Hey, iam trying to find either a website or someone who know what my injector flow rate is.
Iam trying to make the calculation for BPW since iam making a custom chip.
I got a 383, and iam running a rochester tbi 17087005, i've found alot of neat stuff but nowhere can i find injector flow rates.
If someone could either get me the flow rate that would be great, i'll have to post some pics soon of this crazy setup i got

 

GM part # needed...

 

So is BPW one number that can be changed that will allow the computer to know that more fuel is available?

 

Well i got the bpw # figured out... and well the bpw is a mathmatical calculation of the injector size and the size of your engine, so basicaly it will increase the amount of fuel or decrease the amount of fuel without having to play with your VE tables...BPW=Base (injector)Pulse Width

 

I have the .bin for my ECM loaded into TunerPro.

BPW constant is 135 for the 350 program. I'm assuming that's 13 psi and 61 lb/hr injectors.

If fuel pressure is upped to 17 psi, that will give me 1.3 times the fuel.

1/1.3*135= about 104. Does this mean that I'd want to run a lower BPW constant for more fuel pressure rather than a higher one?

Is the BPW constant a linear increase in fuel across the board?

 

The increase in flow is the square-root of the pressure change. For the stock fuel pressure I tend towards 11 psi. Only because it is in the middle of the 9 - 13 psi accepted service pressure (although there are times I use 11.5 psi to be conservative).

Using that as the base for the 61#/hr rating, increasing the pressure to 17 psi is:

New #/hr = sqrt(17 / 11) * 61

= 76 #/hr

The BPC/BPW value is a displacement vs. injector flow term. A lower value will cause a lower final injector PW.

RBob.

 

So to get 100 lb/hr I need 30 PSI of fuel pressure with 61 lb/hr injectors or ~19 with 75 lb/hr and that means a TPI fuel pump or similar.

Will my turbo city adjustable regulator allow me to adjust to 30 PSI once I install the TPI fuel pump, or will I have to use the 94-95 fuel pressure regulator?

By your calculation...

61 / 76 = .8. Do I take the stock BPW (135) and multiply it by .8? 135 x .8 = 108? Can I use that as a raw setting for BPW until I adjust from there?

 

check this out... very handy...http://www.users.bigpond.net.au/ben_...ctorsizing.xls

 

Stan Weiss' - Electronic Fuel Injector (EFI) Flow Data Table

this should help

 

OK, I have converted a 87 iroc camaro to run a Vortech S/C on a 749 ECM. I put 42 lb injectors on a TPIS manifold. I finally got Datamaster to datalog this through a moates autoprom. Since I don't have Datamaster registered, I can't record. I will try to explain what it is doing.

Don't really explain knock counts They are saying 65000.. Since they can't be over 240 I don't understand. They stop cycling at cruise speed or at idle. If I hammer it they climb fast. (REAL FAST)

I know I had to adjust F29C VE closed Blade 1st to get rid of the rich condition. My BLM is staying around 125 with that.

I have been watching my S-Term and it is varying from 120 to 160. I don't really know if this matters or not.

That is another problem all in its self. But now I looking at the datamaster log file and found something real weird.

MAP which is @36KPA @1800 cruising.
TPS .71
Spark Advance 34.1
S-term at 135
L-term at 128

I don't think it learned AFR that is why L-term was at 128

Does anyone have an idea as to what might be going on with this?



Right around 1700 rpms my BPW jumps from 3.8 to 31.74 and my Inj DC jumps from 3.8 to 91.2
I found a few times at around 3050rpm my BPW was 31.74 and Inj DC was 161.3