25 Psi

[DSMinn0vati0ns]

Hey everyone, quick question.. I was wondering if it would be safe/ok to run 25-27 psi with my RS49T on my car with stock internals but with ARP headstuds.. Would it be possible?!

Thanks Matt,

 

[Defiant]

Nope.

 

[Slippi84]

While defiant is much more straight out i disagree. It depends on how much knock your seeing and how much power your makin. If your tune is crappy and your only makin 350-400whp with that much boost and not seeing knock then yeah you can run it at that level. What you should do it get a real good tune and go for like 22 psi. Knock and Hp will kill your engine not boost. To much boost will just toast your turbo.

 

[ddavisaf]

No it's not possible. Not with 550cc injectors.

 

[Slippi84]

He wasn't askin is it possible to run it with 550cc injectors he said is it possible to run it on stock internals. How do you know he's not planning on goig out and pickin up some 750's before he runs 25 psi.

 

[ddavisaf]

Good point.

 

[DSMinn0vati0ns]

thanks everyone.. and yes i was planning on going with bigger injectors

 

[Defiant]

Have a good time with those six weeks.....

 

[Thomas91169]

i believe 25psi is very do-able with the head studs. hell i know people in the sac-dsm forums running that on stock head gasket and studs with no problems. but then again they are very conservative and only beat on the car while racing, and baby it everywhere else.

as long as youre tuned well(no knock) and all the maintenance is up to par, i think its very do-able. though if it were me, id run 20psi daily and just do 25psi at the track and use 100+ octane(or race fuel) just to be on the safe side.

 

[v2ner]

it's possible only if you do atleast 560cc injectors on at least 110 octane. i'm doin 27 psi w/ 560cc on 110 octane. i have head studs and camshafts. all this w/ an evo III. i've been runnin safe for a year now.

 

[project_tsi]

I run 25 psi daily w/ my 50 trim. I run 650's w/ all other sup. mods. I tune using Link and run 93 octane. The only time I get knock is about 5 counts right at about 6500, and that will soon be gone once Link is tuned to 100%. So it is do-able.

 

[Slippi84]

While it's posible I DO NOT agree with running with running 25psi on the street for dd. I mean with a 50 trim at 25 psi unless you race corvettes on a daily basis it's not needed. SImple 20 psi dd and 25 or w/e you can run before you see knock is cool. 25psi daily is just to much everyday stress. Yes I know you'll probably say something like you don't get into boost all the time but when you do that 25 psi is gonna be there. Longevity is just as important as performance. a car that runs 11's for a week isn't as gooas a car that runs 12's for a year.

 

[project_tsi]

While it's posible I DO NOT agree with running with running 25psi on the street for dd. I mean with a 50 trim at 25 psi unless you race corvettes on a daily basis it's not needed. SImple 20 psi dd and 25 or w/e you can run before you see knock is cool. 25psi daily is just to much everyday stress. Yes I know you'll probably say something like you don't get into boost all the time but when you do that 25 psi is gonna be there. Longevity is just as important as performance. a car that runs 11's for a week isn't as gooas a car that runs 12's for a year.

Well I have my opinions and you have your's. I'll drive MY car as I see fit.

No, Im not worried about longevity at all, and I'm not worried about it. At about 22 psi, my turbo is just waking up, and I didn't spend the money on a nice turbo for me to run it like I could a 16G. I have the supporting mods, and like I said before, Its getting tuned perfect w/ Link. Im not going to be knocking, or pulling timing. As it is now, I have a nice power curve, just have to work out a few bugs.

And basically what your trying to tell me is BS. Your trying to make it seem that 20 psi is fine, whereas 25 psi will kill my car in a month? BS... Sure, if I was knocking out of the ass at 25 psi, then surely, I would turn down the boost, but I'm not, so I won't.

 

[v2ner]

from my experience, i think it's pretty safe if you have the tuning down. it would be safer though, to have a ML head gasket. i've been runnin for a little over a year now and the only problem i had was a busted cotter pin off my wastgate arm. only 18 cents to replace it.

