PSI question??

[2g99]

ok im running at 11 psi right now and i have been wanting to bring it up to 15 psi. but i dont know if it will do any difference in performane? can any one help me?? will i get any performance increase?

-Thank You
2G99

 

[my dreamt dsm]

Sup! How was the drive back from our little meet .
You'll feel a little in the butt dyno. Every car is different HP wise!

 

[yoshi_tony]

yes it will more boost means more power.....

but remember you need a FMIC and fuel upgrades metal head gasket and arp head stud to run more than 17psi or you will get fuel cuts

i would recommend not to run more than 14psi without a FMIC

 

[2g99]

yes it will more boost means more power.....

but remember you need a FMIC and fuel upgrades metal head gasket and arp head stud to run more than 17psi or you will get fuel cuts

i would recommend not to run more than 14psi without a FMIC

i already have the fuel upgrades, just not the FMIC
and is there any way to tell what head gasket i have and if i have arp studs??
im still learning what the previous owner did.

Sup! How was the drive back from our little meet .
You'll feel a little in the butt dyno. Every car is different HP wise!

Sup! the ride back was good, the vette had some fun leaving the park haha!
it never gets old watching a vette get on the gas!! hah

 

[yoshi_tony]

the head gasket should be poping a little threw the corners of the head unless you want to check its very clear from the bottom of the intake manifold their will about an inch poping out, taking the valve cover off arp's are the bolt with a nut....stock head bolt its just a bolt

 

[dsmtunz]

you should be good to up the boost just make sure your not running lean if you get a a/f gague you could check and make sure of it

 

[2g99]

would i have to take the valve cover off for the studs??
sorry for all the dumb questions

you should be good to up the boost just make sure your not running lean if you get a a/f gague you could check and make sure of it

yea im working on trying to get one of those but its a little hard being 17 with my car payment and dumb gas prices in california

 

[94_TSi]

yes it will more boost means more power.....

but remember you need a FMIC and fuel upgrades metal head gasket and arp head stud to run more than 17psi or you will get fuel cuts

i would recommend not to run more than 14psi without a FMIC

This is some of the worst information I have seen given on the site. Wrong wrong and a little more wrong. To the op, get a real boost gauge stock one wont due, also managemant system/logger and your there.

 

[yoshi_tony]

yeah unless you can see it threw your oil cap valve covers are easy to take off and put back on

 

[2g99]

This is some of the worst information I have seen given on the site. Wrong wrong and a little more wrong. To the op, get a real boost gauge stock one wont due, also managemant system/logger and your there.

i already have the boost gauge, and would the SAFC-2 work?

yeah unless you can see it threw your oil cap valve covers are easy to take off and put back on

ok thank you

 

[yoshi_tony]

This is some of the worst information I have seen given on the site. Wrong wrong and a little more wrong. To the op, get a real boost gauge stock one wont due, also managemant system/logger and your there.

i guess if you say im wrong about everything to the OP listen to 94_TSI and just boost the crap out of it see what happens with no FMIC i mean you can boost it more with no FMIC but not for a long time or all that heat from the turbo will go into your manifold and something can be damaged...

94_TSI what do you mean boost gauge stock one that dosn't make any sense if your talking about the stock boost gauge in the cluster im pretty sure he has an aftermarket boost gauge because he said his boosting 11psi and yes you can get their but not the safe way

the safc will work

 

[Alex7747]

This is some of the worst information I have seen given on the site. Wrong wrong and a little more wrong. To the op, get a real boost gauge stock one wont due, also managemant system/logger and your there.

x2

you'll be fine at 15 psi

 

[newTSIguy]

I was running 17 psi on stock head gasket, stock fuel system, and stock smic, with no problems,

 

[2g99]

ok, that will be my goal for tomorrow. to find out if i have those stuff im hoping so cause i dont feel like spending to much $$ right now

 

[Chaosweaver]

I would suggest a front mount, at 15PSI the stock side mount will be at its limit and will start to heat soak. As for tuning, get yourself a wideband, DO NOT tune without at least a wideband to keep an eye on your air/fuel. I would also check what fuel pump you have, I noticed it said you have an "unknown" fuel pump, which could be extremely bad if it can't keep up with the airflow and injectors. Besides that, you should be fine, if you're still on the stock T-25 look into upgrading sometime soon, I would suggest a 16G or a 20G, those are some good turbos and will be good for 300-350HP on a decent setup and tune.

 

[Alex7747]

i guess if you say im wrong about everything to the OP listen to 94_TSI and just boost the crap out of it see what happens with no FMIC i mean you can boost it more with no FMIC but not for a long time or all that heat from the turbo will go into your manifold and something can be damaged...

94_TSI what do you mean boost gauge stock one that dosn't make any sense if your talking about the stock boost gauge in the cluster im pretty sure he has an aftermarket boost gauge because he said his boosting 11psi and yes you can get their but not the safe way

the safc will work

The OP said the wants to run 15 psi. He wasnt talking about boosting the crap out of it. He doesnt NEED all this extra stuff you mentioned. The stock headgasket (assuming he has one) can handle upwards of 30 psi. Head studs arent need either. But wouldnt hurt. And a tune would be great after its at 15 psi.

