boosting 17 lbs on stock motor

[chetos13]

i was told that you can boost 17 lbs safely on the stock sr motor if u just replace the head bolts and add a meatal headgasket. is this true?

[kognition]

On a stock SR? :bite:
I wouldn't do it.


i was told that you can boost 17 lbs safely on the stock sr motor if u just replace the head bolts and add a meatal headgasket. is this true?

[vespaman]

possible but it's all depend on the condition of the motor and turbo.
t25 won't make it for sure. t28 from s14 or s15 will do but not recomended.

don't do it unless you get the motor rebuild with supporting mods so you can make sure that everything is good

[drifter_for_life06]

if you have something other than a factory turbo you can do it, 95% of the time without a hitch

4-5local guys including myself have all done it for extended periods of time, then it comes time to crave more boost and power so a rebuild was inevitable

EDIT: I do recommend at least getting cams, intercooler and fuel upgrade(ie injectors, maf and pump.....i recommend a pump if you do anything other than completely stock..boost wise)

[Psycho 240 Freak]

The stock motor can handle a lot as long as you have supporting external mods ie: fuel pump, larger fuel injectors, Z32 maf, good tune and so on. I've pushed up to about 20 psi with a HKS GT2530 on my stock SR. When I say stock, I mean stock hg, stock head studs, and stock bottom end. The turbo eventually gave out, but my motor is still in perfect shape and now running with a GT2871R .64. My nephew uses a S15 turbo on his stock redtop and runs at 16 psi. The only supporting mod he has is a 255 lph fuel pump.

[drifter_for_life06]

^^^^your nephew has got to be maxing out his injectors and MAF

[GSXRJJordan]

^^^^your nephew has got to be maxing out his injectors and MAF

QFT - I start to lean out at the top of fourth at just 13psi on a S15-R T28, no cams, with a 255lph pump.

Steve Shadows runs stock bottom end on his GT3076 setup, pushing some 420rwhp on a Dyno Dynamics - so yeah, the stock bottom ends have the possibility to be good.

As was stated, once you do start making some power, you'll want more, and at the same time realize you're living on 'borrowed time' - these are used motors, after all - and prepare yourself for the inevitable rebuild.

[Psycho 240 Freak]

^^^^your nephew has got to be maxing out his injectors and MAF

Probably really close to being maxed out if not already. Then again, it's been about 7 or 8 years now and it's not like he beats on it constantly.

To the op. Even so, I'd wait until I had the supporting mods to do so.

[drifter_for_life06]

7-8 years with that is surprising he hasnt had issues...unless he runs a lower boost ALL the time and only occasionally raises it to that, but still i would think bad things would come from that...14psi on my T25 was iffy....and as gskrjjordan said...he leans out with 13psi on his S15 turbo

[S13 curtis]

stock bottom end is fine i have a buddy that is running 2 bars (29.4psi) on stock internals for a while and nothing happened. with acception to the supporting mods GT30r ,injectors, tune ,etc.

but a t25 on 17psi wont make it.
i wouldnt go past 15 pounds on a t25.

[wings_s13]

Dont do it! who ever told you that was stupid, you might be able to do it once or twice but it will mess up you motor. get it rebuilt for that, thats all ways the better way build it to take 20-25 lb of boost and only run 17 its just better that way

[cotbu]

There's so much I could say on this subject but It's all debatable so OP thread starter.
i was told that you can boost 17 lbs safely on the stock sr motor if u just replace the head bolts and add a meatal headgasket. is this true?
The stock engine can handle that boost... The head gasket and studs can also handle that level of boost. Boost is not the problem. The problem will come from the hot air being pumped into the engine. You can counter some of the affects with fuel tuning, and timing but at some point there will be detonation. The detonation may force you to rebuild the engine. Some people choose to install a head gasket and ARP head studs, this mod alone only gives you a bigger margin of error, not a bad thing. The detonation that would normally blow the gasket does'nt it now has to be more extreme. There are other factors like decking and resurfacing but that's not discussed a lot.

