MR. Tim

iTrader: (11)

Mods:

Forge Unos set to 1.5 bar
3 inch TBE

What happens:

In 3rd and 4th gear i spike 1.5 bar and tapper to 1.4 - 1.3. Still needs finely tuned but currently the counts of knock are down to 1-2 in 3rd and 4th. But in 5th and 6th gear, i spike to 1.5 bar HARD and holds and this is where i am getting my 36 counts of knock. Its audible as you can imagine. This happened in 6th gear, cruising at about 60mph @ 2700 RPM and then going WOT (still in 6th gear, from about 2700 RPM).

Variables:

Shell 93 octane (when i was stock, this gas eliminated almost all of what little knock there was)
AFR looks ok via my Innovate Wideband
Outside temp was at low 50s, sunny
Flat road surface, if anything a slight downhill grade

Notes:

This exact tune was on another 06 MR with similar mods and had no issues. Re-uploaded my stock tune and all is ok again. I get no more than 1 count of knock. Ive turned the boost back down so that in 5th and 6th, i will spike about 1.4bar and fall to 1.25-1.3. In 3rd and 4th i will spike about 1.35 and fall to about 1.2.

I dont understand why the ecu didnt sense the knock (i heard it) and default to the low octane map. It just pulled timing down to about -7. Is it possible that i overboosted in 6th and caused the knock? I doubt i damaged anything since the 36 counts of knock lasted only about 1.2 seconds. Comments/Suggestions?

red evo8

iTrader: (58)

you doubt 36 counts hurt because it was only 1.2 seconds... do you know how many rpms that is

l2r99gst

iTrader: (2)

I think you are misunderstanding on how the ECU responds to knock and the low octane maps.

The low octane maps are sort of like a long term knock trim. The ECU will begin to interpolate to the low octane maps after you get sustained knock counts of 6 and above. It doesn't automatically switch 100% to the low octane maps. The octane number decreases the longer your car is consistently knocking 6 counts or greater. If your octane number reaches 0, then you will be completely in the low octane maps.

Since this method is slower and more of a 'knock trim' type failsafe, the ECU also has an immediate knock correction factor. The ECU will pull roughly 1 degree of timing for every 3 counts of knock. This is done immediately. So, in the places where you had 36 counts of knock, your timing map probably called for +5 degrees of advance and the ECU subtracted 12 degrees to take you to -7.


Eric

MR. Tim

iTrader: (11)

Yes i do - it was a change of 282 RPM. It occurred between 2593RPM and 2875RPM. Your point?

l2r99gst

iTrader: (2)

Mr. Tim,

Did you load someone else's tune into your car? If so, you can see why that isn't a good idea. My guess why you were knocking so bad is that the tune called for too much advance at the load and RPM that you were hitting in 5th and 6th gear. Never use someone else's tune. Just tune your car youself by doing a few pulls and adding in timing a little at a time.

Also, as far as red evo8's comment, he is saying that the knock occurred many times during that 1.2 seconds. At 2700 RPM, your engine is going through a full revolution every .022 seconds. Or, your engine is going through 45 revolutions every second.


Eric

Sky Evo X

Why would you do that? You're putting too much load on the engine and causing it to overboost.

The solution? Downshift.

evokel

iTrader: (10)

you need meth..haha

Sky Evo X

Meth won't save him from driver error. lol

justboosted02

iTrader: (31)

his tune should be able to take WOT in 6th gear

spdracerut

iTrader: (2)

Just have to turn down the boost. If you go back to letting the ECU control the boost, you can run different boost levels at different rpm levels. On my car, I have to run lower boost levels from around 3500-4000 rpms (peak torque). I have the boost increase once past 4000 rpms.

DynoFlash

iTrader: (91)

I love it when people wioth a $30,000 "investment" borrow tuning maps from others to save the cost of a professionaly set up base map.

To each his own

taenaive

iTrader: (20)

Delete. Sorry.

MR. Tim

iTrader: (11)

Well, i atleast got some help from this thread. Thanks to those that had suggestions. I dont mind getting flamed but atleast offer some sort of help to the subject at hand rather than say meth or a driver mod. Al what would you say if this base map was one of yours?

nothere

iTrader: (23)

ouch^

but.. I keep starting to post but erase it, although a tuner might tune for a low rpm, high load like sixth gear and < 3k rpm @wot, that doesn't mean you should be driving around like that unless you are looking for issues. maybe you were

so, lower the timing way over on the right side of the map in the 2500 and 3000 cells.

red evo8

iTrader: (58)

is that you probably either damaged something or weakened something.imo