Max safe boost? [Merged 10-6]

[Turbolaser]

Is it safe to do the boost contol solenoid mod on a stock 1G?

 

[90blacktsiawd]

Not a problem Dustin.

 

[98evoIIIpwr]

NO!!!!!!!!!!!!!!!

This just isn't true. I'm currently running 22 psi on a DAILY basis out of my 50 trim. It's not until upwards of 25 psi that you may have to start worrying about the head studs stretching. Even then, there is no exact number they will stretch at. It also isn't very likely your going to turn the boost up just once and have them suddenly stretch on you.

Another thing, the stock mitsu composite headgasket has proven itself time and time again to handle alot of boost. There are several members here that are running 30+ psi with a stock headgasket and ARP head studs. Go talk to diambo4life about that.

Looks like your pushing the limits on that one buddy. If anyone was half worried about the head lifting they wouldnt boost over 20 psi. Better safe then sorry on that one.

You be responsible for telling him he can hold 25 psi and his HG blowing, I wont.

also for the guy above, He's running a t-28 not a t-25. That turbo will hold more then 15 psi.

 

[90blacktsiawd]

98evoIII keep in mind that while what i say has been proven time and time again, there always that moron out there that just ups the boost without thinkin and blows a HG due to excessive detonation. Tune it properly and you shouldn't have a problem.

I'm not just pulling these figures out of my ass. People have been able to repeatedly run that much boost on said said up.

 

[reyvin]

I bought the FP Big 28 DSM Turbo and I love it. I just now got my BOV so I can increase boost and I'm wondering what your advice is as far as how much to go with? The car has a K/N filter, BOV, Apexi exhaust, the turbo mentioned, and that is it.
It's got 155000 on it though, which I realize is high, but doesn't have any mechanical problems. I'm wondering on your opinion of an increased, yet safe setting would be?
I'm not interested in nuking the engine, as I cannot afford a rebuild. But, I wouldn't mind adding a couple pounds to test this new turbo some.

Thanks!

 

[Wildeclipse2000]

If you have no fuel mods yet, I wouldn't really do much. Get your fuel system up to snuff, and then you can safely turn up the boost.

 

[reyvin]

If you have no fuel mods yet, I wouldn't really do much. Get your fuel system up to snuff, and then you can safely turn up the boost.

So you recommend bigger pump as well as injectors or...?

In the meantime, would 1-2 lbs hurt it?

Thanks for the reply.

 

[Wildeclipse2000]

If you bump it up a couple PSI it shouldn't hurt.

 

[boostedtsi0069]

What are you boosting now? Consider getting a fuel pump and atleast 550s before turning up the boost.

 

[kspharris]

First I would like to say it is nice to see someone else from TN on here. Second what boost level are you running now? You don't have to have injectors but I would recommend a 190lph at least for safe measure. With that you should be able to run 14 psi with no ill effect. You might be able to get 16 psi without knock and running lean but you NEED a logger for that as well. If you want to do 16 psi then you NEED both the logger and the fuel pump. You DO have a boost gauge right? Let us know and glad you are in TN. Do you ever go to a track?

 

[reyvin]

First I would like to say it is nice to see someone else from TN on here. Second what boost level are you running now? You don't have to have injectors but I would recommend a 190lph at least for safe measure. With that you should be able to run 14 psi with no ill effect. You might be able to get 16 psi without knock and running lean but you NEED a logger for that as well. If you want to do 16 psi then you NEED both the logger and the fuel pump. You DO have a boost gauge right? Let us know and glad you are in TN. Do you ever go to a track?

I do have a boost gauge, yes. It's set at the stock 11 lbs right now. The closest track to me is in Huntsville (where I work also) but I've still not ever gone. Wish I had earlier before the mods, just to baseline though.

 

[kspharris]

Well if your ever on your way to Nashville shoot me a PM and maybe we can go to the track. Good luck with your car.

 

[reyvin]

Well if your ever on your way to Nashville shoot me a PM and maybe we can go to the track. Good luck with your car.

Thanks for the kind offer.

Well, I get the BOV on last night and take the car for a rip and it's pulling even more now. I hit it and watch the needle fly up to 15 lbs! I didn't make any adjustment though? Why would the boost have increased if the MBC wasn't touched?
Also, it didn't have any problems, so can I leave it set where it's at or should I decrease it for any safety reason?

