Boosting 30 psi on 14b

[fastestdsm]

So many people say that the 14 b is only efficient up to 20-22 psi.. WHile I was driving today, I hit 30 lbs of boost on a 14b, luckily I did not get on it so I let off right away I knew there was a problem. Been looking at the profec I installed, thought maybe it was the profec but it ended up being a stupid vaccum leak that made me boost high. One of the vaccum hoses came loose so the turbo worked whatever it could. Luckily I didnt damage nothing Im assuming? Car runs great still
Luckily I have my warning on my profec set at 18 and boost 16 so I knew what happend.

Is 30 psi safe on this motor? If I ever boostesd 30 on a honda it would have to be fully built.

 

[EclipseTrbo420A]

As long as you didnt pull 30 lbs through 4 gears acouple of times, I think you are ok. They say the 14B can HOLD 21-23, but its efficent at about 17-18.....now waterinjection is a difffernt story haha. I think if you cool now..just do a boost leak test to make sure 30 psi didnt loosen anything up.

 

[Derek]

I have seen only one stock 4g63 run 30psi, but the MegaSquirt EFI leaned out and made it go boom.

if you are gonna run much more than about 18 psi, you will need a logger to make sure you are not knocking, and to nail down a good tune. Other than that, 25 psi is no sweat on the stock internals, just so long as you put in some stronger headstuds, and maybe a MLS or Cometic head gasket.

 

[Talesin]

It's possible to boost 30psi on a 14b, but it's WAY outside the efficiency footprint (aka: BLAZING hot charge!), and you likely overspun the turbo as well. I'd take it easy for a little while, just to be on the safe side.

 

[fastestdsm]

well the ride was for 2 hour roadtrip, first road trip with my dsm. The car boosts crazy when I accellerate to pass and I felt fuel cut, so I checked the profec and it showed me 303 which is read in kpsi. I pulled over, looked for the boost controller I added and it looked fine, I limped it back to my destination looked over it again and it was a vaccum hose off the pipe that I had missed, I was so pissed I couldnt mash on my dsm during the roadtrip, but I guess it was a good thing, I did save more gas and had less abuse on my dsm. Anyway, the car seems fine, I didnt boost that much for over 1 sec, as soon I hite higher boost I let off.
I do know how turbos work btw

 

[nightspeed87]

well i kno a kid with a 91 laser and he had a 16g and he hit 30 pounds on stock internals and was racing and after like 5grand rpm on his third run he blew the engine from too much pressure. so i dont think id be safe to try out too often especially if its a evertdat driver.. if you hit 30 psi but was still in low rpms and got off of it quick your engine should be fine, just get your turbo inspected and you should be ok

 

[GVR4592]

There are plenty of stock bottom end 6 bolts running over 30 psi. Supporting mods and good tuning are what makes it last.

 

[fastestdsm]

I inspeteced turbo today, no shaft play but u never know. It was not like I was trying to boost that much, the vaccum hose off the greddy sensor came off bleeding the turbo so it was like running the wastegate with no vaccum line hooked up hence making it max the turbo out, this happend to me on my civic as well, luckily I backed up on the throttle quick enough.

 

[sakrafice]

Is 30 psi safe on this motor? If I ever boostesd 30 on a honda it would have to be fully built.

To answer your question. stock no. The head can only handle i think 22psi without blowing head gaskets frequently. You need ARP Headstuds and a good gasket to be able to handle Lots of boost. You are pushing your luck over 20 IMO

 

[GVR4592]

To answer your question. stock no. The head can only handle i think 22psi without blowing head gaskets frequently. You need ARP Headstuds and a good gasket to be able to handle Lots of boost. You are pushing your luck over 20 IMO

The stock composite headgasket and stock bolts have been taken over 40 psi and 650+ whp.

I daily drove my car for over a year with stock gasket and stock bolts at 25 psi on pump gas, and many other people have gone farther than that.

Where do you guys come up with this stuff?

 

[92awddsm]

The stock composite headgasket and stock bolts have been taken over 40 psi and 650+ whp.

I daily drove my car for over a year with stock gasket and stock bolts at 25 psi on pump gas, and many other people have gone farther than that.

Where do you guys come up with this stuff?

I have to agree. I have run as much as 28psi on a 50trim with stock hg and stock bolts. The hg usually doesnt blow from high boost, it goes due to a bad tune or overheating.

Anyway, a 30psi spike usually doesnt hurt anything in a situation like that, specially with something as small as a 14b. If there was a problem, it would have been immediately noticed.

 

[sakrafice]

And we all wonder why the dsm has a rep of breaking down so much.... maybe because so many boost there car so much on stock motors .

http://members.shaw.ca/costall/1000Q/answers-performance.htm

oh so running highboost does nothing? oh wait it can strech oem head studs last time i checked.

 

[92awddsm]

And we all wonder why the dsm has a rep of breaking down so much.... maybe because so many boost there car so much on stock motors .

http://members.shaw.ca/costall/1000Q/answers-performance.htm

oh so running highboost does nothing? oh wait it can strech oem head studs last time i checked.

