s15 on s14 blacktop

[xs042sx]

im upgrading from a s14 t28 to a s15 turbo on my s14 blacktop i wanna know what injectors should i run with a hks actuator on 15 lbs ?????

[Sileighty_85]

im feeling nice.

550cc inj. Dont have to but i would upgrade to Z32 Maf to be safe plus to help get rid of the restrictive Stock MAF.

Search man its been covered

[!Zar!]

What engine management do you plan on running?

[xs042sx]

Stock ecu i would need a tune correct?

[Teambadrun]

they are the same turbo
except theres a spliiter on the s15 exhaust housing

wont make a differnce really..

[fliprayzin240sx]

Stock ecu i would need a tune correct?

Yup, you got an S14 engine that the ECU is set for 370cc. You go bigger injectors, the stock ECU wouldnt know what to do with it. You can either have a rom tune for the said ECU with better fuel/timing map for your setup, or get a PFC and be done with it.

[Monooxide]

they are the same turbo
except theres a spliiter on the s15 exhaust housing

wont make a differnce really..

There is a difference, beyond that.

[Teambadrun]

which is????

[Monooxide]

which is????

Inconel exhaust wheel as well.

I also want to believe the compressor wheel is slightly different as it supports more PSI and power. I know everyone says it's not, but I have my doubts.

Forum guys buy into all the hooha and jump onto rumors.

[Sileighty_85]

S15 exhaust housing is bigger

[$nicklefritz]

dudes right .. same difference... just newr and shinnier:cj:

[95KA-Turbo]

There is an EXTREMELY small difference between the turbos - not one big enough to consider putting an S15 turbo on a S14 SR20 an "upgrade".

You should return your S15 turbo and buy a GT2860 or GT2871 - something that would actually be an upgrade.

[Monooxide]

There is an EXTREMELY small difference between the turbos - not one big enough to consider putting an S15 turbo on a S14 SR20 an "upgrade".

You should return your S15 turbo and buy a GT2860 or GT2871 - something that would actually be an upgrade.

This I will agree with.

[WoolyS14DET]

Or a disco potato !!

[!Zar!]

Or a disco potato !!

OR not .

[xs042sx]

what modifications will i have to do to put a gt28 i have 800$ to play with.

[cc4usmc]

Keep saving.

[Teambadrun]

S15 exhaust housing is bigger
same size
same compressor wheel
same compressor housing
same trim/size exhaust wheel.
differnt exhaust housing( same, but has a little "splitter" casted into the housing to divide the exhaust gas flow from the wastegate outlet.
can someone show me further info they have an inconel shaft./exh wheel.??

[Monooxide]

same size
same compressor wheel
same compressor housing
same trim/size exhaust wheel.
differnt exhaust housing( same, but has a little "splitter" casted into the housing to divide the exhaust gas flow from the wastegate outlet.
can someone show me further info they have an inconel shaft./exh wheel.??

If this is true please explain to me how the max WHP I have ever seen on a S14 T28 is 284 WHP and for an S15 upwards of 310-320 WHP? The exhaust divider makes up the ground? Pfft.

[95KA-Turbo]

From everything I've read about the S15 turbo - even an article with a direct dyno comparison between the S14 and S15 turbos - it should make a few extra whp.....not 40whp. In the article I'm talking about when they put the S15 turbo on instead of the S14 (at the same PSI) they noticed a slightly change in the power curve and it made a few more whp I think. The conclusion of the article was pay 250-350 for a S14 turbo and don't ever pay 800 for a S15 turbo (I know they can be gotten for much less now).

I've never seen any dynographs of someone making 310+whp on a S15 turbo - I've seen 290ish on a S14 turbo but I don't have the graphs. I'd love to see some dynographs....I really wish I could find that old article I was reading because it was very informative and backed up everything it was saying.


Here's a thread off of here:

http://zilvia.net/f/tech-talk/108125-whats-difference-between-s14-s15-sr-turbos.html

[xs042sx]

just bought the s15 =] i need to get my car running

[Teambadrun]

same turbo.. just has the splitter :D

[Monooxide]

There was an article in a magazine in the last 6 months that measured the major dia. of multiple SR turbos and I could have swore that the S15 turbo was bigger.

[SILVIA_KIDs14.5]

im upgrading from a s14 t28 to a s15 turbo on my s14 blacktop i wanna know what injectors should i run with a hks actuator on 15 lbs ?????
i got a deal for u 400 bucks for spec R injectors which use the s15 turbo and a Tomei stage one racing Ecu if your interested will send pics this weekend if you want it
also the s15 turbo is bigger and better than the s14 t28 the s15 is the t28rs which you can boost up to 18 psi and 21psi my buddy had one on his s13 and the thing was riduclous lol let me know i also pm'd u

[Teambadrun]

iits the same turbo........ plain and simple!!!!!!!!!!!!!!!