Jump to content
SAU Community

S14 Vs S15

Kiwimatt

By Kiwimatt,
in General Automotive Discussion

 Share

Recommended Posts

TTT Grand Master

TTT

Posted
Posted

there has been alot of discussion on this S15 turbo lately.

Everyone thought that they were ball bearing turbo's on the S15, but recently there have been a few revelations.

a whole heap of people that have taken the turbo off there S15 have sent it to be checked and/or rebuilt and have been told that they were NOT ball bearing turbo's.

And actually have the same part number as the Turbo's from the SERIES 1 S14's.

apparently there are 2 different S15 turbo's and the other variant IS ball bearing.

Also, I believe that the S15 has some form of Variable timing control where as the S14's don't.

AND, the S15 runs 480cc injectors. The S14's have some lower capacity ones.

So to answer your question of will and S15 turbo make your S15 better?? MAYBE!..

But I don't think it would be THAT much of a difference..

If I were in your situation, I would save some money and do 1 of 2 things...

1.)Have your turbo rebuilt and Hi-flowed.

2.)Buy a new 450HP turbo from www.horsepowerinabox.com for like $2000..

Link to comment
https://www.sau.com.au/forums/topic/26055-s14-vs-s15/#findComment-552341
Share on other sites
Nismodified Proficient

Nismodified

Posted
Posted
Originally posted by Kiwimatt

Can anyone out there tell me the difference between the sr20dets in the s14's and s15's, and the differences between the two turbos ?.  If i was to replace my s14 turbo with a s15 turbo, what kind of power increase could i exspect ?

it really depends on which s14 you have. If it is a very late model then the turbo is the same as s15 turbos, both have vct etc..

I know the S15 has a T28 BB turbo and is capable of 200rwkw MAX i think

A recent dyno run of a modded S15 with stock turbo netted him 227kw's. Yes i know its only a number but they are very good turbos.

May i suggest www.silviansw.com or www.nissansilvia.com for further tech advice:)

Link to comment
https://www.sau.com.au/forums/topic/26055-s14-vs-s15/#findComment-552413
Share on other sites
ido09s Mentor

ido09s

Posted
Posted

Only the Jap spec S15 got a BB turbo, much to everyones disbelief, Aussies always get ripped off..... apparently the way of telling is that there is 6 dump pipe bolts on the Jap spec turbo, only 5 in the Aus spec turbo. if you find the BB turbo expect to gain about 20% power increase i guess.....

As for why the S15 goes better, they are tuned more on edge hence giving them the advantage over the S14.

Engines appear to be identical, all S14's got the VCT from memory, but mainly the internals you will find are different. Many people think you can strip down any SR20 and swap parts without hassles...... hate to tell you it doesnt work :P:(

Link to comment
https://www.sau.com.au/forums/topic/26055-s14-vs-s15/#findComment-552582
Share on other sites
Kiwimatt Contributor

Kiwimatt

Posted
  • Author
Posted

Thanks for all the help guys, sounds like a aftermarket turbo will be the way to go, just thought a s15 turbo could be a good way to get a cheap moderate power increase. I did some research on the net about the s14 and 15 engines, seems like even nz gets the extras on the s15, how come aust is always left out.

Thanks

MATT

Link to comment
https://www.sau.com.au/forums/topic/26055-s14-vs-s15/#findComment-555068
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • iain_ST44GA
      M35 VQ25DET starter motor

      By iain_ST44GA · Posted

      Hi Guys, Does anyone know any aftermarket part numbers for a starter motor to suit the VQ25DET? I can find lots of alternative part number for the VQ35DE, which I assume would fit, but there is a lot of conflicting information out there. Thanks..
    • Murray_Calavera
      R33 GTR running -9 with no tune

      By Murray_Calavera · Posted

      I don't understand how this hasn't boiled down to - Upgrade the turbo when you have everything required. ECU, injectors, fuel pump, turbo, etc. Do it all at once.  If you don't have everything required, just enjoy the car as it is and keep saving up your pennies. 
    • Duncan
      R33 GTR running -9 with no tune

      By Duncan · Posted

      Sounds like you've got an interesting adventure ahead here with local support if you have trouble! My guess is that, unboosted, you will be OK with a small upgrade like -9. What will happen is that once the stock ECU sees more airflow than it expects it will add a heap of fuel and pull a heap of timing to be safe because it can't understand how it could get that much air without there being an issue. You will see clouds of black smoke and it won't pull hard through the midrange and top end. So, overall it will be a bit frustrating but should be OK. If you are still nervous set the base timing back 2o through the CAS, but it will be even more sluggish everywhere. As said above through...this is not my guarantee your engine won't be blown into a million pieces, leaving you looking for very hard to find parts A better idea is get a computer with logging ASAP, wire in a wide band O2 sensor and a use remote tuner. I've done multiple cars this way and while it is not as good as a specific tune on a dyno they can get it 90% right. I'd suggest if you can afford an R33 GTR these days you can afford an ECU and tune. And if you can't afford that you sure won't be able to afford the rebuild if it goes bad in the meantime,.  
    • Duncan
      New kid on the block

      By Duncan · Posted

      Yeah it would be nice if someone took the time to put that sort of information together, but there are a lot of variations in looms. I think you are making this way hard for yourself if you just want to get it running....sourcing an SR20 with the right wiring will be a billion times easier than matching the RB loom to an S15 chassis. If you do end up going this way, you just need to trace every wire in the loom with a multimeter, 95% of them will go to a location you can confirm at the ECU.....and then post it up for the next person who needs it  
    • Duncan
      Coolant leak?

      By Duncan · Posted

      Just top it up with water, and keep a general idea of how much you added. It is normal for water to be pushed into and pulled out of the reservoir through the cap, and it should not be more than half full or it will be likely to overflow when hot. Any decent mechanic can do a pressure test of the cooling system to confirm if you have a leak. Keep in mind if it is only leaking a little and when hot it may well evaporate before you see it hit the ground
×
×
  • Create New...