My Experience with Jnaut and HP Logic

travisjb

Just read through all this... constructive thread and I agree with the conclusions regarding J SPEC AUTOMOTIVE. I'm not going to slam the guy, because as was stated he went through a rough patch with personal issues recently, but I do not recommend his shop at this point. I will say that there was definitely a comedy of errors on my car that cost me and others involved a chunk of change. Root cause = even professionals need to follow instructions! I've detailed this a bit on my journal, will update it further as I have more to share.

I have no input on HP Logic. Haven't worked with them.

My car is being reworked at Z Fever. I have confidence in their shop... it is not a visually impressive shop but the guys that work there are solid. The owner Doug is a busy guy but always takes / returns my calls promptly. They had the difficult initial task of figuring out what the last shop did wrong... Then tearing down the ruined engine. Installing new engine, piecing it all back together and tuning. I've challenged them to tune to no more than 385whp cold... the preliminary tune looks mediocre because they were trying to detune to my target with the smaller pulley... they will swap to larger pulley tomorrow and I should have a final dyno plot to share this week.

As I've mentioned elsewhere... Z Fever is also developing a solution for our fuel starvation... it's going to be a winner of a product!

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2009 370Z #104
*For Sale*

FL 4Motion

/\ you sir, now have my undivided attention.

Reality

Z Fever is doing some great work!.. They are definitely a talented group of nissan techs/tuners/enthusiasts..
GL!

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//2005 35th SB #81 [tyra] SOLD
//2006 GT PPW SOLD

kellyefields

as most of you know I was having the same issues that WOW had with the misfires and such. I to went to Z Fever today and from what I saw I had the same issues with the injectors not being scaled, stock timing and the such. after about 4 hours we had the car running right. ended up making 431 at 6psi. the car runs great now and feel much better about getting on the gas. They were also able to dignose the limp mode problem I was having. it seems that the air intakes were put on wrong. they were placed in front of the radiator instead of being off under the drivers headlight causing a ram air effect. this excess air was causing the computer to go wild because it was getting air when it didnt need it thus placing the car in a safe mode. I just flipped it around and hope this fixes the issue. I will report back on that but from just using a piece of cardboard and a high flow fan we could tell a difference in the air fuel. All in all I am very pleased with all the guys at Z fever. attached is a video they shot while I was there not the clearest but still fun to watch all the same.

Zfever tuned 2009 stillen supercharged 370z - YouTube

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MY 2009 SC BUILD.