0project dc2

iTrader: (1)

im workin on my friends civic its an 89 civic Si hatchback. with a D16Z6 swap, runnin the Non vtec ecu and a RPM switch, with homemade turbo kit with 14B TURBO, INTERCOOLER, 2.75 inch edxhaust. 3 inch exhaust no cats . open atmosphere wastegate, DSM 450's and file to fit;'s chip . its runin lean when i checked the plugs they're lookin white. how is this possible ?? fuel pump cant hold up >?>??

lazy bum shaughn

Is it a stock fuel pump? How much boost are you running?

LEON

I doubt it's the 450cc injectors... mine are pushing 278whp at 70% duty cylce.

fsp31

How do you know it's running lean? A/F guage? Do you have a fuel pressure guage? It would be interesting to see what fuel pressure does at WOT. If it drops then the fuel pump is your problem. Even at 55 psi 450cc injectors should provide plenty of fuel.

I have a T25 on a D16Y8 with stock fuel pump, 450cc injectors, and filetofit's circuit. I'm not running lean now, but I did do some adjusting. That little circuit allows for a pretty huge range of adjustability. About as much as an AFC in my opinion. However, I checked the plugs after a few days and they were white. Now I've switched to the NGK BCPR7EY-N-11's. They're 2 steps "colder", so the white look should go away. I think the combustion temps are going to go up on a boosted motor no matter what and my other plugs were just too close to the action so they were going to turn white whether I was running rich or not.

0project dc2

iTrader: (1)

no fule pressur gauge, i just checked th eplugs and thhey were wite soo i was considering it was running lean and just wondrieing how is fiile to fits circut adjustable ??? i see the little pots but can i adjust more fuel using those ???

since it was running lean .. i figured i'd just uncap the fuel pressure regulator so i get more fuel pressure in there. but when i did that the damn car ran wierd .. no power and lots of hesitation.

filetofit

Do you have the 2 pot or the 3 pot circuit? It is very helpful if you have a voltmeter while tuning. Your key on, engine off voltage input to the circuit should be about 2.9 volts and the voltage output of the circuit to the ECU should be about 1.9 volts (key on, engine off). That's about where I set them when I send them out and that corresponds to a -35% cut in fuel. Turn the screws on the pots an eighth of a turn at a time and watch the voltage. A higher voltage output means less of a cut, means you are throwing more fuel into the engine for any given MAP.

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iTrader: (1)

i believe it is a 2 pot circut .. if i twist these pots .. doesnt it mess with idle cut also ?? it doesnt really change or compensate for RPM signal right >? alaso do i turn clock wise or counter clock wise . or does it not matter .. and what wires do i connect to ?? thanks !!


[Modified by project dc2, 2:38 AM 1/16/2003]

0project dc2

iTrader: (1)

isnt that where the AFC hack basically ends before it throws a code ?? for exmaple i cant really make it go -30% cuz it might throw a code ?

fsp31

>>for exmaple i cant really make it go -30% cuz it might throw a code ? <<

It depends on your boost level, which corresponds to the amount of voltage sent to the ECU by the MAP sensor. If you boost to high for the -30% value to compensate, THEN you get a code.

Here's my lame interpretation:
Before you went turbo, your map sensor never saw more than "zero" boost. Zero boost corresponds to the maximum voltage reading from the MAP sensor that is acceptable to the ecu. If your ecu sees a higher voltage reading, it throws a code. That's where the "hack" comes in. If you put something in line (filetofit's circuit) that interferes with the map sensor voltage, you can run a certain amount of boost. This setup works with 450cc injectors because while they are much larger than stock, the ecu is seeing 30% less manifold pressure than is actually there, but the larger injectors compensate for the reduction. If you reduce map sensor voltage by around 40% that corresponds to about 11 psi. That's why people say you can't go beyond 11-12 psi with the "hack".

I'll let Filetofit explain how the pot's work. He knows this stuff about a thousand times better than I do...

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iTrader: (1)

i heard the 89 civic Si fuel pump only flows like 90 LPH and htas only good for 330CC injectors or somethgin ?? can someon verify this ?

0project dc2

iTrader: (1)

bump