 

[94_TSi]

yes it will more boost means more power.....

but remember you need a FMIC and fuel upgrades metal head gasket and arp head stud to run more than 17psi or you will get fuel cuts

i would recommend not to run more than 14psi without a FMIC

Yes what you said is wrong lets clear this up real quick. Fmic not needed for 17 psi.
Fuel upgrades-His profile states he has a pump and 550's hes good on fuel.
Metal hg-Mitsu stock composite hg is the best you can run up to right around 30 pounds of boost.
Stock headbolts-Will carry 17 psi all day long.
You throwing out 14psi without a front mount, please please give me the reasoning behind this I cant wait.

Keep this in mind bad information is worse than no info at all.

 

[2g99]

I would suggest a front mount, at 15PSI the stock side mount will be at its limit and will start to heat soak. As for tuning, get yourself a wideband, DO NOT tune without at least a wideband to keep an eye on your air/fuel. I would also check what fuel pump you have, I noticed it said you have an "unknown" fuel pump, which could be extremely bad if it can't keep up with the airflow and injectors. Besides that, you should be fine, if you're still on the stock T-25 look into upgrading sometime soon, I would suggest a 16G or a 20G, those are some good turbos and will be good for 300-350HP on a decent setup and tune.

yea im trying to get the wideband as soon as possible. and i think i have a wally fuel pump manly because they are known for their whine and i can hear a slight whine comingfrom the fuel pump area. and i would hope that the owner before me was smart enough to put a fuel pump when he upgraded the injectors to 550

thank you for your info was helpful

 

[2g99]

Yes what you said is wrong lets clear this up real quick. Fmic not needed for 17 psi.
Fuel upgrades-His profile states he has a pump and 550's hes good on fuel.
Metal hg-Mitsu stock composite hg is the best you can run up to right around 30 pounds of boost.
Stock headbolts-Will carry 17 psi all day long.
You throwing out 14psi without a front mount, please please give me the reasoning behind this I cant wait.

Keep this in mind bad information is worse than no info at all.

so basically your saying i should be good to go to 15 psi?

 

[98GSXtacy]

^I totally agree. There is absolutely no reason anyone should be recommending a fmic for 15 psi. Unless he is road racing his car(which I highly doubt on a t25 at 15 psi), the side mount is not going to heat soak quickly and a fmic is totally unnecessary.

 

[2g99]

Thank you!! Haha
op listen to this guy

haha im not on the forum much so im guessing OP is me right?? haha

^I totally agree. There is absolutely no reason anyone should be recommending a fmic for 15 psi. Unless he is road racing his car(which I highly doubt on a t25 at 15 psi), the side mount is not going to heat soak quickly and a fmic is totally unnecessary.

ok thank you!!
so what would be the highest and safest psi i could go to for right now, w/o a wideband?? 15??

 

[94_TSi]

haha im not on the forum much so im guessing OP is me right?? haha



ok thank you!!
so what would be the highest and safest psi i could go to for right now, w/o a wideband?? 15??

There is no way to tell you 100% that at 15lbs your car is fine via the internet. Generally speaking though if eveything is correct with the car you wont see any issues at that boost level.

 

[Alex7747]

The most id boost with stock everything would be 16 psi, maybe 17.
Just turn it up to 15 psi and you'll be good to go.

 

[2g99]

ok thank you guys, you were all very helpful.
thank you again!

ill try to keep you guys posted on how it goes

 

[9!'clipseDOHC]

ok im running at 11 psi right now and i have been wanting to bring it up to 15 psi. but i dont know if it will do any difference in performane? can any one help me?? will i get any performance increase?

-Thank You
2G99

First: Yes, more boost generally equals your power. However there are a few things you should do before just raising the boost. Follow the upgrade paths listed here, Tech Guide: 2G 4G63t Upgrades - DSMtuners and it will save you a lot of heartache and money along the way. Start by opening up the intake and exhaust, getting an accurat boost gauge, a MBC, a larger fuel pump, and a better BOV (since you have a plastic 2g one). Then feel free to raise the boost to 14-15 psi and enjoy.

Second: Let me try to clear up a few missconceptions in this thread. A FMIC is a good thing to have, especially the more boost you are running. That being said, you can get by with the stock intercooler, just don't expect to be making back to back passes as it will become heatsoaked and decrease your performance and can cause knock (which is bad). You can use it, just give it time to cool down.

I always recommend the OEM Mitsubishi composate head gasket unless you are going to pull the engine and have the block and head resurfaced. MLS head gaskets require a very fine surface to seal properly. If you are not going to do that then stick with the stock head gasket and use ARP studs. This is good for most street/strip DSM builds.

If you already have 550 injectors do you have a logger or anything to tune with? I know you mentioned something about a SAFC, do you already one? If you do then you are already well on your way to running more then 15 psi. Just take your time and boost responsibly. Once you start messing with fuel trims a wideband o2 sensor and a logger are highly recommended to prevent damaging your engine. Please don't skimp in this area, it will just cost more in the long run.

That's all I've got so far. Hope this helps!