I need multiple brains to solve my dilema.

I just installed an Apexi BOV, Blitz SBC-DC and HKS FCONV. The BOV did not have problem. The FCONV died when I had too much and too little boost. I experimented and found 40-60 gain on the SBC is best.

Bigger picture: I have an HKS air filter, HKS suction pipe, HKS intercooler pipes, catback Apexi N1 muffler, and trust downpipe. That is the only modification on the engine thus far.

This is the problem.

When everything is connected and rev the engine above 3K rpm, the engine struggles to stay alive or most of the time, dies.

I replaced most of the engine vacuum tubing with aluminum pipes. I checked and double checked the connections to make sure that I have no leaks.

Why does the engine die when slowing down or after I rev'ed up the engine? Do you guys have any suggestions?

Comments, ideas and words are much appreciated.

Thanks...

 

The stalling happens when you rev the engine and then let it drop back to idle? If thats the case, its probably your BOV.. To be certain you should swap the stock BOV (Diverter valve) back in.. This is especially true if the Blowoff valve you installed is a Vent To Atmosphere type..

Actually this info has been posted umpteen times in the forums so you can search for it. However at least this gives you a starting point. Our cars rely on the air that is metered through the MAF sensor, if you bleed off the air using a vent to atmosphere blowoff valve, the mixture/air volume is way off and basically it can stall or idle rough after you rev it..

 

I agree with Malibujack

 

Thanks for the suggestions. I will try that for now. I do not have the original BOV but I can borrow one from a friend. I will let you know the results on Sunday..

 

It probably is the BOV b/c that means your car is surging bad..If you dont' want to remove the BOV, the best way to fix it is to get a air-to-fuel controller...You'll need someone to professionally tune it so that you can will conpensate for the lack of air..or the air that is no longer returning to the intake..

-John

 

John.. I was expecting that the HKS F-CONV would manage my fuel and timing.

Come to think of it, it may be one of the three. So, I tried taking out the F-CONV and the problem disappeared with the BOV and Boost controller on it. I adjusted the Boost controller to either end of gain and it did not die. I had to turn the controller DOWN because I was boosting 1.50-1.55kg/pa or 25+ psi. too dangerous level!!

The F-CONV is supposed to be pre-programmed. I hate to leave it out and waste $1K for nothing.

**Does anybody have any experience with the F-CONV?

***What are the parameters/specific/settings to satisfy the F-CONV?

-manny

 

is the FCON-V you are using pre-programmed for the US market and US Evo's?

AFAIK, the FCON's (whether V or the entry level FCON-S) are pre-programmed, but for the japanese market.

Since the FCON is a programmable box anyway, most tuners I know still fine tune it for each car's specific application, taking into account the particular mods fitted to the car.

Boxes like the Ralliart Sports ECU are supposed to be plug and play, and aren't really designed to be fine tuned further. But the FCON is comparable to an Apex'i Power FC, Motec, Autronic, etc, in that they're meant to be fully programmable (though some are easier to fine tune than others, based on the availability of the software).

Just a thought?

 

The F-CONV is preprogrammed. It can be fined tuned with the car with the rest of the aftermarket stuff in it. I will cost me about ¥80,000/$750 to let G-Force tune it. If I decided to add other components, it will only be ¥30,000 to retune it. Knowing me, I will keep adding stuff to the car, so I will wait for now.

I was just talking with another friend of mine this afternoon and he saids that there is an Idle Stablizer that HKS makes for my problem. I am going to Autobacs this Saturday to research and then order it.

Sometimes, I think that I should have bought the PowerFC, but they did not make it for the CN9A. They have it for the CP9A.

hesperus, nice car! Pinoy din ako..

 

putik! now that's a funny coincidence! tagal ka na diyan? am getting a new built engine for my car... hopefully done by end january. shooting for close to 400HP @ the wheels if lucky!

never dragged. circuit only!

 

Been here for 5 years now. I am in the military. USAF..

Wow.. new engine.. I am intrigued. What would you have in the engine? That will be incredible with 400HP.. you must post the details and pics.. Gotta see it.

I do not drag either. There is no skill in driving straight. Circuits in the other hand, the car and driver mold together to show-off of what they got.