I want to see if some one can help me out. my current setup is an h22a1 with a t3/t4, tial wastegate with 8psi spring, blitz bov front mount ic, 12:1 fmu,aem fuel rail, apexi afc-vtec and currently have 4 check valves to the map sensor. My problem is that as soon as my throtle position is at like 50% or more my a/f goes all the way to lean and the car bogs but if i keep the throtle at less then 50% my boost goes to 7lb like nothing i hear my wastegate opening and everything with no problem, so does any one know whats going on?

 

are you on stock fuel injectors??im not sure as to what your problems are, but if you are running the stock injectors, they would already be maxed out at that boost level... if i was u i would ditch the FMU, and V AFC, and move up to some fuel management like hondata anyway though..

 

Yeah, it's probably your injectors maxing out. If you don't have $ for a Hondata you can do a decent job tuning it with the VAFC (and a wideband O2), but Hondata or Uberdata gives you the advantage/safety of tuning the ignition as well.

 

He's running a 12:1 FMU, it's not that the injectors are maxed out. Notice, there is no fuel pump in his list....

 

It has nothing to do with the injectors maxing out. Get a real fuel setup and get the car tuned. Lose the riser and get bigger injectors (550's) and use the "AFC hack" until you can afford something better. God help your motor.......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sharkcohen &raquo;</TD></TR><TR><TD CLASS="quote">He's running a 12:1 FMU, it's not that the injectors are maxed out. Notice, there is no fuel pump in his list....</TD></TR></TABLE>

he can either go with a walboro or an inline one

 

so then u guys think I should get rid of the fmu? and as far as a fuel setup I heard of hondata but how does it work and as far as right now if i don't use bigger injectors and with out the fmu what would happen? also if the map reads boost besides getting a check engine light what else happens as far as getting fuel cut or something else...

 

Well, for one thing, it appears you are not running an aftermarket fuel pump to support the ultra high fuel pressures produced by a 12:1 FMU during boost. If this is indeed true, it is why you are leaning out past a certain amount of boost. You will destroy your engine doing this.

Yes, you should get rid of the FMU and instead run large injectors and programmable engine management. I highly recommend that for now you stop boosting on the motor, you are going to blow it up.

 

Ah, from your post in the turbo thread I see I am correct, you are running your stock fuel pump. This is why you are leaning out. The stock pump is incapable of delivering fuel at the pressures you are subjecting to it. I'm not sure if you understand what a 12:1 FMU does. '12:1' means that for every 1 psi of boost, the unit raises your fuel pressure by 12 psi. So during boost you are seeing fuel pressures over 100 psi. Your stock pump will not flow fuel at these pressures, which is why you are going lean during boost.

You have options. You could get a high pressure pump. You could dump the FMU and instead run large injectors and some form of electronic management, either a VAFC and run the 'hack', or get something more sophisticated, like a programmable standalone.

Whatever you do, stop boosting on that car until you get things working properly, or you are going to lose that motor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teamitr &raquo;</TD></TR><TR><TD CLASS="quote">so then u guys think I should get rid of the fmu? and as far as a fuel setup I heard of hondata but how does it work and as far as right now if i don't use bigger injectors and with out the fmu what would happen? also if the map reads boost besides getting a check engine light what else happens as far as getting fuel cut or something else...</TD></TR></TABLE>

if your map sees boost, it will be in limp mode

get hondata asap

 

what is limp mode?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teamitr &raquo;</TD></TR><TR><TD CLASS="quote">what is limp mode?</TD></TR></TABLE>

safe mode.......6500 rev limit, no vtak

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sharkcohen &raquo;</TD></TR><TR><TD CLASS="quote">
Yes, you should get rid of the FMU and instead run large injectors and programmable engine management. I highly recommend that for now you stop boosting on the motor, you are going to blow it up.</TD></TR></TABLE>

wurd

 

are you on stock fuel injectors??im not sure as to what your problems are, but if you are running the stock injectors, they would already be maxed out at that boost level... if i was u i would ditch the FMU, and V AFC, and move up to some fuel management like hondata anyway though..