http://kak.com/camaro/mustang.jpg
http://kak.com/camaro/injectors.jpg

While I was racing a mustang (first pic) my injector rate was at 91% and at other times flooring it, it has gone to about 96%. I also have a tune that has the injector rates set at 25.38 and 24.91 is normal. It looks like I need new injectors, whata do you think? Also, is 320 Airflow in grams per second decent for 5925 rpm? I think if I go above 6200 that Ill starve the motor of fuel

 

I dont see an AFPR in your mods, as I understand it a little increase in pressure can help you avoid buying bigger injectors. BTW, how do you like that datamaster? I really cant read it from your link once it loads.

 

ditto

by reading this post you hereby agree to mailing that maf for me

 

Wouldnt an AFPR just be a bandaid? If I can get some more views on this I will try it! My fuel pressure is 36 PSI at idle...

How much HP am I losing right now? (Maxing out injectors and 3-5 degrees of knock retard)

 

Is that fuel pressure reading with the vacuum line disconnected? I am still running the factory injectors with the 306, but my fuel pressure is set at 60 psi so they are like 30#. I haven't had a chance to take any Datamaster readings after the dyno tune to see what my duty cycle is.

I would say that you could get an AFPR to get by for a while if you don't want to spend the money for new injectors.

 

No, why would I unplug my fuel pressure vacuum line?

Your sure that the PCM will totally compensate for the 60 psi in open and closed loop and the WOT cell?

 

[QUOTE]Originally posted by Rodrigues
[B]No, why would I unplug my fuel pressure vacuum line?

Fuel pressure readings are generally discussed with the vacuum line disconnected. It is like a standard. Different cams will have different vacuum at idle possibly affecting the reading.

 

Ahh.. I still need to do that I guess. Now my main question is: 1.) Do I actually have a fuel problem, if so is it bad? 2.) Should I get bigger injectors? 3.) Should I skip injectors and get a AFPR?

 

seeing how an AFPR is like $125 and injectors can climb over 300...

 

You can get FMS 30#'s used for like $175... is 92% duty cycle really even that bad?

 

The PCM doesn't know that the fuel pressure is at 60 psi because I have changed the injector constant so the PCM thinks the injectors are approximately 30#.

What were your O2 readings when the duty cycle? Have you had the car on a dyno with wideband O2?

I have been running on the factory injectors at 60 psi for about 2 years, but plan on switching them out for 42# this year because of nitrous. I don't want the injectors to lock up.

 

my o2 sensors were steady around 940 mV, from my understanding thats very rich. My injector rate right now is 25.38 lb/hour in the pcm. So to balance out the higher fuel pressure you just increased the injector rate? That sounds like a better deal . What exactly did you set your injector rate with 60 psi of fuel pressure?

 

I'd vote for new injectors also, 30# SVO stuff is cheap and readily obtainable. If you dont program in the new injector flow rate, with a regulator or new injector setup, your BLMs will shift and this affects WOT calculations as well.

93 cars can use the regulator differently than we can.

 

From what I have shown you, do you think I NEED the injectors with a 92% duty cycle at 5900 rpm? I plan to go to 6200... I dont think I actually hit 100% yet, but what would happen? What happens past 80% that makes the injectors "unstable"? I have a feeling its something about the fuel atomizing proporly, but I just want to make sure.

Would I feel more power than I am now with 30# injectors?

 

Heres the log I ran

http://kak.com/camaro/car.uni

I started racing the mustang at #rec 2304-2344