DIY Fuel Ct Defender

[micha118833]

I've searched on google for this and found results but not for a 4g63. I don't really see the need to pay 150 bucks for a FCD if I can make one a lot cheaper. while I'm good with electronics if someone out there has a good schematic for a FCD that works for this engine then that could save me some time and money. So does anyone have a schematic?

 

[grothe3297venge]

Call me crazy but, why do you need a FCD?? Thought only vehicles with MAP's that only read to 100kpa (no boost allowed basically) needed FCD's??

If fuel cut is the issue, how are you controlling those larger injectors? I see nothing in any sort of tuning (according to your mod list). Also get a wideband, this will help more then your light display.

 

[micha118833]

well have a factory boosted car that has been modified and boosts a lot more the it should. I think FC hits around 17# and with this turbo and wastegate I'm looking at more like 25# so when I hit the gas it doesnt fuel cut on me

 

[grothe3297venge]

Like I said you don't need an FCD, you need something to control your air/fuel because I bet your running hog rich. You need to get a SAFC or better yet get DSMlink. DSMlink is obviously miles ahead of an SAFC, but to get it running somewhat better then you have it now, before you blow your engine, do what you can .

In the mean time, crank your MB all the way down and stay out of boost until you find a way to control your injectors.

 

[micha118833]

No, I need a FCD, I'm not running hog rich and when I'm ready to start self tuning I will more then likely go with ECU+. But for the sake of keeping this thread about what it is about I'm looking for a schematic for a DIY Fuel Cut Defender for a DSM, not other things I should hook up instead of what I'm asking for

 

[VelocitàPaola]

One of our site sponsors sells FCD's for ~$50: Fuel Cut Defender (FCD) - SymTech Laboratories

 

[micha118833]

thats pretty cheap as compared to other prices I've seen

 

[Cdc1221]

Poor car

 

[micha118833]

ahhh the car isn't currently being driven. everything is being done in phases. there are more mods to the car than listed but none for tuning yet. like I said when I'm ready for that I'm leaning towards ECU+ unless I can find something that fits me better and in a good price range for me. and as far as the blinky gauge goes I didn't put it in there, came with the car like the BOV and the boost gauge. But at least I can tell if the car is running rich or lean just not as fine tuned as a wide band. more will come I just can't shell it all out at once

 

[T is for TURBO]

well have a factory boosted car that has been modified and boosts a lot more the it should. I think FC hits around 17# and with this turbo and wastegate I'm looking at more like 25# so when I hit the gas it doesnt fuel cut on me

And what turbo would that be?

 

[dsmcrzy]

Like I said you don't need an FCD, you need something to control your air/fuel because I bet your running hog rich. You need to get a SAFC or better yet get DSMlink. DSMlink is obviously miles ahead of an SAFC, but to get it running somewhat better then you have it now, before you blow your engine, do what you can .

In the mean time, crank your MB all the way down and stay out of boost until you find a way to control your injectors.

OP this is the correct answer. Only 420A's and other N/A card need FCDs.

 

[Roberti 2G]

Poor car

+1

I think you should take the advice given. Most people here aren't running FCDs. Just get the proper tuning and do it the right way.

 

[micha118833]

I'm not sure on the turbo, it's one my buddy had at his shop. A guy put it on a honda and the honda didn't hold up, and my he bought it off him. I don't think it's a great one probably ebay, but should get me through until the upgrade. and I wanna say he mentioned 40mm? He did say that I could get garrett internals for it if I wanted to stay with it if it ever became a problem. He is a fabricator so if something isn't quite right he can make it work. I'm not a mechanic I'm a computer tech so I go off of what my buddy tells me and he hasn't steered me wrong yet. He told me we can tune it in without having to "get a tune" with the 560's but not with anything bigger. The car hasn't been ran with the 560's yet. it was last driven with the stock injectors for about a mile and a half and was running way lean. The boost controller is turned al the way down and it won't boost over 5# because everything has to be broken in as it's a new engine and clutch. When I get back over there we will start messing with it more. All this being said.... I still want a schematic on a FCD even if it ends up that I don't need one.

 

[airmail96]

Like said previously, you should really just hold off and get some sort of tuning device. I know the need to run 25 psi can be a temptation, but having the car running safely in one peice should be much more important. But to each his own.

 

[micha118833]

even if I was driving the car right now it's only boosting 5# later on down the road I know it will boost at least 25# but we havent turned it up because the car isn't ready, I don't want to hurt the car either that's why I'm not driving it

 

[sax_man]

When you hit fuel cut it's for a reason. Your car is trying to tell you something, and installing a fcd isn't going to fix the problem; it's just going to make the symptoms disappear. Hope you're ready to #### your motor over.

edit: I you're only running 5 pounds of boost and hitting fuel cut, you probably have a huge boost leak somewhere.

