increased the boost car feels slower?

[crfridah]

okay so im running the stock turbo and i just installed a ball and spring mbc i upped the boost to 14psi and when i pulled it in 2nd gear it felt slower then when i was running stock boost at first i thought it was the crappy stock bov but the gauge reads 14psi so does that mean its not the bov?

 

[white92talontsi]

okay so im running the stock turbo and i just installed a ball and spring mbc i upped the boost to 14psi and when i pulled it in 2nd gear it felt slower then when i was running stock boost at first i thought it was the crappy stock bov but the gauge reads 14psi so does that mean its not the bov?

It is probably knocking. Is that all you did was put a MBC on it and turn the boost up? Any supporting mod's to go along with the MBC? Accurate boost gauge?Fuel pump? Injectors? Wideband? Any of that?

If not the take the MBC off and go back to stock until you can afford the supporting mods to start turning up the boost.

I am in no way shape or form trying to be harsh just trying to save you the headache of a blown engine.

 

[erkitner]

Agreed. Going back to basics, a turbocharger is an exhaust-driven air compressor. Although you MAY be forcing more air into the cylinders, you vehicle has probably not been sufficiently upgraded for all the SUPPORTING systems. When you force more air in, you NEED more fuel in order to still achieve proper air/fuel ratios (stoichiometry). Upgrade your other systems to support the additional forced induction for proper operation.

 

[brownie956]

I disagree with the above posts. The stock fuel system and ECU can easily handle and have enough headroom for the T25 at 14psi. The acceptable range for stock boost pressure is 6.4-14.7. So it should obviously handle 14psi. It sounds to me like your turbo is working too hard to produce the 14psi if you're feeling slower at that pressure, especially if you don't have any hard intake/IC plumbing. I would do a boost leak test first and see where you're at. If you get all leaks taken care of and still feel slow, pull you're intercooler to make sure you don't have oil sitting in it. There's a number of factors that could contribute to your issue, but the most likely in my opinion is that you're turbo is working too hard to produce the 14 psi due to leaks or an inefficient intercooler. If that's the case, it will be running hotter and hotter air into the engine, you're engine pulls timing to prevent knock, making it a vicious cycle of slow.

 

[erkitner]

I disagree with the above posts. The stock fuel system and ECU can easily handle and have enough headroom for the T25 at 14psi. The acceptable range for stock boost pressure is 6.4-14.7. So it should obviously handle 14psi. It sounds to me like your turbo is working too hard to produce the 14psi if you're feeling slower at that pressure, especially if you don't have any hard intake/IC plumbing. I would do a boost leak test first and see where you're at. If you get all leaks taken care of and still feel slow, pull you're intercooler to make sure you don't have oil sitting in it. There's a number of factors that could contribute to your issue, but the most likely in my opinion is that you're turbo is working too hard to produce the 14 psi due to leaks or an inefficient intercooler. If that's the case, it will be running hotter and hotter air into the engine, you're engine pulls timing to prevent knock, making it a vicious cycle of slow.

And this is why we all contribute to this wonderful forum. I agree as well.

I also appreciate your input AND explanation rather than most people's "Boost leak" answer. Tired of it.

Cheers.

 

[Cdc1221]

Agreed Brownie. The stock bpv can only handle 14 psi, so anything over that is keeping the wastegate closed, building up unnecessarily high backpressure, and still only getting 14 paid worth of air, which is acually less than what it would flow with less backpressure.

Turn your boost down just to the point where it will just barely hit 14 until you get a blowoff valve

 

[WES_393]

I disagree with the above posts. The stock fuel system and ECU can easily handle and have enough headroom for the T25 at 14psi. The acceptable range for stock boost pressure is 6.4-14.7. So it should obviously handle 14psi. It sounds to me like your turbo is working too hard to produce the 14psi if you're feeling slower at that pressure, especially if you don't have any hard intake/IC plumbing. I would do a boost leak test first and see where you're at. If you get all leaks taken care of and still feel slow, pull you're intercooler to make sure you don't have oil sitting in it. There's a number of factors that could contribute to your issue, but the most likely in my opinion is that you're turbo is working too hard to produce the 14 psi due to leaks or an inefficient intercooler. If that's the case, it will be running hotter and hotter air into the engine, you're engine pulls timing to prevent knock, making it a vicious cycle of slow.