And I can honestly say that I have been running 25-26psi daily for over 2 years and have never had my dsm break down. And if it did, I would fix it, not get on here askin advice from people when only about half of them can change their own oil and less than that can troubleshoot a modded dsm.

I have also been driving and modding dsm's since they were introduced. You will not stretch the headbolts on a 6 bolt motor with anything less that 30 psi and a good tune. With a bad tune and knock, you will fatigue the bolts and burn the fire rings in the hg.

 

[sakrafice]

Im not trying to argue with you, but he does not have a 6bolt, he has a 7bolt according to his profile being a 98 gsx... and the 7bolt studs are not as thick, also, i said "I think" he was asking for advice, hence I said IMO.. But, most dsm'rs just do bigger turbo and tend to blow it up and wonder why. And then call the car a peice of shit because its unreliable, Its because of people like you that think its fine to run 30 psi all day when the car is not setup for it hence they go boom.

Dont say it will do it all day long stock. Your car has the supporting mods according to your profile to run that daily, he dont end of story. And I can turn a wrench, Have a nice day.

 

[GVR4592]

You're obviously inexperienced in these matters. You're basing your OPINION on something that you read on a webiste. We are basing our FACTS on experience and what we've seen with our own eyes. If you don't have direct experience with something or a good understanding of what you are talking about, don't post.

 

[sakrafice]

No actually I do know from experience. I confirmed it with a link as well. I've worked on many dsm's and most my friends don't have to complain about all the problems with there cars because there not stupid enough to run there car without supporting mods. 30 PSI on stock shit, I want to see the thread. I've yet to see 30 psi on stock 7bolt studs and gasket without problems. ... but go a head and tell them to run that daily and end up with a spun bearing, or blow your low end out, or the head gasket your going to blow because you know it's a dsm and can handle anything.

 

[GVR4592]

I ran my car for a year with a stock head gasket and bolts at 25 psi daily and occasionally to 28-30 psi. I bought the ARP parts way back when I first got the car because, like you I was wrong and thought that I needed to upgrade. Well the parts sat in my closet for a very very long time. The only reason they went in is because my balance shaft belt snapped and bent my valves. I didn't want to wait and order a new gasket from Mitsubishi. I had a spare cylinder head already and all of the parts so I threw them in. It was very convenient, the parts were there so I used them, rather than having my daily driver down for a week or more.

I'm not going to argue with you about something that I have done, numerous other people have done, and I know to be a fact. I could give you a bunch of links, but it won't make a difference. You've already made up your mind. If you want to discuss it further, start a new thread or this one will get closed.

 

[fastestdsm]

Im not trying to argue with you, but he does not have a 6bolt, he has a 7bolt according to his profile being a 98 gsx... and the 7bolt studs are not as thick, also, i said "I think" he was asking for advice, hence I said IMO.. But, most dsm'rs just do bigger turbo and tend to blow it up and wonder why. And then call the car a peice of shit because its unreliable, Its because of people like you that think its fine to run 30 psi all day when the car is not setup for it hence they go boom.

Dont say it will do it all day long stock. Your car has the supporting mods according to your profile to run that daily, he dont end of story. And I can turn a wrench, Have a nice day.

who said anything about running 30 psi all day long? your just seeing things now. read the post first.

 

[sakrafice]

you asked "Is 30 psi safe on this motor? " then he said its fine daily, thats how it started. no links, no proof. Im done with this thread. And it should be closed.

 

[92awddsm]

you asked "Is 30 psi safe on this motor? " then he said its fine daily, thats how it started. no links, no proof. Im done with this thread. And it should be closed.

Funny how this guy is the only one in this whole thread that even mentioned running 30psi daily. I guess that really shows who was and wasnt paying attention to what they read or typed.

Anyway, like I already stated, any problems that arose from your 30psi spike would have been noticed immediately. If you didnt notice anything wrong, you are fine. Happy boosting.

 

[fastestdsm]

Funny how this guy is the only one in this whole thread that even mentioned running 30psi daily. I guess that really shows who was and wasnt paying attention to what they read or typed.

Anyway, like I already stated, any problems that arose from your 30psi spike would have been noticed immediately. If you didnt notice anything wrong, you are fine. Happy boosting.

thank you thats all Iwanted to know, and no I did not notice anything, I drove the car for about another 200 miles now, engine seems good, hg didnt blow.

 

[Jeff822]

I had the same problem as you but it was my t-2slow boosting up to 25 pounds, when i got my new MBC on they noticed my greddy profec b-spec 2 was hooked up wrong and causing the WGA to only open when it wanted too, its probably the connection on the profec.

 

[dsmdan83]

30 lbs is way out of the efficiency range for a 14b. It you ran that constantly you would only be blowing hot air and that would cause detention and extremely high Egt temps. Your manifold and turbo would most likely have heat related stress cracks too. I know this cause I just bought my friends 97 Gsx and he was doing the same thing and the top of the manifold has a huge crack in between the turbo mounting bolts.