If you're going to take an engine apart might as well rebuild the entire engine.
If you're doing a leakdown with no intention of rebuilding, then why bother. There's always something.
I still say tuning above buying parts. but to each his/her own.

[vr4gasmtt]

I ran 18 psi on on my t25, it would usually spike to 22psi... yeah the turbo didn't last that long... more like 2 months before i started noticing problems.

[Psycho 240 Freak]

7-8 years with that is surprising he hasnt had issues...unless he runs a lower boost ALL the time and only occasionally raises it to that, but still i would think bad things would come from that...14psi on my T25 was iffy....and as gskrjjordan said...he leans out with 13psi on his S15 turbo

Yeah, I've warned him because this used to be my car before I sold it to him. He only pushes 16 psi on occasional runs. He dd the car at 12 psi. I'm surprised myself that the motor has lasted this long.

[!Zar!]

I ran 18 psi on on my t25, it would usually spike to 22psi... yeah the turbo didn't last that long... more like 2 months before i started noticing problems.

[email protected]

So pointless.

[drifter_for_life06]

I ran 18 psi on on my t25, it would usually spike to 22psi... yeah the turbo didn't last that long... more like 2 months before i started noticing problems.

you do know anything higher than 14-15psi on the t25 is out of its efficiency range...

[WA_Sileighty]

17psi=not enough info
doesn't mean anything now knowing what is actually producing said pressure.
thread fail

[drifter_for_life06]

17psi=not enough info
doesn't mean anything now knowing what is actually producing said pressure.
thread fail
all said turbo's at 17psi he'd be fine......stock bottom ends have seen 500+ which is more than 17psi for just about any common turbo setup on the SR........you fail

[garbury]

used to run 15 psi on stock t25, stock fuel for 1.5 years...no issue at all and when i installed the wideband, my afrs were in the 10s-low 11s so i wasn't runing lean.

Now i run a 2871r .86, 850cc, z32 maf, CG tune (arizona tuners) @ 18 psi daily for 1.5 years and no issues at all. Motor is 100% stock except for RAS. BTW I hammer my engine once warm and definately get use from it, though its hard to tach out in the streets once you have power...at least if you like your license

[mystacarlo]

i run 15psi on my s14motor with the stock t28 all day long.

supports i have are z32maf, walbro 255, safc2 and brian crower 264cams. stock injectors, my fuel pressure is 43psi on idle

on my wideband, thru majority of the powerband, i run 11.5-11.8 bein the highest, then at 7k where i shift at, my ratio is down in the 10's. ive been runnin like this for bout 6 months so far.

compression is still 145-150 across the board.

i let it dip into the 10's to help save the motor, to keep shits cool. i need an egt so i can monitor my internal temps

[opponheimer]

i ran 21lb daily on my SR... whats the big deal? take care of it... dont ever let it overheat.

[slider2828]

he can do whatever he wants.... its a dumb question.... you can do anything you want to a motor, just as long as its tuned right...

[Z U L8R]

this is the type of crap i hear everyday at the shop. "I heard on the forums, from the forum gods that i can push 17psi, SO IT MUST BE TRUE"

i'd say you can push 30+psi for a second or two on a stock sr20 before something funny happens so why stop at a mesely 17, don't be a puss :D

my recommendation to you, don't half ass your car, don't buy crappy parts and expect greatness or expect it to last very long, don't turn the boost up without doing it on a dyno with the proper supporting mods and something to tune it with, don't stand up in a canoe, don't eat yellow snow, and don't push the limits on your engine unless you have the money to build it or buy another one.

Dave

[garbury]

this is the type of crap i hear everyday at the shop. "I heard on the forums, from the forum gods that i can push 17psi, SO IT MUST BE TRUE"

i'd say you can push 30+psi for a second or two on a stock sr20 before something funny happens so why stop at a mesely 17, don't be a puss :D

my recommendation to you, don't half ass your car, don't buy crappy parts and expect greatness or expect it to last very long, don't turn the boost up without doing it on a dyno with the proper supporting mods and something to tune it with, don't stand up in a canoe, don't eat yellow snow, and don't push the limits on your engine unless you have the money to build it or buy another one.

