25psi on T25

[JMiller]

As the title states, i hit 25psi on my t25 only did it once though cause i don't have money to buy a new turbo. But before i put my FMIC on i could only hit 21psi before fuel cut. My question is, could running rich from having the FMIC cause me to hit fuel cut later, cause i thought you hit fuel cut when the turbo sucks in to much air so it should hit fuel cut at 21psi every time because even though it has a FMIC that won't effect how much air the turbo sucks in at 21psi. Any thoughts.

Thanks

 

[red_devil]

As the title states, i hit 25psi on my t25 only did it once though cause i don't have money to buy a new turbo. But before i put my FMIC on i could only hit 21psi before fuel cut. My question is, could running rich from having the FMIC cause me to hit fuel cut later, cause i thought you hit fuel cut when the turbo sucks in to much air so it should hit fuel cut at 21psi every time because even though it has a FMIC that won't effect how much air the turbo sucks in at 21psi. Any thoughts.

Thanks

A little confused at what your saying. First of why in the heck are you running that much boost on the mouse fart turbo? Back it down to 14psi and run a log (or buy one it you dont have one) and see how its doing. Dont worry about fuel cut so much you should be more worried that you are running to much boost on the T25 and stock injectors from what itseems like from your profile.

 

[whiteflash]

From my understanding, anything about 15-16 psi on a t25 yields no more gains. Might as well keep it in that range

 

[zhjiln]

running a t25 on that much boost is pointless... your just shortening its lifespan ..

 

[AWDbacon]

26psi is even to much for the 14b let a lone the t-25!!! i would be careful before u start blowing stuff up. take small steps at a time.

 

[cheap90gsx]

i would be more worried about the engine then the turbo. maybe you should learn more about what you're doing before you do it.

 

[BoostFrenzy]

My question is, could running rich from having the FMIC cause me to hit fuel cut later...

Why would adding a FMIC make you run rich might I ask?

 

[DSM_PWR]

i hit 25psi on my t25 only did it once though cause i don't have money to buy a new turbo....

Well i hope you've been saving up because i doubt your turbo will last long ...

I can guarantee your not running rich,
in your profile i see nothing to tune/raise the airfuel,
i seen nothing of an upgraded fuel pump (or at least a rewire)
and im hoping your logging with something?
minimum wideband ?? WTF

Please lower back down to stock psi and upgrade properly

*Please dont say your Air/Fuel narrowband is telling you your rich*

 

[e85_4g63]

I know everyone is saying things that may seem mean towards you, but it's true. Also, typing actual sentences and using periods and such would be a really good idea too.

 

[JMiller]

, reading this has been very entertaining. Yes i know the T25 is only good around 16psi, yes the narrowband said it was running rich and no i didn't do anything to my fuel set up yet. I was told by the guy who put my cams in that with as big of a FMIC i have i could turn the boost up to like 18psi and be fine(because of the increased volume that needed to be filled), yea i know its over working the turbo, yea i know i need a logger, but my question was why can now all of a sudden can it boost to 25psi on a "mouse fart turbo" when before it could only boost to 21psi then fuel cut. I do understand everyones comments and concerns but i only did this once. I drive around on 15psi which feels like 10psi with the front mount, but until i can go pick up new turbo, its my own fault for putting the front mount on. So thanks again and someone please answer my original question.

Thanks

 

[live4my4g63]

ive never heard of hitting that much on that small of a turbo.

 

[talonDSMerr]

You'd actually be running leaner with the front mount, you can't trust the narrowband. Since the FMIC cools your intake air temps a little bit (cooler air is denser), you would have more air for the same amount of fuel because you have no tuning device to add more fuel. I would venture out to guess that even though you're running lean, which is very dangerous for your motor, at 25psi, you're probably maxing out your stock injectors, causing you to hit fuel cut. This would explain why you were hitting it at 21psi without the front mount. Lower your boost until you get supporting mods or you'll have to start from scratch.

