Too much boost for stock internals?

[SMatyac]

I currently have my sr20det tuned at 25psi and its been that way for over a year, then my friend was saying that that's way too much boost for stock internals. I beat the piss out of my car but try not to hit the rev limiter much. Does this sound like too much for a stock motor??
I hit full boost at least once a day, and its still holding together, I do run 15w50 though. Should i just keep it how it is? or do you think it will blow soon?

Also, is 15w50 fine for a motor strung out this much? or should i run something different?
My only mods are Cams, Greddy intake, Apexi power FC, Cosworth headgasket and arp headstuds.

[jr_ss]

Stock turbo? If so you're over boosting by about 12psi... The T25 is only good to 13-14psi on a good day, if your lucky.

[SMatyac]

oh yeah, forgot about that.
No its a gt2871r with an .86 ar, 880cc injectors and a z32 maf

[KiLLeR2001]

No way is he running a stock T25 on 25psi for over a year. That thing would self-destruct in a week if not sooner.

I've always read that 400hp is the max power the SR bottom end can handle safely. So figure out how much horsepower you are creating.

[SMatyac]

I think it was around 370whp.
So i guess I'm fine for now?

And does my 15w50 sound fine for my motor?

[jr_ss]

I would say yes, you are fine, however, I'd probably dial it back to 20ish on the street, unless you're always running race fuel.

Killer- That was def a doh! moment, it honestly didn't even register...

[z2roll4life7]

Ive seen 19lbs on Stock t25(i was a newb then)but it drops to 14 by redline.
I learned my lesson when mine took a shit, I actually snapped the turbine shaft lol.
But that was after months of hard abuse tho. I got my fun out of her :)

To the OP you should be fine but only time will tell.

[godsmack]

just as long as the tune is good you'll be fine. if you've been doing it for a year and no problems then i'd say the tune is where it should be.

[godsmack]

was you're friend mad at you for beating him?

[SMatyac]

Well he has an r32 skyline so he always says my car is the bastard child of his car, so yeah I think he is mad my car is faster.

And cool, I guess I'll just keep running it till it blows, hopefully by then ill have the money for a Tomei stroker.

[KiLLeR2001]

I think it was around 370whp.
So i guess I'm fine for now?

And does my 15w50 sound fine for my motor?

For the hot summer months, I don't see a problem with 15w50, although winter is approaching, may want to go 10w30.

[fliprayzin240sx]

All about the tune, it wasnt uncommon for folks in Japan to hit 450-500 hp still on the stock bottom end.

[oni jake]

All about the tune, it wasnt uncommon for folks in Japan to hit 450-500 hp still on the stock bottom end.


Yes it was, because those who got over 400HP on stock internals didn't have a motor long enough to do something with it.

[jr_ss]

Yes it was, because those who got over 400HP on stock internals didn't have a motor long enough to do something with it.

Hmmm that's wierd, CodyAce has been running 400+ for quite sometime on a ROM tune... He beats the shit out of his car on the track(road race) too.

[godsmack]

Yes it was, because those who got over 400HP on stock internals didn't have a motor long enough to do something with it.

have you been around 450hp sr's that had proper tunes? guess not. it's all about the tune.

[Kingtal0n]

400 is too much for stock internal sr20det engine that have 80,000+ miles, IMHO. I dont care how well it is tuned... the clock is ticking.

http://i23.photobucket.com/albums/b378/draglarry/life-expectancy.jpg

X marks the spot for where the factory felt was maximum daily driver performance, reliable, capability.
Oh, she will do it. I see OEM internal 2jz hit 800 on a regular basis. For a while.

[oni jake]

have you been around 450hp sr's that had proper tunes? guess not. it's all about the tune.

No, because that shit doesn't exist. Like KingTalOn said, 400+ hp on stock internals is quite a lot. They might get one or two runs out of it, but they will quickly dial back the boost because 400 is the magical number on stock block SR motors.

JR_SS, CodyAce maybe running over 400 and could have had those number since the dawn of time, but CodyAce isn't the average person on the street cranking up the boost. Peaking over 400 is possible, but the reliability of the motor shoots downward at an incredible rate. Hence the original statement, don't be fooled into thinking this shit happens ALL the time. Japan also has different fuel than what is offered in the US.