If not the take the MBC off and go back to stock until you can afford the supporting mods to start turning up the boost.

Wouldn't an intercooler count as "supporting mods", just like white92 said?

OP- The exact supporting mods you lack is debatable, but the fact is you lack supporting mods. And to be honest, the T25 is not a very efficient turbo to begin with. You could boost to 25psi and not feel much difference. The only thing your doing is creating a hotter air charge which will rob you of horsepower and cause knock. When the ECU see's knock, it pulls timing to keep the engine in one piece.

But rather than trying to push the T25 (which will only lead to an early death), I'd suggest a 14b or 16g along with proper supporting mods before you even dream of cranking up the boost.

 

[Eagle96TalonTSi]

Might be causing more boost to push through your boost leaks. Might be you spinning the tires?

For all of you recommending him keep the MBC on, youre not very smart - But thats okay.

Regardless of what the car can HANDLE, why not be more preservative? Sure it can handle 14 psi, but wont last half as long as if you babied it around on stock or under 12 PSI.

If youve got a t25 (Which you do) Take a MBC off. Get DSMLink and a bigger turbo, then mess with your boost levels. 3 or 4 psi on a T25 isnt going to make enough of a difference to risk destroying your motor.

But ignore me like the rest so I can pull off your car next time I make a trip to the junkyard.

GL

 

[crfridah]

Alright thanks for the info I have a bov I jist need a hard pipe to install it ill turn the boost down to stock see if it feels back to normal Or not thanks a lot everyone I apreciiate the infor

Might be causing more boost to push through your boost leaks. Might be you spinning the tires?

For all of you recommending him keep the MBC on, youre not very smart - But thats okay.

Regardless of what the car can HANDLE, why not be more preservative? Sure it can handle 14 psi, but wont last half as long as if you babied it around on stock or under 12 PSI.

If youve got a t25 (Which you do) Take a MBC off. Get DSMLink and a bigger turbo, then mess with your boost levels. 3 or 4 psi on a T25 isnt going to make enough of a difference to risk destroying your motor.

But ignore me like the rest so I can pull off your car next time I make a trip to the junkyard.

GL

And the day my car goes to the junkyard is the day I die b.c I've wanted one of these cars for 8-10 years now and I plan I keeping it for a lonnnggg time

It is probably knocking. Is that all you did was put a MBC on it and turn the boost up? Any supporting mod's to go along with the MBC? Accurate boost gauge?Fuel pump? Injectors? Wideband? Any of that?

If not the take the MBC off and go back to stock until you can afford the supporting mods to start turning up the boost.

I am in no way shape or form trying to be harsh just trying to save you the headache of a blown engine.

I have an aftermarket boost gauge and 550 injectors full turbo back exhaust, intake , cams and I think thats it also if I buy a bigger fuel pump do I still need to do a rewire?

 

[Cdc1221]

People recommend it but not a necessity. A 190 lph will go 300 whp stock wiring, which is about all youll get on 550s

 

[turboglenn]

I didn't read every replu but let e break it down to basics... more boost is more heat,, more boost and more heat on the same fuel and oils with a given of at least a proper air fuel ratio, and you end up with a noisier engine and an ECU that's pulling timing based on heat and load ranges, in turn you're making more boost but making less use of the boost/airflow because the timing is retarded to a higher effect than that of the air you added..

it's why i went stand alone, even with supporting mods (FMIC< fuel pump etc...) every third pull the car woudl build boost aand barely move for the same reasons and nothign i did made it consistant as i wanted it to be so i went to an ECU that let me eliminate variables and not think about knock sensors, just performance,, There's a level where safety features make up for user error or lack of experience and when you gain one you learn how to defeat the other

in other words this is normal, keep in the game and you'll come out on top

 

[Simadowna119]

Might be causing more boost to push through your boost leaks. Might be you spinning the tires?

