Went to the dyno need help ???

[wardog]

I need some advice i see that the last 2 dynos on the DYNO STICKY were done on stock 440's. I just went to the dyno yesterday and couldnt get lower than 13 afr with the followin mods what else do i need to tune the 440s ? Did u guys mess with afm screw?? any advice would be appreciated ....

ct26/60-1
k&n fipk
bic ddp + 3in exhaust no cats
spec stage 3
12 lbs flywheel
walbro 225lph
aeromotive afpr set at 42 psi with vac off
stock 440 s
bypassed dampner with braided line
2.5 hardpipes to stock intercooler
greddy rs to the atmosphere
lexus afm
hks evc 4 set at .80/ 11-12 psi
safc 2
fresh rebuilt engine and head less than 2000 miles with cometic mhg and arp studs to 92 lbs

 

[pimptrizkit]

looks like your running out of fuel.

bad pump, oild pump, fake walbro?

maybe your fuel pressure is to high..


i run my around 22-25psi with vac, with vac off it's around 33 or so, and + 10psi brings it to about 45psi under boost.

where your seeing 55-65 psi under boost..

 

[starscream5000]

Nah, he's not running out of fuel, although cleaned and blueprinted injectors would be a nice peace of mind to have. You don't want to unscrew the AFM screw with the A/F's already that lean, it would only make it worse. Increasing your fuel pressure should help to bring down the A/F's a little if I'm remembering right with stock sized injectors, but I'd rather see someone confirm this who has experience in that area.

 

[pimptrizkit]

wasn't saying he was maxing the injectors out just that the pump couldn't flow enough fuel at those pressures from what it looks like..

but towards redline, it richened up?


ohhh i see what your doing using the lex afm with out the 550's..

 

[starscream5000]

ohhh i see what your doing using the lex afm with out the 550's..

Damn, I missed that as well until I just read your post.

Take a look at your A/F ratios, that is the main reason why many do not suggest using the LEX AFM in tandem with stock 440's.

 

[jtran8]

+1 , beside that he didn't say anything about cleaned 440cc injectors . He might still using those 18 years old dirty 440cc injectors .

 

[dbsupra90]

i posted a reply in the dyno sticky, but i'll respond here too.

can you monitor fuel pressure? is it rising 1:1?

where did you buy your walbro?

yes, you need to drill the plug cap over the screw on the lex afm and take it in when running 440's.

what are your settings on the afc?