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Ian C
03-04-05, 21:22
Name:
Fuel Cut Defender

Also known as:
FCD
Boost cut controller

What is it?
It's a bit of electronics that changes the airflow signal to the ECU so that it never sees more than 1 bar of boost. This is to avoid Fuel Cut.

Pros:
No more fuel cut when hitting over 1.0bar of boost as the pressure signal to the ECU is clamped just under 1 bar of boost.

Cons:
Crap FCDs scale the airflow input so that when the stock sensor hits 1.25bar (it's maximum) the ECU gets a shade under 1.0bar. This also has the effect of scaling the ENTIRE airflow signal so the ECU always receives a lower airflow value than the engine is really getting. Messes up the whole fuelling map towards the lean end of the spectrum and is therefore highly not recommended.

mark poulton
12-03-06, 18:01
hello, does an n/a have a fuel cut device as standard?

Robert
12-03-06, 18:03
N/A's dont need a fuel cut device as they dont make any boost....hence the fact its a N/A ( non-turbo)

mark poulton
12-03-06, 18:05
thanks, thats what i thought!!

lambertpig
12-03-06, 18:13
are there any cons for the thor unit ill be fitting next week?

JohnK
12-03-06, 18:17
The thor unit is considered to be the best on the market.

spidermonkey
30-04-06, 21:53
oh s**t i have one of these fitted

Lucifer
01-05-06, 03:08
oh s**t i have one of these fitted

We can always replace it with the grddy unit next week if you like.

PArt ex availalbe!

Sandy-m2
01-06-06, 21:32
what is a good way to tell if you have one?

PS. i cant drive the car at the moment so can only look at stuff

JohnK
01-06-06, 21:46
check the wireing by the ECU, (pin 68 rings a bell but i could be way off, do a search) see if you have any little boxes attached.

tango
21-07-06, 00:09
Hi there, when my car hit about 14-15 psi, I did some times get the sudden loss power an then back on afterward, but no warning light come on, is that fuel cut?
If so, how much is one of the fuel cut defencer?
cheers

Jake
21-07-06, 00:16
Hi there, when my car hit about 14-15 psi, I did some times get the sudden loss power an then back on afterward, but no warning light come on, is that fuel cut?
If so, how much is one of the fuel cut defencer?
cheersYes. My warning light never used to come on either, contary to what most people seem to get.
Try Thor Racing's website for FCDs

tango
21-07-06, 09:14
Hi Guys, I thought the fuel cut dont come in till 17psi, Im only set it at 15psi, looks like I have to reduce it, may be?
or if I have a FCD, what psi can I go up to, mine is stock TT with manual boost controler.
cheers

xxcat
08-10-07, 15:02
... This also has the effect of scaling the ENTIRE airflow signal so the ECU always receives a lower airflow value than the engine is really getting. Messes up the whole fuelling map towards the lean end of the spectrum and is therefore highly not recommended.
Are you sure that the voltage is "scaled" in the entire range and not "clamped" after some value..

Alex
08-10-07, 15:26
Are you sure that the voltage is "scaled" in the entire range and not "clamped" after some value..

As noted it's version specific. Crap one's scale.

DaveSupTT
24-10-07, 13:34
I have read a few other threads but im still unsure on this.
I was driving along the motorway giving it some, I was in O/D mode and getting some speed up and my turbo boost gauge was reading around 1.4, im unsure but I think the pre owner said that they were set to 1.2 and running on Hybrid turbos, but now and again the boost does creep above that.
My car has been delimited and I believe is fitted with a fuel cut defender. Although, I am not sure what kind and to be honest I know very little on this subject. Apparently its has a restrictor ring set at 1.2 bar which is not the best way to restrict the boost, and that an electronic boost controller would be more reliable - but like i said, i dont know! Anyway, I was driving along then all of as sudden all power was gone as if I had hit the breaks, quite an abrupt feeling, then after a few seconds the power was back. Am I right in thinking that this is known as fuel cut and its to prevent your car from over boosting?
Is there anyway of preventing fuel cut at all, yet still preventing your turbos from over boosting, as I wouldn't want to damage the car, but would prefer it if the speed wasn't limited in anyway by fuel cut.

Cheers guys!

Alex
24-10-07, 14:14
Sort the over boosting, not the fuel cut.
Fitting a "restrictor ring" will help.

DaveSupTT
24-10-07, 14:21
Sort the over boosting, not the fuel cut.
Fitting a "restrictor ring" will help.



Apparently it has a restrictor ring and its set to 1.2 bar?

amigo5
24-10-07, 19:38
BCC and FCD i think their work is one but different brand
shall it's make a differ if i install BCC since nothing talk about it here

any one may attach any manuals for the both??

note: mine is a J spec 2jz

DaveSupTT
24-10-07, 23:20
whats BCC? Boost Control C.....???

amigo5
26-10-07, 10:26
yeab
BCC is the greddy Boost Cut Control
my plan know is to go over 15 psi and using one of these units

any answer for my last question?

Nizam
14-06-08, 14:47
hi i need fuel cut denfender. im looking for to buy one. please if anyone got sechand or new let me know. im intresting! add me Niz_scarface@hotmail.com

Nizam
15-06-08, 01:44
hi im still looking for greddy fuel cut denfender. please let me know
i heard Hks is not good made for FCD.

absz
15-06-08, 08:16
hi im still looking for greddy fuel cut denfender. please let me know
i heard Hks is not good made for FCD.


Trying posting on the WANTED section. :innocent:

grumps2JZ
16-07-12, 12:16
hey guys i have purchased a second hand greddy boost cut befender for a 3SGTE (SW20).... but according to the person i bought it off it was removed from a working supra. anybody had any experiences using this? (jdm)