this is my first dyno... notice how ******* high the afr is! that was on the hack with -35 all the way across...
this is after i set my safc to 0 all the way from 5200-8000...still SUPER lean ...so basically even if i add the fuel, the thing still runs SUPER lean. what could the problem be? do you think it could be fuel pump? or maybe my timing? what the **** could make my car run at 17-1 afr???

 

whats ur fuel setup?

 

i'm just running 450cc injectors and a safcII...thats it for fuel.

 

u need either an intank highpressure fp or inline hp fuel pump...

 

looks like you answered your own question.
It looks like your stock pump is running out of flow. I'd say upgrade it to a 255lph intank walbro/holley and you should be good to go.

 

well...heres my setup....
b16a with gsr cams...stock everything else
450 dsms
safcII
garret t3/t4
tial wastegate
modified ssautochrome manifold
running 9psi...
its in a 1991 integra, so i guess maybe the pump might be goin bad because i heard most stocks pumps can support 12psi...

 

also, do any of you think that this could be too much timing? I believe i set everything correctly, but i am not sure of the exact timing...and i know the hack tends to advance timing....so could this be a timing issue? oh and in case anybody asks, there was NO BOOST SPIKE...

 

are you running an fmu?

 

nope...just the hack (safcII and 450cc injectors...)

 

Just checking all the bases, I know you said you are running the straight AFC hack, but are you running a missing link or similar device? If so get rid of it. From the looks of the AF curve, I'm sure you don't have one, but it can't hurt to ask. Also, when was the last time the fuel filter was replaced? If that is not the problem, check the fuel pump and the settings on the AFC (the initial settings like 4cyl and throttle up and right prs sensor 6 in 6 out etc)

 

yeah, id have to say that its your fuel pump. if youre gonna get the walboro pump, make sure you get the low pressure one. they make a high and a low. if you get the high, your stock fuel pressure will be at 50+ even if you have a b&m fpr. i know cus it happened to me. or you can get a 190lph fuel pump.

 

yah, i am not running any check valves or missing link...i have never replaced the fuel filter, but i've only put 3000 miles on the car...idk about the previous owner. so you guys really think its the fuel pump? do any of you think the timing could affect the afr in this way? i really dont want to change out the pump only to find out it was my timing all along...DA's are a pain in the ***, i have to drop the whole fuel tank to get to the pump.

 

just checked the spark plugs...they actually looked alright...a little gray, but no debris on them, which i guess means no detonation...which is good.

 

I'm shocked that motor is still in one piece.

Also... fuel pumps don't support X-psi, they support X-horsepower.

 

yah, i was suprised as well...the motor still runs really strong...again, fuel pump? or another problem? can anyone tell for sure what it is?

 

stock fuel pumps have gone to/past 350whp...
unless yours is going bad, that's probally not it

i would say ditch the hack and go with a tuned ecu via uberdata soon though.....the hack ***** up timing horribly

 

350 whp? HA! not by itself they havent or without an FMU or something...
with the hack the fuel pump cannot keep up.

 

Joseph Davis was telling me about it, and said that he's seen it time and time again

hell, i knwo a couple of local kids that went boosted and ended up running 550's and stock pump to a little over 300whp with NO problems at all

 

I'm sticking with a "fuel flow" problem. wether it be a clogged fuel filter restricting flow at high rpm's or a stock pump not being able to keep up with the fuel demands of the engine. Either way you look at it, a higher volume pump is a good investment, it's a safety precaution, and sense of security.
I'm betting on the pump being the culprit, and if you change it and the problem is still there, well I'm sorry that you now have a pump installed thats capable of handling what it was intended for. Not a stock pump trying to support twice the hp.
If the fact that you have to drop the tank is keeping you from installing one, quit being lazy, it's a lot less work then pulling a motor and rebuilding it.

 

Make sure you get a new fuel filter man.

 

stock fuel pump can definately take a beating... not sure about 350hp number though.

I have seen 450's, afc, and stock fuel pump work fine for lower 5-8 psi of boost.

fmu and stock pump is a big no no though.

 

Would you rather have a motor blow up, or waste $75 on a pump. It looks like the motor is running out of fuel in the upper rpm's, so you might as well start with the fuel pump.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by m R g S r &raquo;</TD></TR><TR><TD CLASS="quote">Would you rather have a motor blow up, or waste $75 on a pump. It looks like the motor is running out of fuel in the upper rpm's, so you might as well start with the fuel pump. </TD></TR></TABLE>

Couldn't have said it better.

 

well it looks like right when vtec engages, the afr just starts shooting up...i'm gonna change out the pump and see if it helps...but again, does anyone think timing could be the culprit?

 

I said I have seen people do things as what I described and have no problems at lower boost with stock pump... I run an aftermarket pump too cause it was cheap and I needed the fuel.

I was replying to the comments that say the stock pump is not able to keep up with fuel demands... I simply stated my opinion on the capabilities of the stock pump. Something else seems to be an issue imo although the pump could be it and it a cheap enough upgrade (usually stockers just **** the bed very abruptly if they fail).

no doubt the pump is a good place to start and I would definately upgrade, but I should have elaborated that you should also be checking of fuel filter for restriction and whatnot other possible issues related to the problem... the pump should be able to flow enough.