KA24DET 370cc injectors - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

IchigoFace · 12-04-2002, 01:33 AM

tomorow ill be installing my 370cc drop in replacement injectors in my ka24det. im really scared when it comes to messing with fuel. any pointers for this install. i kno its really straight forward. just take em off and put the bigger ones in. but those injectors are a b*tch to remove and install.
when its all done, how will it feel? how is the idle? how is the mpg? these are probably dumb newb questions but please help.

Tyler Durdan · 12-04-2002, 01:05 PM

Suggestions for fuel work....remove the fuel pump fuse, disconnect the negative battery terminal, and smoke outside the garage pretty far from the car.  If the injectors are from an sr, or 90-96 300zx n/a, they will be side feed.  Aftermarket companies are generally top feed and require a custom fuel rail.  As far as mpg and erractic idle, I wouldn't worry about.  I don't think the idle would really change, but I haven't done the 370cc, so someone else probably knows.

*Jeff240sx* · 12-04-2002, 01:39 PM

Erratic idle, MPG, and how it feels will all depend on your tuning.  If you stay with stock tuning, you will run rich, flood during idle, and get about 30% less miles per gallon.  If you tune with the AFC (did you get that installed yet?  if not, I would wait on the injectors,) you will need to adjust everything down about 30% and drive to a dyno.  Then you can really tune, and you won't have an erratic idle, wont feel like flooding, and will not get any worse gas mileage that it should.  You will, of course, use more fuel due to more horsepower.  Tips, listen to the guy above.
-Jeff

240racer · 12-05-2002, 09:44 AM

I had the 370's in for a week or so before I got the AFC put on.  The idle sucked, hardly drivable.  I had to turn it up and play with it all the time.  Also, I got about 16mpg.  at full throttle they are fine, I don't notice it running richer.  Anyway, I have my preliminary settings at -25% at 1000rpm and -37% at both 2000rpm and 3000rpm.  I calculated 37% as the difference in fuel.  I haven't run at the dyno yet, so I don't know what it will be after it's tuned.  Jeff240sx, would you mind sharing the settings that you have.  A word of warning, don't take his settings as correct, each car is different and that's why we have an AFC so we can tune.  
I am just wondering if the car gets lean at high rpm. I'm running like 7-10psi and I have the stock pump right now, but will have the walbro 190 when I get the car back out.

*Jeff240sx* · 12-05-2002, 10:42 AM

Sorry.  I don't have an AFC yet.  I know that 37% is the difference in fuel, but that will give you the exact same flow rate as the stock injectors, which are dangerously lean anyway.  I have always been the person to advise running a little richer as a precaution.  
I don't quite know when I will be getting into a dyno.  When I do, I will tell my settings to people that have some sort of common sense (you, not a newb with a turbo) cuz I would feel terrible if someone took my advice and grenaded their car.  Incidently, that's why I advise people to run a little rich.
-Jeff

12-04-2002, 01:05 PM	#2
Tyler Durdan Zilvia Junkie Join Date: Feb 2002 Location: Don't mess with Texas Posts: 546 Trader Rating: (0) Feedback Score: 0 reviews	Suggestions for fuel work....remove the fuel pump fuse, disconnect the negative battery terminal, and smoke outside the garage pretty far from the car.  If the injectors are from an sr, or 90-96 300zx n/a, they will be side feed.  Aftermarket companies are generally top feed and require a custom fuel rail.  As far as mpg and erractic idle, I wouldn't worry about.  I don't think the idle would really change, but I haven't done the 370cc, so someone else probably knows. __________________ "Pure adrenaline attached to a license plate.  Isn't it time to experience one yourself?"                           -Dan Gurney Turbo for Sale

12-04-2002, 01:39 PM	#3
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	Erratic idle, MPG, and how it feels will all depend on your tuning.  If you stay with stock tuning, you will run rich, flood during idle, and get about 30% less miles per gallon.  If you tune with the AFC (did you get that installed yet?  if not, I would wait on the injectors,) you will need to adjust everything down about 30% and drive to a dyno.  Then you can really tune, and you won't have an erratic idle, wont feel like flooding, and will not get any worse gas mileage that it should.  You will, of course, use more fuel due to more horsepower.  Tips, listen to the guy above. -Jeff __________________ Whatup?

12-05-2002, 09:44 AM	#4
240racer Zilvia Junkie Join Date: Nov 2001 Location: Minneapolis, MN Age: 46 Posts: 574 Trader Rating: (0) Feedback Score: 0 reviews	I had the 370's in for a week or so before I got the AFC put on.  The idle sucked, hardly drivable.  I had to turn it up and play with it all the time.  Also, I got about 16mpg.  at full throttle they are fine, I don't notice it running richer.  Anyway, I have my preliminary settings at -25% at 1000rpm and -37% at both 2000rpm and 3000rpm.  I calculated 37% as the difference in fuel.  I haven't run at the dyno yet, so I don't know what it will be after it's tuned.  Jeff240sx, would you mind sharing the settings that you have.  A word of warning, don't take his settings as correct, each car is different and that's why we have an AFC so we can tune.   I am just wondering if the car gets lean at high rpm. I'm running like 7-10psi and I have the stock pump right now, but will have the walbro 190 when I get the car back out. __________________ Adam '89 coupe KA24DE+T 14.1 @ 104 MPH '88 Celica All-Trac turbo stock, but no more ecu codes!!

12-05-2002, 10:42 AM	#5
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	Sorry.  I don't have an AFC yet.  I know that 37% is the difference in fuel, but that will give you the exact same flow rate as the stock injectors, which are dangerously lean anyway.  I have always been the person to advise running a little richer as a precaution.   I don't quite know when I will be getting into a dyno.  When I do, I will tell my settings to people that have some sort of common sense (you, not a newb with a turbo) cuz I would feel terrible if someone took my advice and grenaded their car.  Incidently, that's why I advise people to run a little rich. -Jeff __________________ Whatup?

12-04-2002, 01:33 AM	#1
IchigoFace Join Date: Oct 2002 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	tomorow ill be installing my 370cc drop in replacement injectors in my ka24det. im really scared when it comes to messing with fuel. any pointers for this install. i kno its really straight forward. just take em off and put the bigger ones in. but those injectors are a b*tch to remove and install. when its all done, how will it feel? how is the idle? how is the mpg? these are probably dumb newb questions but please help.