Hy

I'm Sebastian from Italy. (sory for my english)I have a wonderful Nissan 350Z with mounted Turbonetics singleturbo kit and managed by Utec TurboXs.

I've tried to get informations about my Problem in all Italian and German forums but nobody could help me.

I saw that a lot of users have the Utec in their cars.

So my problem is that my car has big knocking problems after the turbo is going in pressure between 4000 an 5000 rpm - see this video.

http://www.youtube.com/watch?v=1IrojmegNMA

Utec dashboard see picture.
It shows a knocking korrecktion.

I'm thinking that i filled in my car a really bad gasoline wich probably will not have more than 95 octane. I've used the car since there remain ca. 15 lt. of gasoline and i filled in 100 octane gasoline.

The car runs very rich. A/F ratio under pressure from 10 to 11.7

Now the problem is a little bit better i can push the car up to 5000 rpm but then the problem comes again but not so violent....

Do you think I have a bad Map with bad timings?

Tanks a lot for you help!

 

You are not giving us anything to work on so how can we help you? You showed us a screenshot of the dashboard but that doesnt mean anything. Post some logs then we can help you. It shows there is knock at 4300rpm so do some logging and see what is the A/F at 4300rpm and also what is the timing the ECU is running.

 

Hy here you have a log file with only the most important parts were you can see the knocking.

Log 11 is a different map than log map 3.

I hope this can be helpful.
I'll make a video for the A/F but actually the situation is that I am 14.7 in normal drive, when I push and the Turbo goes under pressure A/F goes to 10. and over 5000 rpm it increaso to max. 11.7.



Thanks

 

Here some other informations.
1 picture the Knock constants settings in my UTEC
2 is the base map from Utec website for Turbonetics kit.

Its more or less the same as my map.

The other pictures are the remaining base settings of Utec.

It's possible that there are some setting errors?

 

If your A/F is correct for the boost level then it looks like maybe a bad knock sensor or a bad knock threshold setting. Do you hear audible knock as well?

And what was happening around 55 seconds? Did you set your rev limiter to 5k or is there a really bad misfire?

 

No I don't hear any knocks like vibrations or something else...
That's the strange thing. Now up to 5000 rpm I can push the trottle down also from 2000 to 5000 rpm with a high gear like the 5th.

No problems...

You know which changements I can make in the threshold settings?

And what was happening around 55 seconds? Did you set your rev limiter to 5k or is there a really bad misfire?[/QUOTE]

Do you mean the video?
After knocking I went from the gas pedal.
Now the knocklimitizer is no more agressive. It feels like a stell.

 

Post a picture of your timing map.

 

My knock constant at 6000-7000 rpm is closer to 65. I think between 5000-6000 rpm it is 75. I have a loud valvetrain with cams. The settings in the UTEC manual are:

idle-2000= 105
2000-3000= 100
3000-4000= 95
4000-5000= 90
5000-6000= 85
6000-7000= 80

 

Normally now if the problem sould have to do with bad gasoline sould be ending. Because I filled in other 30 litres of 100 octane gasoline.

Now I'm having an other doubt. I have changed the old light weight flywheel wit the original.

Because the old light was damaged and I've got a lot of problems with the starting. The starter was slipping over the crest.

Do you think this could generate also a Problem.
There is something special to follow by mounting the original flywheel.

I recieve errors from the crank shaft sensor A after the limitation in the ECU (bad signal)...
Error number P0335
and sometimes error P0444

But the Utec says that the engine is knocking??

 

The timing numbers you are using are quite conservative, especially for 100 octane gasoline (is 100 octane in Italy the same as 100 octane in the US?). I am actually using quite a bit higher numbers than you are at ~7 psi and I am on 93 octane.

The P0335 error has me concerned. That could be the cause of your problems. The crank position sensor is what tells the ECU (and the UTEC) how fast the engine is spinning, so if you are getting a bad signal then you may be getting scattered timing. In fact APS went through the pains of making shielded crank sensor wires because they were having interference problems which was causing scattered timing and ultimately blown engines. Look it up on the APS website, you'll see what I'm talking about. I don't think you can install the stock flywheel incorrectly (rotated) because there is an alignment pin...so my guess is that you damaged the crank sensor. Did you drop it on the ground? I would replace it with a new one and see if it fixes your problem. If you continue to see P0335 do not go into boost until you fix it.

P0444 is the EVAP purge control valve that is mounted on your plenum. You will get that code if the valve is broken, or not plugged in, or if the wires are cut. I my case I get that code because the harness on my Haltech has a broken pin so the valve is effectively disconnected.

 

Thank you very much.This informations helps me a lot.

What do you mean with APS?

The gasoline in Italy I fill it in in Austria (is 20 km from my home) is really 100 octane. So I think I can forgott that the problems are caused from the gasoline.

This is a very good tip. I think it's possible that they damage the sensor or the wiring. I will check the wiring and order a new crank sensor.
Is the sensor near the oiltank?

I asked the mechanic if they are sure that he didn't made errors to install the original flywheel. They sad no becaus there was only one position for orientation for the flywheel...

Thanks

 

Hy today I've found to other thinks wich maybe can make Problem.

1) the turbonetics catalysator is damaged. If I shake it I hear the parts inside knocking and make trouble...

2) I've found a electrical part wich is hanging over the alternator.
It is broken off. Probably normally it makes ground mass on the car becaus he has a brocken bracket..

You have never seen this part before?

 

That part does not look familiar. I am not sure what it is.

Definitely fix the broken catalyst. If the broken pieces inside turn sideways, they will block exhaust flow like crazy.

 

A poor engine ground will definitely confuse knock sensor, and cause all sorts of other issues. The sensors rely on having a very solid ground, shared with the ECU.

 

So I've fixed this hanging part.
In german Forum they sad it's a part from the alternator.

But now I'm sure that the real problem is the sensor because the problems with the singal increase and now I have it also at low RPM's and also by giving gas in N gear position...

So I will order a sensor and hope the problem will be fixed.

The error is alway the same P0335..

Thank you very much guys in advance you helped me a lot!!

I will write once i recieve and mount the new sensor.