z32 5 speed vs s15 6 speed

[MICRoS13]

I'm just getting ideas of building a strong based sr20 with a good drivetrain anyone has pros & cons for both ?

[kouki munster]

Why? Are you planning to make north of 400 hp and launch the thing from 5-7k rpm on some stupid sticky tires?

The stock sr/ka trans is good for the 400-500 hp neighborhood.

The general consensus on the s15 6 speed is that is will let go some where in the 350 hp range.

The z32 transmission will hold some big power but they suffer from 3rd gear syncro problems.

[xX RB Xx]

The S15 is considered weaker because it Is the exact same as the s13/s14 trannys, but then they decided to put another gear in.

I would just stick with the stock transmission.

[OutToWinPAHC]

and then there is the true 6 speed nismo trans...

[kouki munster]

The S15 is considered weaker because it Is the exact same as the s13/s14 trannys, but then they decided to put another gear in.

I would just stick with the stock transmission.

Not exactly, it is weaker because they made the gears in it thinner so that one more gear could be put in without making the transmission any longer.

[MICRoS13]

yeaa im looking for around 450whp range with some hard launching at the track so i was moving towards the z32 transmission plus it's gonna be my daily till i get a 1g dsm

[nissanman04]

yeaa im looking for around 450whp range with some hard launching at the track so i was moving towards the z32 transmission plus it's gonna be my daily till i get a 1g dsm

DSM as a daily driver? More like a monthly driver...

[kouki munster]

Even still, a good condition stock transmission should last for a while, but if you got the monies and will be doing hard launches on a semi regular basis, stuff the z32 unit in there. You will also want to look into upgrading the axle stubs as hard drag launches in a car with sticky tires and making power in the mid 400 hp area tend to snap them.

[MICRoS13]

DSM as a daily driver? More like a monthly driver...

lol yea.. what's so bad about them besides transmission problems ? like 1st thing ill do is make the transmission stronger throw in like a 20g turbo + meth + rebuild sounds like a good daily plus it's all wheel drive .. & yeaa even when money is low & you have a love for a car patience & saving up will be the best plus i get chauffered since im still in high school working & paying no bills
Modified by MICRoS13 at 8:06 PM 11/18/2009

[safin]

+2 for the z32. not from experience though but i have heard about the 3rd gear synchros' problems so many times already

don't do meth on the daily

[MICRoS13]

alright I'll look into & i think mazworx has some experience with sr20 with a z32 transmission

[xX RB Xx]

Not exactly, it is weaker because they made the gears in it thinner so that one more gear could be put in without making the transmission any longer.

that is what i was going to say but i didnt. I was running late to work.

[Ajax]

Doesn't the S15 transmission also use a different speed sensor than s13/s14? I seem to recall that was one of the fixes in the Nismo transmission.+3 for z32

[OutToWinPAHC]

The nismo transmission was the heavy duty 6 speed in the S15 Spec R model. And probably a different VSS

[kouki munster]

that is what i was going to say but i didnt. I was running late to work.

Its all good, but just remember the internets is serious business.

[MICRoS13]

mann i wonder how much they go for but z32 transmission it is !

[AZ89two4Tsx]

Not exactly, it is weaker because they made the gears in it thinner so that one more gear could be put in without making the transmission any longer.

Isn't the S15 trans. longer just for that reason? I hear you have to swap to a shorter drive shaft and possibly the diff? Idk, I was shootin the breeze with a shop owner and that's what I was told. That's why an S15 motor swap is so freakin expensive.

Another gear on the highway would be REALLY NICE though.

[S133P3R]

mann i wonder how much they go for but z32 transmission it is !

iirc the nismo 6speed retails for like $10k new....

[AZ89two4Tsx]

iirc the nismo 6speed retails for like $10k new....

What a great option!

$10,000 transmission in a 90s economy car! FAIL

[kouki munster]

Isn't the S15 trans. longer just for that reason? I hear you have to swap to a shorter drive shaft and possibly the diff? Idk, I was shootin the breeze with a shop owner and that's what I was told. That's why an S15 motor swap is so freakin expensive.

Another gear on the highway would be REALLY NICE though.

The only reason people swap in the whole s15 diff(as opposed to just the carrier and axle stubs) is so that they can have a working speedo with the s15 6 speed because the vss is in the diff.

I don't know the length of the s15 transmission vs. the s13/s14 transmission but it is a known fact that it (s15 transmission) has thinner gears, which makes me think that both trannys would be very close to the same length.

Just because he is a shop owner doesn't mean that he is an expert, don't take it as fact untill you can confirm it on your own.
Modified by kouki munster at 9:17 PM 11/19/2009

[AZ89two4Tsx]

I know, I was kinda only half listening.

But he's done it before so I trust him, lol.

Doesn't matter either way, I might want a 6 speed, but it just ain't worth it.

[kouki munster]

I was the same way when I was getting my chit together for the sr swap, original plan was get a s15 motor set, throw it in, and call it a day, but after thinking about it I said screw it, got a s14 motor set and put the $1000 I saved at the time to making more power, and not crying because I would have turned that 6 speed in to metal shaving/gear oil slurry in an aluminum package by now.

[homeslicej2]

http://octanereport.com/news/4....html

This article states that Nissan designed the stock 5-speed to handle 217 ft lbs of torque and the NISMO 6 speed unit to handle 289 ft lbs. I find both under-rated as members have repeatedly put 400+ ft lbs through the stock 5 & 6 speeds. NICO member Broadfield has a stock S15 6 speed (unless he's changed it) and has run in the high 11's in 1/4 mile. Contact him. The non-NISMO 6-speeds from the S15 have the speed sensor located in the differential carrier though. That is why if you use a stock S15 trans, you need the the diff housing too. The NISMO unit remedies this by locating the speed sensor in the trans just like the S13/14 trans do. EDO performance and RHDJapan both sell the NISMO 6 speed, as does Tomei USA. It is around $4,000 just for the trans from EDO and RHD, plus you need the driveshaft and other items (though I have seen the trans sell for ~$2500 new, just can't remember where and I need to go to bed). EDO, RHD, & Tomei sell the other items. For a good condition Z32 trans & the conversion kit from Mazworx, it would be a cheaper (IIRC), and better if you plan on moderate to frequent drag use, to go Z32. Those transmissions are known to handle ~1000hp. If you plan on more highway driving & want to spend the $, I would go with the NISMO unit and a stock S15 diff with the factory gear ratio (3.54) installed for low RPM highway cruising.

[S133P3R]

throw a RB20 flywheel &a 350Z clutch kit on there and call it a day.

or white bunny that b****.apples and oranges.

[MICRoS13]

alright cool what about the driveshafts for the z32 ? should i just get a whole n/a rear diff also cause of the gearing ?

[kouki munster]

The na z32 and the 240 diff share the same gear ratio, and the drive shaft will have to be custom.

Also, both of thoes questions could have been answered with a quick search of this site or google.