14 psi on stock injectors and afm??
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not necessarily.. if the a/f is within check then will be fine.. I would assume it would be ok.. the factory ecu runs very rich stock.TurboWarrior said:
fuel cut is there for a reason...you may be fine, but you run the risk of running lean and burnin' up. I wouldnt run with an FCD without having a wideband (and the cash on hand for a rebuild kit incase you do burn up)
EDIT: woah, intercepted
EDIT: woah, intercepted
HKS FCD will avoid fuel cut.
It's possible to run this setup, but there's nothing "safe" about it.
It's possible to run this setup, but there's nothing "safe" about it.
Getting rid of the FCD.
All an FCD does is it's a signal clamp. Once the signal from the AFM exceeds a preset value, the FCD just lies to the ECU and reports that preset value instead of the real one.
Think about that, no matter how much air is moving into your motor, the FCD stops the computer from seeing it above a certain point. This means there is no additional fuel added for that air.
An FCD on a MKIII is a recipe for disaster.
You keep saying he has an AFM. What do you mean? A Lexus SC400 AFM, or a stock one?
Removing the FCD, and swapping to a Lexus SC400 AFM with 550 cc/min injectors would make it safe.
If he doesn't want to get the injector/AFM combo, remove the FCD and take the boost down to about 12 psi and it will be fine.
All an FCD does is it's a signal clamp. Once the signal from the AFM exceeds a preset value, the FCD just lies to the ECU and reports that preset value instead of the real one.
Think about that, no matter how much air is moving into your motor, the FCD stops the computer from seeing it above a certain point. This means there is no additional fuel added for that air.
An FCD on a MKIII is a recipe for disaster.
You keep saying he has an AFM. What do you mean? A Lexus SC400 AFM, or a stock one?
Removing the FCD, and swapping to a Lexus SC400 AFM with 550 cc/min injectors would make it safe.
If he doesn't want to get the injector/AFM combo, remove the FCD and take the boost down to about 12 psi and it will be fine.
tissimo said:
I kinda doubt it if he just swapped to the lexus afm. which seems to be the case. Original post is a bit confusing
Supracentral said:
Yeah, FCD is bad juju.... My car had one when I bought it, it was actually messing with the SAFC, so I yanked it. Read later that it was a bad mod in the first place.
yea fcds are bad when you dont know what you're doing.. if you know how they work and setup the system properly, they can be a great aid... but afc (or similar) is far better imo
i'd lose the fcd get a new fuel pump and run boost right under fuel cut that is assuming the car is in top notch condition
is this supra your daily driver? if yes, then i wouldnt run over 12 psi unless you've got a strong engine and cash for a fresh turbo. thats just me, though. :shrug:
FCD + AFM = Fail.
Well, without monitoring systems and tuning capabilities, it's not recommended at all.
With that being said, sort of off-topic, but not really...
When I backed out the Unmetered Air Screw in the stock AFM...
At one point, I was hitting 18psi before hitting fuel cut.
So...Doing this route is "safer" than an FCD...but still doing the same job.
Yes, that was 100% accurate reading...but the turbo was just blowing hot air at that point.
-Jeff
Well, without monitoring systems and tuning capabilities, it's not recommended at all.
With that being said, sort of off-topic, but not really...
When I backed out the Unmetered Air Screw in the stock AFM...
At one point, I was hitting 18psi before hitting fuel cut.
So...Doing this route is "safer" than an FCD...but still doing the same job.
Yes, that was 100% accurate reading...but the turbo was just blowing hot air at that point.
-Jeff