| *** a few shout outs are in order *** First-- Special thanks to Greg / Seb for their attention to detail / expert hands on knowledge / tuning capabilities / and fellow ship. Great conversations talking about GTR and Z related materials. I highly recommend to get a few guys together and get them over to your area to tune your high horsepower Z. With the experience and use
of the J&S knock box- thanks for the recommendation to buy / install in my Z - these guys are top notch.
Second- thanks to Tony Myrie for hands on special care with my Z. No major problems in years and on / off the dyno in record time with no issues due to your "prior review" of the Z. IMHO, a must standard for anyone looking to pay for tuning and dyno services. if you need work on your Z in the Philly area - contact Tony Myrie at BAM automotive. Don't take it from me, call Specialty Z for a reference.
Third- thanks to Matt at Performance Evolution. We will make you a "true believer" and change your business from ford mustang to Nissan in no time:) Fourth- thanks to Bernie for coming to the rescue with your nprobe. I have your laptop / power cable / and nprobe cable and will be sending that to you shortly.
Once again --Bernie was wrenching in a parking lot on again - not his Z :)
ok -- for the reason why you are reading this post.
I upgraded my turbos in the spring from the GT28Rs to the new GTX turbos. I can tell you at pump gas levels the power is about the same and so is the lag ( lack of ). However, the difference is seen once you run the higher levels. Well see for yourself. Both dynos are at pump gas with water injection (Tony Myrie's secret sauce and using J&S knock box w/ Seb "plug and play harness" :). money shot :
The Z spun the rollers and it appeared that my fuel system was starting to run lean. Time for new fuel pumps that produce more lpg as these were fine on the GT28RS turbos. 
safe boost levels to avoid detonation from running lean: 
outside of the wheel slip - you can see the positive shift in the power band with the GTX turbos over the GT28RS. I can tell you with the right breather mods - the turbos have the same amount of lag .. but more top end powa !! we had to throw bodies in the hatch. Seb stated that if my fuel wasn't an issue at this level - probably could have seen 825rwhp on these turbos on my setup.
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690 rwhp dyno
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Kid :" Those old guys drive that way ?" Witness : "Yeah, I rode behind them at ZNationals 2010 on these back roads leaving the track day and they were foot in. They ran into the curves w/no brakes and didn't lift!" - Hampton Inn parking lot at ZNationals 2011 - |
The difference between GT28Rs and GTX turbos - 
08:07:06 11/20/13
