I'm going to try and pull off my friend's MR BOV and put it on my car and drive it around to see what happens.

 

he said "Scary lean" if he's not boosting then it would be scary rich.............................................. ....................... so im lost maybe something with your fuel

 

Yo Jeff,

I posted the data pulled off your car earlier tonight and posted them on my tuning thread here:

https://www.evolutionm.net/forums/sh...d.php?t=309042

Hope this helps!

`Gus

 

3rd Gear Pull Result - trouble
In Jeff's car, the Mitsulogger initialized successfully and created a new file to begin logging. Everything seemed just fine. I asked Jeff to put the car in third gear, and start a pull from 2500rpm. He hits the gas and mashed the pedal to the metal...we waited, and waited, and where's the boost? Looking down at the datalogging software, RPM reads 0, Knock Count reads 243, and AirFlow reads 0! Something is going on here.

There were two issues we were combating here. First, Jeff's car wasn't accelerating like it is suppose to, and the weird thing is neither of us could hear the turbo boosting. Could it be boost leak, stuck BOV, or the car being stuck in limp mode? Second, the datalogger wasn't recording the values correctly. Amongst multiple mis-readings, I noticed the following repeating errors:

* RPM values goes to 0 as it goes beyond 4000 rpm
* AirFlow values goes to 0 as it goes beyond 793 Hz
* AirTemp is stuck on 360F (it's FREEZING out)

Graphs
Because we didn't have RPM's beyond 4000rpm, I couldn't accurately compare my data to Jeff's. In the end I salvaged what was available and rendered the following graphs. Keep in mind I used Log Unit instead of RPM to complete the x-axis of the graph.

Timing Advance Vs Knock Sum Vs Narrow Band O2 (1)



<2700rpm-redline in 3rd gear>
The first thing I wanted to know is, how does the muffler delete affect the Air Fuel (A/F) mixture? Because the modification reduces exhaust back pressure, the end result is air can enter the intake easier. Since Jeff's ECU has not been reflashed, under open loop conditions (WOT), the Narrow Band O2 sensor should read "leaner." In my opinion, it certainly does read a bit leaner, as you can see that it oscillates between 0.940V and 0.942V several times before settling on 0.940V.

Something else to note is, 2 counts of KnockSum value was immediately present occurring as soon as Jeff slammed on the gas at 2700rpm and dropped to 0 at 4000rpm.

Timing Advance on the Evo8 was very impressive indeed. If you compare his values to my MR, you will find that at redline the Evo8 held 25 while the MR only had 16 degrees. I suspect this has something to do with the MIVEC.

Timing Advance Vs Knock Sum Vs Narrow Band O2 (2)



<2700rpm-redline in 3rd gear>
At the point when we logged this 3rd gear pull, Jeff's car was already showing signs of sluggishness. You can see that there was something really weird about the Narrow Band O2 value at the beginning of the pull, dipping dangerously into 0.080V for a while before skipping to 0.760V and climbing to 0.940V at redline. You can also see that his Timing Advance value experienced a dip at approximately 5000-6000rpm range to 13 before climbing up to 23 at redline. KnockSum was recorded at 1 count at redline.

Summary
The whole experience was a tuner's nightmare. I wasn't able to read majority of the data and the car couldn't product repeatable results. Next step? I'm going to research on the aktivematrix forum to figure out why the dataloging program is mulfunctioning, and at the same time help Jeff troubleshoot the Evo8. Ultimately I want to be able to:

* Compare AirFlow values to see which car pulls higher Hz across the rpm range;
* Compare Load value to construct correlation amongst Load, Torque, and Boost;

Wish me better luck next time!

 

From the data, you can tell that your NarrowBand O2 reads ok (even though it's not the preferred method to understand air/fuel mixture).

A few weird things I noticed is (on the second graph) your timing advance value seemed to lower at around 5000-6000 rpm and following that the knock count showed up. The A/F ratio was still ok, but maybe the combination of timing pulled and the knock caused the car to feel sluggish?

I would do a boost leak test right away and you will find out what's leaking and what's stuck real quick.

Sooner or later you WILL be in SM class, so might as well get that TIAL BOV and sound like Daddio!!!

`Gus

 

in response, I will add that it was off, than all of a sudden you heard the turbo and the BOV and it ran great.. than it went sluggish again.

So damn weird!!

 

what mods do you have? And to understand this correctly, you are building 0 boost when its running very slow? Have you checked the maf, intake etc? I had a similar problem when running stock air box, the snorkel was missing the two tabs holding it down, under some load it would suck up against the hood. It would happen randomly, put the tabs back on and never had a problem after that. Oh and I used to live in Rocky Hill, nice area

 

great suggestion! I'll go outside now and check everything out.

 

No, because when that happens the car loses it's MAF input and it has no idea how much air is going through the motor. With a stuck wastegate, the car would run ok because its still getting the correct reading from the MAF.

The messed up datalogging sounds like IT trouble. Bad flash maybe?

 

OK. The intake is secure; I even drove with the hood latch unpopped.. still no boost.

the car literally sounds fine, no hissing etc., just no boost at all. the intake is securely mounted on the turbo.

 

Hi Solo II Evo,

I have the exact same problem with yours one. Car suddenly has no boost at all. Sometimes It can run like normal and pull really hard (boost up to 22psi) but most of the time it does not have boost.

Have you found out a solution yet ?

My car is Evo 7 GSR.

Thank you

 

7 years!!! I'll be amazed if he comes back from the dead to reply.

 

It's driving me crazy. Car is so slow now. Do you think a Dyno tune can fix up this problem ?

Thank you

 

Stock evo 7 turbo? Some more information about the modifications done would certainly help.

 

Mod:
Full TBE
Evo 9 BOV
Rubber intake pipe + K&N Pod
Walbro 255lph
SpoolinUp COP
Everything else is stock.

I have the Evo 9 Turbo, O2 Dump, Front mount intercooler, Exedy Twin HD Clutch laying around and have not installed yet.

Thank you