Dave

Truth. though i push the motor, im definately particular on maintenance and avoid purchasing crappy parts. If you back your stock motor well, it could last very long. If you back your stock motor well, it could blow the first time you get on it. A mechanical system like an engine is not gonna give the same result for the same given input, there are simply too many variables. If you want to make power, make money also, because it will cost you eventually in either good parts or repair and then good parts.

[ExtremeD]

i ran 17 pounds with a 60-1 and made 333hp with no prob for years. i have even spiked 30psi befor, only a couple of times on accident tho. motor is complety stock. i have a fuel pump, fmic and a afc neo. still runs to this day hella strong. they can handle alot as long as you have the fuel to back it up.

[Banegraphix]

Do it right or do it twice

[S13 curtis]

i ran 17 pounds with a 60-1 and made 333hp with no prob for years. i have even spiked 30psi befor, only a couple of times on accident tho. motor is complety stock. i have a fuel pump, fmic and a afc neo. still runs to this day hella strong. they can handle alot as long as you have the fuel to back it up.

wow. those are extremely low #'s for a 60-1 @17 psi.:mepoke:

you could do that with a GT28RS at the same boost.



But to the guy that ran 18 pounds on a stock t25 its not worth the extra 3-4whp since its out of the efficentcy range, it starts to make less power per psi once out of the efficency range and more heat.

ex: 250whp @ 15 psi on a T25
[email protected] psi not worth all the hot air and damage on a t25.

[drifter_for_life06]

^^^ probably that low cuz according to him he had stock injectors and MAF so he wasnt running near efficient enough to make good numbers

[smelly240]

boost doesnt mean anything... its not the pressure that matters. It's the output of the engine.

17psi on a t28 - is like 300hp tops... on a good day. 17psi on a 35r is a lot more (400 area).

thats a correct # for a stock cams motor with a 60-1.

[Teambadrun]

wow. those are extremely low #'s for a 60-1 @17 psi.:mepoke:

you could do that with a GT28RS at the same boost.



But to the guy that ran 18 pounds on a stock t25 its not worth the extra 3-4whp since its out of the efficentcy range, it starts to make less power per psi once out of the efficency range and more heat.

ex: 250whp @ 15 psi on a T25
[email protected] psi not worth all the hot air and damage on a t25.
250rwhp??? from a T25G!!?? bahahha DREAMING!!!

[Teambadrun]

you can boost to whatever you like
but don't go more then 15-16 with a standard turbo
t28 also.. don't go further otherwise you will just have stupidly high intake temps

[smelly240]

people have run 18psi daily on t28's - its not great - but if u have th efuel to support it and its a track car - you'll be fine/

or u can listen to mr knowitall - even tho hes a moron.

[Teambadrun]

people have run 18psi daily on t28's - its not great - but if u have th efuel to support it and its a track car - you'll be fine/

or u can listen to mr knowitall - even tho hes a moron.


i think hed rather be safe then sorry

[S13 curtis]

people have run 18psi daily on t28's - its not great - but if u have th efuel to support it and its a track car - you'll be fine/

or u can listen to mr knowitall - even tho hes a moron.

strongly agreed.
i have buddys running 18 psi on a s15 t28 also.

[S13 curtis]

250rwhp??? from a T25G!!?? bahahha DREAMING!!!

lol bro are you serious?!?!?

and that was an example.

there are a bunch of SR's and KA's that pushed over 250 whp with a t25 it is possiable with supporting mods.

[boostlee]

Fuel quality is almost #1 reason to kill, as well as intake temps. but 17 is pushing the limit.

[Z U L8R]

why push it? if you get pwned by a car at 14psi, you'll still get beat by the car at 17psi...... and if it matters to you that much to not lose, then build your shit right and don't try to cut corners and you'll have a good set up that will last you a long time.

or you can keep pushing it to see how much it'll handle before it'll blow....and that's exactly what it'll do....it'll blow, just don't be surprised.

