DIY Fuel Ct Defender

[AK Maniak]

No matter how many times you repeat yourself the answer is still going to be the same. Do not use an FCD. Get DSMLink and find out what is really going on.

 

[Cdc1221]

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

Thats what it's supposed to do. The reason these ecus have that failsafe is because when it does hit fuel cut, its at the limits of the stock fuel system. When you take that failsafe away, nothing is there to stop you from overloading your fuel system and damaging your engine. The reason why everyone keeps mentioning ecmlink is because it will allow you to tune your car for larger inectors, more boost, etc. While it may seem that everyone is being hard on you, theyre really just trying to help

 

[micha118833]

I get it, I'm not going to use a FCD. But what I don't get is fuel cut is for running too lean right? why would it hit fuel cut if the gauge was reading rich? I'm not against buying something for tuning but it's not something I can do right now. I just shelled out for the new engine and everything to make it work. I said ecu+ because it's what my buddy uses, if DSMlink is available and ecu+ is not then I will look into it providing it's not outrageous

 

[Cdc1221]

No, if everything is as it should be, then it should hit 11:1 afr in boost even if it does hit fuel cut. Bear in mind it wont always hit fc. Ive hit 25 psi on an evo 8 16g on the stock tune/injectors before. Not wise. Needless to say that motor is history. If you cant afford link right now, go with a maf translator. While not nearly as good as link, it will allow you to compensate for bigger injectors, and can be used when you can get link.

 

[NHerron]

Way too much crap in here but I noticed you mentioned something about ECU+. Tom don't make that anymore. How you even heard about ECUplus is beyond me but why not go with ECMlink, it has tons of support whereas ECUplus is just about non existent these days.

 

[micha118833]

I thought it was a pick up where he left of because of the economy type thing with ecu+ and that it was again going to be made and supported. So a gm maf and a translator. I beleive i saw the translator for around $200

 

[T is for TURBO]

No, if everything is as it should be, then it should hit 11:1 afr in boost even if it does hit fuel cut.

Stock fuel system on a 2g (not sure about a 1g) at full airflow the ECU strives for 9.5:1 AFR

I get it, I'm not going to use a FCD. But what I don't get is fuel cut is for running too lean right? why would it hit fuel cut if the gauge was reading rich? I'm not against buying something for tuning but it's not something I can do right now. I just shelled out for the new engine and everything to make it work. I said ecu+ because it's what my buddy uses, if DSMlink is available and ecu+ is not then I will look into it providing it's not outrageous

Okay, fuel cut happens when the airflow exceeds the MAF limit. The ECU sees this and shuts off the fuel injectors. It does this to protect the engine from detonation. If there is no fuel in the cylinders, there is no chance of detonation. That is why it just the fuel flow to the cylinders.

What are you using for reading your A/F ratio? wideband or narrowband? if it's a narrowband, it's useless.

EDIT: I just saw in you're profile that you're using a narrowband. Which is a useless piece of blinky light junk. Get a real wideband a/f sensor and gauge.

 

[Hal]

Fuel cut occurs when the ECU determines that the airflow is excessive based upon a number of factors (rpm, load, etc). It has zip to do with the MAF limit, or fuel system capacity.

Some of you people need to spend some time learning how these cars operate.

Using an FCD these days is just half-assing the build process, no matter what the reasoning.

Hal

 

[toppertopper]

you don't need a maf and translator just get dsmlink and a wideband ,..Thats it no more fuel cut and you can tune , and many people can help you just by posting a log

 

[T is for TURBO]

Fuel cut occurs when the ECU determines that the airflow is excessive based upon a number of factors (rpm, load, etc). It has zip to do with the MAF limit, or fuel system capacity.

Some of you people need to spend some time learning how these cars operate.

Using an FCD these days is just half-assing the build process, no matter what the reasoning.

Hal

Well, you know waaaaay more than I do. So I'll shut up now.

Fuel cut occurs when the ECU determines that the airflow is excessive based upon a number of factors (rpm, load, etc).

So this explains fuel cut during a boost leak at "low" boost pressure? Excessive airflow reading + little load?

 

[micha118833]

with a stock ecu for a 97 model, what am i looking at spending for dsmlink?

ok I just finished researching what i just asked. I found the sockets for $1.99 and I solder and desolder for a living so that part will be a breeze. and it looks like DSMlink will run me $545. will have to wait but I believe I'm sold

 

[EGLTAWLN]

i still think you should make the fuel cut defender.

tune your car with link

but still make the fuel cut defender.

it sounds bad ass.

 

[5150DSM]

I agree with everyone else in that a FCD is NOT the way to go; however, since you asked the question...
http://www.dsmtuners.com/forums/newbie-forum/286502-can-you-how-fcd-missing-link.html Check out post #23 for a diagram and have at it. BTW, the search function is your friend, 99.9% of this shit has been answered before.

 

[micha118833]

I agree with everyone else in that a FCD is NOT the way to go; however, since you asked the question...
http://www.dsmtuners.com/forums/newbie-forum/286502-can-you-how-fcd-missing-link.html Check out post #23 for a diagram and have at it. BTW, the search function is your friend, 99.9% of this shit has been answered before.

Thank you for the post with the schematic. at the time that I made this thread I was in the dark on a lot of this. I wasn't sure if there was a difference in a FCD per engine and I was looking for one for the 4g63 which no one has covered obviously because it's a bad idea that I now know.
After talking with my buddy and not totally understanding everything he said I created this post for my own knowing because I do computer and electronic repair and figured I could create the FCD. I talked to him again yesterday I realize I didn't post things correctly and everyone jumped in trying to save my car from a doom that he wasn't going to let happen anyways. So I do thank everyone for the help because it really has helped no matter how I felt in the beginning about the help .
But I did use the search, just didn't find one because of the obvious. And while in the thread I responded with a couple of questions as conversation because we were already in a thread and didn't figure it would hurt

 

[micha118833]

OK I am ready to buy DSMLink, who is the best vendor to buy from?

 

[Colt4G63 also]

I hear these guys are pretty good:
ECMTuning, Inc.

 

[GSLENK]

classifieds for a deal, ecmlink.com for the setup new. Unless you find a steal, I would go new. Tom over there will help get you all set up, so all you have to do is send in your ecu, and you will get it back 100% plug and play. Most classifieds want like new prices anyway, so it isnt too bad to go new.

 

[micha118833]

I'm going to solder my own cpu as i do that for a living on pc's. but wanted to know the best place for the dsmlink itself thanx man

and yeah I'm looking for new

just ordered it from ecu tuning