TwinTurbo.NET: Nissan 300ZX forum - My dyno run at Stillen, and the IMSA GT race car!(PICS!!!)
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Subject My dyno run at Stillen, and the IMSA GT race car!(PICS!!!)
     
Posted by Royalfox7 on June 08, 2005 at 5:54 AM
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Message Finally! With stock turbos, stock injectors, stock intercoolers, stock engine, I finally dyno'ed at 402 HP, and 450 FT-LB!

For the longest time I've been dying to break 400HP at the wheels with stockers!

For this run, I ran 100 octane, 95% duty cycle on the boost controller which should be around 20.1 psi of boost, switched to program File 2 on my S-AFC II (that Specialty Z did such an awesome job programming on the last dyno), and experimented with 20deg BTDC timing.

The last time I dyno'ed last year, I started to knock at 19deg and a heatsoaked engine. So this time I experimented with spraying my intercoolers as insurance against knock at 20deg for my 3 runs. The night before Stillen Day, I got an empty spray bottle and made a mixture of water and alcohol, and stuck it in the freezer overnight so that the next morning it was half frozen. Then at the dyno, before each pull, I used this ice cold solution to spray onto my intercoolers. Finally, I used a Freeze-It can to freeze the solution on them even further. It worked!!! All three pulls, not a single knock. And she pulled consistent 400hp runs!


Here's her chart:
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And the solution I made up to spray my intercoolers: icewater/alcohol and a Freeze-It spray.
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I was worried at first because the dyno signups were already filled up early in the morning, but I managed to get in there at the last minute to get my run in before they closed the dyno at the end of the day.

Here are some pics. I left the hood open to keep the internals cool, and pulled the nose panel off for better cooling.
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Loading her up on the dyno...
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I instructed the technician how to spray the intercoolers with the mixture and freeze them up with the spray can. I also requested them to add intercooler fans.
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Strappin' her down...
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When it was all over, I was happy to see the results, consistent 400 Hp pulls, and was the highest pull of the day! And more importantly, no knocks even though the day got hotter just before my run, around 80deg.

Then Steve Millan came by the dyno, and we talked about the run and took a few pics together. That's him on the right.
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Then he asked me what it was I did on the intercoolers to keep them cool, so I showed him the stuff that I used and how I froze them.
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Then I asked him about his racing days and questions about his 300ZX IMSA GT race car and he took the time to answer everything. The car actually starts off with zero clearance in the main bearing when cold. This means that they actually have to heat up the aluminum engine block BEFORE they can crank over the engine!!! Also, the car runs with like 5 fuel pumps to maintain fuel pressure even as the fuel sloshes around in the tank during racing.

The car currently puts out about 700-800 HP. But as was explained earlier to me, the car actually started off with a much higher power output than that. But it was blowing everyone else away at the races. So they imposed a restrictor on his car to slow him down (I think it was a 28mm restrictor?). But then he still kept blowing away the competition because then he had so much torque coming out of the turns!!! Finally, IMSA said that's it, no more turbo cars!!!

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And then I asked if it would be ok for me to pop open the hood of his IMSA car and take a look at what's inside, and he said, "Absolutely!"...

And to think that I've only seen this car on the posters all around my cubicle at work.

So we walked inside the building where his #75 IMSA GT race car was sitting...
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And there she was, the #75 IMSA GT. Thing was immacculate! Such a badass car!...

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I couldn't believe I was in the same room with it!!!
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Check out those twin turbos peeking out from the back of the hood!!!
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The cockpit. How cool to have your name painted into your paint job of your race care eh? And look how far back the dashboard extends into the cabin. He sits waaaaaay back in there! Mainly because the engine is shoved so far back towards the center of the car.
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Some shots from the passenger side.
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And...as he promised...asked if I wanted to take a look under the hood. So I helped him lift the carbon fiber hood up and forward off of the car...GEEEEEZ, I could not believe all that elaborate duct work!!!!...
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And he took time to explain how all the ducting works. It's insane! I had a hard time following along his explanation! Those HUGE intakes lead up to the inlets of the turbos. Then they exit out I think through another chamber and door mechanism (?) that you can see tuck down below the turbos toward the sides of the car, then they lead back up to the front for intercooling, then they lead all the way underneath the car under the engine, up the back of the engine and right into the back of the plenum. Cunningham Racing did some wild design work on this car!


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And look how deep they shove that engine into the car!!!
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And ah yes of course, the infamous twin turbos...
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Actually, Steve told me that these turbos really aren't that big on this car. (Those are just heatshields around the turbine housing by the way.)
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And some last few shots of her, from the rear...
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Adjustable wing.
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Checkout the air outlet where the license plate cutout is !!!
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Last one. I love this angle. Such a clean carbon fiber underside...
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When Steve and I were outside, he told me that he really liked my car. So I said, "That's perfect because I really like your IMSA car! Wanna trade?"
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I was hoping for a handshake on it but...

...he just looked at me...and smiled.


Shucks.

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Hope you guys enjoyed the pics. It's late. Gotta get to bed now and catch some ZZzzzzz.

=Ricky=

     
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