS
Join Date: May 2005
Location: Phoenix, AZ
Posts: 281
Likes: 0
Received 0 Likes
on
0 Posts
Why are HP and TQ crossing each other at 6k? HP is based on TQ and they always cross each other at 5,252. Something is up with how the dyno is setup...
HP=TQ * rpm/5,252.
HP=TQ * rpm/5,252.