TwinTurbo.NET: Nissan 300ZX forum - Looks like the VG owns it in every case.
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Subject Looks like the VG owns it in every case.
     
Posted by Marshall on December 03, 2003 at 10:39 AM
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In Reply To umm i would think of all ppl wuold know it would be you... posted by Halo Z on December 03, 2003 at 07:45 AM
     
Message :any motor with a much larger turbo/s would suffer the same thing.

Yes, it would. That's why it's important to size up your engine displacement to the size of the turbos and power output you want. Squeezing out big numbers from a small engine is neat to see for a dyno queen, but that's all it is. It won't be very drivable.

:hmm looks like the stock turbo with bolt one and tuning dose much better than an NAZ

Saying it does better than a NA Z doesn't say much for a mod that's so expensive and labor intensive. I wonder what kind of power you could get out of the VG (that's already meant to fit the Z32) for that money?

B-Ster's dyno chart is not a good example of a properly setup VG. Look how mismatched it is. His torque curve is pretty bad. He must be running very aggressive cams and low boost there. See how slowly the boost ramps up and see how late the torque peaks? For relatively small turbos like TD05's, he chose cams which delivered peak torque way too high in the RPM range. If he ran more boost, he could have the torque curve ramp up much sooner to max out the turbos sooner, and he wouldn't have to have cams which delivered their max torque so high in the powerband.

The SR's are lacking usable torque in those examples. On that Enjuko kit, the SR isn't making 300 lbs of torque until about 4200 rpm, while the VG is making it by 3100 rpm. By 4200 rpm, the VG is making about 420 lbs of torque. So comparing two engines that put out similar HP, we see that the VG would be easily pulling ahead since its onset of torque is so much sooner, plus the fact that its peak torque is much higher. While at the end of the gear both engines are putting out similar HP, the VG has put out much more average HP the entire time (more area under the curve).

:long story short. the SR still hits peak tq b4 the VG.

That's not even a fair comparison there, since you're comparing a comparing a 500 hp SR to a 700 hp HP VG. If you want to objectively compare the merits of both engines, why don't you compare two engines that are putting out roughly the same power, as you did in the prior example with dean's Z and the Enjuko SR?

     
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