fuel setup for B16A running 7-8psi

WEPN R · 31st July 2002, 12:31 PM

I was just wondering what kind of fuelling is necessary to run 7-8psi boost on a standard engine. running 2 extra injectors
Do I need a upgraded fuel pump inline or intank?
A new ajustable fuel pressure regulator, maybe malpassi rising rate? or is the standard one still ok?
What do you think is required? any good brands of fuel pumps with associated costs

turbozxi · 31st July 2002, 04:55 PM

A boost dependent regulator is not the best way to add fuel when talking 7-8psi,
Airtex make a good pump inline can support 400hp I use one its loud but pretty good CDL autoparts about $250 .I get trade prices there though. What are you going to use to add the extra fuel a Turbo link ? if so two injectors will do about 20cm before the throttle body, I use 3 200cc injectors and they are ample.
You won't need a new regulator if going this route perhaps not the fuel pump its more of a safety measure.

v8vtec · 31st July 2002, 10:23 PM

boost dependant regs are there to maintain the pressure difference between the injector and the intake runner.
This is to help the example of when you have 30 psi fuel pressure and 30 psi boost in the runner, then the fuel will not leave the injector!!! :evil: :evil: :evil:
the injectors infront of the tb do two things, first they help to cool down the charge by absorbing ambient heat, and they make the air more dense.
This is not a big hasstle in Hondas as they use map sensors, so the density is not as big a deal.
But to place the injectors near the tb to me seems to be a little agricultural, and besides, isnt that what a carburator does? Better to do it properly with a computer and bigger injectors.
If you need more psi from your fuel pump, then it will flow less fuel. Seems strange, and I struggle to get my head around it, but you are better to get a pump that exceesd your needs

turbozxi · 1st August 2002, 06:44 AM

Its all money though your talking standalone territory big dollars but certainly better, those extra injectors do work fine. I thought a boost dependent reg kind of sensed boost and then add extra fuel pressure so when the injectors opens they inject more fuel and that this is how some people choose to add more fuel, when boosting. I probably am wrong here though.

WEPN R · 1st August 2002, 07:17 AM

yes I plan on running a turbo link to control the auxilary injectors and also retard the ignition under boost, I do realise a full standalone engine management is a better solution but due to the restraints of my budget this is not an option at this stage. I seems like i will have to invest in a larger fuel pump and dont worry about the pressure regulator yet.

Turbozxi, dont you think 20cm from the throttle body is a long way down, is this so the air and fuel mixes better, Ive seen alot of setups running extra injectors plumbed just before the throttlebody????

turbozxi · 1st August 2002, 04:43 PM

Yes exactly Air/fuel mixes alot better this way, sounds like you are going for a turbo link then? They have the features you need check the trade and exchange should be able to pick one up for about $500 don't need the hand controller unless you think you can tune it yourself. Also get high impedence injectors above 9 volts or else you will need a resistor box made for the link to drive em. Oh and link also sell a device called the clamp link its stops your map sensor from seeing boost so you don't get a check light and limp mode, about $90, torque performance sell em and install em. I paid about $6oo for tuning and installing the turbo link. Torque Performance are the best tuners for Links in Auckland or NZ IMO. Hope this helped.

31st July 2002, 12:31 PM	#1 (permalink)
WEPN R Member 700rpm (Idle) Join Date: May 2002 Posts: 94 Location: Auckland	fuel setup for B16A running 7-8psi I was just wondering what kind of fuelling is necessary to run 7-8psi boost on a standard engine. running 2 extra injectors Do I need a upgraded fuel pump inline or intank? A new ajustable fuel pressure regulator, maybe malpassi rising rate? or is the standard one still ok? What do you think is required? any good brands of fuel pumps with associated costs

31st July 2002, 10:23 PM	#3 (permalink)
v8vtec Member 700rpm (Idle) Join Date: Mar 2002 Posts: 88	boost dependant regs are there to maintain the pressure difference between the injector and the intake runner. This is to help the example of when you have 30 psi fuel pressure and 30 psi boost in the runner, then the fuel will not leave the injector!!! :evil: :evil: :evil: the injectors infront of the tb do two things, first they help to cool down the charge by absorbing ambient heat, and they make the air more dense. This is not a big hasstle in Hondas as they use map sensors, so the density is not as big a deal. But to place the injectors near the tb to me seems to be a little agricultural, and besides, isnt that what a carburator does? Better to do it properly with a computer and bigger injectors. If you need more psi from your fuel pump, then it will flow less fuel. Seems strange, and I struggle to get my head around it, but you are better to get a pump that exceesd your needs __________________ The boys get older, the toys get more expensive!!!

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31st July 2002, 04:55 PM	#2 (permalink)
turbozxi Senior Member 7,000rpm (Peak Power) Join Date: Feb 2002 Posts: 4,248 Location: Auckland	A boost dependent regulator is not the best way to add fuel when talking 7-8psi, Airtex make a good pump inline can support 400hp I use one its loud but pretty good CDL autoparts about $250 .I get trade prices there though. What are you going to use to add the extra fuel a Turbo link ? if so two injectors will do about 20cm before the throttle body, I use 3 200cc injectors and they are ample. You won't need a new regulator if going this route perhaps not the fuel pump its more of a safety measure.

1st August 2002, 06:44 AM	#4 (permalink)
turbozxi Senior Member 7,000rpm (Peak Power) Join Date: Feb 2002 Posts: 4,248 Location: Auckland	Its all money though your talking standalone territory big dollars but certainly better, those extra injectors do work fine. I thought a boost dependent reg kind of sensed boost and then add extra fuel pressure so when the injectors opens they inject more fuel and that this is how some people choose to add more fuel, when boosting. I probably am wrong here though.

1st August 2002, 07:17 AM	#5 (permalink)
WEPN R Member 700rpm (Idle) Join Date: May 2002 Posts: 94 Location: Auckland	yes I plan on running a turbo link to control the auxilary injectors and also retard the ignition under boost, I do realise a full standalone engine management is a better solution but due to the restraints of my budget this is not an option at this stage. I seems like i will have to invest in a larger fuel pump and dont worry about the pressure regulator yet. Turbozxi, dont you think 20cm from the throttle body is a long way down, is this so the air and fuel mixes better, Ive seen alot of setups running extra injectors plumbed just before the throttlebody????

1st August 2002, 04:43 PM	#6 (permalink)
turbozxi Senior Member 7,000rpm (Peak Power) Join Date: Feb 2002 Posts: 4,248 Location: Auckland	Yes exactly Air/fuel mixes alot better this way, sounds like you are going for a turbo link then? They have the features you need check the trade and exchange should be able to pick one up for about $500 don't need the hand controller unless you think you can tune it yourself. Also get high impedence injectors above 9 volts or else you will need a resistor box made for the link to drive em. Oh and link also sell a device called the clamp link its stops your map sensor from seeing boost so you don't get a check light and limp mode, about $90, torque performance sell em and install em. I paid about $6oo for tuning and installing the turbo link. Torque Performance are the best tuners for Links in Auckland or NZ IMO. Hope this helped.