15psi on 16g. Feel the difference from T25?

[Chris_Sag]

Hi, just upgrade my t25 to a 16g after rebuilding my engine. The rebuild costed me so mutch that more upgrades have to wait. So im planing on running around 15-16psi on the 16g on stock fuel system and smic. "keep it safe"?

Could i expect my car to be stronger than with the T25? Or is 15psi to low for the 16g?

My goals is not to high but i hope i can feel the difference until i can afford a datalogger injectors fmic ect..

 

[drewboi]

the 16g flows more air than the the t25 so your gonna feel a difference pretty much no matter what... but at the same time id be careful with the stock fuel system.. you might want to leave it at waste gate pressure for now until you beef up your fuel setup.. also.. if you dont have any form of tuning device to make timing changes i wouldn't turn up the boost at all

 

[atips1]

I upgraded from a T25 on stock boost to an Evo3 on 15psi, and it's a pretty big difference. I'm rinning 750cc injectors.

 

[Chris_Sag]

Thank you for quick answer. I have tought about leaving it on wastegate pressure. How many psi is the wastegate usualy set to?

 

[Domkk333]

I say you'll definatly feel a difference. Me and a buddy just put a 14b (had a t25) on his gst and we felt a little difference. so a 16g is definatly gonna be better

 

[Chris_Sag]

No form for tuningdevices yet. I have just read that 15psi is max for the stock fuel system even im fully aware of that every engine is diffrent. (knocking ect) I want to keep it "safe" for now, but I was hoping to win some power at the upgrade. But if it is noticeable at wastegate pressure i will stick with it..

And how many Psi is the 16g wastegate set to?

 

[atips1]

I think it depends on the vendor. I've seen some people say 10psi for an Evo3, and some say 13.

 

[Chris_Sag]

Okey, let me know if i got this wrong. With my old t25 i ran on 15 psi but running on lower boost with a 16g will still make more power causes the better airflow?

Sorry for my bad english...

Should i still use the stock boost control solinoid or do i have to cut it out?

 

[atips1]

Yes, I believe that's correct.

 

[Chris_Sag]

Okey, good to know But could i still use the stock boostcontroll soinoid unit?

 

[Bluefire16]

Yes and NO. It depends on the efficiency range of the turbo. There are many variables to take into consideration.

15psi will pull much harder on the 16g than the T25. 15psi on a 16g is like 19 on a T25 for example.

And in short...everyone asks "what is safe" i used to run a small 16g with no more than a evo 8 fuel pump and could safely run 18-19psi.

Every car is different. You need to log first. Generally speaking however, 15psi is "safe"

 

[Chris_Sag]

Okey, i think i stick with the wastegate boost for now... Realy looking forward to test it..

 

[sexystover]

depends where u get the turbo i have a mhi evo 3 16g and wastegate pressure is 8psi but it creeps to 15psi by redline

 

[Bluefire16]

^^ Every car is different. Also depends on exhaust and like i said many different variables.

 

[rizzzo29]

Very true the actual noted level of max boost on stock fuel system is 18 (ish) lbs. Running 100% (over or under a bit is possible) injector duty cycle. Also keep in mind if its and auto or a manual car. Seeing as Auto dsm's run 390'ccs and manuals run 450cc's

Overall 15 lbs is safe boost, but hey its a 4g63. Whats safe?

 

[brian9397gsx]

When I changed out my T25 to the evo 16g at 15psi i did not feel to much of a gain, that is till i replaced my stock bov then it was a whole other story.

 

[Clinical]

if you want to be safe just stick to wastegate pressure for now, it'll still feel better than the t25

 

[endeffect0]

Here is the complete answer:

remember that there are two important characteristics of your turbo. the Pressure, and flow of the turbo.

we use PSI to measure pressure output and CFM or lbs/min flow or power. this flow number is far more important to determining how much power your car will have.

as a very vague estimate, every 1 lb/min is about 10 hp (give or take 1hp per lb/min) there is no such correlation between PSI and hp. however PSI is important in determine how much your engine systems must withstand. for example at a certain psi you stock intercooler and rubber intake pipes just cant stand up to the pressure. similarly non T-bolt clamps and stock style vacuum lines will fail at a higher psi.

generally a small turbo at a high pressure will flow X lbs/min where the larger turbo will flow the same lbs/min at much lower pressure. but take longer spool obviously.


so when your asking about the fuel system PSI is not relevant, its the total amount of air that you flow that requires the matching amount of fuel. Because your new larger turbo will flow a grater volume of air at the same PSI you will need more fuel.


so bottom line run waist-gate pressure on your new turbo or you will out run your fuel system and risk loosing your motor. When you get something like DSM link or some other engine management system you can add fuel and turn up the boost and really get rockin'!

 

[Bluefire16]

Very true the actual noted level of max boost on stock fuel system is 18 (ish) lbs. Running 100% (over or under a bit is possible) injector duty cycle. Also keep in mind if its and auto or a manual car. Seeing as Auto dsm's run 390'ccs and manuals run 450cc's

Overall 15 lbs is safe boost, but hey its a 4g63. Whats safe?

False. 2gs run 450s regardless of auto or manual.

1gs however ran 390s if they were auto. They also ran a smaller turbo.

 

[92AWDHX40]

Yep the 1g autos ran a 13g turbo, get some tuning mods, wideband, logger, link some sort of device before you get boost turned up.

 

[Chris_Sag]

Thank you for greate answers. I also have a manual FP controller but i still need a new fuelpump to deliver more fuel? Wally 190 or 255..
I consider going to the dyno and log the car and get it adjust to the right values AF ect..
But i will need å new fuel pump and injectors for that?
It can also be said that the car was running pig rich before the rebuild, but i dont know why... Maybe its a bad aftermarket fuel program? Dont know mutch about the car history when it was imported from the US to Norway.

 

[GAMEOVER]

I ran 19psi on a evo3 16g all day with only a 3000gt fuel pump, no problems, with a turbo xs boost controller, i left the factory boost solenoid electrical part plugged in , but took the vacuum hoses off and had the turbo xs boost controller from waste gate on the bottom fitting and the upper fitting hooked up to the intake manifold.

There should be a write up on a vacuum diagram for manual boost control if you use the search tool.

edit: everything else in the fuel system was still factory except the 3000gt fuel pump. I did install a brand new oem fuel filter though. thats always good to change when u dont know how old it is and also change your spark plugs to a new set of bpr7es, i had my plugs gapped at .028 and had good results.

hope this helps.

 

[92AWDHX40]

Great but, i like to see what my engine is actually doing, rather than i can run, so much psi, thats great but I like to run more than that safely. But again, thats great on your dsm. You need a 190 is fine 255 is a bit much depending on goals, look around on forums tonnes of info on upgrades with fuel mods, and injectors.

 

[bsbllfit7]

get a 255hp walbro thats all youll need for awhile, in most cases 2gs dont need a afpr. I ran i bar or 14.7psi on mine tell i through a rod no problems with it and pulled hard

 

[Chris_Sag]

Dont i need big injectors than 450?