how much boost 16g 255lb fuel pump

[playa69jcr]

i have q 91 gsx i got 16g and i was woundering how much boost i can push with a 255lb fuel pump i also got 650cc NOT INSTALLED I was told if i was to installed without something to tune with i would flood my engine so i was just want to know how much i can push for now with a 16g and a 255lb fuel pump i was thinking about 18psi or so???????

 

[PitBullDsm]

I'm pretty sure the stock injectors max out at 16psi.

 

[kottyking]

Do you have a fpr to go with that wally 255, cause your gonna need one...

 

[keslerkaiyu]

With a 255 won't you be flooding anyway without a pressure regualtor?

 

[numlock666]

Do you have some sort of FPR? becuase without that, your feul pressure is too high, and you will run rich.

 

[Nvisabl]

i have q 91 gsx i got 16g and i was woundering how much boost i can push with a 255lb fuel pump i also got 650cc NOT INSTALLED I was told if i was to installed without something to tune with i would flood my engine so i was just want to know how much i can push for now with a 16g and a 255lb fuel pump i was thinking about 18psi or so???????

I wouldn't worry too much about how much boost you can run you are going to hit fuel cut anyway. Gutting the maf will buy you some time. The cheapest fix is put the pump and injectors in . Get a used AFC or afc2 they can be had for around $100.00 get a datalogger. I wouldn't worry about the fpr at this point I run a 255hp in Both my Mirage and My colt on stock ones and never have a problem, Colt makes 330 whp on a 330,000 mile stock 4g61t.

DJ
www.dsmtuners.com
89 colt turbo ( casper)
89 Mirage turbo (Nvisabl)
91 Talon awd (slowest 578whp in the country

 

[iwannagofast89]

I'm wondering the same thing.......wouldn't it be to low and be running lean????

I'm have the 16g Areamotive FPR, walbro 290 high flow (rewired), and DSM link on 650cc injector

can I go 25 psi

 

[kottyking]

If you are running a 255 GET A REGULATOR, before you tune get a datalogger,but yes throw them 650's in and get an afc and get it tuned. That would be the cheapest method. I've personally had problems when running a 255 without a regulator, i dont know how the dude above me hasnt.

 

[playa69jcr]

see thats the thing i dnt have fpr or an afc and i dnt have money for a dsm link right now thats why i was wondering how much boost can i push with just a 255lb fuel pump on a
16g b/c i have read that with my stock fuel system i can push 15psi but thats on a 14b witch is differnt then a 16g i thought that the 255lb fuel pump would mean more boost do you get what im saying????

 

[playa69jcr]

since i dont have a fpr or afc ect. what boost can i push now

 

[numlock666]

the question isnt how much boost, you can boost all you want, I run 16-17lbs on my b16G with stock fuel systems. I bet my IDC's are 100% but im not pulling any timing. The real question how your tune is going to be. Telling you now, with the 255lph your going to be running rich, possibly rich enough to cause rich knock. Boost by itself doesn't make power, it's your tune. You can run 20lbs of boost if you want, but a car on 15lbs with a good tune will still pull harder.

 

[daarkness92]

run the stock fuel system and stock boost around 15-16psi until you get something to tune with

 

[daarkness92]

then you can safley add more boost

 

[kottyking]

I wouldnt run more then 14 psi. As stated your stock injectors are going to be maxed out around 16 psi, Just settle down till you can buy the supporting mods, then tune it. Buy a logger for cheap right away though, just to see how things are running.

 

[playa69jcr]

where can i get a logger for cheap and will that tell me how rich or lean im running

 

[snowborder714]

I would look into MMCd (as it's free). Yes, it will be able to tell you if you're running rich/lean if you know how to read the output or post up the logs and someone here will help you.

MMCd

Do a search for MMCd on the forums and see what threads are out there for it.


