-DC-

Hello, thanks for reading at 1st
i've found my KFCD on spare halfcut engine, im not sure whether its in good running condition or not, if theres a problem on the KFCD and i've installed it, will it harm to my engine ?
or is there any way or any sign if it running abnormal ?
thanks in advance =)

Darren

gracer7-rx7

iTrader: (16)

Which RX7?

alerx7

I read in a different post that if it does not work u would still get a fuel cut, I haven't read anything else about fcd going wrong and doing harm to your engine.

-DC-

fc3s s5 engine

-DC-

hi bro, still get a fuel cut or deactivated the fuel cut ?

RotaryRocket88

iTrader: (7)

If the fuel system remains stock and you increase boost, or get a boost spike due to boost creep (http://fc3spro.com/TECH/HOWTO/KWG/kwg.html), an FCD will just allow you to produce dangerous pressure levels. Beyond about 9 psi (fuel cut is 8.6psi), you'll start to run lean. But if you leave the boost low, and have a stock-ish exhaust system, you shouldn't have an issue. Same goes for taking appropriate measures to ensure you have more fuel delivery than stock (injectors, pump, computer).

-DC-

Hello bro thanks for the useful information =)
fyi im running on stock 0.5bar boost with 3inch exhaust system (all direct & having a 3inch inlet muffler only)
after i plug the KFCD to my car, i feel my backfire even bigger (i think due to even more unburnt fuel send out) and somemore my spark plugs are in bad condition now
isit the normal syndrome ?

anyway, do you know how can i check my injector size ?
thanks in advance =D

RotaryRocket88

iTrader: (7)

A full 3" exhaust can cause boost creep over stock levels, so be careful. Porting the wastegate would be a very good idea.

FCDs don't change fuel at all. They just trick the ECU into thinking pressure is below the normal cut-off.

You can tell if the injectors are stock by the color/shape/PN. Aftermarket parts you'll have to send them out for flow testing.

https://www.rx7club.com/showthread.p...55#post5131155

-DC-

thanks master RotaryRocket88 for the useful information
so i'll go find out on how to port the wastegate =)
but...any side effect after porting it if over ported ?

RotaryRocket88

iTrader: (7)

If the wastegate is ported too far, the flapper door won't seal, which will cause the turbo to spool up slower & reduce peak pressure.

-DC-

i see.....noted
then sand abit abit and test the result 1st =p
anyway, how much boost and what bov you using ?
im facing some headache issue that cannot be solved for long time on the blow off thingy

RotaryRocket88

iTrader: (7)

12 psi on a stock turbo with a stock BOV/bypass valve.

-DC-

sorry bro for the late reply...been busy recently
i see....im running 0.5bar (7psi) on knightsports turbine and sheepdog BOV
when revving the engine, the blowoff doesnt sound solid/peak at all
i've checked all the piping and all of them are ok
isit possible my turbine problem ? or its not a big issue ?
maybe i need to take the video for easier understanding =)

RotaryRocket88

iTrader: (7)

Some BOVs are adjustable. Maybe yours is set incorrectly and never opening.

In any event, a BOV is not necessarily needed. Some factory turbo cars do not have them, and there are people that do not run them on their aftermarket setups.

-DC-

yea, this sheepdog is adjustable
i've tried to adjust it to the most loose, it can release fast, but the blowoff sounds not so solid, like pssstttttchiuuuu............ pulling very long