Injector capacity

[Graham]

Anyone know the formula to convert injector capacities from cubic centimeters (cc) to pounds per hour LB/HR?

I'm buying injectors for my car, and different companies list thier injectors differently. Thanks, Graham

[Udrivecrap]

i found this :D

http://www.robietherobot.com/Storm/fuelinjectorguide.htm


Conversions
500cc per minute is approximately equal to 49lbs per hour which is equal to approximately 100hp.
lbs/hour = cc per minute / 10.5
lbs per hour = HP / 2.04
cc per minute = lbs per hour x 10.5
cc per minute = HP x 5
HP = cc per minute / 5
HP = lbs per hour x 2.04

[ArchangelX]

My brain hurts.

[spike109u]

Make it easy on yourself, and use this (http://www.witchhunter.com/injectorcalc1.php4) converter. No math involved. :D

EDIT: How did you get a score that high in drifting! :shocked3:

[REH]

Here's something that may be useful to ya Graham. I had to search for this in my files.

FORMULA FOR ENGINE FUEL INJECTOR SIZING


(HP x .5) divided by (# cylinders x .8) = Injector size

[Udrivecrap]

EDIT: How did you get a score that high in drifting! :shocked3:

you can practice in the parking lot....

don't stop drifting and use as much of your time as you can.

if you stall or don't continue to drift, the points start over.

at least, thats from what i've observed.

i'm gonna try to beat his score. :D

[Graham]

Lets see. So if I'm shooting for around 350hp
I think that the .8 in that equation is because the highest safest duty cycle of an injector is 80%, hence .8
So:
(350 x .5) = 175/(4cyl x .8) -> 175/3.2 = approx. 55.

I assume that that means 55lbs/hour, which would seem about right
Using the converter, that works out to be 577cc/min

While we're on the subject of injectors, does anyone know the performance differnce of high impedence vs. low impedence injectors? I know that impedence is simply a fancy way of measuring the resistance of the injector, so the circuit and ECU would have be different depending on they type, but is there a performance difference?



Thanks for all the info.

The secret to a high score in the drifting flash game is to do doughnuts. I used the "minimal" car. Theres some spots on the track where you can just keep doing doughnuts without going off the track or going through a judging gate thingy. I like the second half of the corner on the bottom right of the screen. Do doughnuts for as long as you can, and then just finish the run.

[Udrivecrap]

hehehehehe....:D

[spike109u]

How did you get a score like that? Almost every time I came close, I got a negative score instead of a positive one. How did you get around that glitch?

[Udrivecrap]

umm, i'll try to explain to the best of my ability :patriot:

here we go......on the first green dot, drift into a circle, then at the top circle again, come down, circle again, small drift left then right, then circle again.....on the second green dot circle again, come down circle again, make the turn and circle two more times before the sign and the next turn. circle in the turn and before the oil slick, circle again below it (if you didn't run out of time)...then haul azz to the finish before 30 seconds is up. don't hit anything and don't let too much time pass between drifts or the score will not stay in the 200,000 range per drift. that last score i made was with the x-box car.

how was that? :D

[spike109u]

I understand what to do; I've been moving as fast as I could, and then doing donuts at the end. My problem is that doing donuts will give me about -800,000 points instead of +800,000. I'm not sure why it happens, but it does almost every time I try. I can grab a screenshot if you want to see what I'm talking about.

[ArchangelX]

Wow...didn't realize that it was that technical. Amazing. :gapteeth:

[spike109u]

Here's what I mean by a negative score. :shakesfist:

http://img.photobucket.com/albums/v245/spike109u/Misc/NegativeScore2.jpg

[ArchangelX]

Well, it's a flash game, so it's not computer specific...it's obviously something you're doing? Hmmm.

[Udrivecrap]

ok that's your problem, you are trying to rack up points at the end. you need to start with the doughnuts from the first green dot.....and don't go around and around. seems like the counter goes forward and hits a point where it goes backwards...... i think its cuz you are trying to cheat. :D

hahahahahahaha......j/k

i'll try that snap shot thingy to give you an example of what i did.

[Udrivecrap]

ok...sorry it took so long to find a free snapshot download :yeah:

http://myspace-363.vo.llnwd.net/01520/36/31/1520221363_l.jpg

on the second doughnut (near the top of the 1st turn), the counter went negative. i stopped just after 16 seconds on the clock, that's the x-box car with the middle upgrade tires.

i think there was 10 doughnuts total on that 1.3 score....it was all before the oil slick and running very close to 30 seconds....so the last 3 turns were useless and a dash to the finish. :beatup:

so that's how it went down. :beer3:

[Graham]

You CAN get a bunch of points by just doing doughnuts in one place. Thats how I got my score. If the car goes off track, the score goes negative, and if the car goes between any of the "judging points" or whatever while doing a doughnut the score goes negative. I got my score by doing doughnuts a the end, just like spike


By the way, how did a post about injector capacity lead to this? lol..

I guess its is "advanced technical discussion"...its just about flash drifing.

[Udrivecrap]

hahahahaha.... i dunno how that happened. :D

[spike109u]

EDIT: How did you get a score that high in drifting! :shocked3:

I guess I'm good at derailing threads. :grin:

[CrazyHawaiian]

While we're on the subject of injectors, does anyone know the performance differnce of high impedence vs. low impedence injectors? I know that impedence is simply a fancy way of measuring the resistance of the injector, so the circuit and ECU would have be different depending on they type, but is there a performance difference?

Out of the two, low impedence would be considered better in a high power application. When the injectors get bigger (to flow more fuel), whatever they use to control the flow (depending on type) also becomes bigger, and this affects how fast the injector can control the flow, this is sometimes called trigger time. So if the trigger time is crappy and the control of flow is slow (high impedence), its gonna affect idle and throttle response. So to get the trigger time quicker/better people run low impedence injectors. They use like 3-4 times as much current or something, thats why the trigger time is better. But the downside is this creates more heat, not only from the extra current but also because of the way the injectors are pulsed (peak and hold). On top of that the ECM will usually require more hardware, extra circuits, etc.

This is some stuff I learned on my project of swapping a GMC Syclone/Typhoon ECM into one of my Camaro's and successfully re-tuning it to support 14psi. Turns out the Sy/Ty ECM has an extra injector driver, and with more mods the setup can support 8 low impedence (peak and hold) injectors. So with that I'll be able to max out my fuel pump capabilities and still be able to hold a smooth idle.

:smileydavid:

[ikeyballz]

hey crazy hawaiian, ot i know, but were you parting out a white camaro before? blown bottom end? i think i might have met you cuz i was gonna go buy a fender to put on my bird. turned out it didnt fit or something..