im running 550cc injectors with a AEM fuel rail, and adj. FPR on my LS.. im using the S-AFC controller and i turned down the duty cycle on the injectors -50% (max) and im still running really, really rich.. my apexi turbo timer says its running 10:1. any possible ways to lean it out some more?? would hotter spark plugs work? and the ign. timing is advanced too.

 

im using BKR7E's right now.. maybe go up to a 6 or run the stock LS ones??

 

any idea how much whp will 550cc will max out ?

 

I could be wrong but from what i've read you needed to use 440cc or lower with the hack. Due to the fact you can't lean out more that -50 on the VFAC.

Also from what i've read 550cc injectors will support anywhere from 300-350 depending on tune and rail pressure. I would say 350 would be kind of pushing it.

Hope this helps
GL

 

yea, i think i need to go down to 440s cause im on -50% on the SAFC and its still rich as hell

 

with the afc setup your supposed to run 450's

if you wanna keep the 550;s turn your rail pressure down a bit. still recomened to get the correct 450's though


platinum.

 

50% of 550cc is 275cc.....stock injectors are 240's. try turning down the pressure to about 40psi with the line off the fpr....better yet ditch the fmu and afc and get something like uberdata or crome for free before u blow that thing up from running ridiculous amounts of timing from over manipulating the map singal just to get your car to run normal on those injectors

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Day Walker &raquo;</TD></TR><TR><TD CLASS="quote">any idea how much whp will 550cc will max out ?</TD></TR></TABLE>

325hp at 80% duty, and 55 psi rail pressure according to rc's injector work sheet.

rc engineering injector worksheet





Modified by boostedcivicsir at 12:59 PM 10/28/2004