I wrote Tephra 88580714 in my EVO9.
Everything was perfect.. stock map, stock boost 17psi spike.
I was started to increase the boost... I stoped to 27psi spike.
Perfect AFR low 11.. I was happy.

After some minutes without to change something I tried to run again.
Knock cels from 7psi boost and afr 13 and more.. and the car accelerate was crap.

I wrote again untouched 88580714 rom but still the same.
What the f@ck I did?

 

Sounds mechanical to me, I would check to see if you blew off a intercooler hose, or one of your vacuum lines off the manifold...

 

tried to the OEM firmware?

 

Check the vacuum line and intercooler hose.

 

<p>Thanks for your replies!</p><p> </p><p>This was my first thought but when we have boost leak we have very rich afr right?</p><p>But it runs too lean.. </p>
I will check all hoses!!

 

Thanks for your replies
This was my first thought but when we have boost leak we have very rich afr right?

I will check all hoses!!

 

Guys I check all intercooler hoses and vacuum pipes.
I cannot find any problem with them.


As I said boost leaks means rich afr!! And I have very lean afr at around 7psi..


The car spools ok until 7psi but after that it spools very difficult and like crap goes until 12psi.
I felt like intercooler hose but why the afr is lean?

 

Sucking in air between MAF and turbo?

 

I will check it too..

In partial throttle runs doesn't do it very much and I saw max boost 17psi..
So boost leak I don't think so.

I have stock untouched tephra map.
I try to write the previous map that I had but I cannot do it.
It gives an error

 

lean spool on or off

 

Should lean spool be on?

 

Untouched map so I don't know.

Finally I write in the ecu my old tuned map!
Still the same..
Lean mixture..
Maybe something with fuel system?

As I said with 70-80% throttle I haven't very easy lean condition..
With partial throttle I saw 17psi..
But again at partial throttle I had lean condition but not very easy.
Maybe because it doesn't need so much fuel like WOT runs..

What to do now? :/

 

Im pretty sure that lean spool is disabled in V7. When i was setting mine up i noticed start rpm and stop rpm for lean spool were the same which disables it.

I had the same problem you are having when one of the little hoses came off of one of the sensors on the intake manifold.

 

Now I don't have Tephra... I wrote my previous rom so the problem isn't from ecu I think so.

I search all the hoses and I cannot find any came off

Also I tried to run WOT without to stop when I felt knocks..
I saw boost around 22psi so for sure isn't intercooler hose!
The afr at this try was around 14.... I felt many detonations.. Very crap running.. And ofcourse ready for destruction!!

I don't know what to check... MAF? Fuel pump? What the f@ck!!

 

try the pump