LS325ci

iTrader: (1)

ya thanks. I think i misunderstood the calculator. I though it was whp and not bhp.

makes perfect sence, I actually like mine around 80-85% IDC

kbracing96

iTrader: (26)

SD 60's are rated at 43psi fuel pressure and are actually 72lbs a the 58psi these trucks run at. I made about 800rwhp with them on 15psi of boost in my old truck. The AM340 fuel pump was maxed out and the injectors where close but got the job done.

LS325ci

iTrader: (1)

thanks for the reply. this actually made me search around for the flow rate.




and I think I see why people think this isnt capable?



Does anyone have a flow rate of this injector at different pressure?

according to this one vendor.
Siemens Deka 60 LB High Impedance Fuel Injectors EV1 (8)

at 43psi = 60lb
at 87psi = 85lb

now since i cant find a chart of the 60, for the time being im going to pretend that its linear ( .56818lb per psi )(dont know if it is or isnt.)
(yes im aware it is static flow = 100% duty cycle)

so let say we start at 58psi

58psi = 68lb

PLUS 15 psi (lets not forget boost reference regulator add 1:1

73psi = 77lb


so the flow is there. Perhaps some may not be aware that boost reference regulator add 1:1?

since i am running a return setup with boost reference regulator it looks like it would flow enough for what I need.






If anyone have flow chart of 60lb please feel free to post them
thanks

Ferocity02

iTrader: (59)

I'm running 60/72# injectors at 3/4bar and have been up to 14psi and I think at most 65% duty cycle. But I'm also injecting a 50/50 mix of meth/water at 15gph (7.5gph of methanol) total which provides a significant amount of the fuel.

Atomic

iTrader: (42)

Slow down chief...you can relate flow ratings by difference pressures by multiplying the flow rate by the square root of the pressure ratio...for instance, if you want to know the 4 bar rating of your 60lb@3bar injectors it is 60*(4/3)^.5=69.28, or 60*(58/43.5)^.5=69.28.

Secondly, pressure across the injector does not increase with a referenced regulator, it stays constant. 15psi of boost means the fuel rails has to increase by 15psi so the pressure across the injector stays the same.

For more information, read this:https://www.performancetrucks.net/fo...p-flow-510434/

Short answer is, at 15psi of boost 60lb@3bar injectors with a walbro400 and boost reference regulator will support 730rwhp on pump gas.

LS325ci

iTrader: (1)

thanks for the awesome link and that equation. I always wondered how to pick base fuel and now it all make sense (assuming im understanding it right)

So I was completely mistaken on how boost reference regulator work, thanks for correcting me. Now I see that its to counter act the pressure inside the manifold.


Im attaching a pic since im a fairly visual person. so lmk if I did this right.
This is a flow of a walbro 400 btw that I found online and I graph a 60lb flow



After graphing the flow of a 60lb injector, it can indeed flow 70lbs no problem at 60psi base pressure. Not only that but it looks like it has about up to 25 psi(boost) to play with.

and will flow 75lb @ 70psi base pressure, but only about 10psi of boost to play with.


with that said. as stated already It looks like THIS particular combination can support 700whp no problem but at about 85-90% idc depending on other factors.


Interestingly enough the pump size matters a whole lot once you start pushing it up there. no wonder people are giving me different answer. Without taking into account pump flow one cant really say the limit of the injectors.

I mean looking at how much the pump flow at 12v theres no way it would support 70lb without leaning out fast. (just using 12v flow as an example as thats like a flow of smaller pump.)

so yes if your using a smaller pump youll be max out much sooner than someone that has a bigger pump.


any correction or inputs welcome.

please correct me if I made a mistake somewhere better now than later when I have the set up ready to rock.

thank you

Atomic

iTrader: (42)

In that link above you can download the spreadsheet I made in the first post and use it to make basically the same graph as above. Makes it easier to try numbers and I have several pumps and configs in there.

SYRacing

iTrader: (2)

Like others have said just do the 80s....it will give you room to grow.

You do realize that E85 would absolutely shine with your setup and not require any meth right?

LS325ci

iTrader: (1)

im usually open to setting up for room to grow, unfortunately this car wont have any room to grow. im not a fan of making big numbers just when i dyno or do 1/4 mile so i would have to set up the whole car to handle more power as a dd. and thats where it gets really costly (new aftermarket diff, built t56, build up 5.3) to start. So IMO theres no point of setting up for more when the whole drive terrain will need an upgrade too.

on that side note. Do any one here DD their 700whp+ trucks/car?

seems quite excessive once you start crossing over 600whp for street car.

ya e85 is awesome stuff, unfortunately I used one on my previous dd, I dont see it being worth the trouble anymore. it was nice but I always have to plan out my commute to avoid running out of gas. I use the car pretty much everyday so filling up in the same station becomes a hassle IMO. If more station come up then ill reconsider.


thanks I was actually using that one at first until i realized it shows flow of double pump. im using a single one. so it didnt quite make sense to me to plot it in there.

Atomic

iTrader: (42)

The first chart in the spreadsheet is for single pumps...