Difference between SR20's

[silvia02aeroR]

What's the difference between the S13, S14, and S15 SR20DET engines? Which one is better? I've heard that the S15 is the worst because of the 6 speed instead of the 5 speed transmission. Is this true? FYI I searched for about 20 minutes trying to find information on this...

[Badfish]

Read all the stickies at the top of this forum first.

Like the Frequently asked questions thread zerothread?id=145184and this onehttp://forums.nicoclub.com/zerothread?id=59346

[silvia02aeroR]

Looked there didn't help any.

[karmakaze]

What's the difference between the S13, S14, and S15 SR20DET engines? Which one is better? I've heard that the S15 is the worst because of the 6 speed instead of the 5 speed transmission. Is this true? FYI I searched for about 20 minutes trying to find information on this...

there really isn't a "better" one.

there is a rumor that the 6speed transmission is weak. i don't know if this is true or not, but i would be inclined to think that mechanically the transmission is sound. but if you look at the actual gear ratios, you end up with the same gear ratio at the end. so you actually won't get much more out of the 6speed transmission other than a more difficult install because the speed sensor is on the differential instead of on the transmission.

the most important difference between the s13 and the s14/15 is in the head.

the s13 has a high port head and the s14/15 has a low port head with VTC. VTC adjusts your timing at low RPMs to maximize low end torque and then disengages after a few thousand RPM. If you ever plan to go with an intake cam larger than 256 then go with an s13. because to make them work in your s14 you have to disable VTC. plus if you ever really start putting on some heavy modifications the high port head of the s13 will help you out with higher hp goals. on the other hand, s14/15 engines are newer. so you stand a greater chance at getting a lower mileage engine.

in the end though, they are all the same damned engine with very similar potential plus or minus a few things .

I personally went with the s14 notchtop. because i drive a 95 240sx and that engine was the same year as my car and my HP goals are 400-450. For those numbers I was not to concerned about the advantage of the s13s high port head. especially since i am geared towards maintaining a good amount of torque as well.

as you read and get used to this forum, you will also learn, that most of what I just said is an opinion. There are plenty of people who will defend there s13, s14, s15, ka, rb, or ca over all other engines.

Most of what i just said is mentioned is also in the stickies.

[Morph]

there really isn't a "better" one.

Omg dude u lie. Every 1 in the know knows that the S17 coming out next summer is going to be the best sr ever

[TanManS14]

Ya, what he said, but also remember the different turbo's on the s14 and 15 as apposed to the s13. s14 and 15 have a t28 ball bearing tubo , with faster spool, and its slightly bigger, with a little more potential. s13 has a t25 journal bearing turbo, this one is also smaller, and spools slower.

[karmakaze]

Ya, what he said, but also remember the different turbo's on the s14 and 15 as apposed to the s13. s14 and 15 have a t28 ball bearing tubo , with faster spool, and its slightly bigger, with a little more potential. s13 has a t25 journal bearing turbo, this one is also smaller, and spools slower.

actually only the s15 manual was ball bearing.

the s13 s14 and s15 automatic were all journal bearingsthe s13 is a t25and the s14 and s15 automatic turbos are identical t28.

[Dori Dori]

S14 turbo IS ball bearing as are all s15 turbos. S15 manuals had the inconel turbine and wastegate exhaust divider built into the housing.

[Nismo_Freak]

S14 turbo IS ball bearing as are all s15 turbos. S15 manuals had the inconel turbine and wastegate exhaust divider built into the housing.

No, there are at least 4 different part numbers for the S14 & S15 turbos.

The turbine is more than likely not inconel as well, as the turbo was built for Nissan contracted through Garrett. Nissan is why the S13 and S14 turbos had ceramic turbines as well, and I'd be willing to bet the S15 turbo has a ceramic turbine as well.

From what I've seen on the S15 turbos the turbine appears to be ceramic due to the standard thickness of the blades.

[Dori Dori]

There's at least 100 trustworthy sources on the net that say otherwise so I dunno...

[SpeedRacer1]

Sigh...

S13 SR20DET's got the same turbo (14411-50F00) Journal bearing.

S14 Auto's got the EXACT same turbo as the S14 Manual (14411-69F00) And these turbo's are ball bearing.

The Special Edition S14 Silvia K's MF-T got a special IHI turbo (14411-RP801) This S14 produced 250hp. I dont know the specs on the turbo.

Some say the Nismo 270R got a regular S14 turbo.

The S15 had 3 turbo's in its lineup. The Auto's all got S14 turbo's (14411-69F00). The early model S15's (Jan 1999 - Oct 2000) got the ever popular "S15" turbo (14411-91F00) that everyone tries to get. After Oct 2000 the Spec R (Turbo model of the S15) changed to another turbo (14411-75F00) This turbo is found on Australian Spec S15's. These are all ball bearing turbo's as well.

Euro spec S14's got two different turbo's. From April 1994-July 1996 they got the late model S15 turbo (14411-75F00). From July 1996 on they got some other turbo in their kouki model (14411-82F01)
Modified by SpeedRacer1 at 7:57 PM 3/15/2006