I would have suggested an o2 clamp but with the hesitation point being as high as it was it didn't seem like that could be it. You don't happen to use the stock DP & wastegate setting do you?

STOCK to the bone!

Bastard!! Its happening again, but now its at a higer rpm! haha.. .

I think the Emanage has to be installed with some dyno time!

Yeah, as much as I like Bruce's O2 clamp, I kinda figured there was no way it would fix your problem. The only time the O2 clamp comes into play is part-throttle at <4000 RPM. Did you ever get a wideband on the car? Without that, you're pretty much just shooting in the dark. If you don't get this sorted, you may find it crop up again with the eManage; you need to figure this one out first.

There is one more source, I might take out the JDM Greddy Turbo kit supplied FUEL CONTROL UNIT.

It could be this unit fucking around with the car.

Please see attachment on the diagram if that make any sense.

ohhhhh, you got have the JDM version.....I'd pull it, you're fine with just an FMU. That modifies the AFM signal, so I can see it reeking havoc.

We can never have too much information. When you told us you had a Vortech, I didn't think you would have the "Black Box" installed also.

So this did turn out to be an issue with over fueling?

Oh snap! Dude, you have both the "black-box fueling" [i]and[/] the Vortec FPR running?!

This morning I thought i got it all sorted... but it just delay the issue! as such I reintalled the Vortech and the problem is worst! I think the BLACK BOX and VORTECH will be gettin divorce tomorrow morning! haha

Is this Vortech with 12:1 disk?

The black box tricks the ECU into running rich. You either need the vortech OR the black box, not both. This is why you are running pig rich and explains the hesitation.

Will definitly take out the BLACK BOX and throw it into the BLACK HOLE tomorrown morning!

Considering it doesn't have a ring for the disc, then I would assume 12:1

or measure it:
12:1 - 2.72"



yeah, I'd throw out the box. It has been working for tons of others to just run the FMU without any other fueling device. I thought the JDM kits didn't have a FMU at all and can only fuel for about 4-5psi tops.

HI Braineak,

I took out the BOX, seems running fine but still needs more testing on the road.

As for the Vortech disk, could I trim the disk to get down to a 10:1 or 8:1?

The smaller discs have a ring that goes around the outside so that the disc does not transmit the pressure of the full surface area of the diaphragm. This is what reduces the pressure ratio.

There is what I am running now:
1.8 Injectors
AFPR- liner rising (some Italy brand)
190hp Walbro
4-5 psi
O2 clamp

at 5 psi it sounds like you have waaaay too much fuel....the fuelling setup you have with the 1.8's and afpr is enough for 8-9 psi let alone 5 psi....take it to a dyno and do a run and youll see exactly where your at insted of replacing parts and spending loads of time tinkering......when i first set up my car it was waaaaay to rich and it would cough and buck like it had dropped a cylinder until i got it on the dyno and saw the afr was under 9:1:eek4: .

THANKS EVERYONE ....! THIS CASE IS FINALLY CLOSED!

removed the Blackbox and did a whole day of testing! everything is A OK!

What, it wasn't overfueling?! It was a little black box reeking havoc?!

Although now you should think about a new FMU disc.