99% of the motors that blow up before they make over 300 hp is STUPID ASS SHIT like this. People half assing their builds, using cheap manual boost controllers and listening to idiots on the forums who had a friend who did this and didn't have a problem so it must be written in stone and 100% an absolute truth.

this is a sig worthy quote

"if you can't afford to do it right, find another hobby"

Dave

[smelly240]

lol bro are you serious?!?!?

and that was an example.

there are a bunch of SR's and KA's that pushed over 250 whp with a t25 it is possiable with supporting mods.

I wouldnt worry about what that guy has to say - he's known to be a scammer on many forums, and just shoots his mouth off. t25's are able to make 250 - and t28's can make 300... its not like every t28 makes 300 - but it happens, regardless of what people think.

i wouldnt recommend anyone crank their boost up without mods that support it, and pushing a t25 to 18psi is stupid.

[clark]

i was told that you can boost 17 lbs safely on the stock sr motor if u just replace the head bolts and add a meatal headgasket. is this true?

your sr is no longer stock if you upgrade to stronger head studs and a MHG. :keke:

but seriously....rock your T25 till it blows and in the mean time save for a better turbo/better fuel, but for the time being, beat the piss out of yoru current T25, if you want to boost that high, go ahead.:2c:

[ixfxi]

can i boost 30lbs if i use 87 octane???? i am not sure if its safe or not.

someone pls help, thnx!!!!

[drifter_for_life06]

can i boost 30lbs if i use 87 octane???? i am not sure if its safe or not.

someone pls help, thnx!!!!

id say no, but according to everyone else if you got the right supporting mods....go for it:keke:

[Teambadrun]

if your ecu is standard and not remapped dont run more then 12-13psi
anymore you will start to lean out pretty badd...

[ExtremeD]

wow. those are extremely low #'s for a 60-1 @17 psi.:mepoke:

you could do that with a GT28RS at the same boost.



But to the guy that ran 18 pounds on a stock t25 its not worth the extra 3-4whp since its out of the efficentcy range, it starts to make less power per psi once out of the efficency range and more heat.

ex: 250whp @ 15 psi on a T25
[email protected] psi not worth all the hot air and damage on a t25.

333hp with stock maf, stock cams, stock motor, the only thing i have is 550cc and the neo. 333 is not bad considering what i have.

[kalypso123]

we should be talking about lbs per minute... not psi

[Teambadrun]

333hp with stock maf, stock cams, stock motor, the only thing i have is 550cc and the neo. 333 is not bad considering what i have.
the stock Afm is only good for 280rwhp or so

can't see much in the window past that... guessing i take it?

[smelly240]

boost doesnt mean anything... its not the pressure that matters. It's the output of the engine.


we should be talking about lbs per minute... not psi

yeeaahhhh.. no one cares - they all want "boost". :P


The stock maf "maxes out" at 280 - that doesnt mean the HP cant go over that - just means its gonna read max load (TP) beyond that - as long as he has that AFC turning the maf voltage back to account for the injectors being overs stock - it will go beyond 280 since the maf can go beyond 5V - its the ecu that cannot do past 5v. Soooooo... the afc is reducing the output voltage going to the ecu - making it possible for him to make more power despite the maf being stock.
Now whats happening with his timing on the stock computer is NOT SAFE! The AFC pulls maf voltage from the signal to tell the ecu to shoot less fuel by telling it theres less load (when its in fact the opposite) - and the ecu give you timing as if u were at much less load as well. Meaning... your shits timing is jacked and i would get it tuned properly asap.

afc=poopmachine

[drifter_for_life06]

yeeaahhhh.. no one cares - they all want "boost". :P

afc=poopmachine

:werd: afc is total crap

[Z U L8R]

safc is all you need if ur still running a t25......lemme rephrase the all you need.....cause they'll be out there street tuning on the ass dyno of what "feels" right. lol

re-read my other 2 posts in this thread

Dave