There is a fuel injector calculator here: http://www.injector.com/injectorselection.php

I can't find a calculation that really makes sense there though for boosted cars even with a higher BSFC number. I played around with stock injector sizing and BSFC numbers for turbocharged car, and used what I gather as the maximum power we can see before 100% IDC however most injector MFRs do not recommend exceeding 80% etc. Seems like a complex arguement.

 

I've used RC engineering's calculator to find my BSFC for my car by matching up what my car makes on the Drift Office Dynojet with my IDC's from the dyno pull.

I use a BSFC of .61 as that has always correlated with my data.
330whp, 347whp, 480whp, and 538whp dyno charts... my dynojet numbers match with my IDC's and the .61 BSFC.

According to the RC Eng Calc that I've correlated and tested quite accurately

880cc injectors will make 465whp @85% IDC's
780cc injectors will make 412whp @85% IDC's

880cc injectors will make 545whp @100% IDC's **
780cc injectors will make 483whp @100% IDC's

**That's to say you have the fuel pump to back it up!!!**
A walbro will not support 545whp on 880's @ a boost level over 30psi

How do I know? Because my 1000cc's are running out of room running c16 and making 540whp. I'm at 94-97% PEAK IDCs on a single walbro.
************* TO CLARIFY THIS IS WITH THE STOCK FUEL PRESSURE REGULATOR 43.5PSI ***************************

 

Is your walbro modded?

 

The fuel pump is a non issue because we will be using a double pumper for this power level. You are NOT using the calculator correctly because you are not changing the fuel pressure at the rail to reflect the boost needed to make 600whp. Your calculations above are at base FP, try changing that # to 77 to represent 34 psi of boost pressure.

 

Furthermore, your 880s will be spraying 1177cc at that rate due to the rise in FP

 

YOU NEED TO LEARN HOW A FUEL SYSTEM WORKS!!!!!

Call me... I'll explain it to you. OR YOU CAN READ MY POST

541 980 6022.

 

I respect the arguement! Believe me I know how a fuel system works. Let me give you my REAL world scenario. I went 10.69 @ 135 in 2003 in a 3300 pound 1G DSM with 680s with an external Aeromotive fuel pump which is equal in flow to todays double pumpers. The way you are figuring it out this wouldnt be possible....so Ive been there and I will do it again in my Evo.

 

I'll believe that you could do that with a base pressure of 75-80psi. When you're in boost though your fuel pressure will be higher than that... 30psi of boost = 110psi of rail pressure.

JUST IN CASE YOU'RE COMPLETELY MISSING THE POINT
With a STOCK FPR @ 43.5psi BASE PRESSURE
NO METHANOL injection
880's will not in gods green earth produce 600whp on ANY FUEL.

If you disagree... it's not your differing opinion it's your lack of intelligence. Regardless if you ran a 10 in your 1st gen DSM... YOU'RE STILL WRONG.

 

For the record... warp9... you're wrong. You need to realize this.

 

So in this arguement since I disagree then that shows a lack of intelligence Surely you jest....
Start a new thread, and educate yourself son. Then when youre done you can PM me that I was right

 

You can paypal me money and pay me for taking you to school. You should read what I've written and figure it out.

 

Just buy 1000CC guys and call it a day.

 

Ill teach you a thing about street knowledge...books are for reading and kindle

 

*Puts on flameproof vest*

1000cc with a modded pump max out (right before going static) at 606whp corrected on our DJ. This was a reported 108% IDC according to EvoScan, and we know that around 113 they go static. 880s would likely be at around 525-530whp at the same reported IDC on our dyno I would think.

I will go back through my logs, but I think that was 12.20 out the top so it was borderline even then. Keeping it a level I know I have total fuel control (574=97%) would drop that number to around 500-505 if they flowed completely linear compared to the 1000s I used.

I know my math isnt perfect but I think its reasonably close. Then again it was also on a year old walbro so who knows if a freshy might make a difference or not.

 

Was it hard wired?