 

[daren_p]

Be careful, a narrowband is completely useless to tell you if your running too rich/too lean. By the time the narrow band says lean, it will be far to late. Do not go by its reading, it is only accurate in a very narrow range, right around 14.7 to 1. You sway from this even a couple points & the narrow band just reads full rich or full lean.

Where is your boost gauge sourced? It doesn't matter if your running the tiny stocker or a large FMIC, 15psi is still 15psi (that is, if your boost gauge is sourced in a normal location). Your lag may have slightly increased just becasue the T25 is so small but were not talking huge difference here. The only difference is that FMIC may be creating more power at the same boost level because it probably flows better/has less pressure dop & has increased cooling efficency.

 

[bmylez]

Agreed. I'd say the main reason you were able to hit 25 psi instead of 21 is that the FMIC raises the efficiency of your turbo a little, like the poster above me said. And you said you got cams installed??? I guess cams are ok with stock turbo and all to give you more oomph, but there's no way you'd be getting all the gains unless you have: fuel pump (Walbro 190 at the least), stock Evo VIII injectors at the least (560 cc I think?), a wideband O2, Apexi SAFC (or ECMLink would be better), and full 3" exhaust, just for starters.

 

[JusMX141]

My question is, could running rich from having the FMIC cause me to hit fuel cut later, cause i thought you hit fuel cut when the turbo sucks in to much air so it should hit fuel cut at 21psi every time because even though it has a FMIC that won't effect how much air the turbo sucks in at 21psi. Any thoughts.

You're not running richer due to the FMIC, you're just making more efficient boost pressure because the FMIC is cooling the charge air better. This will lead to less knock and less timing pull. However, at 25psi the T25 is just making hot air....and not much of it.

I still can't see how you're getting to 25psi with a T25 unless there's some type of wastegate malfunction. I think it's best you back your boost down to 15psi or so until you get a bigger turbo, fuel system mods, and some way to tune.

 

[housegsx]

^I've hit 25psi on my T25 when I had it. My old boost controller froze up in the cold or something and spiked to 25psi instantly in 1st gear. Now, the car didn't go anywhere since it was a T25 and could only manage that kind of boost up to like 2500rpm.

 

[JusMX141]

Haha yeah that's what I was thinking....SURE it made 25psi, but how LONG did it make 25psi?

 

[JMiller]

Ok i was thinking the opposite would happen when i added the FMIC, and yes i have comp 200 cams. I hit 25psi cause i have a mbc and i screwed it in to much(and my wastegate won't open under 15psi). I source my boost gauge from the intake manifold. I only turned the boost up to see if it would get rid of the laggy feel i get under 3500 rpms. And once again i know that the narrowband is a POS, but its better than nothing. I plan on buying a logger soon, i already have a compatible pda for it. Also will be getting a MAFT setup and maybe evo injectors before i get a bigger turbo. I'm trying to get all the supporting mods first then get a turbo(probably a 18g). I also know that a MAFT is not good for tuning as much as DSMLink or even an AFC. So thanks again for clearing everything up for me.

Thanks

 

[viprez586]

I only turned the boost up to see if it would get rid of the laggy feel i get under 3500 rpms.

Turning up the boost will not help with boost response/spool up. The T-25 is probably the fastest spooling MHI turbo or any that you will find on a DSM. By increasing the boost, the turbo still has to spool up to achieve peak pressure.

If you feel like your turbo is lagging it could be due to the fact of the oversized FMIC for that T-25. Or the internal wastegate is not working properly. My internal wastegate seat had cracked so horribly that i would reach 10psi by 4k RPMS. If the wastegate diaphragm is extremely weak it might be blown open initially not allowing a quick spool.

 

[JMiller]

My wastegate isn't cracked up if anything its not opening all the way. I'm just not getting that turbo feel like i do when running open downpipe with the sidemount. I'm pretty sure its cause i got that big intercooler, but its okay cause that gives me something to look forward to when i upgrade.

Thanks