Okay, a little background up until today's problem. Before the upgrades below, I had an AMSOIL open filter, and 3" Buschur TBE with no cat. I mix about 2 1/2 gallons of 110 in every tank which gives me about a 94.5 octane mix.

I recently installed a Nisei LICP, ported ex mani, ported turbo ex housing, and stainless o2 housing. Once these items were installed I went to do some logging and tuning at 25psi. I noticed that at 6000 rpm's my IDC's went up over 100% and I couldn't richen the car up past these rpm's. The richest I could get was about 11.4-11.5 on my AEM wbo2. I turned the boost back down and ordered a walbro 255, which I installed today. I drove about 100 miles yesterday to empty out the tank as much as possible so I could install the pump today. When I did the install, I had about 1/2 a tank of the blend above. All driving yesterday was fine with little to no knock at 21 psi.

Fast forward to today after installing the pump, I went to log the car at the 25psi and see how the pump had affected my AFRs. Now the car is registering 36 counts of knock at about 3500 rpms and pulling a ton of timing, obviously.

Here is a small portion of the log in xls.

Edit: See next post


It starts to get pretty rich by 3600 rpms, but I don't think it would be rich knock that I am getting since it starts at 3500 with an AFR of 11.9.

Any ideas would be appreciated and thanks in advance.

 

 

Well your log timing looks really odd -- it goes from 8* @3187 to -3* @3500...Did you change your maps at all ?? Look at your timing maps and see if there is a bad transition. (Look at low and high and tell us what values are in the corresponding load cells in each map.)

Oh BTW -- Is your octane back at the ~95 range, if not and 91, that is likely your real problem...

 

The fuel is the same 94.5 octane I always run. Also, the low and high maps in ECUFlash are the same.

 

Ttt

 

ure not logging fast enough... 3100 - 3500 is a big jump...

you should be logging like 10 things max...

 

Hmmm.... Very strange...You're only at 23 psi and having a ton of knock. Can you run the car at 21 psi peak and take some logs to see what is happening? I'd like to compare the two.

I have never seen 30+ counts of knock, so I have never seen timing pulled so much. That said, I thought the ECU migrated towards the low timing map when knock over 5 is detected. Would you please post your Low Timing Map, just to confirm as well. (If you have triple checked, then no need ...) I still think something is going on with your timing that is causing the crazy knock...

Sorry I can't be of more help...

 

Maybe you had a weird logging error (as Tephra points out you should have capture more data)...??

 

I have made sure that the logs are in fact the same. I have gone back to a map that was a little older and had less fuel. I am still getting quite a bit of break up past 4500 rpms. As you can see in this attached log, my AFR's are jumping up and down. I had one suggestion that it looked like fuel is bypassing due to the spacer/grommet. I am going to check that tomorrow, but if there are any other ideas, I would be happy to entertain them as well.

On the log, it was definitely crazy how it jumped that fast. Here is a new one that is more typical of what I usually see (as far as data capture is concerned).

 

i had a similar probelm on my car with the old map. the definition file on my map was wrong and the timing in my map did not correlate to the timing i was seeing in low and high octance maps. i was getting knock similar to you no matter how i pulled timing. i was seeing similar knock that you are seeing!

also, try draining that gas and using full race gas knock should go away and/or try spark plugs.

other than that ur knock sensor could be messed up and your getting phantom knock.

 

The knock is now gone. The log in the above post was after I loaded a previous map, however my AFR's are very inconsistent and the car has a lot of hesitation after 4000 rpm's.

 

good, just take your time and dial back in your AFRs to get it as smooth as you can!

one question, are you on stock injectors? did installing the Walbro help in IDCs?

 

I am still on stock injectors for now. The fuel pump looks to have brought my IDC's down as I went 100% at 6000 and by redline was to 115%. With the pump, it looks like I am about 92% right now, but I really haven't been able to get the car dialed in. There is still a problem with the pump as I am going from 10.5 - 12 and back and forth. I am running down the 240-230 load for 2k rpms, and the difference in values in my map are not that different (i.e. they have little transition from one cell to the next).

I have the pump out now and am thinking about just trying the o-ring and plastic "hat" that came with the install kit as opposed to the stock grommet and spacer to see if that changes anything. It shouldn't but who knows. Maybe the grommet was seated properly in the pump housing.

 

Does anyone see anything weird in these photos that would have caused my issue? Everything looked fine to me. Just to clarify, if using the o-ring and cap with the install kit, we don't use the stock spacer, correct?

 

Stupid double post. Sorry.