Rule of thumb is >400hp on a SR motor requires upgrades in the rods and pistons. There are always exceptions, and CodyAce maybe one of them.

[fliprayzin240sx]

Yes it was, because those who got over 400HP on stock internals didn't have a motor long enough to do something with it.

Negative on that one, I knew guys who were running TD06-25Gs pushing 460-480hp that beat the living shit out their cars every day for over 4 yrs while I was there. Fresh rebuilt bottom end on one and the other was running his 2nd "I pulled the engine out of the junkyard" engine after 3 years. Only reason he blew the first one was his external wastegate line melted and the engine overboosted to 2.4 bar. Like I said, its all about the tune.

It wasnt unheard of for fresh stock bottom end SRs to hit close to 600hp before the stock HG start popping. Only reason they were failing was due to the head lifting, even with ARP head studs. This is fixable by upgrading to larger 12mm headstuds vs the stock 10mm.

[oni jake]

I'm gonna go ahead and say bullshit. Was stuff like that uncommon? Hell ya it was. Do you know why? Read above statement. I'm not arguing that you can't get more than 400hp out of a stock SR block, but it won't last long when your actually driving it. Proof of otherwise instead of exceptions, good thread though!

[fliprayzin240sx]

Well, you can say bullshit all you want...I've seen this myself after living in Japan for 4 yrs. If the tune is spot on, the only thing that kills these damn engine are oil issues. I can attest to that since thats what fucking killed my SR. Temp got too hot, oil thinned out...bubye engine. Was pushing over 500 on a GT3582R but I had Greddy 87mm pistons and Eagle Rods.

[oni jake]

so......... you didn't have a stock block?

Edit: I've also lived there for 4 years myself. Never seen 400 on a stock block. I heard claims here and there but never seen proof with my own eyes.

[fliprayzin240sx]

so......... you didn't have a stock block?

Edit: I've also lived there for 4 years myself. Never seen 400 on a stock block. I heard claims here and there but never seen proof with my own eyes.

Not me, I was running a bored out 87mm, stock sleeve S15 SR20 on a GT3582R on stock crank, eagle rods and Greddy pistons.

I had 2 buddies, one american and one Japanese that were both running Greddy TD06-25Gs. Both drag raced their cars every thurs, friday and sat nights regularly, with the ocassional drift/touge. The american was the one running a fresh OEM rebuilt bottom end but the head was fully built with Tomei goodies. Put down about 486whp.
The japanese guy that I knew was running a junked S14 bottom end, stock head with just 270* tomei cams/gears and RAS. He put down about 461 whp with the setup.

[jr_ss]

JR_SS, CodyAce maybe running over 400 and could have had those number since the dawn of time, but CodyAce isn't the average person on the street cranking up the boost.

That doesn't change the fact that he is in fact doing it... It doesn't make it an exception to the rule. It is proof that it is happening and has happened. A major part of it is in the tune, regardless of what you say. Carry on

[cotbu]

http://i18.photobucket.com/albums/b142/COTBU/life-expectancycopy_zps1c52d3b5.jpg

First of all you need to know the life expectancy of a car or engine!(U.S.12yr or 128,500 miles) I'm going to use the average of 15yrs and 200,000 miles
My car is a 1993 240sx. with over 250,000! Technically it has already exceeded it's life expectancy!
I swapped an s13 sr20 into my car at 100,000miles, The sr had 77000km (47,850 mi approx)
So the SR has already passed it's Japanese life expectancy, per Japanese EVL and whatnot!
So being an American, I turn the boost up 6mo after the swap, 13psi T25 approx 215hp S-AFC stock block!
6mo after that I upgraded to a gt28r 14psi romtuned un-dynoed till 2009 289hp (18psi 305hp mustang)
A 300hp car is what I was trying to build, accomplished on stock block! Now I'm hungry I wanted 400hp.
I achieved that sometime in 2011 stock block. So I know 400hp sr20's last at least a year, with over 150,000 miles on the engine. Of course it won't last forever, but it has already paid for itself and outlasted it life expectancy already. if it blows right now, I would have gotten every penny i put into it out of it!05-25-2011

It's a journey, it ends when it ends! Make sure you enjoyed the ride! And make the most motha fukin power and torque you can!
And yes I yada yada yada'd my sr20's life!

If anything that picture would probably work for clutches, not so much the engines!