Ok guys I have had my car back from the the shop for a couple days now and I decided to try out the tuner pro by plugging in my headphones to hear for detonation and gues what there it was. Without the headphones I try and I try but I cant hear any detonation. Does the tuner pro just pick up very minimal detonation and I shouldnt be worried about it or is there supposed to be absolutely none at all?

 

OK im sorry just a quick question. This may sound dumb what is detonation and how do you know its happening to your car. Anybody know how its suppose to sound. Let me know thanks

 

its sounds like sand being thrown at a piece of sheet metal. I believe whenever it occurs the more serious detination little crack form on your pistons

 

o ok thanks

 

I hope and believe others will chime in here. I am far from an expert but do have an F.I. 350z so this is of interest to me as well.
Detonation should not be happening in your car. A solid tune is supposed to eliminate any detonation is my understanding. Detonation damages your motor at the very least until it destroys it outright. Depending on how severe the detonation- failure can happen instantaneously or damage your internals until they let go over time.
Detonation has been described as sounding as if your hearing gravel being shaken in a coffee can. I wish I could hear actual detonation so I could know for sure....but not in my car
If I was you I would run some 100 octane fuel until you can get to a dyno to see what exactly is going on with your tune. It could be a bad tank of gas but being that you just got your car back from instll you need to follow up on this. Did the installer dyno your car after install? Lastly...there is a thread concerning detonation and the TN kit. These people might be able to give you general or specific info about your situation as well.
Hope things work out and let us know.

 

Your knock sensor could be picking up random engine noise as knock. Nissan knock sensors are known to be overly sensitive..

 

well actually I did my install and I had a tuner tune my UTEC and Tuner Pro. I just got my car back a couple days ago and he said there was no detonation at all

 

I am not using my stock knock sensor my Tuner Pro came with a knock sensor that reads way past the 5200rpm that the stock one reads.

 

Try the race gas and see if you still detect the detonation. Not that A/F ratio is the only determinate for tuning but what is it through the RPM band? Post up the dyno sheet so people with more experience can give you imput. I'd hate to see you damage your car so soon after the fun should begin. I hope some installers here can give you imput on possible install issues that might be at play.

 

https://my350z.com/forum/forced-induction/163011-well-i-got-my-car-back-from-my-tuner-dyno-pics.html

 

You should be in good hands with those people giving you input.

 

http://www.3si.org/forum/showthread.php?t=281822

 

http://www.streetrodstuff.com/Articl...tion/index.php

 

If you have a utec it should work well at at hearing detonation and pull back your timing. As stated before you may be hearing engine noise. The utec data logs you or your tuner should be able to see whats going on.

 

At what RPM's is it knocking? The dangerous areas are load areas around 3500-5000, if you are hearing knock past that it is probably engine noise. Also when tuning it on the dyno you will hear less noise since you remove road noise up front specially.

 

there should be 0 knock whatsoever.

Do you have a log of the UTEC you can post? Knock is one of things that can be logged. You can also adjust the sensitivity of the knock sensor, as well as how much timing it yanks out when knock is detected. As for the whole "Nissan knock sensors are too sensitive" - honestly miaplaya - they say that about EVERY car. Id rather it too be sensitive than not enough.

 

Knock although an actual event the interpretation is subjective, because if you want no knock at all you will have to set the sensitivity of the knock signal to the max and in the Utec set the knock count to 0 and you will probably be tuning all day and once you get on the road it will probably sense knocking due to the sensitivity.

 

correct....what you are striving for are next to no knock events in the log, or events so minimal, they bare register (ie on my car I get an occassional 1 count, but no even significant enough for timing to be pulled (I use the default utec settings for sensitivity) )

 

Yeap, so basically you have to trust the tuner in that he knows what he is doing and setting the sensitivity properly at the different rpm's and the knock count as well.

Sometimes too much information is not good, to sit and listen for knock might do more harm then good for the owner, the "knock" sensor is not just listening for knock but basically hears any noise going on in the engine which could be from vibrations transferred to the engine, which is why the sensitivity is adjusted so when detecting knock it is really detecting knock and not just other sources this is where the tuners experience comes in to play.

 

From what I read I don't think he is hearing detonation, he is basically asking a question. Truthfully, yes it happens. As engines make more torque they are always running closer to the edge of detonation. With more torque you increase cylinder pressure, increasing cylinder pressures increases heat, increasing heat will in turn push you closer to the threshold of knock. You ultimately want to tune so that it happens as least as possible. If you can't hear the detonation assuming you have an idea what it sounds like, then no worries. You are in good hands with Sam @ GTMotorsports.

Thanks,

Jermaine@turboxs.com