t28 turbo (s14-s15)

[mxd]

need some info on this,a guy is selling me is t28 bb from a s14and i want to know if its the same a s s15 t28same amount of hp

also how much $ is to rebuild my t25 and how much hp will i get!thanks everybody!

[Onizuka]

they are not the same, s15 is Ball Bearing and s14 is not. s15 t28 is also made of better materials...good for about 310-320 ive heard.

[Structure240sx]

heavy throttle's website says that the s14 t28 is ball bearing and they have the same compressor.

[godspeed]

actually it is a ball bearing turbo, the s15 has some little stuff that makes it a little better

[chezina]

The little things that make the S15 turbo better are different wastegate design and different(other material) turbine wheel on the exhaust side, as far as i know.The max. output of a SR t25 should be somewhere around 250-260hp and rebuilts usally start around 300$(over here in Europe, maybe it's a little more or less in the US) depending on the condition of the turbo.

[hokiruu]

need some info on this,a guy is selling me is t28 bb from a s14and i want to know if its the same a s s15 t28same amount of hp

also how much $ is to rebuild my t25 and how much hp will i get!thanks everybody!

NO NO NO! it goes like this:S13-t25 journal bearingS14-t25 ball bearingS15-t28 ball bearing.... really. So I'd say say stay away from buying an "S14 bb t28" because he doesn't know WTF he's talking about! Think about it: If the s14 came with a t28bb why would all sorts of people in Japan with BOTH s13 and s14 be upgrading to the s15bb if it was the same one on the s14... Both the s14 and s15 have VTC, and if they have the same displacement and they came with the same turbo what would be the difference? Sure, a lil something here and there, but that's not enought for Nissan to justify a new motor designation. SO, the s14 is not a t28! Rebuilding your t25 will range from as low as $300 to $900 depending on what specs you want to rebuild to. The most common options are:

T28BIG T28Big T28 Killer These range from about 280, 350hp, 380ish respectively, depending on other factors.Then there's an interesting area of hybrid t28/T3 turbos that supposedly bolt on too! But I dunno too much about that yet. If you do, please tell me! Another thing I don't know and would like to is what kind of fuel management and other engine upgrades are necessary with each one? I am guessing that the BIG T28 Killer is the one that will need a metal headgasket, 550cc injectors, high flow pump (you should have one anyway), RAS, and valvespring upgrade:thinker

[themadscientist]

NO NO NO! it goes like this:S13-t25 journal bearingS14-t25 ball bearingS15-t28 ball bearing.... really. So I'd say say stay away from buying an "S14 bb t28" because he doesn't know WTF he's talking about! Think about it: If the s14 came with a t28bb why would all sorts of people in Japan with BOTH s13 and s14 be upgrading to the s15bb if it was the same one on the s14... Both the s14 and s15 have VTC, and if they have the same displacement and they came with the same turbo what would be the difference? Sure, a lil something here and there, but that's not enought for Nissan to justify a new motor designation. SO, the s14 is not a t28!

Ah the internet, what a fountain of mis-information.

The S14 turbo is ball bearing and it is a T28 frame just like the S15, the S15 has internal differences that I am not certain about that makes it SLIGHTLY superior, likely bigger or better designed wheels or improved materials.

People are upgrading to the S15 because it is a little bit better and if it costs about the same why would someone get the inferior model?

:rolleyes

[mxd]

but do they have the same horse power?????????

[godspeed]

this is from heavy throttleTurbo specs:

Compressor: T-28, 60 trim 60 mm BCI-1 compressor in T-04B housing

Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.

Center Section: Ball Bearing

you can just go there and click on the engine part of there website and it tells you the specs of everything...and also i have seen the s14 turbo here in japan...its a t28....for the last time.

[hokiruu]

Ah the internet, what a fountain of mis-information.

The S14 turbo is ball bearing and it is a T28 frame just like the S15, the S15 has internal differences that I am not certain about that makes it SLIGHTLY superior, likely bigger or better designed wheels or improved materials.

People are upgrading to the S15 because it is a little bit better and if it costs about the same why would someone get the inferior model?

:rolleyes

Not the S15 MOTOR, the S15 TURBOCHARGER! That's what people are doing with s14s.

[hokiruu]

OK, I MIGHT BE WRONG. I HAVE HEARD BOTH TO BE TRUE. I WENT WITH WHAT MANY DIFFERENT SOURCES TOLD ME, AND THAT WAS WHAT THE MAJORITY SAID. SORRY. I DO KNOW THAT THE S15 USES 444CC INJECTORS, so maybe its manages air and fuel a little better.

[themadscientist]

hate to do it but you are wrong again, the S15 has 480cc injectors. The GT-R and Gti-R have 444cc injectors.

[themadscientist]

Not the S15 MOTOR, the S15 TURBOCHARGER! That's what people are doing with s14s.

I meant the turbo.

[hokiruu]

OK! I have been severely misinformed by sources both online and in print! Now I'm gonna just go suck on a 150 shot to blow my misinfomed self to pieces... I am dumb and gullable or something. Sorry

[themadscientist]

no gullible is the guy that beleived me when I said that bright colored cars are faster.:slap

[Onizuka]

Light colored cars ARE faster. Its a proven fact. I read it in a book. My science teacher told me. Thats why ferrari's are red. thats why my car is soooooooo slow. because its painted black.