 

[v2ner]

BTW, in a couple of days i'll be runnin a 61 on 27psi as my DD and i drive at least 50 miles a day.

 

[project_tsi]

BTW, in a couple of days i'll be runnin a 61 on 27psi as my DD and i drive at least 50 miles a day.

Sweet. Just tune her right.

Oh BTW, I do have a Cometic HG, and APR studs. I probly wouldn't run that 25 psi on stock head parts.

 

[Slippi84]

That's all well and good but i wasn't talkin to you. This is a thread for the guy who posted it. I was tellin him I don't recomend it. You can run w/e you want. He asked can he run it safely i said yes with the right tuning mods on a stock block with studs from arp yes he can run 25psi with his turbo. You run 25 psi daily that's your thing. I'm not saying it's wrong or w/e just not for most ppl. This guys is not at the point where he feels safe doing that yet obviously so why come on here and say run 25psi daily. I was not speakin literaly it's called an analogy and if your not worried about longevity why not run 28psi daily on pump so i can read the next thread "how to fix the efects of detonation"

 

[99gst_racer]

Hey everyone, quick question.. I was wondering if it would be safe/ok to run 25-27 psi with my RS49T on my car with stock internals but with ARP headstuds.. Would it be possible?!

Thanks Matt,

Is it possible? Yes, of course it is. But, to do it safely, it will require all of the supporting modifications as well as a good, knock-free tune.

Chances are, you will have trouble with knock at 27psi on pump gas. So you would probably need to use some sort of methanol injection kit or run race gas. But as long as you aren't knocking, I feel the engine will be fine. Worse case senerio: You blow your fuse (head gasket).

Dont pick a boost number and try to run it. That's not how you do it. Set your boost to whatever your car runs best at. For example: If you are at 22 psi w/ no knock and a good timing curve, then that is much better than running 37 psi with 12 counts of knock and timing at 14 at the top 3rd. More boost does not always = better.

if your not worried about longevity why not run 28psi daily on pump so i can read the next thread "how to fix the efects of detonation"

WTF Obviously, Project_tsi is smart enough to run a boost amount that doesnt create knock. That's why he doesnt turn it up. More boost doesnt always = more power. But a better tune does = more power and it sounds like he has a pretty good/safe tune at 25 psi.

You can fix detonation by turning the boost down. If he allready knows that, then why would he turn it up to 28 psi and knock? You make no sense.

 

[out there]

for reference, a local shop guy ran 11.2 on a stock block with a 50trim at 26psi using arp headstuds, 550cc's (maybe 650s?), race fuel, act2600, big fmic and a couple other things... i don't think he had a forrester intake or hks cams yet

 

[Slippi84]

WTF Obviously, Project_tsi is smart enough to run a boost amount that doesnt create knock. That's why he doesnt turn it up. More boost doesnt always = more power. But a better tune does = more power and it sounds like he has a pretty good/safe tune at 25 psi.

You can fix detonation by turning the boost down. If he allready knows that, then why would he turn it up to 28 psi and knock? You make no sense.

I was trying to make a point and by the way that was sarcasim. Just cause you can run a car safely on a set boost and tune does not make it smart or even preferable for the street. Ara Arselania runs 30+psi on his setup that runs 6's. It is 100% safe..... for the 5-6 runs his engine last. If a engine lasted as long at 400 hp as it did with 200hp why do you think so many of us tuners have to rebuild all the time while jane next door with her stocker has like 150k on the original motor and is still runnin. It's called your DD for a reason. You guys are getting the wrong idea anyway what project tsi is irrelevant the advice we give to a fellow dsm guy who is learning is.

 

[Slippi84]

Def a smart move and i'm not going at it just trying to make sure no one tells you something that's gonna put your dsm at risk man. Just lookin out for you. I'm done though if anyone wants to tell me their OPINION knock yourself out but keep it off the thread PM me.