S14 T28 boost on stock internals

[isimon91]

Wondering what a safe amount of boost would be for a SR with the following specs:

Blacktop head, redtop block, new-ish S14 T28, HKS 264/264 cams, 550cc denzo injectors

Car will be running a ROM tune by Touge Factory, wondering what I should have them tune it at to keep my engine internals safe, and not to overboost the turbo.

Thanks

[Om1kron]

30 pounds is the minimum amount I would set it too if I didn't do a search for this constantly repeated subject that's probably been covered over the last 10 years.

Just saying.

If you don't want to search, then yeah, 30 pounds bro.

think big.

[nismoracingsx]

How did you throw these parts at your car w/o doing research on safe limits first? This is like leaping off a bridge w/o knowing how long your bungie cord is..

Quoted but I won't say from where ; )

Safe Limits of Stock SR20DET
Many people ask what power levels a stock block SR20 can handle. The internals have been known to support 400 whp reliably. However, that is dependent on your fuel management. Proper supporting mods must be done to the fuel system to support this number, or you will melt pistons. The pistons are the first part of the motor to fail internally. They tend to overheat and either burn holes through them, or their ringlands crack and fall apart.

Reports of rod failure have been practically non-existant for 2 reasons. Most people upgrade their rods when they rebuild, so it's rare to find someone stress testing rods with an aftermarket piston. The other reason is that SR rods are beefy, and short. Shorter rods don't have the same leverage of force placed on them as a longer rod, and are less likely to bend. The rod bolts Nissan uses, are of good quality, and have yet to show fatigue at high RPM leading to spun bearings.

The crank has yet to be proven as a week point, and it's rare to see someone crack or snap one due to power output

[S13 curtis]

i wouldnt boost higher then 18-20psi with an s15 T28.

[fliprayzin240sx]

1 bar...nuff said...

PS: Why the fuck are you running cams on a stock T28 turbo?!?!

[buentellomma]

i learned my lesson a few years ago about over boosting with stock turbo and injectors, melted pistons.... man i would ditch that t28 and go with a disco potato, with the t28 its going to be more trouble to run over 1bar than its worth. save your money and go with a bigger turbo if your looking to run a lot of boost

[twin240s]

yeah and if you r gonna get a new turbo. then you can sell me your t28. for real. if you do pm me or send me an email. at [email protected] better yet i have a t3/to4e ebay turbo in ok condition that i will trade you if you want.

[isimon91]

i learned my lesson a few years ago about over boosting with stock turbo and injectors, melted pistons.... man i would ditch that t28 and go with a disco potato, with the t28 its going to be more trouble to run over 1bar than its worth. save your money and go with a bigger turbo if your looking to run a lot of boost

How much boost were you running that you melted your pistons?

1 bar...nuff said...

PS: Why the fuck are you running cams on a stock T28 turbo?!?!

Yeah 1bar would probably be ideal.. motor was cammed before I even bought it. I don't really see a downside to it except gas wasted.. and I didn't build this car for fuel economy.. (550cc injectors).

30 pounds is the minimum amount I would set it too if I didn't do a search for this constantly repeated subject that's probably been covered over the last 10 years.

Just saying.

If you don't want to search, then yeah, 30 pounds bro.

think big.

THANX BROH.

edit: I'd rather not be banned, than have my word in here.

yeah and if you r gonna get a new turbo. then you can sell me your t28. for real. if you do pm me or send me an email. at [email protected] better yet i have a t3/to4e ebay turbo in ok condition that i will trade you if you want.

No.

I just downgraded from a t3/t4 .57trim.

GLWS though dude.

[Prok0]

Run the car at 1 bar, occasionally knock it up to 18psi, and enjoy it.

A small or medium cam setup like you have on your car now paired with the T28 will be a real fun street car at around 1 bar.

Disco potato is fucking stupid, if you got a t28 ride out.

I have an S14 turbo on my car, 740cc injectors/Z32 maf/rom tune, 264 cams, I run 1 bar all day and its fun as fuck on the streets. You'll probably make around 270whp and have instant boost, and on a street car with the proper tire thats plenty fast..

And for what its worth, the exact same turbo setup i have on my car now (S14 T28, divided o2 housing, some shit megan manifold, and a 3'' dp) made 350 something whp at 16psi on a stock bottom end SR, built head, greddy intake mani with q45 tb, running an AEM EMS that was tuned very very well..

Honestly though, s14/15 turbo is pretty much an ideal street/auto-x/small drift track turbo, no lag and good power provided your shits not fucked up and your tune is decent.

[S13 curtis]

Run the car at 1 bar, occasionally knock it up to 18psi, and enjoy it.

A small or medium cam setup like you have on your car now paired with the T28 will be a real fun street car at around 1 bar.

Disco potato is fucking stupid, if you got a t28 ride out.

I have an S14 turbo on my car, 740cc injectors/Z32 maf/rom tune, 264 cams, I run 1 bar all day and its fun as fuck on the streets. You'll probably make around 270whp and have instant boost, and on a street car with the proper tire thats plenty fast..

And for what its worth, the exact same turbo setup i have on my car now (S14 T28, divided o2 housing, some shit megan manifold, and a 3'' dp) made 350 something whp at 16psi on a stock bottom end SR, built head, greddy intake mani with q45 tb, running an AEM EMS that was tuned very very well..

Honestly though, s14/15 turbo is pretty much an ideal street/auto-x/small drift track turbo, no lag and good power provided your shits not fucked up and your tune is decent.

I def wouldnt go from a S15 turbo to a Disco, you can make pretty much the same power with the S15 turbo within 20 whp.

So you made 350+whp with a S14 turbo @ 16lbs?
sounds kinda high to me unless your running E-85 or a 75 kit.

[greenzenki86]

yeeeeeeeeah that guys 350whp claim on a stock t28 is a bit high but hey, some people do have some miracle stories, but back to the question, stock t28 id say 1 bar is good, you never wanna have a turbo maxed out all the time, and cams arent really necessary for your set up, another thing to keep in mind is that there isnt really a "safe" number when talking about how much you want to boost, its what your motor will take, get a wideband o2, knock sensor, etc and get it legitimately tuned so you KNOW that its actually not running itself on the edge. hoped that cleared up a bit for you bro.

[Options13]

im running a somewhat similar setup

s14 sr20det bottom end, with redtop sr20det head
toda racing 264 cams
480cc injectors
enthalpy tune
z32 maf

i'm gonna keep my boost at around 12-14psi

[confuzed240]

im running a somewhat similar setup

s14 sr20det bottom end, with redtop sr20det head
toda racing 264 cams
480cc injectors
enthalpy tune
z32 maf

i'm gonna keep my boost at around 12-14psi

Your turbo would help the comparison.

[Z33dori]

and power numbers?

I do know this:
s13 red top
s14 t28 15psi
stock everthing else
FMIC
full 3" turbo back
megan mani and eblow

260whp-280ftlbs