Can You Run 10psi w/o FCD

[MJG]

I've done plenty of searching,and I really haven't seen a definate answer on if you can run 10psi w/o fcd.... My mods are 3'cat back,modifed k&n intake cone, a/f , boost gauge, plugs,and turboxs bov,& MBC.... I really don't always drive the car like a bat out of hell, there are those special occasions when some idot pulls up next to me,and just has to rev it up... (lol2) Anyway I would appreciate it if anyone with more wisdom knows these answers..
THANX, MJG (burnout)

 

[505zoom]

What elevation are you at??? I can run 11psi during the day here at 5500ft, but then hit the cut when it gets colder. It depends more on the elev. and temp. than it does on psi.

 

[BOOSTR]

MJG: I have a turbo xs dual stage controller. I live in Florida so our climates are pretty similar. I run 6.9 in stage one and 10 in stage 2. I had it up to 13 in stage 2, but thats when I encountered the cut...it was really cold that day. So my answer is yes. It makes a big difference. All I have is the TXS and an Injen. all else is stock. Good Luck.

 

[Spooled]

I'm at a little under 600 ft. above sea level here in Livonia, MI and I have hit fuel cut at 8 psi. when it's really cold. The whole thing is that even though I can't run as much boost as 505zoom, the oxygen content (important part and the whole point of raising boost) is the same at a lower psi. Cars at lower altitudes are being fed denser air and therefore don't need as much boost.

For an extreme example, if you were to drive a car at 100,000 feet above sea level, the ambient air pressure is about 7 psi. The atmospheric pressure at sea level is about 14.7 psi. In order for the car at 100,000 feet to run the same as the car at sea level, you would have to have to boost 7.7 psi higher. The 4,900 ft difference between where 505zoom lives and where I live makes a big difference in how much boost you can run before the ECU hits the ceiling of how much O2 it can handle.

 

[yashooa]

I had my MBC set to 12PSI for about 30k miles and only hit the cut in 4th and 5th below 55 degrees when it gets down into the 30's I have hit it in the lowers gears. I have never hit the cut in weather warmer than the mid fifties.

 

[SuperSpud]

I do everyday, only had fuel cut once....

 

[505zoom]

I'm at a little under 600 ft. above sea level here in Livonia, MI and I have hit fuel cut at 8 psi. when it's really cold. The whole thing is that even though I can't run as much boost as 505zoom, the oxygen content (important part and the whole point of raising boost) is the same at a lower psi. Cars at lower altitudes are being fed denser air and therefore don't need as much boost.

For an extreme example, if you were to drive a car at 100,000 feet above sea level, the ambient air pressure is about 7 psi. The atmospheric pressure at sea level is about 14.7 psi. In order for the car at 100,000 feet to run the same as the car at sea level, you would have to have to boost 7.7 psi higher. The 4,900 ft difference between where 505zoom lives and where I live makes a big difference in how much boost you can run before the ECU hits the ceiling of how much O2 it can handle.

Great post!

 

[BLURSPEED]

Before I got the FCD I would hit the cut every morning and every night at 10psi. During the daytime when the temps were around 60 I wouldn't hit it.

 

[KyRaceFan]

Great post!

yea its a good post, but its unrealistic. There is a difference in boost at sea level, etc. But its not noticeable unless your thousands of feet up, or below sea level.


On topic. I hit fuel cut at 8psi when its abotu 30-40 degrees.
I have the FCD, and when its less than 20, i get cut at 12psi or more. I have the FCD tuned to allow the most boost it can, and still get it. :/

 

[MJG]

Thanks, for all the replies... But I still really don't know if i should get a FCD.. In Louisiana were way below sea level and it really only gets as low as 40,maybe high 30 for about 3mths out of the year.. I really only want to go as far as 10psi anyway I would like my motor to last for a while. Besides 10psi is way enough for that extra kick where i live.... Thanx

 

[jersey_emt]

I hit the fuel cut at stock boost with an Injen CAI on a freezing cold morning (0 degrees F)

 

[b00sted]

does joe ps fcd or fpr eliminate the need for flash?

 

[jersey_emt]

FPR helps with the hesitation by leaning out the fuel mixture a bit

FCD gets rid of the fuel cut, allowing you to run higher boost (which will also reduce the hesitation by adding more power)

 

[KyRaceFan]

FPR is for stock boost cars with hesitation.

FCD is for those who live in colder weather who want to run more boost without hitting the cut.





ps. i get tired of posting this over and over and over...

 

[gcotton]

try colder plugs

 

[DiscreetSpeed]

FPR is for stock boost cars with hesitation.

FCD is for those who live in colder weather who want to run more boost without hitting the cut.





ps. i get tired of posting this over and over and over...

fpr? =fuel pressure regulator or fuel pressure reducer.
a car that isnt stock can still benefit from the fuel pressure reducer, our engine still runs overly rich even after the flash or with the mods i have.
toning down this will improve performance. (uhm) tell me you know this?

 

[MJG]

Hey Discreet, I Know this issue just goes round and round.... so do you think I would be able to do 10psi w/o a FCD... I really don't rag the car out I just want the power to be there when needed, I will prob get a dual stage MBC.... I'm thinking thats the best bet.... THANX, MJG

 

[b00sted]

where can i find a fpr besides joe ps?

 

[DiscreetSpeed]

Hey Discreet, I Know this issue just goes round and round.... so do you think I would be able to do 10psi w/o a FCD... I really don't rag the car out I just want the power to be there when needed, I will prob get a dual stage MBC.... I'm thinking thats the best bet.... THANX, MJG

maybe, if its to cold youll hit...but when it starts warmin up youll be find.
but if you want a yes or no...then i would say yes you clould, you bein in lousiana the temp is about the same here in houston and i can run 10 all day.

 

[DiscreetSpeed]

where can i find a fpr besides joe ps?

you should check out what essential speed has done.... with a unflashed vehicle they slapped on a fmu to cut down on fuel and well...you see the number they pulled at 12psi 250hp and like 279tq on a not just stock car of course.