 

[kspharris]

It is probably because the boost controller was set at 15 psi and the BOV was letting it only go to 11psi. If it is not knocking then I would leave it alone, but you REALLY should get a logger and a 190 lph.

 

[reyvin]

It is probably because the boost controller was set at 15 psi and the BOV was letting it only go to 11psi. If it is not knocking then I would leave it alone, but you REALLY should get a logger and a 190 lph.

I've not heard any knock. At least, not any knock that I didn't have before...the lifters have been noisy in this car since I've owned it (about four years now) but from what I understand, that's nothing to get excited over.

 

[Spoolio]

If you are going to be upgrading more and more in the future, i would atleast get a walbro 255lph FP, Fuel pressure regulator, and atleast 550-660cc injectors, that will hold you off for a little while till you start boosting 20+

 

[reyvin]

If you are going to be upgrading more and more in the future, i would atleast get a walbro 255lph FP, Fuel pressure regulator, and atleast 550-660cc injectors, that will hold you off for a little while till you start boosting 20+

I don't want the car to ever be 'unstreetable' because it is my daily driver (and probably will be forever). I can't imagine going over 20, as 15 gave me quite a surprise. Partially because I expected 11 still, I suppose!

This thing rocks, I'm loving it!

 

[Spoolio]

I am glad your loving your dsm, but dude, i have a 255lph in my car, im planning on doing 660's soon, i drive my car everyday, i used to drive it 70miles a day for months, i mean i dont have all the mods i would like, but look at my profile and see what i have. This is my daily driven car for everything, besides my motorcycle, but i rarelly get into riding it anymore.

I've been pushing 14-16psi daily for awhile now, idk what kinda tuning devices you have or logger, but with good tuning you can drive 17-18psi daily with the correct modifications.

 

[reyvin]

I am glad your loving your dsm, but dude, i have a 255lph in my car, im planning on doing 660's soon, i drive my car everyday, i used to drive it 70miles a day for months, i mean i dont have all the mods i would like, but look at my profile and see what i have. This is my daily driven car for everything, besides my motorcycle, but i rarelly get into riding it anymore.

I've been pushing 14-16psi daily for awhile now, idk what kinda tuning devices you have or logger, but with good tuning you can drive 17-18psi daily with the correct modifications.

I'll certainly take what you said to heart and keep that on my list of 'wants' (fuel upgrades) seeing as how several people have recommended that path to me next.

Thanks again!

 

[Spoolio]

No problem, i hope you enjoy your car, they are loads of fun

 

[800_Speed]

Here is a list of my current mods:

greddy 18g turbo kit
act 2600 clutch
greddy type RS bov
boost gauge, mbc
stock side mount with upgraded hard intercooler pipes

thats pretty much it for performance... im running a modest 10psi right now on this setup, what do you all think i can run safely until i get my fuel management system and walbro/injectors?

 

[awdtalontsi1992]

I wouldn't recommend going up above 12-14 without some sort of datalogger to check the knock count and injector duty times.

 

[SpoolN]

I wouldn't recommend going up above 12-14 without some sort of datalogger to check the knock count and injector duty times.

Agreed...

 

[800_Speed]

yeah i was thinking its probably about time for a DSMlink, all these mods i wanna do next and damn i wish i had the cash for all of them

 

[chicagoavenger]

No one can tell you, Here is a tip get some type of logger/widband and turn up the boost untill YOU see it starting to pull timing or get knock etc etc. Each car is differnt some guys do fine at 17psi on a 16g on stock fuel and other knock at 14psi with the same set up. Who knows if you have pisswater 91 like we do or 93. I know we are talking about a 18g but the concept is the same. Each car is different and anyone that tells you that you can run X amount of boost is guessing. Only YOU will be able to tell for sure. I would really get your fuel set up first before anything IMO

 

[oldman]

No one can tell you, Here is a tip get some type of logger/widband and turn up the boost untill YOU see it starting to pull timing or get knock etc etc. Each car is differnt some guys do fine at 17psi on a 16g on stock fuel and other knock at 14psi with the same set up. Who knows if you have pisswater 91 like we do or 93. I know we are talking about a 18g but the concept is the same. Each car is different and anyone that tells you that you can run X amount of boost is guessing. Only YOU will be able to tell for sure. I would really get your fuel set up first before anything IMO

Repost!!! At least you remember to change 16g to 18g.