Fuel cut on XEDE ?
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From: Houston
Fuel cut on XEDE ?
I got my xede and cam gears and i was going to install it but i heard that there was a couple of stage 1's that the fuel pump wore out so for extra protection and iam gettin some HKS cams soon i ordere the walbro 255lph fuel pump , i have heard on the stock ecu it creates fuel cut at 4500 rpms is this the same deal the the XEDE fuel mapping ?
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From: Danville/Blackhawk, California
The only time fuel cut is induced is when boost is too high. This will usually trigger at 4500rpm since that is where boost pressures are the highest, all things equal. With the baseline maps, you *should* not get boost cut with the stock ECU. If you do, however, all you have to do is drop the numbers in the boost table down a bit to compensate. Your target peak boost should be 20-22psi, depending on the gear. This applies to those with stock ECUs as well as XEDEFlashed ECUs.
Cheers,
Shiv
Cheers,
Shiv
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From: Houston
Originally Posted by shiv@vishnu
The only time fuel cut is induced is when boost is too high. This will usually trigger at 4500rpm since that is where boost pressures are the highest, all things equal. With the baseline maps, you *should* not get boost cut with the stock ECU. If you do, however, all you have to do is drop the numbers in the boost table down a bit to compensate. Your target peak boost should be 20-22psi, depending on the gear. This applies to those with stock ECUs as well as XEDEFlashed ECUs.
Cheers,
Shiv
Cheers,
Shiv
Fuel cut is a safety feature - your Walbro isn't going to prevent it - it's just better than the stock unit at maintaining fuel pressure at elevated boost levels than the stocker. You can only get rid of the fuel cut by reflashing the stock ECU. Unless you plan on running more than 22-odd psi (and have things like head studs etc) I would leave it alone.
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From: Houston
Originally Posted by digitaltekniq
Fuel cut is a safety feature - your Walbro isn't going to prevent it - it's just better than the stock unit at maintaining fuel pressure at elevated boost levels than the stocker. You can only get rid of the fuel cut by reflashing the stock ECU. Unless you plan on running more than 22-odd psi (and have things like head studs etc) I would leave it alone.
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From: Danville/Blackhawk, California
The cut is really triggered by MAF so actual boost will differ a bit from car-to-car, temp-to-temp, altitude-to-altitude, etc,. But usually around 23psi for 03-04 EVOs and around 25psi for 05s.
Shiv
Shiv
Originally Posted by shiv@vishnu
The cut is really triggered by MAF so actual boost will differ a bit from car-to-car, temp-to-temp, altitude-to-altitude, etc,. But usually around 23psi for 03-04 EVOs and around 25psi for 05s.
Shiv
Shiv
crazy, my car wanted to cut at anything above 20psi.
You may see fuel cut on colder days (32 degrees or below), since you will start to boost higher with the colder, denser air... seeing that you're in Houston, though, hopefully you won't see too many of those. Here in Chicago, I was seeing peak boost numbers of 25+ psi in very cold weather (<10 degrees), which scared the bejeezus out of me and I have since adjusted my boost table.
l8r)
l8r)