As for the original topic of this thread, DO NOT install the 650's until you have something to control them with.
GET AN AFPR ASAP.
Just run on stock boost for now (unless you want to turn it up and risk damaging your engine).
Don't listen to Nvisabl.

I'm wondering the same thing.......wouldn't it be to low and be running lean????

I'm have the 16g Areamotive FPR, walbro 290 high flow (rewired), and DSM link on 650cc injector

can I go 25 psi

Please don't highjack someone else's thread. No, your fuel pressure will be too high and you'll be running rich since you'll be overrunning your stock FPR. And I didn't know they made 290lph pumps

 

[kottyking]

Go to ebay, type in 1g datalogger. Then buy a serial connecter/cable and buy the cheapest palm pilot you can get. A logger allows you to log :RPMs, Injector Pulse Width, Knock Count,O2v, Throttle Position, Injector Duty Cycle, Timing, Coolant Temp, Air Temp,Barometric Pressure, ISC position, Low-Med-High Fuel Trims, MAF airflow. Also allows you to read and clear any Check Engine Light Codes. WELL WORTH IT! Then you'll be all ready to tune with an afc when you get one too. These things pay for them self when you can diagnose your own problems and fix them yourself. Good Luck

 

[laserspeeddemon]

Wow, theres quiet a bit of wrong information here.

1st) Should you get an AFPR? YES!!! Do you have to? NO!!! At WOT the injectors are opening more frequently and you lose some pressure so at WOT you won't be running ruch. At idle and lower loads you will indeed run rich. Personally I did not have that problem, I can not explain why other then the fact that I may have not been getting enough voltage. I did not rewire my fuel pump.

2nd) To answer your question. With a larger fuel pump and a 16g with 450cc injectors your can run 18 psi safely, I ran 19 psi but that is a risk I was willing to take.

 

[playa69jcr]

thanks finaly someone answers my question thanks laserspeeddemon that exactly what i was looking for

 

[2gGSX]

Wow, theres quiet a bit of wrong information here.

1st) Should you get an AFPR? YES!!! Do you have to? NO!!! At WOT the injectors are opening more frequently and you lose some pressure so at WOT you won't be running ruch. At idle and lower loads you will indeed run rich. Personally I did not have that problem, I can not explain why other then the fact that I may have not been getting enough voltage. I did not rewire my fuel pump.

2nd) To answer your question. With a larger fuel pump and a 16g with 450cc injectors your can run 18 psi safely, I ran 19 psi but that is a risk I was willing to take.

Edited 2nd) As suggested before, buy a logger and run as much boost as you can without knock.

 

[playa69jcr]

will the knock destory my engine if so how i dont know much about it???
will in be ok just to run about 17-18psi for now till i get a data logger or a dsmlink witch to me seems to be a better choice i actully only run the car about a 50 miles a week so i dont think in should be to bad its not my daily driver

 

[laserspeeddemon]

Pre-ignition or spontaneous combustion happens when the fuel is ignited before the spark is lit off. It is as bad as beating your piston with a metal hammer and it sounds just like that, which is why it is called knock. Knock can be caused be a number of things; hot spots in the cylinder, bad fuel, over compression of the air/fuel mixture, etc.

Think of it like this; imagine your fist is a piston, and a 3" pipe is the cylinder. Like a piston you move your hand in and out the pipe. Now imagine out of now where someone smashes the top of your fist with a hammer as your are moving it up. Not only will you break your hand but your probably radius or ulna as well (the bones of your forearm). That is why knock destroys your engine.


And yes a logger is a very good idea, but if you car is running in optimal condition then a logger is not needed, just suggested. It was the best $100 I spent on this car.

 

[playa69jcr]

so it would be ok to run 17-18 psi on a 16g with a 255lb fuel pump for now ???

 

[2gGSX]

If you can do that without getting any knock, or running your IDCs sky high, then yes.

 

[kottyking]

which he needs a logger to tell! GET A DAMN LOGGER and stop asking.......