About a month or so ago I started noticing some KR at part throttle, not a lot but between .5-5.5 ST KR on the intercepter gauge. At first the general consensis was a bad tank of gas. So after the one tank went down I filled with a fresh tank of 91 at my usual gas station (7/11 around the corner from me), and the same thing happens, stopped going there and started going to a chvron down the road ( a little more pricey) filled up with their 91, samething ST KR .5-5.5 at part throttle accelerating from 50mph from 1700-2000rpms, filled up a few times there, same thing. Added some octane booster, same thing. Did an oil change, same thing.

Logged on to diablo's forum, apparently the 09 & 10 models are having issues with the 9r07 CROM (which I was running) and the 9r08 CROM was suppose to fix the issue. Updated the tuner and loaded it, same thing only a little less KR now, now its going from 0.5-3.5 KR at part throttle. Logged on again today and apparently the 9r08 "fix" CROM didn't fix the issues on the 09/10's. So I am thinking it is the canned tunes that are ****ing things up but I am not sure, no one with an 03-08 has responded to the post so I dont know if I am the only 3rd gen with this issue or if other guys are experiencing it as well.

So before I drop the dough on a custom tune, can any of you with the DSP running a canned 91 tune log for KR at part throttle? the WOT fuel/timing settings dont help at all as I do not have any KR at WOT, only part throttle.

Also if anyone has any ideas as to how to fix this (again it is NOT bad gas, in need of an oil change, or bad plugs --- I checked all of those and weeded them out one by one) please let me know, I am getting so frustrated at this point.

 

Truckin, most folks are not checking the KR or they are ignoring it. I am having the same problem even using 93 octane with the 91 tune, Diablo is a piece of **** IMO and the custom tune is the only reason I'm keeping it.

 

Ok, so what is KR?

 

Knock Retard. It is when you get detonation (knock) from running too much timing advance, poor quality fuel, or too low of octane to name a few. The knock sensor will then retard the timing, cutting power and saving your engine.

Truckin, a while ago I read somewhere (DT I think) that knock sensors can pick up header noise and result with KR. Are the headers rattling on anything? That may cause the KR????

 

I know on my 04 i have 0.00 on both ST and LT KR but I am custom tuned.

 

Here is a screen shot from a data log I did the other day, nothing on this log was WOT, just driving through town like normal