EG-SIXV-TEC

BTW. happy new year everyone,

i got a question my side ride is a D15z1 engine and i got CAI,hedders, cherry bomb, im going to install a D16 Vtec intake manifold this weekend.

The intake manifold,-throttle-body-fuel injectors, rail etc. is hella bigger than the D15z1 one will it make a lot of difference if i adjust to add more fuel than just running it.

I got a adjustable fuel reg. and how do i know how much to adjust it to??
Which way is easier to know what fuel psi to adjust to
__________________________________________________ ________________________________________________
I got this from the B&M adj. FPR instructions
Most factory computers will
compensate for minor airflow
modifications (low restriction intake
and exhaust) at part throttle operations
but have no way to adjust at WOT
(Wide Open Throttle). The results are
a lean mixture right where you need
more fuel! One way to correct this is
to adjust fuel flow via fuel pressure.
Most people don’t understand that by
increasing fuel pressure (on a fuel
injection system), fuel flow increases.
The formula for calculating flow
increase based on fuel pressure is:
F1 = Injector Flow (cc/min)
P1 = Current Fuel Pressure (psi)
F2 = New Injector Flow (cc/min)
P2 = New Fuel Pressure (psi)

P2=P1x (F2/F1)2

example:
We added a high flow exhaust that
increases airflow 5%. What pressure
should the system be set to?

F1 = 270 cc/min
F2 = 284 cc/min (270 + 5%)
P1 = 43 psi
P2 = 43 psi x (284/270)2
or
P2 = 48 psi

or whats the easiest other way to formula-ly do this i got this from B&M instructions?? will adjusting make difference?
Thanks

Gunmetal_B20_Hatch

iTrader: (9)

You dont need an adj. FPR on a engine with the mods you have done...

I dont really understand why you would even throw money into a Z1...

EG-SIXV-TEC

i just want to see if what i can do with some of my other spare parts around, i know that its useless but im trying to see what i can do with it, it's my side ride

will adjusting my FPR to add more fuel will do anything???
I still want to adjust it but don't know what to set it at???

Gunmetal_B20_Hatch

iTrader: (9)

1) waste more gas... You dont need any extra fuel.
2) You need a fuel pressure gauge.

Sean @ ESG

iTrader: (1)

FPR is uneccesary. The car's OBD would adjust to any type of air/fuel change related to D16 manifold.

thumper64

If you want to start playing with stuff like that, chip the ECU and run Crome. Get a wide band O2 sensor and start datalogging. That's the cheapest way of tuning and actually being accurate. Get an Ostrich and a laptop, or a chip burner. When you get bored, you can use it with another car.

The parts to chip the ECU are fairly cheap, I think it was under $5 for everything to chip the board, not including shipping. It's the emulator that's like $170 and the wide band that's expensive, but you can find the wide band sensor for like $50 on eBay and get the gauge from another seller and make the whole deal a little cheaper.

I think it's kind of pointless trying to make more power on a Z1 because of how it's built, but it could be educational, so good luck.

Linked

when you take your car to a tuner shop to get dyno'ed

do they use their own wideband and chip burning hardware?

Sean @ ESG

iTrader: (1)

Yeah, if you pay them to tune it on the dyno as well.

EG-SIXV-TEC

so its okay then no need to adjust the FPR, from 1.5L intake manifold to 1.6L manifold

so if i adjust the FPR to add more psi the computer will still compensate for the more added fuel? will it work best doing so if i chip the ecu, is it possible to run a 1.6L vtec computer and slap it on the D15z1 harness, also i heard that the D15z1 comes with the Wideband o2 sensor with five wires or so is it true.

Gunmetal_B20_Hatch

iTrader: (9)

Keep all of the Z1 items including the OEM FPR. Manifold swap is fine, but isnt going to make a noticable difference. 1-2whp at the most.

EG-SIXV-TEC

what if i use the d16 vtec intake manifold do i need to replace its FPR with the D15z1 one??