im still confused about the jrsc kit

1 it comes with the FMU does it differ between b16 and b18c5?
2 it seems like the kit doesn't come with injectors im assuming its meant to be used with stock injectors and upgraded fuel pump that comes with the kit.
but I see a lot of them have rc injectors

3 people seem to need to lower the coolant temps. is it better to use lower temp thermostat or add water wetter to coolant? stock radiator.

does the pulley size matter for the fmu that's included or does it go by manifold pressure and add fuel based on the PSI?


it will be tuned on Neptune and bigger injectors.

but for emissions it has to run on stock itr ecu so I can use the obd2 data port to take emissions NO TAILPIPE TEST.

I was going to turbo but found a great deal on complete jrSC kit so I will be putting that on instead. I think it will do good for a daily sedan
just not sure what needs to happen when emissions comes around

 

Dont think it differs for b16 or B18c5 its meant to be used with stock injectors/fuel preasure. It doesnt come with a fuel pump, iv had a brand new D series JRSC and B series JRSC brand new out the box and they never had a fuel pump.

Those with after market injectors dont use the FMU and are tuned on a EMS.

The JRSC creates lots of heat soak, the cooler the air temps the better. Adding a fluid like water wetter to your radiator will help keep your coolant cooler and aids the engine in keeping cooler.

The FMU is going to base its fuel preasure by the manifold preasure created and compensate the fuel you need. So yes if you run a smaller pulley making 12 psi of boost and the fmu is setup for only 6psi your going to F something up.

Your best bet is either keep your stock injectors and jrsc pulley on and tune it so when its time to smog you can put the FMU setup and stock ecu and smog and then take it off and put your EMS back in and go. Or put your injectors and everything back on for smog. Is that your main concern?

 

ok that's good. I have the stock itr pulley
and everything else is stock
im pretty much trying to do the minimum. not looking for squeezing every bit of power out of it. less maintenance better lol

 

raverx3m,

1) No difference between FMU's included in any JRSC kit except for their factory preset fuel pressure setting... which can be changed, so one cannot assume it is set properly.

2) "B" series JRSC kits do not come with either fuel injectors or a fuel pump... these would be optional for the end user. Since programmable engine management has become the standard to tuning these kits safely, I suggest you have both.

3) Lower coolant temperatures might be a consideration if your particular car runs unusually hot... however, it is best that the thermostat opens at a minimum temperature of 180'F. I suspect that this will not be an issue for you since you reside in the NW.

The FMU raises fuel pressure at a ramp rate of 5:1... that is 5psi of fuel pressure for every 1psi of boost signal. The static setting is typically right around 60psi, so counting on the FMU to properly deliver fuel to the engine at elevated boost pressures is a bad bet. Let's say you are running 10psi of boost... this means that at full song, the FMU would be trying to deliver about 110psi of fuel pressure (60psi static + (5psi fp x 10psi bp))... and most fuel pumps begin losing dramatic levels of fuel volume after 75psi pressure when the internal bypass valves open.

Since you intend to tune with Neptune and larger fuel injectors... the FMU is generally not used... certainly if you have large enough injectors to fuel the engine by themselves anyway. Anything larger than 440cc at conventional fuel pressures should be sufficient.

The day before you go to test for smog... swap the stock injectors back in along with your ITR ECU, zip-tie the bypass valve open (or exercise great restraint and stay OUT of boost), and go test and get your sticker. When you get back home, put the big injectors and Neptune back in and go have fun.

 

^