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Rx7 s4 turbo 2 rear end strength

Old 07-16-14, 09:11 PM
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Rx7 s4 turbo 2 rear end strength

Hey guys im looking to tune my Fc for drifting and am running a built turbo 2 motor. How much power is the stock turbo 2 rear end capable of without breaking for drifting? Looking to go around 350hp but would like 4-500 if possible if it would still be safe on the rear end. Let me know thanks!
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Old 07-18-14, 02:59 PM
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Guess I'll share my experience since it's been 2 days w/o responses. Im making about 275 peak HP at the wheels and 215tq. I ran at the Balcony with dial tones, 195/60/14 tires, at 25-27psi which gave me a ton of grip for how skinny the tires are.

Anywho, I was clutch kicking it all day and had no issue with the diff. And this is the same diff I used to run 225/50/16's on when I had my carb set up for over a year. And correct me if I'm wrong but I think Jeremy Lowe ran an NA diff for his 2012 season, laying down some 500hp? I remember seeing a post on Instagram about this.

I think the main thing you want to look at is the weight of your wheels. And if you're doing amateur stuff, just stick to 17's as 18's have more rolling inertia.

Just my .02 cents
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Old 07-18-14, 11:22 PM
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Originally Posted by ruddyrid View Post
Guess I'll share my experience since it's been 2 days w/o responses. Im making about 275 peak HP at the wheels and 215tq. I ran at the Balcony with dial tones, 195/60/14 tires, at 25-27psi which gave me a ton of grip for how skinny the tires are.

Anywho, I was clutch kicking it all day and had no issue with the diff. And this is the same diff I used to run 225/50/16's on when I had my carb set up for over a year. And correct me if I'm wrong but I think Jeremy Lowe ran an NA diff for his 2012 season, laying down some 500hp? I remember seeing a post on Instagram about this.

I think the main thing you want to look at is the weight of your wheels. And if you're doing amateur stuff, just stick to 17's as 18's have more rolling inertia.

Just my .02 cents
Thanks for your response. I believe right now im running 300hp on a basic street tune. My mechanic was running over 500hp on his setup but the blown an axle so thats why im hesitant. It would be badass to have that much power and still be safe. Anyone else have other experience? Please share thanks!
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Old 07-21-14, 11:41 AM
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Broke a Tii axle or axle stub shaft?
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Old 07-21-14, 08:29 PM
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I was holding out...found this a while back.. If I break an axle I may go this route judging on how hard it is to get close to new(doubt it) t2 axles.

http://www.rx7store.net/DriveShaft_S...ls%2086-91.htm

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Old 07-22-14, 03:44 PM
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Someone had asked this question before, but i cant remember when i replies to him.

The Turbo rear end is pretty stout. Its more based on the Torque. Itll Hold probably a Max Close to 500tq. I would not worry too much


FWIW, FD drag guys swap out their torsen units for S4 clutc types when they run slicks so they dont go breaking things. Although that is not always the case.
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Old 07-23-14, 02:12 AM
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i dont think anyone's figured out an actual number, but yeah the 5-600wtq range is probably about the limit, as is just about any stock (and stout) 80's/90's differential. it's one of those things where it might break on someone making 450 and it might last 3 years for someone else making 650. and even at that point IIRC it's the output shafts and axles that are more likely to break than the differential itself (or the ring/pinion, after long term use)

if you're really concerned about breaking stuff, switch to ford 8.8 rear end, and enjoy the limitless/cheap final drive options and never worry about breaking it. ever.

just stay away from NA diffs. pretty much every single drift-newbie who comes out around here with some kind of swap with NA rear end pops it within an event or two.
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Old 07-23-14, 02:50 AM
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With a dual cam KA swap, I drove the **** out of my welded NA rear end. Multiple events and two years of street use with 140ish whp/tq. Never had a problem with it.

That being said, my 1jz swap is coming close to an end and I'm going ahead and putting a t2 rear in, as soon as I can find one. A bunch of guys have also run NA rear ends with power and had them fine. Jeremy Lowe for example. However, it's worth it to me to go ahead and take the precaution and put a solid clutch type in, as guys have also blown up rear ends on stock NA motors. It's really hit and miss.
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Old 07-23-14, 09:42 AM
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ComicArtist can probably attest to the strength better than most considering the KA puts more TQ than the stock S4 NA. Im sure so long as there isnt too much strain put to the diff you are fine. I.E. Slicks, Wide tires with low hp?

My friend has snapped the stub shaft on his NA with 225/50/16 on the rear of his NA with ports wired open so im sure he had no botom end. lol

Id be more comfortably telling you the axles break first
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Old 08-04-14, 12:06 AM
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thanks for the reply guys... i think ill go ahead and milk as much power i can get out of it then thanks!
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Old 09-15-16, 06:29 PM
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Get the Lifetime Warranty Axles ...

Originally Posted by lowjack7 View Post
thanks for the reply guys... i think ill go ahead and milk as much power i can get out of it then thanks!
I am sure it sucks replacing axles every time they break but I suppose you could buy the ones with lifetime warranty from Autozone. Then at least you'll never have to buy another set.
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Old 09-28-17, 06:48 PM
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I'm probably going to get some hate for this lol..... Before i was a running a s14 with big wheels and 450 hp 375 tq sr20. I drove it hard for years and only blew 1 tranny.....not bad considering other guys break every few events. I'm pretty confident to say it was because i ran STOCK engine and tranny mounts. New every year but stock. I believe the stock mounts allowed the engine to float a little more and absorb the drivetrain shocks. Thus not sending that much of a shock to the rear end. I'll probably do the same thing in the fc i'm doing now.

Last edited by Monika; 09-28-17 at 06:51 PM.
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