was talking to a vendor on the phone today about random crap

42 x 2 = 84

84 x 4 = 336

60 x 2 = 120

120 x 4 = 480


20-21 msec is static. if these numbers confuse you, one should not be modding a vehicle. they all play into each other, they all mean the same thing. it's a rough idea, but it's close enough to spark some interest

 

my brain hurts....

 

Thats why i pay other people to do it.... lol

 

Are you thinkin of 2 per cylinder to hit that 480?

 

nope, it's a rough calculation per cylinder, single injector set up. i may refine it here in a bit for people.

random findings come up to this. at 300 kpa {test pressure} 42.5 lb/hr injectors will support 86.5 hp per cylinder.

86.5 x 4 = 347.2

i will keep digging to see what i can find out for sure. im basing all of this off of 58 psi rail pressure.

 

23!!

 

 

soooo...you need 87ish lbs injectors to support roughly 350hp?

for the record, I didn't understand the first post either until you further explained it all.

if I'm still wrong...I will delete this post before any of you read it

 

nope
i left the numbers vague for a reason. it is a rough idea to show what the injectors can flow. this does not come into play with returnless systems, and other factors that can skew the final outcome. this is just a basis. what the injectors themselves can support in terms of horsepower.

 

I'm good at math and I want to tune cars.

Why are you just using a rough guess? Can you provide actual numbers for this? Possibly for your car or something?

 

well, the problem being, every calculator out there on the web has it's own formula behind it. which is why it's vague at best. i posted this for the simple reason, people think that just because the IDC {injector duty cycle} that see in hptuners is the end all number. not so. what they are overlooking, and i see this every damn day is the milliseconds. 20.0 is static, stuck, engine go blamo. what happens when you're tuning a car for 60's. it hits what we know as the "perverbial" wall of hpt. the end of the flow rate calculators and all that fun stuff. there is a certain car on here who is being tuned by someone i know in the north east. his car just started dumping fuel. it outran all of the tables, and then just started puking fuel.

some people may look at this and wonder what the hell im getting at. well it's simple, the turbo guys know this, or soon will hit this wall and wonder what the hell is going on. simple. the calc tables are not scaled high enough to give an exact control, hence why gm does not run a stock style ecm in any of their drag cars.

which brings me to another idea. is hpt limited due to the ecm, or limited to the level of things that wee cracked and opened up? im not sure if anyone here has played with efi live or not, or had a chance to see how far the tables are scaled too. i do know there is differences in each program, but they both have the same end results.

if anyone wants to step in an go into more detail, or make corrections, feel free too. i expect to be corrected for any mistakes. we are all here to learn!

 

Is that to the crank power? So with a good tune you can use 42s for alot longer then what people are saying? Perhaps jumping to 60 isnt quite as nessisary as people think?

 

Don't forget, we run a returnless style fuel system. Sucks *****.

 

Oh i must have missed that!

 

ive been sayng this for a while, not this way, but that the 42lb injectors are alot safer than people are thinking. GM wouldnt do offer a kit that according to alot of members on this forum should blow up the car. Im talking about stage 3.

 

Wouldn't something like the Aeromotive Digital Fuel Management Unit be able to cure most of those problems? Then, returnless wouldn't suck as much *****. Although you would have to shell out $600 for the fmu.

 

But what will changing to a return line style with a 255 walbo do for this?

 

27???

 

Is your "proverbial" wall the 8g/sec max that can be put into HPT for IFR? I thought the flow rate modifier allowed us to get passed that. actually i see your talking about more precise control instead of just using a multiplier

maybe custom OS could extend some of the stock tables? Could the ecm handle even larger tables?

I think im way outta my league here. lol

 

I may be incorrect, but i believe it allows for Adjustable Fuel pressure and even fuel distrubition to all 4 cylinders.

 

why 58 ? our fuel pump is 56 you can go the the gm website to get that , or am i mixing something up

MATERIALS
Block: cast aluminum with cast iron cylinder liners
Cylinder head: cast aluminum
Intake manifold: aluminum
Exhaust manifold: cast iron
Crankshaft: forged steel with induction hardened fillet
Camshaft: cast iron
Connecting rods: forged steel
Additional features: high pressure ( 56 psi ) fuel pump
extended life platinum spark plugs
extended life coolant
electronic throttle control
Individual coil on plug high energy ignition

 

58 is the pressure in the rail. I have no idea what the actual pump pressure is.

 

actually I read that wrong

sounds like you're stating that 42lbs injectors can support more than we think

 

to a degree. remember, this is running ***** out retarded, much like i am right now

measured at the rail by several people on here, and in the redline world. hence why i stated 58

 

That's not sounding good for your sex life. Hopefully you are not making calculations while your ***** are out.

So on a less serious note what type of flow do you calculate for running 275hp/cyl?