I'm just gonna be running a Greddy blue box for FM to the time being. What kind of results have people had with these and what there limits are? How big of an injector can you run with them or what? I'm only gonna be using a IHI RHB5 VF snail for now so I won't be pushing huge amounts of boost so I'm not too worried about it not performing up to it's duties. Now say if I got a bigger(hell anything is bigger than what I have now ) turbo, bigger injectors(310's) built up the bottom end abit and cranked the boost up alittle. Now your probably saying if your gonna do that then why don't you just run like uberdata or chrome or any tuning program and burn a new fuel map program for your setup. I'm just wondering what it's limits are to how much it can handle. Any experiences or knowledge of it?

 

I've ran mine up to 12 psi, stock timing, pump and injectors. I don't recommend it.

I'd say 10 psi with an upgraded fuel pump and 2 degree dizzy retard on stock injectors.

 

Did anyone have any thing upgraded that wasn't normal OEM stuff like bigger injectors or bigger fuel pump and using the bluebox? If so did the bluebox just compensate for those and not have to manually tune anything or did you still have to tune it with like a adj fpr or s/vafc?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egizzle6 &raquo;</TD></TR><TR><TD CLASS="quote">Did anyone have any thing upgraded that wasn't normal OEM stuff like bigger injectors or bigger fuel pump and using the bluebox? If so did the bluebox just compensate for those and not have to manually tune anything or did you still have to tune it with like a adj fpr or s/vafc?</TD></TR></TABLE>

*sigh*

The blue box is a little device that throws your injectors into open loop when the MAP sensor detects boost. so even on a stock fuel system, at, say, 5 psi, your A/F ratio is in the low-mid 10's because you're flooding the motor with fuel; at 8-9 psi, your AF ratio is leaned out to a more respectable ratio (i.e.: 12.5:1) since you're pushing more air through the turbo.

Bigger injectors (like 290cc prelude injectors or RC 310's) can be used with the blue box to support fuel above 10-11 psi, and an upgraded fuel pump is recommended regardless whenever you up the boost from stock levels.

There is a lot of debate regarding whether the VAFC can work in conjunction with the blue box. most say no, some say they've gotten it to work for them.

Another way to tune the blue box is to adjust your base fuel pressure slightly. i.e. I have a B&M Commandflo FPR and that allows me to adjust fuel pressure according to how much boost I'm running.

 

Thanks. That helped me out alot I wasn't really sure what the bluebox really did besides just increasing fuel based on boost but never knew any of that which you said.