Hi folks,

I am finally getting around to installing the intercooler I have had for the last 4 years in my car and wanted to ask the experts here on what fuel upgrades I am likely to want to do to support the new mod level.

The car:
93 w/ 4XK on the chassis / motor
Stock motor / ports
Efini y-pipe (coming out with intercooler)
stock twins / ported wastage
Apexi PFC w/commander
m2 cold air intake
M2 large
downpipe
High flow cat
racing beat dual tip

I am not shooting for crazy power - just fun, useable power for the street (e.g. 10lbs of boost). I was wondering whether I would need to upgrade the fuel pump, upgrade to larger injectors, etc.

I'd also like thoughts on whether the PFC with stock solenoid would provide adequate boost control.

Thanks! - Phillip

 

My goals are similar to yours and I plan on the following:

-Supra fuel pump
-"bored" 1300cc secondaries

This is good enough to around 400rwhp or so. As far as boost control, for most the PFC does an OK job. For me, I installed two manual boost controllers and bypassed the solenoids. This gave me much more stable and adjustable boost.

 

Fuel pump at the minimum. I think your stock injectors will be fine at that boost with stock ports/turbos. If you up the boost past 10 and delete a cat with a straight pipe id consider primary 850s to be safe.

 

Yeah you'll be alright, I have more or less the same mods, the only thing is I have a supra pump with stock injectors. At 10psi you shouldn't see more than 80-85% duty cycle on the injectors

 

With a Fuel pump (Nippondenso, Walbro) and keeping the turbos below 10psi your setup will be fine. If you want to step the turbos up a bit then your looking at the Power FC at that point.

I ran around last year at about 12psi with the Nippondenso pump and the Power FC with no problems on the stock fuel system.

 

at 10 psi with that setup you can retain the stock injector and rewire the fuel pump(effectively upgrading the fuel pump since it will push more fuel with more voltage and is far more reliable than using the stock fuel pump relay system and ~40feet of electrical wiring for the fuel system in the stock setup. throwing in an upgraded fuel pump still does not eliminate this issue).

 

Stock injectors are fine as others have said and fuel pump upgrade.