I made 337hp with them... but I want to know what was safe I'm going back to the dyno and I'm lowering the boost so I shouldn't make more then 300hp and I was wondering if that close to maxing out?

 

are u using an FMU? or stock fuel pressure.

with stock fp 440's max at around 315'ish at 80% duty cycle.

 

AEM EMS with a AEM FPR idling@50psi

 

Their are a lot of injector calculator's on the internet.
I calculated 400whp with 55 psi and 550cc injectors 85 % duty

 

I wondered about this myself awhile back... it would seem that at a reasonable duty cycle (80-85%) the max whp on 440cc injectors at factory fuel pressure seems to be aound 300-325whp, prob mostly dependant on bsfc...`

 

so 300-315np I should be fine?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 9psiTurboSI &raquo;</TD></TR><TR><TD CLASS="quote">so 300-315np I should be fine?</TD></TR></TABLE>

As long as you or your tuner is comfortable with the AFR and injector DC then there's no reason to spend the dough right now, but if you plan on upping the boost later on, then bigger squirters would be a wise investment. When you dynoed the 337 what was the A/f ratio?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbopimp &raquo;</TD></TR><TR><TD CLASS="quote">
When you dynoed the 337 what was the A/f ratio?</TD></TR></TABLE>

Basically 12:1 a/f... Richest point was like 11.6:1-11.8:1 and leanest point was 12.5:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 9psiTurboSI &raquo;</TD></TR><TR><TD CLASS="quote">

Basically 12:1 a/f... Richest point was like 11.6:1-11.8:1 and leanest point was 12.5:1</TD></TR></TABLE>

If your 440's were good for 337whp at ~12:1 afr, then I don't see why they wouldn't be good for 300 whp if that's the goal. If you want to lower the duty cycle you could always bump the pressure up a bit.

 

Thanks

 

no thanks