[Cyberkreig]

you are both grossly mis-informed. NEON colored cars are faster. Especialy lime green and that hideous yellow (not JUN yellow, you know the yellow I mean)

[Movingviolation240]

the S15 turbo is the exact same thing, only 2 differences are an inconel turbine wheel and a divider on the wastegate outlet. Same turbine housings, same compressor housing, and all Jap spec S14's were ballbearing, the euro ones were still journal bearings.

I have heard rumors of guys making 300rwhp on a T28, but I'd guestimate that 280rwhp would be more like it with proper tunning and fuel.

You have to keep in mind that the stock S13 or S14 370cc injectors are WAY past flat out at that point, and the stock MAF is also way over taxed. I.E. try it without the proper upgrades and you get to rebuild your motor.

S15 6speed's used 480cc injectors the automatics were still 370.

PaulOrlando, FL

[hokiruu]

the S15 turbo is the exact same thing, only 2 differences are an inconel turbine wheel and a divider on the wastegate outlet. Same turbine housings, same compressor housing, and all Jap spec S14's were ballbearing, the euro ones were still journal bearings.

I have heard rumors of guys making 300rwhp on a T28, but I'd guestimate that 280rwhp would be more like it with proper tunning and fuel.

You have to keep in mind that the stock S13 or S14 370cc injectors are WAY past flat out at that point, and the stock MAF is also way over taxed. I.E. try it without the proper upgrades and you get to rebuild your motor.

S15 6speed's used 480cc injectors the automatics were still 370.

PaulOrlando, FL

Ok. Thanks for that info Movingviolation. I am currently still deciding whether to buy an s13 or s14 motor for my s14 chassis. So it seems that alot of people are saying that I could buy an s13 and add t28 bb turbo, 550 cc injectors, Z32 MAFS and be well beyond the stock s14 output, huh? If so, by how much, because it will cost thousands more (of course both would have the same basic mods.) If I do that will it also be important to get a metal head gasket, RAS, and valve springs? If so, it may to a real expensive way to "spend the money I save on an s13" because I was quoted a s13 clip for $2k and s14 for $2.5k. Yes, I have a friendly and generous connection for clips, so either one will be in good condition.

[Movingviolation240]

Get the S14 clip, and the RAS. You don't need injectors if your staying with the stock turbo, but a Z32 MAF and a little extra fuel pressure couldn't hurt.

That's my advise (and that's also what I'm installing into my S14)

PaulOrlando, FL

[hokiruu]

OK. Sounds good to me. I have the opportunity to buy a Tomei s14 fuel pump. It will be $200 more that a Walbro for $120. Of course Tomei is the best and is made specifically for my car. I don't really know about Walbro, but they semm popular. However, I don't like the idea of jimmy rigging a fuel pump setup, as I will be doing the swap myself. I dont want o have to modify my tank or anything. Do you think that Tomei is worth it (guaranteed fitment, all necessary parts, +$200) or is the Walbro like the sleeper pump that will do/fit as well for alot less.

[SR180SX]

Ok. Thanks for that info Movingviolation. I am currently still deciding whether to buy an s13 or s14 motor for my s14 chassis. So it seems that alot of people are saying that I could buy an s13 and add t28 bb turbo, 550 cc injectors, Z32 MAFS and be well beyond the stock s14 output, huh? If so, by how much, because it will cost thousands more (of course both would have the same basic mods.) If I do that will it also be important to get a metal head gasket, RAS, and valve springs? If so, it may to a real expensive way to "spend the money I save on an s13" because I was quoted a s13 clip for $2k and s14 for $2.5k. Yes, I have a friendly and generous connection for clips, so either one will be in good condition.

Get the S14 for S14! $500 different and you get T28 and newer engine 95+.

[hokiruu]

SR 180sx: I now have a question for you... (or anybody else). Blitz seems to be one of the only companies that makes a full BOV kit for the s14, meaning with a hot pipe replacement. I want to use an HKS BOV, because I like the whistle it makes, the Blitz sounds cool but just goes "pshht). HKS does not make a hot pipe replacement kit for s14, just s13. They do make flanges in aluminum and steel. However I do not have access to a mandrel bender nor can I have aluminum welded around here. Maybe I should just get the BLitz, or is there an easy way to have the s13 HKS kit work on s14, the hot pipes are different.

[SR180SX]

Acutally my still an factory hot pipe, I think it will work with S14 as well,

[Onizuka]

sr180sx, do you have any low end power problems with the GT Spec Exaust?

sorry for the threadjack!

[SR180SX]

Lower end power is okay, but little bit too loud if silencer is off, lucky I don't drive this car daily

[mxd]

hey sr180 do you have some pics of the 300zx light conversion can you email me some thanks [email protected]

[hokiruu]

Acutally my still an factory hot pipe, I think it will work with S14 as well,

So the stock hotpipe is steel? Do you know what diameter? HKS sells the BOV flanges in 60 and 65mm I think.

[sil8tydrift]

what would be the best gear oil to use on a Sr20det trany..75-90....or 80-140?

[hokiruu]

what would be the best gear oil to use on a Sr20det trany..75-90....or 80-140?

I am bad about this too, as we can see by my above post, but these are seriously off topic. BOV, transmission fluid... Sorry