Yeah, from the little bit I know mid to high 11s is ok, when you hit mid to high 12s FI is when you're closing in on dangerous territory.


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no, 11.0 to 11.5 is safe. i have yet to tune a car on pump gas even on low boost at that afr.

AFR is just one of many things that factor into a tune and vary from car to car.

afr varies from type of fuel and type of boost from car to car. as far as pump gas it should always be 11 to 11.5 for sure.

:hello:

Wow that was a lot of reading but I'm glad I took the time. If my car ever gets it's TT kit then I'll have to take a look at this thread again to see how you guys are making out.

Mine is just simple bolt ons and was tuned by Jack @ HP Logic. It was on the dyno for roughly an hour and did 10-12 pulls.... I made 298whp in the dead heat of August and 75% humidity. I haven't had issues with how the car is running but I do throw those codes that seem fairly common on here. They pop up every 400-500 miles.

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!

/\ you sir, now have my undivided attention.:eek:

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

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

No response from hp logic or jnaut explains it all.

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That's usually how it goes down, they just hope to brush everything under the rug and just hope it goes away... Then the next unsuspecting customer walks in and it'll be déjà vu all over again..

When it comes to FI thas when u hear the horror stories... Anyone talkin about doing an NA tune with them is jus blowing smoke as there's not much to worry bout blowing something in NA.

Wish I saw this thread sooner than later. After my car left HP a fe months ago my engine didn't last more than a week. Now with a new engine and my Stillen SC I plan to tune with Matin Struck at Z-Fever which is now called Fever Racing. I will keep everyone posted, this shop sounds very knowledgable and I am confident they will properly tune my car.

I have no words to describe my experience at HP. I would never go back.

Sorry to hear of your past troubles. Hopefully you're in good hands now.

I am in Orlando looking for a top quality tuner in the area, so I am very interested in hearing the rest of your experience!