TwinTurbo.NET: Nissan 300ZX forum - Updated twin GT3076 dyno results
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Subject Updated twin GT3076 dyno results
     
Posted by petadakilla on August 16, 2013 at 10:02 AM
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Message Hey guys, this may be "old news" to you 3zc users but for those of you who are not on both forums I figured I would share here as well.

Some of you guys may remember me posting dyno results back in March. Here is that link to refresh your memories on the results and mods list:
[ http://www.twinturbo.net/nissan/300zx/forums/general/view/2535432/638whp-on-pump.html ]

Since that March dyno, I added the following:

-JWT 500 hydro cams
-BDE intake and exhaust gears
-MSD Digital window switch to resurrect the VTC because my Apexi Power FC standalone ECU does not support it

*Both March and August results were performed on the same Mustang dyno, 93 pump gas, meth injection, and 25psi.

Here is the new graph:
 photo 20130802_183543_zps80271a16.jpg

Old graph for easier reference:
 photo 638whp_zps78a52bf7.jpg

Peak power remained about the same. Earlier in the day the car was putting down 640-650w but the smoothness graphs were not anything nice to post/keep. Had a tough time finding the sweet spot for disengaging the VTC. After several trial pulls, I found that shutting it down @ 5500rpms was the best. Anything higher and the graphs would flat spot/dip down.

The spoolup/midrange on the other hand improved a lot. At 4500rpms the difference in these two graphs was +100whp/+100wtq as hp went from 300whp -> 400whp and tq went from 350wtq -> 450wtq.

Earlier in the day the car was making even more whp/wtq @ 4500rpms, ~500wtq/~450whp, but after about 10 consecutive pulls playing trial and error with the VTC disengagement point, the car obviously got heatsoaked.

My car did not like the VTC up high. I tried it at 6k, 6.5k, 5.8k, etc etc. When the VTC was active around 6k and higher rpms, the whp line would dip drastically about 40/50whp. Shutting the VTC down @ 5500 eliminated that drop. Not saying every car should be set to disengage at 5500 so don't take that the wrong way and copy me because of my results!

The car also now breaks the 600whp mark at ~6krpms when back in march it did not make 600whp until ~7krpms. I am very happy about that as well.

As far as peak power goes, one would think that the JWT 500 cams would of given me more peak. I feel that the reason my car did not make more peak power was due to my valve springs. Right now I am using Supertech Dual Coil Valvesprings with the 84 base seat pressure. Supertech makes two different springs for the VG, the other set of springs that they offer have a 74 base seat pressure. My guess is the 74 is for hydro setups and the stiffer 84, that I have is for solid setups. Im not a valve spring guru by any means but the big change in parts from march's dyno was the camshafts. I would of figured that the 500cams to of been good for another peak 50/60whp. So I am debating on taking it apart over the winter and adding the jwt valve springs, or keeping my supertech springs and just going tomei 270/10.25 solid cam setup. I would like to go tomei as a local kid has their 264 solid cams and that car sounds 10x more aggressive at idle than my jwt 500 cams and having lightweight no oil consuming solid lifters sounds better than having hydro lifters. This is of course if the tomei cams can accept the vtc buttones in the rear and can work with my jwt adapters/bde gears.

But again I am in no rush to tear my awesomely running Z apart. Going to enjoy her for whatever is left of the summer!

Oh, the other major mod was selling the Iforged Aero wheels to a good Z friend and getting some CCW SP500s =) (Im a wheel whore)

 photo ccw3_zps005c8b37.jpg

     
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