how much boost

[Marcus]

I have a big16g, 550's, afc, denso pump, 2gmas, 2.5 back, and pocketlogger. I want to know how much boost i can run on 93 octane and still be safe to the motor, i could care less if the turbo craps out.

 

[FourG63 97GST]

I would boost 18psi on that setup
I would keep an eye on the EGTs and for knock, if you want to go more.

 

[FINETUNED]

I have the same setup less the injectors and anything over 15psi is fuel-cut why?????

 

[L2RTSiAWD]

On 93 with very good tuning you could get 20lbs. But I would say 18 to be safe.

FINED TUNED your hitting fuel cut becasue you don't have enough injector.

 

[FINETUNED]

What should I gat a fuel cut defencer or bigger injectors???

 

[candela]

He has a 2g maf also... I ran my setup like that at 18psi on 91 octane

 

[PimpBlackTalon]

Originally posted by FINETUNED
I have the same setup less the injectors and anything over 15psi is fuel-cut why?????

had a similar problem with mine b4 i swapped my plugs for colder ones
and moved to the magnecore wires. The problem i was having was obviously not fuel cut, but sure as hell felt like it. Try the NGK BPR7ES.. they're one range colder than the stockers.. You might not get the same fuel economy as you would with iridium or platinum or even the stock copper, but you can run all the boost you want.. within reason of course .. :laugh: Edit: After thinking about it, it is bad advice to tell you not to get injectors because you would be compromising the safety of your engine. Although, I would recommend EGT and air/fuel gauges to keep better track of the engine conditions. On your 1G I do believe a knock LED is not out of the question either.

Peace

 

[nine5raptor]

plugs and wires won't fix a fc problem...

he is hitting the calculated max airflow that the stock injectors can handle and still be within the preset bounds burned into the ecu. injectors are the answer.
a fcd is dangerous. the fuel cut is a warning that you are running out of injector.

 

[PimpBlackTalon]

Originally posted by nine5raptor
plugs and wires won't fix a fc problem...

he is hitting the calculated max airflow that the stock injectors can handle and still be within the preset bounds burned into the ecu. injectors are the answer.
a fcd is dangerous. the fuel cut is a warning that you are running out of injector.

Agreed.
Fuel cut is nothing to dick around with.. (or any lean condition)
Can the stock injectors really run out at 15 pounds on a 16G?? Doesn't seem like enough air.

 

[pneumo]

No intercooler upgrade? The best way to tell how much boost to safely run is to use the pocketlogger and log some WOT runs and watch for knock. Try to keep it under 10. Use the afc to fine tune the fuel to minimize knock.
The big 16g should be good up to 25 psi, so I don't think you'll burn it out at 18 or so.

 

[nine5raptor]

talking about running out of fuel on a b16g at 15psi, not out of airflow...

depends on the amount of air the engine is ingesting at that 15 psi. if your airflow is freed up, it takes less pressure to move the same amount of air molecules.

btw I hit fc around 19-20 on a 14b with a restrictive exhuast.

 

[FINETUNED]

So is it safe to say that a big 16g flows the same amount of air @ 15lbs as a 14b does @ 19-20lbs....makes sense to me TO MUCH AIR AND NOT ENOUGH FUEL....

 

[nine5raptor]

fuel cut is independent of "NOT ENOUGH FUEL...." the amount of air you flow at XXpsi will depend on the VE of the engine and i/e restrictions. If we had the same setup except for you had a 16G and I had a 14B, we would flow nearly identical amounts of air.

 

[PimpBlackTalon]

Originally posted by nine5raptor
fuel cut is independent of "NOT ENOUGH FUEL...." the amount of air you flow at XXpsi will depend on the VE of the engine and i/e restrictions. If we had the same setup except for you had a 16G and I had a 14B, we would flow nearly identical amounts of air.

huh? what a waste of money buying bigger turbos! if they don't do any good i wonder why they make the cars faster? hmmmmmm
btw.. what is VE?

 

[nine5raptor]

Originally posted by PimpBlackTalon


huh? what a waste of money buying bigger turbos! if they don't do any good i wonder why they make the cars faster? hmmmmmm
btw.. what is VE?

ve is the answer to your question. volumetric efficiency. the larger turbo reduces the restriction in the exhaust, allowing the motor to run more efficiently. the turbo at the same boost level will heat the air slightly less and will be a slightly less restriction giving slightly more power at the same boost level.
however, the reason for switching to a larger turbo is the greater potential for running higher boost and still be in the compressor's efficiency range.

right back atcha! :laugh:

 

[PimpBlackTalon]

Originally posted by PimpBlackTalon


huh? what a waste of money buying bigger turbos! if they don't do any good i wonder why they make the cars faster? hmmmmmm
btw.. what is VE?

SARCASM -------^

 

[nine5raptor]

thank god....I was wondering with all of your mods.