I am not really to sure what to do. I had a TN kit installed, RC440 injectors, ji ti exhaust and had everything tuned by the shop that installed it. I am running greddy EU, not the best i know, but i didnt know at the time of the install. My A/F ratio is about 14 when i am cruising, not under boost, under boost, it does not always drop down to 11.5. Sometimes it will run as high as 12.5 and it takes a second to even get to 12.5.
opinions?

 

14's cruising is ok. I wouldnt run any leaner than 11.5 A/F WOT on pump gas/stock block. Have them retune it....

 

Not to bad, You should be ok.

 

too risky, get it retuned.

 

Do you know the timing values? 12.5 does seem lean, but if they compensated by pulling timing it isnt necesarily unsafe.

 

http://www.youtube.com/watch?v=64f76m44uXM
http://www.youtube.com/watch?v=4hUKAzznAyQ

those are two videos i made. They arent the best quality. In one A/F stays at about 11.5 and the other one it makes its way up to 12.0

i think i started in 2nd on both of them and let off in 4th... Maybe its not bad, and i am just paranoid and new to the FI world.

 

Sounds like they need to tune the EU a little more. Keep in mind that if you have some load at part throttle and get a little boost like 1-4 PSI and you don't hit 11.5:! AFR i wouldn't be incredibly worried about it. If you are only making a couple pounds of boost you don't need to be at 11.5:1. Now if this is happening at WOT then i would be more concerned.

 

Took the words out of my mouth.

If its gradually making its way down into the 11's as the boost builds, that is fine. At peak boost, you should be in the 11 range or close. If its trailing leaner towards to redline, it's going to need a retune.

If it were my car, I would ditch the EU, and get the UTEC, which offers complete control over the engine under boost conditions.

 

Hey man,

The Greddy EU isn’t the best choice (compared to the FCON) but it’s a great choice and it is exactly what I was using on my TN kit and it worked great. The EU is a solid piece of equipment that is proven to do the job right.

It looks like your tune is a kinda ‘on-the-edge’ tune for an otherwise stock block 350Z. I didn’t want to take any chances of my motor blowing so I tried to control all the variables in my power which the EU helped me do. On my gauges, at WOT throttle, I was running as rich as 9.6:1. I think the timing was also pulled back 1 degree. I was still capable of beating Vettes, CTS-V’s and Porsches so I was fine with my ultra conservative tune.

If I were you, I would have them dyno tuen if for a more conservative mixture unless you are not worried about rebuilding your motor or parts of it. Cruising at 14 is fine as Alberto stated. At high boost \ WOT, I would try to get it down in to the low to mid 10’s (afr) AT LEAST

 

At least low to mid 10's? That seems a bit extreme to me. I always thought 11.5 to 12.0 range would be fine for boosting. At cruising I typically get 14.7 to 15.2 according to the Zeitronix. As I boost it goes to high 11's (Vortec 3.12 pulley).

 

9's A/F is crazy! Even low 10's on pump is silly, that will cause serious bogging down low and wash out the cylinders. Id be more worried about timing, a rich A/F doesnt always = safe

 

+100000000000000000000000000000

 

Not when you have Cali crap pump gas and hot weather.

The car ran strong back then and runs strong now even with the kit ripped off. The tune worked great for me but I may lean it out just a bit.

 

I disagree, heat and 91 octane doesnt warrant that ridiculous A/F IMO.

 

Even though you are well-respected in this field and know what you are talking about, my car ran great and still does. I don't think Sam would've tuned otherwise if it was harmful.

 

I could see running high 10's, but I agree that anywhere below 9's is a bit ridiculous and probably not good for o2 sensors.

 

I agree I was running 10.5 A/F (conservative) at full boost (9lbs) with a turbonetics/RC440/UTEC?Jic Single Ti setup and when it got hot here in AZ (100+... It was tuned origianlly @75 degrees temp) all we did was pull some timming and she settled down. It runs real well once again. Never had any issues with the A/F ratio in the heat.

He has kinda the same setup as me except for I have the Utec my A/F under partial throttle partial boost is in the 13-12's also then lowers as boost builds.

What does your vacuum read at idle. Are you at a high altitude or cruising on the beach?

Just get it tuned again and have the A/F set-up right. good luck it is a blast to drive!