For all of you recommending him keep the MBC on, youre not very smart - But thats okay.

Regardless of what the car can HANDLE, why not be more preservative? Sure it can handle 14 psi, but wont last half as long as if you babied it around on stock or under 12 PSI.

If youve got a t25 (Which you do) Take a MBC off. Get DSMLink and a bigger turbo, then mess with your boost levels. 3 or 4 psi on a T25 isnt going to make enough of a difference to risk destroying your motor.

But ignore me like the rest so I can pull off your car next time I make a trip to the junkyard.

GL

He already said it HOLDS 15lbs, and are you seriously asking him if he's spinning?
So all he has to do is get a "big" turbo and a dsmlink then he can crank the boost up? he's obviously looking for help and not ignoring anything but I would recommend he ignore your post.
Your not very smart - but that's ok

FYI, be careful who you take advice from. I ran 18lbs on a stock 1g BOV with stock wastegate NOT staying closed at 14lbs and creating unwanted backpressure for over a year. Did that on two different setups/cars w/ supporting mods. I have also put down over 300hp on 550cc injectors.
Wireing the fuel pump In does help, I could post a link explaining how/why if you like.
Lots of false info running through this thread!

You need to do all the proper maintainence, then start moding in the PROPER order.

 

[Cdc1221]

He already said it HOLDS 15lbs, and are you seriously asking him if he's spinning?
So all he has to do is get a "big" turbo and a dsmlink then he can crank the boost up? he's obviously looking for help and not ignoring anything but I would recommend he ignore your post.
Your not very smart - but that's ok

FYI, be careful who you take advice from. I ran 18lbs on a stock 1g BOV with stock wastegate NOT staying closed at 14lbs and creating unwanted backpressure for over a year. Did that on two different setups/cars w/ supporting mods. I have also put down over 300hp on 550cc injectors.
Wireing the fuel pump In does help, I could post a link explaining how/why if you like.
Lots of false info running through this thread!

You need to do all the proper maintainence, then start moding in the PROPER order.

I never said it wouldnt help, only that its not necessary. If you run a 255 hp with 560s(my setup), sure rewiring flows more fuel, but totally unmecessary on that setup

 

[clipto]

Honestly there are tons of things being talked about here. From seeing many many dsms and of course my own car, your rather in a stock faze. Now what I am saying you should not expect the car to be a lot first just upping boost a couple psi. Honestly unless you do small amount of tuning you're not going to see a lot of difference. Now maybe if you have a 14b with a little more fuel then maybe you can pull a little more in the higher end. but honestly if you want to so some power out of the cars you are going too need to do some of the basics. 16g, bigger fuel pump, bigger injectors, and of course the main part a "tune" etc then you will see something noticeable. Dont exspect a 3,000 pound car to move so quick with so little. So my main point is don't worry about a couple little pounds of boost if I drive fine and get you going a little bit of get up and go then you'll be fine. So you wanna feel more power or anything then what you're looking at now beyond what you got now, then you better start saving some money and start ordering some more performance parts then you can make some power. So open the boost as it is right now is pointless is the only just wasting a little bit more gas to go a little smidgen faster you won't feel. Hope that forced you insite on horsepower making for cars. Its just a 4 banger.

 

[crfridah]

He already said it HOLDS 15lbs, and are you seriously asking him if he's spinning?
So all he has to do is get a "big" turbo and a dsmlink then he can crank the boost up? he's obviously looking for help and not ignoring anything but I would recommend he ignore your post.
Your not very smart - but that's ok

FYI, be careful who you take advice from. I ran 18lbs on a stock 1g BOV with stock wastegate NOT staying closed at 14lbs and creating unwanted backpressure for over a year. Did that on two different setups/cars w/ supporting mods. I have also put down over 300hp on 550cc injectors.
Wireing the fuel pump In does help, I could post a link explaining how/why if you like.
Lots of false info running through this thread!

