S14 or S15???

[SlideWays S14]

I have a 95' 240SX. Its time for a swap and i have been debating between the S14 SR or the S15 SR. I was just wanting to know what some of yall think i should do? Thanx, Nick

[BuudWeizErr]

S14.

[DonDonati88]

S14 cheaper and just as good.

[I H8 UR DSM]

s15

[keepitmovin]

If you got too much money send me some and get the s14...

[Dori Dori]

S15 b/c it's newer and has more power. That makes it better.

[bp2ooo]

if you have enough cash get the s15... But if it is a matter of buying an s15 motor, and not modding, and buying an s14 motor and getting a bigger turbo, with the 2 grand you have saved, then buy an s14 motor.

[I H8 UR DSM]

s15

[I H8 UR DSM]

(thanks matt) ; )

[DonDonati88]

s13 high port...ALL THE WAY BABY

[BuudWeizErr]

s14

Fixed

[whites14]

s-15 gotta like that extra gear and more hp

[lessthanjakejohn]

If your modding >>> S13

Stock>>>>s14

[Dori Dori]

S16

[cow]

How come virtually no one provides any reasoning behind any of their choices? What makes one motor better than another? I'm sure the port design difference between S13 and S14/5 are important, as well as other factors.. everyone just seems to have their personal favorite with no data to back it up. :\

Just wondering..

[bretts15mr2]

I personally would eitheir get the S13 motor or the S15 motor, but not the S14.The S13 motor with all nec parts and install $3800 capable of 240 wheel hp with stock turbo.S14 $4000 capable of 255 wheel hp stock turbo.S15 $5800 capable of 300 wheel hp stock turbo and 6 speed transmission instead of 5. I would eitheir get the S13 and buy a bigger turbo or S5 turned up to 300 hp.

[BuudWeizErr]

How come virtually no one provides any reasoning behind any of their choices? What makes one motor better than another? I'm sure the port design difference between S13 and S14/5 are important, as well as other factors.. everyone just seems to have their personal favorite with no data to back it up. :\

Just wondering..

Because this topic is a dead horse. And the search is the tool to stop people from beating it.

[Holisticbeatz]

S-15

[SpeedRacer1]

Of course nobody could really answer this question without knowing what Nick wants to do with his car. Drifting: S13, Drag: S13, Autocross: S13.

But my opinion doesnt mean anything. Id get the S14 since it is easier to install.

The S15 may have an extra gear but its in the same space as the 5 gear trannies and could be prone to failure at lower power levels than the 5 speed. If you get the S15 you also need to make sure you acquire the S15 driveshaft and get the speed sensor which is mounted on the differential (which you also need). You need to make a fabricated transmission crossmember for the 6 speed. I dont think you would have hood clearance issues but an S13 would.

But in all honesty what does the S15 really have that the S14 doesnt? Bigger injectors and a slightly larger turbo, big deal. You can buy both of those aftermarket parts pretty cheap.

Of course if anybody has ever attempted a search they would have found this information out, especially since this gets posted about once a month with all the other noob inquiries.

[ItzGenX]

S15 is a S14 motor with a 6speed, slightly larger injectors, and a slightly larger ball bearing turbo (for 2 grand more?!). If you want to mod the a motor, omit both s14 and s15 because the low port and VVT will ultimately get in the way. An S13 with all the saved up money(instead of S15), can bring you beyond 300whp. Also, you need to learn what benefits the porting and VVT and reasons they were changed. I posted a very informative post somewhere in the past about this subject as for reasoning. Search it, if you cant find it, I still have a saved web copy of it (to send to all the newberts who ask me why). Put it this way, the S13 makes the same amount of torque numbers at a lower rpm then it's later generation S14 and S15 motors. If that doesnt ring a large church bell, then you should really start reading more and less questions.

Answer to original post:S13

[S15_silvia]

im gonna do the s15 engine and transmission because tyhe s15 engine has 250 hp stock and it has a 6speed transmission and alot of the prices i find they arnt that much more? like maybe a grand or 1500 i mean you can get the motor transmission and drive shaft and diff for like 5500 thats not a bad price to me? im willing to pay that much

[S15_silvia]

and also the max psi you can do an s15 is 15-18 psi with all the stock stuff and has been said that should giv eyou around 300 rwhp thats motivation enough to make me buy it?

[S15_silvia]

Performance:

The stock turbo will be safe to 15-18 psi. After that, the turbo is past its efficiency range, and power increases will fall off and are not worth the risk of turbo damage. The engine should produce close to 300 RWHP at safe boost.

thats copied right from the heavythrottle web site

[SpeedRacer1]

The max PSI on the S15 has nothing to do with the actual engine though, all the SR's can take more that 18psi. The turbo will pump out up to 18 psi on a T28. $5500 is rediculous to, for 300 rwhp me since you can get an S13 for $2000 (now seems to be commonplace) and then get larger injectors for 450 and a turbo upgrade for about 2500. That "could" net you 400 hp. Of course it is noted that 400 hp requires alot more parts and tuning but at least the turbo you are running would be capable of well over 300rwhp. Also do remember the S15 doesnt come with 300hp stock, you need to buy a boost controller so knock up that price a bit more(~$450), and you will probably need a proffessional install.

But if you wanted to just buy the S15 injectors ($400) and the T28 turbo ($900 brand new), boost controller ($450) then thats $3300 for your 300rwhp machine. BAM, saved $2200 (not including S15 install), that could go towards ohh maybe say an FMIC, exhaust, etc...

Of course genx, it seems to be "in one ear out the other" to all the noobs.

[S15_silvia]

yes thats true but you didnt mention teh 6 speed trans that you get? it wont bolt up to the s14 or s13 engine and honestly i want the s15 also because it is easier to find with very low miles and its newer

[S15_silvia]

and i plan on getting the s15 then i plan on putting on a bigger turbo along with my upgraded exhast and headers cold air intake a better intercooler and a bov so i should be higher then that the bigger turbo might come a lil later though

[S15_silvia]

and form what i hear the s15 isnt hard to install no harder then the s14 so i believe me and a friend could do it with little problems only thing ill have to worry about is the transmission mounts which my undle is gonna do for me

[SpeedRacer1]

OMG please leave or start learning alot more about cars because ive given up on trying to show you the light. Headers=SR20DET??!?CAI=SR20DET?!?!?BOV=call me when you figure out what it does...Getting bigger turbo?!?! thats the reason you want the S15 in the first place.?!?!?

What about the 6 speed, its (heavily rumored to be) weaker than the 5 speed (S13 and S14) and it does not bolt onto the S13 or S14 chassis. However (go figure) the S13 and S14 trannies bolt up to S13 and S14 chassis'.

Actually its a hell of alot easier to find an S14 front clip with less than 30000miles on it than to find an S15 Clip (or so it was when I last checked).

S15 is easier to install from what you hear?!?! There arent too many companies that have installed S15's and they dont let out their secrets on how they install them. Its not that easy last time I heard about it.

F*** it I give up

[S15_silvia]

i didnt say it was easier and i know what a bov does and whats wrong with putting a bigger turbo on an s15 engine eventually? you know im sorry i dont know nissans that well ive never owned one this will be my first ive never worked on tehm alot either so? but i never said it was easier its just teh company that has the clip said the hardest thing to do on it is the transmission mounts

[S15_silvia]

The engine and transmission will fit into 95-98 S14 US 240SX chassis with minor modifications to the transmission mounts. The differential is needed as the speed sensor is located there.

The S13 chassis requires more work. The driveshaft has different mounting location from the S14 / S15 chassis. Custom work must be done

thats from srswap.com