RX7_FD3S_JDM

Right guys i have my remap booked for the 17th of march (time to pull my finger out).

The engine spec is:

FD3S - stock twins - converted to poor mans non sequential.
Apexi Power FC with commander
Uprated intercooler with 3" inlet/outlet
3" intercooler piping
HKS sequential BOV
Manual boost controller set at around 12-13 PSI
3" downpipe
3"decat
3"exhaust!!
Large intake trumpets with ITG filters
Stock injectors & fuel pump (as far as im aware).

I have purchased a fuel pressure regulator and would like to know how to install it.

Q1. Is there a write up thread somewhere for the FPR install? (i cant find it).

Q2. What pressure should i set it to with the above mods?

Q3. whats the maximum pressure i should set the MBC to for mapping? 14-15 PSI?

Q4. I currently have 3" intercooler piping, is this too big creating lag, should i go smaller?

Thanks.

Any help/advice much appreciated

an old pic of the IC/piping for reference

DaleClark

iTrader: (55)

Hate to say it, but that's the WORST intercooler install I've ever seen. That thing isn't getting any airflow.

You need to put money where it needs to go first, like a good ducted stock mount intercooler. And do something about that stock AST.

Dale

pito13b

iTrader: (3)

Intake looks pretty interesting as well.

Edit: Read the trumpets have filters.

RX7_FD3S_JDM

Thank you for this most unhelpful post. As I said this is an old pic and the IC is now v-mounted. I also have a vented bonnet.

RotaryEvolution

iTrader: (30)

you only mentioned it was an old pic. you did ask for advice, stop showing everyone what buttons set you off with tiny amounts of criticism.

your FPR should have installation instructions, if not, go to the manufacturer's website.

there is no max setting for boost(except limited by the detonation rating of the fuel and tune), but ideally you stop pushing once you stop getting power gains from increasing boost, or you hit your target power level.

lag from larger IC piping is generally an urban myth.

zeroG

iTrader: (28)

Relocating that same intercooler doesn't really do anything without propert ducting and airflow.

If all you did was turn the IC a bit to make look more vertical, then it's not helping anything

You should provide some pics and more details of what your current actual setup is

RX7_FD3S_JDM

Set me off? lol!

Thanks.

I will be installing the RRFPR tomorrow and am still slightly confused.

I beleive the stock fuel pressure at idle is around 38 psi?

i am running 13.5 psi boost. what would you recommend i up the fuel pressure by? I was thinking along the lines of setting it to 43 psi at idle?

a

thanks

ttmott

iTrader: (1)

You need a Datalogit to set it up correctly; that is if you are going to do it. The commander does not have the access to certain features and analysis capability to get the job done.

I chucked the fuel temperature sensor and replaced it with a pressure transducer and feed the output to my Datalogit. You will need this data if you are moving to an adjustable fuel pressure reg. There is a tuning balance between fuel pressure and duty cycle of the injectors.

arghx

iTrader: (3)

A new FPR with the stock fuel pump seems like a waste. I would switch out the pump.

RX7_FD3S_JDM

okaaaaaay.

what i was actually trying to find out is... how much fuel pressure can the stock fuel pump handle?

is 57 psi ok?

ttmott

iTrader: (1)

38.4 is nominal regulated pressure. The pump is capable of up to 106 psig, in fact I think the FSM requires the pump be capable of71 to 106. Remember, however that just because pressure is higher doesn't mean flow is higher. There is a pressure / volume curve. The regulator will give a proportional rising rate based upon rise of manifold pressure. So, if you are looking at 20 PSIG boost the fuel pressure will be 58.4 PSIG. That doesn't mean when the combined injectors are flowing 4000 cc/min (if they are that large) the pump can accommodate such a flow. This is why, as I said earlier, I log fuel pressure to validate the pump can maintain the system pressure (read that as volume) at high injector duty.