You need to do all the proper maintainence, then start moding in the PROPER order.

if you could post the link that would awsome thank you

Honestly there are tons of things being talked about here. From seeing many many dsms and of course my own car, your rather in a stock faze. Now what I am saying you should not expect the car to be a lot first just upping boost a couple psi. Honestly unless you do small amount of tuning you're not going to see a lot of difference. Now maybe if you have a 14b with a little more fuel then maybe you can pull a little more in the higher end. but honestly if you want to so some power out of the cars you are going too need to do some of the basics. 16g, bigger fuel pump, bigger injectors, and of course the main part a "tune" etc then you will see something noticeable. Dont exspect a 3,000 pound car to move so quick with so little. So my main point is don't worry about a couple little pounds of boost if I drive fine and get you going a little bit of get up and go then you'll be fine. So you wanna feel more power or anything then what you're looking at now beyond what you got now, then you better start saving some money and start ordering some more performance parts then you can make some power. So open the boost as it is right now is pointless is the only just wasting a little bit more gas to go a little smidgen faster you won't feel. Hope that forced you insite on horsepower making for cars. Its just a 4 banger.

well i know i need more supporting mods i wasnt expecting it to feel crazy fast or even a diffrence it was just weird that it felt slower to me ya know?

 

[Tyeler18]

My question- What are you using to compensate for the 550 injectors. Since I didn't see anything listed.

 

[crfridah]

My question- What are you using to compensate for the 550 injectors. Since I didn't see anything listed.

what do you mean?

 

[Diamond Star Werks]

what do you mean?

Means 550 injectors or any injector any size but stock are not bolt, on you need some way to compensate for them. Only exception is a 1g with a 2g mas and 550s.

 

[Diamond Star Werks]

If your on a t25 at 15 psi:
1) do not raise boost any higher
2) stock fuel system is more than adequate for it
3) if its cutting out at that level you have an issue. Whether boost leak or something else.
Oh..gotta work. Be back.

 

[arabeclipse]

This might be a stupid question, but did you make sure the mbc is on the right way?

 

[DSMnoobsause]

what do you mean?

tuning wise. you cant just run 550's

 

[EisHERE]

what do you mean?

Basically he means what are you using to compensate for the extra fuel the 550's are giving you

 

[Simadowna119]

http://www.dsmtuners.com/forums/bolt-tech/329528-fuel-pump-rewire-do-i-really-need.html

Advantages of re-wireing the fuel pump.

 

[Eagle96TalonTSi]

He already said it HOLDS 15lbs, and are you seriously asking him if he's spinning?
So all he has to do is get a "big" turbo and a dsmlink then he can crank the boost up? he's obviously looking for help and not ignoring anything but I would recommend he ignore your post.
Your not very smart - but that's ok

FYI, be careful who you take advice from. I ran 18lbs on a stock 1g BOV with stock wastegate NOT staying closed at 14lbs and creating unwanted backpressure for over a year. Did that on two different setups/cars w/ supporting mods. I have also put down over 300hp on 550cc injectors.
Wireing the fuel pump In does help, I could post a link explaining how/why if you like.
Lots of false info running through this thread!

You need to do all the proper maintainence, then start moding in the PROPER order.

You're*

He needs a bigger turbo to run more boost SAFELY. A 16g can run 16 lbs like a t25 can run 9 lbs - EASILY. DSM Link will also help him run higher boost so he can see EVERYTHING going on with the car. He can run pulls and check the knock count to see exactly where his boost can be SAFELY, IDIOT. Jesus just gtfo here

Do you even own link? Still running factory ecu and tune? Yeah I thought so... Seeing as how you had to max out stock injectors to make 300 HP(assuming youre not full of shit - 95% sure you are) yet claim you had the 'supporting mods"?

