| Well, nothing like the swift kick in the butt from an N2O addition to an already healthy performer - this car is just too fun to drive! This is mainly a continuation of last night's dyno post - this is the same car as the data posted from last night, running Z1 Stage2 turbos, but now with an N2O setup installed. Just some quick information on the N2O setup:
It is a 60HP wetshot - one nozzle mounted into each of the hardpipes.
The control parameters are as follows:
- An MSD RPM Window Switch which allows for a circuit to be closed at a user defined RPM and then opened at a higher, user defined RPM. In this case it will complete the N2O circuit at no lower than 2000RPM and then open the circuit at 5000RPM.
- A hobbs pressure switch is also used which opens the circuit when boost is above ~22psi.
- A WOT switch is employed which triggers the circuit at WOT.
- A primary arming switch to enable the system
- A bypass switch which allows N2O spray as long as the engine is WOT, regardless of manifold pressure or engine RPM. With this configuration you can switch between a spoolup shot to a full spectrum WOT shot. Here are the dyno results: 480HP/472TQ - The light blue curves are pumpfuel, ~19psi.
545HP/531TQ - The green curves are racefuel, ~24psi.
537HP/585TQ - The red curves are racefuel, ~24psi + Spoolup.
591HP/593TQ - The dark blue lines are racefuel, 24psi + Full Spray. (Keep in mind that the 590HP pull was not purged before it was made which is why you see the A/F plummet at the beginning of the pull) 
Now for a little dyno comparison to the spoolup characteristics of stock turbos: 
At 3500RPM stock turbos are at 240HP/350RWTQ and Stage2's + N2O are at 260HP/400RWTQ for a 20HP/50TQ advantage for the stage2+N2O. At 4000RPM stock turbos are at 300HP/300TQ and Stage2's + N2O are at 400HP/520TQ for a 100HP/220TQ advantage. This is almost my favorite RPM on this car and this is just about when you get that swift kick in the butt. By 4500RPM stock turbos are maxing out in their torque with 420ft/lbs and that swift stage2+N2O kick in the butt has commenced at 590ft/lbs, having a 170ft/lbs advantage and now holding a 130HP difference over stockers! Looking at the stage2 dynochart you might be wondering why there is so much gained from a small 60HP shot on the bottom end - at the biggest difference we see a gain of about 140HP at 4000RPM and 180ft/lbs!! Well, this is because a "60HP shot" of nitrous is only telling you what the peak gain of horsepower is which you can see there is really only about a gain of ~45HP at the peak. This is because at lower RPM the engine is consuming less air and the N2O shot is a static flowrate. At lower RPM the N2O is saturating more of the intake, but this falls off as the engine begins breathing more air (as RPM increases). So although its only called a '60 shot', there's a whole lot more going on under the curve, and you definately feel it in the butt-dyno! I could continue on with the comparison, but all I trying to demonstrate is the spoolup differences between larger turbos + N2O vs. stock turbos that are producing very appreciable numbers themselves. A lot of people talk about not wanting the lag associated with larger turbos but N2O is a wonderful tool that virtually eliminates the lag - its like driving a bigblock V8 with that instant torque. Please, before you consider jumping to a conclusion that the comparison show here is not fair just keep in mind that I'm not trying to compare the total power/torque output of stock turbos vs. larger turbos + N2O - we all know which is going to make more peak power. All I hope to have shown here is some solid numbers rather than a bunch of talk and show how much a car with larger turbos + N2O can spoolup compared to a healthy stock turbo Z. Most people compare the ability to spool a turbo to stock turbos and granted if there was a car with stock turbos plus an N2O spoolup kit it would obviously spoolup better than these larger turbos plus N2O. I only wanted to try and be helpful by sharing this data - I know I will definately be putting a spoolup shot into my Z once I get her back together. I also want to add to those not familiar with N2O is that while N2O is a great way to gain power, it is also an easy way to lose an engine if not properly used. Greg D. has posted a good deal of very useful information about the use of N2O and I would suggest you do some searching and researching if you plan to do this. But, if installed and used wisely, N2O can be a very safe and effective tool - just dont get all F&F with it and you'll be allright. ;-) Tomorrow I will post the information on The Peacemaker's N2O spoolup kit dyno runs - it is pretty amazing to see those big turbos spoolup with the help of some spray. *stay tuned*
[ ashleypowers.com ]
[ agpowers@bellsouth.net ] [ Zemulator Information Sheet ] [ Z1 Motorsports Website ]
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Some more dyno goody information - Just Say Spray. - 
