I need a s13 diff to support 600hp, what are my options - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

AustinTSI · 06-16-2013, 01:33 PM

So as the title says, I have a s13 and I know the differential will not support 600hp. What are my options? I want to stay with the independent suspension and will not put a solid axle in. I don't mind doing a little cutting and welding though to make something fit.

Thanks, David.

*TheRealSy90* · 06-16-2013, 08:02 PM

Z32 differential.

The Dude · 06-17-2013, 05:37 PM

Depends. Is this a drag racing application? If you're drifting or road racing/auto-x it's likely that you will not need to upgrade more than the axles.

AustinTSI · 06-17-2013, 11:28 PM

As for drifting/road-racing/auto-x; I'm not sure yet. I know, that makes it difficult.

I'm using an s13 due to the width of the suspension as I'm putting an entire s13 front and rear suspension into my Chrysler Conquest. The front suspension is so that I will also have rack and pinion steering and it is already all worked out. This will also give me many more options for parts, poly bushings, upgrades.

The rear is for similar reasons with more options for everything. Just try and find something for the Conquest/Starion. I already have a different motor and transmission. The transmission is a T56 so I already am going to have to have a custom driveshaft made due to the length. The s13 diff ratio of 4.08 is perfect for the T56 but my motor will be putting out 600hp and I may use nitrous on top of that so the s13 diff won't cut it.

I've considered the 300zx NA diff but it is only rated at 450hp.

I have been doing a lot of reading on this but most of the posts are written for someone that has relatively in-depth knowledge of these cars. From what I have read though that I could possibly do the following.

1. the q45 diff can be used in an s13
2. the q45 internals are based on the R230 but in a R200 case
3. I can take the ring and pinion out of the s13 and put it in the q45 and have the original 4.08 ratio

Are there any problems with this?

The Dude · 06-18-2013, 04:11 AM

Q45, S13, and Z32 N/A diffs are all R200's. No reason to swap the S13 diff out for another R200, especially if you're wanting the 4.083 ratio.

AustinTSI · 06-18-2013, 07:55 AM

But isn't the S13 diff limited to around 450hp and the Q45 is good for 600+hp ??

*fliprayzin240sx* · 06-18-2013, 08:44 AM

You can keep the R200 diff, your weak point isnt the diff but the axles. The snout/spline into the hub have a tendency to twist like a pretzel once you start hitting a certain torque. Not sure of the number honestly but its not the HP that kills it. I've had buddies in Japan who were going thru stock R200 axles in their R32 RB25 with HX40s pushing over 600whp. One upgraded axles to fix the issue, the other swapped out to the larger R230 diffs/rear end off R-32 GTR/Z32 TT rear ends.

Seraphim38 · 06-18-2013, 09:54 AM

Mazworks sells axles for $1,800 that can take the power. Talk to them, as they build 1,000hp S13s for drag racing beatings. As stated above, the rear end isn't nearly as big of an issues as the axles. I am putting down 460rwhp through a KAAZ 1.5 in an S14 differential with Greddy cover, Energy Suspension bushings. No problems for me so far.

Frank_Jaeger · 06-19-2013, 01:15 AM

Obligatory.

06-16-2013, 01:33 PM	#1
AustinTSI Join Date: Apr 2013 Location: Austin, TX Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	I need a s13 diff to support 600hp, what are my options So as the title says, I have a s13 and I know the differential will not support 600hp. What are my options? I want to stay with the independent suspension and will not put a solid axle in. I don't mind doing a little cutting and welding though to make something fit. Thanks, David.

06-18-2013, 08:44 AM	#7
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	You can keep the R200 diff, your weak point isnt the diff but the axles. The snout/spline into the hub have a tendency to twist like a pretzel once you start hitting a certain torque. Not sure of the number honestly but its not the HP that kills it. I've had buddies in Japan who were going thru stock R200 axles in their R32 RB25 with HX40s pushing over 600whp. One upgraded axles to fix the issue, the other swapped out to the larger R230 diffs/rear end off R-32 GTR/Z32 TT rear ends. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

06-18-2013, 09:54 AM	#8
Seraphim38 Zilvia Addict Join Date: Oct 2010 Location: Washington Posts: 810 Trader Rating: (6) Feedback Score: 6 reviews	Mazworks sells axles for $1,800 that can take the power. Talk to them, as they build 1,000hp S13s for drag racing beatings. As stated above, the rear end isn't nearly as big of an issues as the axles. I am putting down 460rwhp through a KAAZ 1.5 in an S14 differential with Greddy cover, Energy Suspension bushings. No problems for me so far. __________________ Mazworks \| HKS \| Greddy \| T4 GTX3076r \| Full Race \| Tial \| SPL \| Feal

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06-17-2013, 05:37 PM	#3
The Dude Zilvia Junkie Join Date: Sep 2003 Location: TN Age: 36 Posts: 357 Trader Rating: (4) Feedback Score: 4 reviews	Depends. Is this a drag racing application? If you're drifting or road racing/auto-x it's likely that you will not need to upgrade more than the axles.

06-17-2013, 11:28 PM	#4
AustinTSI Join Date: Apr 2013 Location: Austin, TX Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	As for drifting/road-racing/auto-x; I'm not sure yet. I know, that makes it difficult. I'm using an s13 due to the width of the suspension as I'm putting an entire s13 front and rear suspension into my Chrysler Conquest. The front suspension is so that I will also have rack and pinion steering and it is already all worked out. This will also give me many more options for parts, poly bushings, upgrades. The rear is for similar reasons with more options for everything. Just try and find something for the Conquest/Starion. I already have a different motor and transmission. The transmission is a T56 so I already am going to have to have a custom driveshaft made due to the length. The s13 diff ratio of 4.08 is perfect for the T56 but my motor will be putting out 600hp and I may use nitrous on top of that so the s13 diff won't cut it. I've considered the 300zx NA diff but it is only rated at 450hp. I have been doing a lot of reading on this but most of the posts are written for someone that has relatively in-depth knowledge of these cars. From what I have read though that I could possibly do the following. 1. the q45 diff can be used in an s13 2. the q45 internals are based on the R230 but in a R200 case 3. I can take the ring and pinion out of the s13 and put it in the q45 and have the original 4.08 ratio Are there any problems with this?

06-18-2013, 04:11 AM	#5
The Dude Zilvia Junkie Join Date: Sep 2003 Location: TN Age: 36 Posts: 357 Trader Rating: (4) Feedback Score: 4 reviews	Q45, S13, and Z32 N/A diffs are all R200's. No reason to swap the S13 diff out for another R200, especially if you're wanting the 4.083 ratio.

06-18-2013, 07:55 AM	#6
AustinTSI Join Date: Apr 2013 Location: Austin, TX Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	But isn't the S13 diff limited to around 450hp and the Q45 is good for 600+hp ??

06-19-2013, 01:15 AM	#9
Frank_Jaeger Zilvia FREAK! Join Date: Jan 2012 Location: Port Charlotte, Florida Age: 29 Posts: 1,352 Trader Rating: (1) Feedback Score: 1 reviews	Obligatory.