 

[lasthope05]

I'm not sure on the turbo, it's one my buddy had at his shop. A guy put it on a honda and the honda didn't hold up, and my he bought it off him. I don't think it's a great one probably ebay, but should get me through until the upgrade. and I wanna say he mentioned 40mm? He did say that I could get garrett internals for it if I wanted to stay with it if it ever became a problem. He is a fabricator so if something isn't quite right he can make it work. I'm not a mechanic I'm a computer tech so I go off of what my buddy tells me and he hasn't steered me wrong yet. He told me we can tune it in without having to "get a tune" with the 560's but not with anything bigger. The car hasn't been ran with the 560's yet. it was last driven with the stock injectors for about a mile and a half and was running way lean. The boost controller is turned al the way down and it won't boost over 5# because everything has to be broken in as it's a new engine and clutch. When I get back over there we will start messing with it more. All this being said.... I still want a schematic on a FCD even if it ends up that I don't need one.

Let me get this straight. You are going to trust a guy that says you can run 560cc injectors without tuning the car? Also are those evo 560cc injectors? If so those really flow around 600cc. I dont know what kind of background he has on dsms but I feel bad for cars future and whats in store for it.


Only on a 1g you are able to get away with running 550cc injectors with no tune as long as your are running a 2g maf.

 

[grothe3297venge]

I'm not sure on the turbo, it's one my buddy had at his shop. A guy put it on a honda and the honda didn't hold up, and my he bought it off him. I don't think it's a great one probably ebay, but should get me through until the upgrade. and I wanna say he mentioned 40mm? He did say that I could get garrett internals for it if I wanted to stay with it if it ever became a problem. He is a fabricator so if something isn't quite right he can make it work. I'm not a mechanic I'm a computer tech so I go off of what my buddy tells me and he hasn't steered me wrong yet. He told me we can tune it in without having to "get a tune" with the 560's but not with anything bigger. The car hasn't been ran with the 560's yet. it was last driven with the stock injectors for about a mile and a half and was running way lean. The boost controller is turned al the way down and it won't boost over 5# because everything has to be broken in as it's a new engine and clutch. When I get back over there we will start messing with it more. All this being said.... I still want a schematic on a FCD even if it ends up that I don't need one.

WTF.. Does your buddy drive a damn Honda by chance?! Stop and read what people are trying to tell you. You ask for help, TAKE IT. If you are so set on a FCD, which "YOU DO NOT NEED". Do as you will. Why waste your money and time on a FCD when all you need is a damn way to tune.

 

[micha118833]

no my buddy has a dsm with ecu+ and does well with it, it's not his first either. I know I will have to have a tune later but he told me he can get me through until I do. I'm sure I'm not covering everything as I said it's not my field. there is no boost leak. I wanted the fcd because of what happened before the 6 bolt swap, it would hit fuel cut and I thought it would clear it up if it did it to me this time. he didn't tell me to get it and yes I trust him. yall act like I'm just going to go out and give it hell when it's not right and that's really not the case, I'm not even driving it right now I can't stress that enough. further more I got on here and asked for a schematic and that is something no one has helped with. I appreciate all the warnings. I've heard the warnings from my buddy too. the boost won't be turned up until the car is ready for it.

 

[AK Maniak]

You obviously aren't willing to listen to any ones advice. Your buddy is WRONG! With the kind of advice that he has given you he should never be allowed near a DSM. You absolutely do not need a FCD. And you absolutely DO NEED a way tune if you run anything larger than stock fuel injectors.

Poor DSM. It's no wonder why they have such a bad reputation for being POS.

 

[gusu]

Where exactly do you plan on buying ecu+ as the last one was shipped in 2008?

Not only that, but ECMlink is a better solution if you ever plan on getting support as well as being a amazing tuning solution.

The reason you aren't getting help on how to wire it is simply because NO ONE does that here.

The reason no one runs a fuel cut defender is simply because they are stupid and will just lead to you blowing up your car. They do not address the issue just let you go around the car's ability to try to save itself. The reason fuel cut happens is because the car is no longer accurately reading the air it is pulling in.

 

[T is for TURBO]

If you are hitting fuel cut, you have a boost leak. The stock 2g MAF is good for ~50 lb/m of airflow, or approx. 500 horsepower. If you don't even know what turbo you are running, you are not out flowing the MAF. You have a massive boost leak causing to MAF to read incorrectly, causing fuel cut.

YOU DO NOT NEED A FCD

 

[micha118833]

I have not hit fuel cut yet on this setup. I'm not even driving the car right now because it's not ready. As I stated before when the car was running the stock engine with a stock turbo and no boost leak it hit fuel cut when you would get between 17-20# of boost.

 

[Cdc1221]

Well bud, just some free advice, just go grab a gm maft and some 560s. While the maft has a socalled fcd built in, i suggest not using it. An fcd basically just locks the mas reading at the ecu's fuel cut threshold, which will cause the car to go lean for anything past it. While fuel cut has a nasty feel, it is there for a reason. A fcd is like putting a bandaid on a gunshot wound

I wish you well in your endeavors, but if you need help, pm me. Im not terribly far from you

 

[micha118833]

ok, when the car was running stock and just a modified waste gate for extra boost it would hit fuel cut and the gauge was reading all the way rich. Again this isn't happening right now, nothing is happening cause I'm not driving it, I'm simply on the net researching