t25 running 20+lbs?

[nightmares GS-T]

After recently installing a 1g bov and removing my cat I noticed that when I floor it my boost spikes to 20+ lbs and holds steady at 17-18lbs up until about 6000 rpms where it drops to 15 lbs. I was just wondering if this was safe to run or if there is a problem causing the boost spike? all of my mods are listed in my profile so if you need to know my setup please just look.

 

[rEclipserGST]

You do not have a bcs. Buy one. Are you hitting fuel cut at all? t25 doesnt really push anymore air after 17 psi compared to 15 psi. It can only compress so much air.

 

[t25fury]

his bcs restrictor is removed not the whole bcs,my t-25 would spike to 21 psi during very cold outside temperatures,otherwise,15 psi is about the max of the tiny hairdryer.You will be ok,its uncommon for people to destroy their engines on the t25,besides it only blows hot air outside of its effieceincy range,wich is about stock boost level (or below 15 psi).

 

[rEclipserGST]

his bcs restrictor is removed not the whole bcs,my t-25 would spike to 21 psi during very cold outside temperatures,otherwise,15 psi is about the max of the tiny hairdryer.You will be ok,its uncommon for people to destroy their engines on the t25,besides it only blows hot air outside of its effieceincy range,wich is about stock boost level (or below 15 psi).

I meant MBC.

 

[JusMX141]

I was just wondering if this was safe to run...

Sure as long as you have a way to log or tune. Just look for pieces of T25 thrust bearing to end up in your oil pan at some point.

 

[DSM_PWR]

20psi??... why stop there when you can go to 30psi

 

[nightmares GS-T]

You do not have a bcs. Buy one. Are you hitting fuel cut at all? t25 doesnt really push anymore air after 17 psi compared to 15 psi. It can only compress so much air.

no its not hitting fuel cut at all and it seems to be running fine, I was just checking to see if anyone else has had this problem as well and if it was anything to worry about

 

[nightmares GS-T]

20psi??... why stop there when you can go to 30psi

LMFAO, right, 30lbs on a basically bone stock engine

 

[Choch1]

I think the piont everyone is making is that you will not make any more hp past 17pounds, after that you just stuffing hot ait into the motor. So why not go 30 you will make the same power.

 

[ian7321]

LMFAO, right, 30lbs on a basically bone stock engine

Ahhh the noobs still dont realize the humor in that statement.

I would get a MBC immediately and turn the boost down to 15psi, there is not point in trying to run a t25 at anything over that. Also you are running the VERY high risk of over spinning that turbo, and blowing it to shit.
Granted you are not making enough power to blow an engine or tranny, but if the turbo does blow, as t25's are very prone to do then it can take out your engine, with MASSIVE oil loss and/or chra pieces going into your oil pan and making their way throughout your motor.

Bottom line, get a MBC, they are $30 to $50, or you can make one for less than $10

-Ian

 

[zhjiln]

you can run on 20 psi on a t25... you know why... even at that psi it doesnt flow enough to blow your motor...

but your turbo wont last too long at 20 psi ... just stick it at 15 psi ...

 

[pboglio]

Its not only about compressor flow. Your run enough boost on a stock fuel pump, and you can pretty much shut it down, leaning the shit out of the motor in the process. I've done in on my Denso 150 LPH before I rewired it. The physical boost pressure acts like a big hand loading the electric motor and slowing the pump down. Having more airflow doesn't help either. On a stock fuel pump rewire, I'd say he's probably fine. But a simple 02 voltage log would clearly show if this is happening or not. I sure wouldn't be going on a forum to ask whether I'd blow my motor. Who knows how badly clogged your injectors are, how old the fuel pump is, etc. etc. Get a datalog to know for sure, or a fuel pressure check at WOT. I think back in the day I measured 58 psi at WOT which seemed about right for 17 psi.

 

[regulator213]

again to reiterate, even if your running 17 lb's on that turbo you are just pushing hot air into your motor which is in the end going to just rob you of power. And you will blow your turbo a lot faster than normal. So it may be safe for your engine (until your turbo discombobulates) but not for your turbo.

NXS MANUAL BOOST CONTROLLER GSX GST TSI EVO 1.8 XS MBC :eBay Motors (item 260352448835 end time Oct-22-09 14:12:04 PDT)

that will do you just fine at 13 psi. When you start building more boost you will want to upgrade to a hallman pro or something of the sort as those start to get real touchy at high boost levels.

 

[slinarez25]

I bought one of those MBCs, it's good quality and holds up nicely. Find an aution that says "buy it now" or "make offer" because i typed in $15.00 just for shits and giggles and they took it!

 

[knochgoon24]

I thought these things were made to take the abuse?
I wouldn't expect it to take long before it looked like this.

YouTube - Blown T25 - Shaft play anyone?

 

[mrTalonAWD95]

if youre too cheap to buy a mbc, make one. i made one, but instead of it running on a dial, i just change out the springs (stiffer = more boost). i got one for 12, 15, and 18psi respectively. cost me all of $3 to make.

 

[JusMX141]

I bought one of those MBCs, it's good quality and holds up nicely. Find an aution that says "buy it now" or "make offer" because i typed in $15.00 just for shits and giggles and they took it!

What separates the good manual boost controllers from the bad ones isn't their exterior appearance, it's their internals as well as their sensitivity.

I had an experience with one of those knockoff MBC's on a customer's car a while back. Once you finally reached the sweet spot, it was a guessing game to find out how much boost you were actually going to be running. On a normal MBC you raise the boost 1psi or so per 1/4 turn inward.....this thing was all over the place. You'd be at 12psi with a target of 15psi, so you'd turn the knob in 1/2 turn and you'd be at 18psi. Turn it back out 1/8 of a turn and you'd be back at 12psi. So much for tuneability.

You get what you pay for, and this particular Chinese specialty item wasn't worth my time.

 

[pboglio]

I could never stand using a manual boost controller. I've used the same HKS EVC for the last 16 years, works flawlessly.

 

[nightmares GS-T]

you can run on 20 psi on a t25... you know why... even at that psi it doesnt flow enough to blow your motor...

but your turbo wont last too long at 20 psi ... just stick it at 15 psi ...

i never said it ran constantly at 20 lbs i just said it spiked at 20 and wanted to know if these boost spikes would cause problems? it runs great and pulls fine

 

[weegee411]

I run 25 psi on my t25 and Ive had it that way for a year and haven't had any problems and my turbo is still holding up strong. I check once a month for play and there is still no play at all.

 

[nightmares GS-T]

I run 25 psi on my t25 and Ive had it that way for a year and haven't had any problems and my turbo is still holding up strong. I check once a month for play and there is still no play at all.

If a t25 would somehow miraculously push 25 lbs it would be nothing but hot air

 

[DSM_PWR]

I run 25 psi on my t25 and Ive had it that way for a year and haven't had any problems and my turbo is still holding up strong. I check once a month for play and there is still no play at all.

... is this a joke?

 

[jrohner]

Just try to get rid of the boost spike. Is your boost source close to the turbo like stock or moved to the intake? The closer to the turbo the less it will spike. It shouldn't really spike at all, especially since you don't have a MBC. You don't need a MBC to adjust your boost anyways really, you can just use something to restrict how much air is bled off from the T. I've ran pretty much every boost level up to around 21psi without a boost controller on my talon, and on a friends' laser with no issue.

 

[RMawddsm]

I think there needs to be a discussion about compressor maps. Remember: Just because you can doesn't mean you should.

 

[MakeIt2BreakIt]

a t-25 at 20+lbs i would rather run a small blow torch....probably less heat out of the torch