Fuel Cut Defender?

[InfiniteGSX]

· What is a fuel cut defender?
A simple device actually. OBDII cars (96+ DSM's) don't like detecting postive manifold pressure (turbo). The ECU detects manifold pressure by the use of the Manifold Absolute Pressure sensor or MAP. Our cars come with a 5volt MAP sensor, on Wide Open Throttle and our cars running Naturally aspirated, the MAP gives a signal to the ECUof around 4.7volts. If it reads more than that then you are creating positive manifold pressure and the ECU flips out and starts cutting fuel and doing all kind of weird stuff. The VC1, or Fuel cut defencer simply "clamps" the voltage down to a certain voltage, hmm how about that, 4.7volts! So, your ECU stays happy and doesn't start retarding ignition and cut fuel when you go under boost.

Is this true? And if so where do I get this?

 

[TalonESIT]

Yes, it is true. You can search ebay for the term "Fuel cut defender" and that will give some results (different names depending on the vendor). Search for that term on these forums as well and you will find some good choices as well.

 

[greenmeanie99]

Yes, it is true. You can search ebay for the term "Fuel cut defender" and that will give some results (different names depending on the vendor). Search for that term on these forums as well and you will find some good choices as well.

Here is a really good special and I have delt with this vendor too they have amazing prices

http://dsmtuners.com/forums/showthread.php?t=245412

 

[BigRand]

Our wonderful NT-Moderator makes them too, Just PM him.

P.S. I think I push paul's fcd's hoping he might let me get at the datalogger he's making.

 

[420a16g]

do you still need one of these if your running something like a portfueler and a AFX computer?

 

[TalonESIT]

do you still need one of these if your running something like a portfueler and a AFX computer?

Yes, a fuel cut defender is a voltage stabilizer. Unless Howell's ecu is adjusted to not freak out when the map see's boost, then you will still need some type of fuel cut defender. Isn't that what that black box is that hahn sells for 100? Cause I took mine off my car and have it just laying around if someone is interested. PM me if interested...

 

[420a16g]

Yes, a fuel cut defender is a voltage stabilizer. Unless Howell's ecu is adjusted to not freak out when the map see's boost, then you will still need some type of fuel cut defender. Isn't that what that black box is that hahn sells for 100? Cause I took mine off my car and have it just laying around if someone is interested. PM me if interested...

Im not sure if Hahns box prevents this or not, doesnt a missing link do the same thing?

 

[TalonESIT]

Im not sure if Hahns box prevents this or not, doesnt a missing link do the same thing?

Yes, a missing link does do the same thing (just mechanical option vs. electrical).

I just checked the hahn website and the box I have, the fuel mapper, does do the same thing. Nothing big just a voltage clamp to hold a steady voltage to the map sensor.

 

[VelocitàPaola]

Here is a really good special and I have delt with this vendor too they have amazing prices

http://dsmtuners.com/forums/showthread.php?t=245412

Haha... that's actually my FCD they're carrying now. Good find.

 

[420a16g]

Yes, a missing link does do the same thing (just mechanical option vs. electrical).

I just checked the hahn website and the box I have, the fuel mapper, does do the same thing. Nothing big just a voltage clamp to hold a steady voltage to the map sensor.

so then i wont need to buy one of these right?

 

[TalonESIT]

so then i wont need to buy one of these right?

No, actually the opposite. Unless the AFX ecu does something for the map sensor, you will need one of these or else your car will throw a CEL light (fuel cut).

I own a 95, which is why I removed mine, but since yours is a 97 you will need one of these.

Wait, do you already have a missing link?

 

[420a16g]

No, actually the opposite. Unless the AFX ecu does something for the map sensor, you will need one of these or else your car will throw a CEL light (fuel cut).

I own a 95, which is why I removed mine, but since yours is a 97 you will need one of these.

Wait, do you already have a missing link?

no all i have is the portfueler and the AFX computer if Howell fcking automotive will ever send it to me, but i wont rant on them in this post.

so which one would be better a missing link or an electronic fuel cut defender?

 

[TalonESIT]

no all i have is the portfueler and the AFX computer if Howell fcking automotive will ever send it to me, but i wont rant on them in this post.

so which one would be better a missing link or an electronic fuel cut defender?

I honestly dont know the answer to this one, or if there is even a correct answer.

Whenever this topic was brought up, it was a matter of opinions from there. Almost like when people compare electrical oil gauges to mechanical ones. Missing Link is cheaper and it gets the job done. Some people would rather rely on the electrical alternative.

 

[totaleclipse_05]

I am rocking one of Paul's FCDs and it works very nice. I think he's asking around 40-50 for his.

 

[DSMcrazy3]

I would definitely go with the FCD! I've seen many instances where missing link has failed. At this stage..Electronics shouldn't worry you.(Especially Pauls. I've recieved many of his electronics and can vouch for him if you were to have any concern)

 

[420a16g]

hey paul please pm me a price and some more info.

thanks

 

[InfiniteGSX]

This exact subject doesn't apply to a 2G-A Does it? Cause thats what I'm currently working on. A buddy's 95 RS. Pretty nice car for a ricer but I just ordered all the same equipment for his car that I Did for mine, minus the .60trim turbo... got him a .57trim.

 

[Locke]

If he has the OBD2 computer then he will need an FCD/ML. If it's an OBD1 ecu, then he wont.

 

[VelocitàPaola]

"OBDI" and "OBDII" are misnomers. All 2G ECUs supported the OBDII protocol, however, '96 was the first year OBDII became a mandatory feature mandated by the government. It'd be more correct to describe the ECUs by "one plug" or "two plug." The later "two plug" style requires an FCD, while the earlier "one plug" style does not.

 

[BigRand]

FYI: 95's are OBD2 just w/out the newer paramerters. So I would start describing it as the 1pug vs 2 plug ecu or early vs. late.

 

[BigRand]

damit paul

 

[VelocitàPaola]

Oops.

I corrected it.

 

[Locke]

My apologies, Thank you for the correction.

 

[InfiniteGSX]

Ok, So then his wont need it. HAHA, I blew up his motor to shit last night... thank god he bought my spare! He bought my spare but from playing around with his car I found out that he actually just needed a new head, a valve was snapped in half... the car still had power but a loud knock... so last night I was trying to blow it up hehe.... it worked after I almost ripped the tires off... I love 420A Motors! So I'm just going to pull his motor and swap in my good one that came out of my 98 GS. it should be nice. Just gotta clean up his trash... the car is fully yellow! yellow interior and exterior, ####ed up wires on the interior... it needs alot of help!

Thanks guys.