contraption22
04-19-2010, 04:47 PM
Quote:
Originally Posted by contraption22
Mike (ZIN),
To bring back an old thread,
Is there any way to make a dry shot work without completely re-engineering our fuel systems, short of a custom cal?
Sure, the trick is to keep the boost pressure consistent. In a non-cal application, you'll most commonly, need to boost the fuel pressure above "normal", this adds the extra fuel for the nitrous. The amount of HP/nitrous is limited by the amount of fuel you can get though boosting the pressure. 80-85PSI is pretty much the max you can go, though some have gone higher, I think it is a good compromise with safety and max HP.
You need to test to see what your maximum fuel pressure is when @ full boost, then we can see what kind of "overhead" we have for adding nitrous. I'd start small, something like a 28 jet.
This is small enough to potentially do something but small enough to ensure we can't hurt anything. At the same time, it gives us an idea as to how much fuel we have to work with.
The best way to tune is by spark-plug color/indications. But, that method of cutting the engine off clean, isn't too kind to turbos, so a wide-band O2 is the next best thing. 10.5-11:1 is typical for heavy nitrous/turbo applications, but I would expect this application would prefer something in the 11-12:1 range. And, I would still look at the plugs for any signs of detonation, which is more likely to hurt an engine than running lean...
Another way to get the needed fuel is to fool the computer into adding extra fuel by modifying the coolant temp sensor's signal into making the computer think it's -20* out.
The first way I mentioned is the easiest, as there is a kit made to do just this, the NOS 05115, made for 5.0L Fords, though it can be made to work on anything using a vacuum/boost referenced fuel pressure regulator.
The second method is how we did our Neon (05182nos) and the Viper kits (05180nos). They worked great, but are a little more involved, but not too much.
Interestingly, you could do both!! Of course, you'd need a top-notch fuel pump to do it!
If anyone would like to know more, feel free to PM me or we could start a new thread...
Mike
Originally Posted by contraption22
Mike (ZIN),
To bring back an old thread,
Is there any way to make a dry shot work without completely re-engineering our fuel systems, short of a custom cal?
Sure, the trick is to keep the boost pressure consistent. In a non-cal application, you'll most commonly, need to boost the fuel pressure above "normal", this adds the extra fuel for the nitrous. The amount of HP/nitrous is limited by the amount of fuel you can get though boosting the pressure. 80-85PSI is pretty much the max you can go, though some have gone higher, I think it is a good compromise with safety and max HP.
You need to test to see what your maximum fuel pressure is when @ full boost, then we can see what kind of "overhead" we have for adding nitrous. I'd start small, something like a 28 jet.
This is small enough to potentially do something but small enough to ensure we can't hurt anything. At the same time, it gives us an idea as to how much fuel we have to work with.
The best way to tune is by spark-plug color/indications. But, that method of cutting the engine off clean, isn't too kind to turbos, so a wide-band O2 is the next best thing. 10.5-11:1 is typical for heavy nitrous/turbo applications, but I would expect this application would prefer something in the 11-12:1 range. And, I would still look at the plugs for any signs of detonation, which is more likely to hurt an engine than running lean...
Another way to get the needed fuel is to fool the computer into adding extra fuel by modifying the coolant temp sensor's signal into making the computer think it's -20* out.
The first way I mentioned is the easiest, as there is a kit made to do just this, the NOS 05115, made for 5.0L Fords, though it can be made to work on anything using a vacuum/boost referenced fuel pressure regulator.
The second method is how we did our Neon (05182nos) and the Viper kits (05180nos). They worked great, but are a little more involved, but not too much.
Interestingly, you could do both!! Of course, you'd need a top-notch fuel pump to do it!
If anyone would like to know more, feel free to PM me or we could start a new thread...
Mike