How many pounds boost 5psi , 15? what?
what year, what engine, nobody can answer this , lacking hard facts.
forced induction is not that simple.
you need to control AFR under boost, and retard the timing.
that means knowing exactly what you have now ,EFI wise?. if it even is. Is itr a CARB engine?
read Greg Banish
books sold on amazon first , then hack.
or you will fail, (melted pistions,bent rods)
they made lots of picks, some with CARBs. back when.
surely you know the year , the exact model and what engine is there.
that be like first , hacking the spark and fuel systems.
1972 to 2002.?
ippon is 88 to 2002
see here for all PUhttp://en.wikipedia.org/wiki/Isuzu_P%27up
which car, what year , what country.??????????
17 engines, even a diesel.
we are clueless to what you have.
Try 5psi , more will likely bend rods.
The first trick is to find out of your stock MAP sensor can do the boost you are using. if not that is FIRST.
IF the engine is MAF based, then same question.
a way to increase AFR, use a linear progressive fuel regulator.,and a fuel pump that can do max required fuel under full boost.
have a plan for spark retard.
have a plan for engine ping (knock /detonation) Use a aftermarket knock sensor. to do this automatically.
The best way is custom ECU.
2nd best or worse is piggy backs. (it\'s a pray thing)
The plan is to have a fail safe system that cuts spark , if engine knocks or fuel pressure goes low. for any reasons (a new fuel sensor added)
that the nut shell all covered in Banish books or Jeff Hartmans.
can your stock injectors do your unstated level of boost.?
the ippon page lists all these engines. a bunch !
2.2 L 115 hp (85 kW) I4
2.3 L 4ZD1
2.6 L 4ZE1
2.5 L 4JA1-T
2.8 L 4JB1-T td
3.0 L 4JH1-T
3.1 L 4JG2-T
3.1 L LG6 V6
3.2 L DOHC V6
now to attempt and answer, not knowing what engine or ignition option
the ECU has what is called and Ignitor output.
what you need , at the minimum is to interceed this pin.
to the spark coil. (s)
and then delay that by X amount, under boost.
a piggy back does that
a new ECU does that (tables)
or a sold dedicated, spark delay box , just for boost. (any)
if you buy the ECU, new. the first will be, boost levels.
then caculations of required fuel at full boost
and matching injectors.
then tune it from scratch.
that is the best way.
the other way is attempting to fool a stock ECU;.
good luck with THAT.