550 injectors

[Needsoles]

so i have a set of 550 injectors on my 1g eclipse so my question is can i run a 190 fuel pump or do i have to run a 255 fuel pump

 

[slowgsr]

190 will support the amount of fuel needed for that size of injector at a factory base fuel pressure. I would suggest the 255 over the 190 though, fuel is very important.

Goodluck.

 

[Nicks2319]

190 will be fine. You could probably even get away with just rewiring your stock pump, but I would recommend the 190.

 

[matthewdesigns]

I run a rewired 190 on my 550's at up to 22psi, so yes, you can do that up to a certain point.

You need to be aware, though, that there's not a direct correlation between pump and injector sizes, as the amount of boost you are running has everything do with the amount of fuel you use. So you could theoretically run out of fuel even on that setup at really high boost pressures.

But chances are you'll be safe.

 

[winterftbl]

the 190 is good to 400hp, and up to 30 psi. YOu will be fine, rewire the fuel pump for the extra little bit.

 

[thorlief4g63]

If you have to buy a fuel pump go with the 255 because it is good to a much higher horse power in the long run. If you have a 190 it would be best to rewire it. Good Luck

 

[slowgsr]

the amount of boost you are running has everything do with the amount of fuel you use.

No it dosen't! 20psi on a 16G is going to use alot less fuel (and make alot less power) then 20psi on a t3/t04e 57trim .63ar. The amount of POWER you make has everything to do with the amount of fuel you use, get it straight.

the amount of boost you are running has everything do with the amount of fuel you use. So you could theoretically run out of fuel even on that setup at really high boost pressures.

The injector will run out before the pump at factory base fuel pressure, and the fuel pump was in question when compared to the injector size, your comment is irrelevant.

 

[matthewdesigns]

OP, everyone who's suggesting you install a 255 is omitting the fact that you will also need an Adjustable Fuel Pressure Regulator (AFPR) and a fuel pressure gauge to properly regulate the increased pressure from the pump. So consider that you'll have another $125-150 out of pocket to bump up to a 255.

If you are not planning on larger than 650's w/ more than 25psi on a smaller (Evo3 16g) turbo, then you'll be good with a rewired 190 (but right at the edge). If you want to go bigger on any of those variables then just pony up for the 255/afpr/gauge.

 

[xdxoxuxgx]

I would suggest a 255 over the 190, they're typically the same price and the larger one is always good insurance.

 

[matthewdesigns]

No it dosen't! 20psi on a 16G is going to use alot less fuel (and make alot less power) then 20psi on a t3/t04e 57trim .63ar. The amount of POWER you make has everything to do with the amount of fuel you use, get it straight.

I am aware that a larger turbo will move a greater volume of air at a given psi than a smaller one, and will therefore require a larger amount of fuel to be mixed with the incoming charge. My point was that as our cars operate on a rising rate fpr, the boost pressure has a direct relationship to the amount of fuel your car will be required to provide, above the base level. I have it straight, thanks.

The injector will run out before the pump at factory base fuel pressure, and the fuel pump was in question when compared to the injector size, your comment is irrelevant.

This was not the case on my car. I ran the stock 450's on my rewired STOCK pump at 16psi and ran out of fuel, and on a rewired 190 to 18psi before running out. So in my case it was obviously pump limited. Thereby leading me to answer his pump question with a variable that is definitely affected by pump capacities (higher boost = higher required pressure). So my answer was indeed relevant.

 

[wret]

550cc/min x 4 injectors = 132 liters per hour.

I am aware that a larger turbo will move a greater volume of air at a given psi than a smaller one, and will therefore require a larger amount of fuel to be mixed with the incoming charge. My point was that as our cars operate on a rising rate fpr, the boost pressure has a direct relationship to the amount of fuel your car will be required to provide, above the base level. I have it straight, thanks.

The rising rate is only to compensate for intake manifold pressure. Relative pressure at the injectors remains the same. 550 is 550 regardless of which turbo and how much boost.

The reason for the rising fuel pressure rate is to maintain the same pressure differential, otherwise fuel delivery would taper off under boost. Injectors are rated by the amount of fuel they can flow at 43.5 psi and open 100%. In actuality, the highest recommended duty cycle is 80%, so a 550 cc/min, will never actually flow that much. Therefore injectors will flow the same rates under boost, at a given IDC, as when not under boost.

Fuel pumps, on the other hand, are affected by boost pressure. The capacity rating of a fuel pump is what it should flow at 43.5 psi. As boost increases, the fuel line pressure increases the same amount, so that at 20 psi boost, the fuel pump is pushing against 63.5 psi in the line and the flow rate declines. Test data I've seen shows they can slow up to 1/3rd at 25 psi boost. At high boost the flow from a 190 lph pump, might be reduced to 130 lph. This is still an adequate flow rate for 550 injectors. At 80% IDC, 550 cc/min injectors would use fuel at 124 lph.

