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-   -   HKS FCD Fuel Cut Controllers? (http://www.toyota-supra.info/forums/mkiii-supra/19175-hks-fcd-fuel-cut-controllers.html)

STR 05-25-2011 03:23 PM

HKS FCD Fuel Cut Controllers?
 
anybody have/used this mod? pro/cons?
http://www.horsepowerfreaks.com/part...llers/FCD/1917

916MKIIIx2 05-25-2011 07:02 PM

Thats pretty pricey, I think you could get the same effect and then some with a good air fuel controller. Of course the Air/Fuel controller will cost about a hundred more but I think its a better buy in the long run, especially if you're upping the boost. Simply raising the fuel cut level of the engine just sounds dangerous, more so for track only applications if any.

El Supracabras 05-25-2011 07:24 PM

Do they make a HGD? That might be more useful. Pros: car will be faster Cons: not for long. The money is better spent elsewhere, besides aren't those things from the 90's anyway?

STR 05-25-2011 09:20 PM

ok so what's a good Air/Fuel controller?

916MKIIIx2 05-25-2011 09:47 PM

There are a lot of good ones out there, try searching for Air/Fuel Controller in the search menu for the forum. But if I might ask what exactly are you going for in your car?

STR 05-25-2011 10:41 PM

with the 3" down pipe i have the boost is now higher then stock, 8-9 psi, and i cant give her WOT without the car hesitating. i can feather the throttle up and down but if i keep it floored she cuts power.

916MKIIIx2 05-25-2011 10:47 PM

Have you checked to make sure you didn't accidently unplug a vacuum line from the wastegate?

El Supracabras 05-25-2011 11:52 PM

If you are only hitting 8-9 psi it might not be fuel cut. I think it kicks in at a little higher pressure. Are you using an aftermarket boost gauge? The stock one isn't very accurate especially above 8psi.

STR 05-26-2011 04:54 AM

yes after market gauge. old one replaced with volt

El Supracabras 05-26-2011 01:27 PM

When you keep it floored it cuts out? In gear? Have you checked for any codes?

Travis89Turbo 05-27-2011 10:22 PM

That's not pricey. That's what they cost. I do think u can get one on eBay for $10 less. But I would buy from a company.

I have one and it works great. The downside is u loose the safety of a fuel cut. It just eliminates it.

He definatly can be hitting fuel cut at 9 pounds on a 7m stock ecu. But doesn't sound right to gain that much more boost with just a downpipe thou. I would for sure check the wastegate vac line.

Very few air/fuel controllers will help your fuel cut. And they are WAY WAY more expensive then $135!

The absolute best route will always be a full standalone. You get the best of all worlds. You have a fuel cut and it will be fully adjustable. Plus all the other perks will the fuel control. But with the slight mods you have and 8lbs. Then the HKS FCD is perfect for u.

Don't get to excited with boost WITHOUT supporting mods or you will blow your engine.

STR 05-27-2011 10:49 PM

thanks. i do want to mod but i think i will take my time. 9psi will do just fine for now, just want her to not be beat by mini vans lol

916MKIIIx2 05-28-2011 12:34 AM

You can definitely get a used stand-alone Air/Fuel controller with adjustable fuel cut off for 150-300 on ebay, but for you I would first find out whats making you overboost, simply putting the downpipe on shouldn't do that.

cre 05-31-2011 03:59 AM

I disagree, fuel cut at only 9psi on a stock CT-26.... something's wrong or you're driving in VERY crap weather (HOT and DRY). 9psi is the top of the spec for the MKIII, should be able to pass that with no problem. You really shouldn't see fuel cut until at least 12psi at sea level.

A fuel controller doesn't magically allow you to up the boost. It allows you to run higher flow (via larger injectors or higher fuel pressure) and then tell the ECU that less air is actually entering the system.

A FCD just flat out lies to the ECU by telling it that once a certain threshold there is no additional air entering the system.... VERY bad idea without a fuel controller and proper tuning to ensure you're not going engine killer lean.


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