You ran 18 lbs on a 14b and advise him to take YOUR ADVICE? HAHAHAHA Ahhh man. Then talk about having unwanted back pressure for years? You sir, need to sell your car to someone who is not an idiot before you blow it up.

OP - Youve always wanted a DSM and want to keep it forever, so why push it to its limits? You should be doing the exact opposite. Forget horsepower and showing off for now - Spend your money and resources on MAINTENANCE. MAINT - EN - ANCE. Belts, gaskets, clamps, hoses, bolts, nuts, and screws, NEW PARTS. Replace everything, that is assuming that you are true about what you say and really do want to keep the car forever and in good running shape.

Atleast Whats his face ^ did say ONE thing correct, make sure you are mindful of the advice you take - It just might be coming from a retard.

Oh and one more thing - You want to keep the car forever? Well do you want it to run? Okay, good. I want you to do something for me that will save you a ton of heartache.

1. Go outside
2. Pop the hood
3. Look at your MBC
4. Reach in and grab the SoB
5. Grip that sucker and RIP as hard as you can
6. Turn around - Throw it as FAR as you can.

Wanna know the #1 reason these cars end up sitting in someones backyard for 3 years before being hauled to a JY? Because they installed a MBC and spun a rod bearing or any other number of nasty things that can ultimately lead to needing a new motor.

 

[crfridah]

You're*

He needs a bigger turbo to run more boost SAFELY. A 16g can run 16 lbs like a t25 can run 9 lbs - EASILY. DSM Link will also help him run higher boost so he can see EVERYTHING going on with the car. He can run pulls and check the knock count to see exactly where his boost can be SAFELY, IDIOT. Jesus just gtfo here

Do you even own link? Still running factory ecu and tune? Yeah I thought so... Seeing as how you had to max out stock injectors to make 300 HP(assuming youre not full of shit - 95% sure you are) yet claim you had the 'supporting mods"?

You ran 18 lbs on a 14b and advise him to take YOUR ADVICE? HAHAHAHA Ahhh man. Then talk about having unwanted back pressure for years? You sir, need to sell your car to someone who is not an idiot before you blow it up.

OP - Youve always wanted a DSM and want to keep it forever, so why push it to its limits? You should be doing the exact opposite. Forget horsepower and showing off for now - Spend your money and resources on MAINTENANCE. MAINT - EN - ANCE. Belts, gaskets, clamps, hoses, bolts, nuts, and screws, NEW PARTS. Replace everything, that is assuming that you are true about what you say and really do want to keep the car forever and in good running shape.

Atleast Whats his face ^ did say ONE thing correct, make sure you are mindful of the advice you take - It just might be coming from a retard.

Oh and one more thing - You want to keep the car forever? Well do you want it to run? Okay, good. I want you to do something for me that will save you a ton of heartache.

1. Go outside
2. Pop the hood
3. Look at your MBC
4. Reach in and grab the SoB
5. Grip that sucker and RIP as hard as you can
6. Turn around - Throw it as FAR as you can.

Wanna know the #1 reason these cars end up sitting in someones backyard for 3 years before being hauled to a JY? Because they installed a MBC and spun a rod bearing or any other number of nasty things that can ultimately lead to needing a new motor.

okay ive heard this a million f***ing times maintenace maintenace maintenace maintenace i understand that... just saying maybe you should ask before you ass-u-me cause rather then my exhaust this is the first mod that i have boughten... sorry i wanted to make my car a little faster to put a smile on my face because alls ive spent my money on is maintenance like not trying to be an a** but i know i dont know half the info about these cars as you guys might but that doesnt mean im just another idiot

This might be a stupid question, but did you make sure the mbc is on the right way?

i put the bottom nipple to the turbo and the horizontal one to the wastegate