 

[matthewdesigns]

Thanks for the additional info, Wret. I have a better grasp of what's going on.

OP, sorry for giving you some bad info here.

 

[dsm-onster]

the 190 is good to 400hp, and up to 30 psi. YOu will be fine, rewire the fuel pump for the extra little bit.

I know what you are trying to say. . . but to clear any misconception. . . The 190 is definately not up to the task at 30 psi for my setup. Boost, at best, defines flow arbitrary to the setup.

30 psi is 350whp territory to a stock 4g63 longblock an an evo3 16g.
30 psi is 500whp territory to a stock 4g63 shortblock and cam upgrade and t3 stage3 50-trim.
30 psi is +650whp territory to a stroked 4g63 and cam upgrade and PTE 6176.

The 190 is good to 400whp. But not at 30 psi. It's 190 lph flow number is at 43.5 plus atmospheric pressure. It lessens greatly as more pressure from the pump is required to maintain injector flow consistancy, which Wret discusses above.

 

[wret]

Here is some fuel pump pressure/flow data from stealth316.com:

Stealth 316 - Fuel Pump Upgrade Guide

 

[1G90AWDTsi]

I'm running 750s and will be installing a 190 lph rewired. A lot of guys say 255 but after a lot of research and convo, the 190 is sufficient.

 

[bowtiebuba350]

190 is fine just get a fuel presure regulator

 

[1G90AWDTsi]

I know what you are trying to say. . . but to clear any misconception. . . The 190 is definately not up to the task at 30 psi for my setup. Boost, at best, defines flow arbitrary to the setup.

30 psi is 350whp territory to a stock 4g63 longblock an an evo3 16g.
30 psi is 500whp territory to a stock 4g63 shortblock and cam upgrade and t3 stage3 50-trim.
30 psi is +650whp territory to a stroked 4g63 and cam upgrade and PTE 6176.

The 190 is good to 400whp. But not at 30 psi. It's 190 lph flow number is at 43.5 plus atmospheric pressure. It lessens greatly as more pressure from the pump is required to maintain injector flow consistancy, which Wret discusses above.

what about a fuel press. reg with the 190 lph?? Some say yes and others say no??

 

[dsm-onster]

Well some have problem overrunning the stock FPR. Some have not. That is probably why you get the mixed review. . . Now I know Walbro makes a 190LPH High Pressure pump. Perhaps this is the particular 190 that can overrun the FPR. The regular 190 is fine for an evo3 16g or smaller in potential.

 

[talonkid93]

so i have a set of 550 injectors on my 1g eclipse so my question is can i run a 190 fuel pump or do i have to run a 255 fuel pump

ull be fine with a 190 fuel pump im runnin 550 injectors and i have a walbro 190 in it and it runs great.

 

[91whiteGSX]

Hey whats up guys I was Takeing stuff off my car getting ready for the guy to put a new head on for me... and I took my Injectors out and there not blue like everyone else's ....So I looked at the numbers on it and it says B390L .... So I take it these are not stock 1991 GSX 5Spd Injectors huh... I Guess the kid before took them out and put these in... and when I got The car it ran... not good but it ran.. now I took my Turbo off and traked the numbers on that and came up small 16G off of a JDM Galant.. Now from what people say you need bigger then 450 To run any Turbo bigger then a stock 14B So I dont get why this kid would put these small ones on or he just wanted to beat me.. So now what should I do Look for 550 and higher or what?? Thanks guys!!!

 

[dsmconvict]

You could look for the 510cc yellow tops or just go with the evo 560's. Both are a cheaper alternative to buying new injectors. But ditch those 390's asap.

Chris

 

[sower23]

you should be good w/ a 190 but they are so cheap it is definitely worth just getting a 255 and save some time

 

[awesome_asim187]

is there anything else that anyone would have to do, besides putting it in?

 

[wret]

is there anything else that anyone would have to do, besides putting it in?

Oh, there's a lot more. You need to start by setting the mood.

 

[1G90AWDTsi]

Well some have problem overrunning the stock FPR. Some have not. That is probably why you get the mixed review. . . Now I know Walbro makes a 190LPH High Pressure pump. Perhaps this is the particular 190 that can overrun the FPR. The regular 190 is fine for an evo3 16g or smaller in potential.

What is the regular 190 vs the walbro? And if a FPR is needed, can a simple set up be good enough...something fairly inexpensive?