I am considering using nitrous with a Procharger as a form of intercooling. I am looking at using a fogger setup instead of a plate setup. How much of a shot would be the most I could use. Would it work if I was using an air to air intercooler also, or would that be overkill. I am wanting to use high boost numbers (15-18psi) and only want to use nitrous when I am making that kind of boost at WOT.

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1986 Iroc Z 305
3.23 posi-rear
ported mass-air
custom ram-air
removed air pump, converter, straight pipe no muffler
0-60 5.5 sec
1/4 mile at 102mph
top speed 160mph (racing a mustang)
est 285hp
fiberglass hood
$2000 Alpine stereo hit 135 in spl comp.

 

why in the hell would you do that when all prochargers come with intercoolers? not to mention the complexity and how hard it is to tune nitrous as an intercooler.

 

You don't really have to tune nitrous to use it as an intercooler. You just use it as you normally would. If your engine is tuned right then it will add the additional fuel for the temperature drop. Any fuel that needs to be added to the nitrous should be added with the nitrous. Besides when you use nitrous you retard the timing. If you can cool the intake charge enough you can add timing to the engine instead of taking it away.

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1986 Iroc Z 305
3.23 posi-rear
ported mass-air
custom ram-air
removed air pump, converter, straight pipe no muffler
0-60 5.5 sec
1/4 mile at 102mph
top speed 160mph (racing a mustang)
est 285hp
fiberglass hood
$2000 Alpine stereo hit 135 in spl comp.

 

ATI's TPI kits include an intercooler, so using nitrous to aid in cooling is not necessary. I sense you want to use nitrous to make more power with the cooling effect a byproduct, not the cooling effect as your primary reason for wanting to use nitrous. Am I right? If cooling is your primary reason for using nitrous, I would use water injection instead. I have used Carroll's water injection system with great success.

Because the air/fuel ratio when using nitrous is determined by jet sizing and fuel and nitrous pressure held at constant values, you cannot use any type of device that regulates fuel pressure (i.e. an FMU). Doing so would result in a super rich air/fuel ratio which causes oil to be washed off the cylinder walls resulting in scoring and a loss of compression. The only other alternatives are to fine tune the engine with a combination of larger injectors and a properly calibrated PROM or a supplemental fuel supply system such as Carroll's Superfueler.

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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://members.optushome.com/au/downunder1/rides/willie/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

[This message has been edited by Willie (edited January 20, 2001).]

 

You are correct, Willie. I want to use nitrous as another power adder and just experience the cooling effect. You could use the nitrous with the FMU if you run a separate regulator to go to the fogger or plate kit. Most fogger kits recommend using fuel pressure that you would use with a carburator, around 5-10psi. What you would do is split the fuel line coming from the pump and send one side to a regulator set to low pressure, then "T" the return line into your current return line. That way when your fuel pressure goes up with boost it doesn't screw up your nitrous jetting. Its good to see that some people don't crack on other people's ideas. Theoretically if you use an intercooler in addition to N2O it will make the system effectiveness higher, which is good. Cooler air always makes more power if you add the right amount of fuel to it.

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1986 Iroc Z 305
3.23 posi-rear
ported mass-air
custom ram-air
removed air pump, converter, straight pipe no muffler
0-60 5.5 sec
1/4 mile at 102mph
top speed 160mph (racing a mustang)
est 285hp
fiberglass hood
$2000 Alpine stereo hit 135 in spl comp.

 

Good idea. But I've got to ask, what is your ultimate goal? And can your goal be achieved with just a supercharger? With boost figures you stated (15-18 psig), I don't think you'll need nitrous to achieve your goal (unless it's sub-10 second times!!).

I agree with you here, but I also know that water injection has a better cooling effect than nitrous. I have experimented with supercharging, nitrous and water injection. My best time to date is a 12.04 with 6 psig boost (Paxton) and a 50 shot. My present goal is to eliminate the nitrous and run just as fast by increasing boost. I don't think this will be a problem considering I have run a 12.57 with 6 psig boost and no nitrous. I sold my Paxton and am in the process of tuning my new ATI. What I have noticed is the temperature of the ducting before and after the intercooler. The compressor is hot, the ducting before the intercooler is rather warm and the ducting after is stone cold. I expected it to be slightly on the warm side, but it is as cold as an engine that hasn't been running for days. I'm very impressed at the effectiveness of the intercooler. Therefore, it is entirely possible that I won't need water injection to further cool the intake charge (but I have it just in case).

Willie



[This message has been edited by Willie (edited January 21, 2001).]

 

My ultimate goal is very high horsepower numbers and possible sub-10 sec times. I am in the process of trying to find a transmission now. The best one I have found now is an Art Carr 700R4 that will support 800 hp but I fear that I may exceed that. I may have to go with a TH400 or they suggested a 4L80E. It is true that the intercooler is very effective but as boost pressures and heat go up the effectiveness will go down slightly. That is where the N2O will come in, when intercooler effectiveness goes down nitrous will bring the efficiency back up and give a power boost. As you can see in my sig. I run est. high 13 sec 1/4 mile times at 102 with a stock 305.

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1986 Iroc Z 305
3.23 posi-rear
ported mass-air
custom ram-air
removed air pump, converter, straight pipe no muffler
0-60 5.5 sec
1/4 mile at 102mph
top speed 160mph (racing a mustang)
est 285hp
fiberglass hood
$2000 Alpine stereo hit 135 in spl comp.

[This message has been edited by IrocZ335 (edited January 21, 2001).]