Engine Detonation After Mild Tune

[dmr]

i recently got a new turbo (TR43) for my car, and got a mild tune to get good AFR and some power until i get remap or aftermarket management.

my car is making 210rwkw at 15PSI with the timing advanced to 17-18 degrees. the AFR is richly on 10.5 and there's smiles all round.

the problem is i went on the freeway, closed the windows, and dropped it back to 3rd gear to hear for pinging.. and with surprise i heard that tinging metal sound.

how is this so with the rich AFR? a few people have said this is because of the timing? is the timing way too high? what should i do in this situation (apart from staying off full boost)?

Edited June 16, 2008 by dmr

[GeeTR]

Was base timing set correctly? there could be more then then the 15 showing.

Edited June 16, 2008 by GeeTR

[R34GTFOUR]

what fuel you running?

[R34GTFOUR]

also is it pinging coming onto boost or uptop in the rev range or both?

Just stay off the right foot abit, and try not to load it up too much and get back on the dyno

[dmr]

Was base timing set correctly? there could be more then then the 15 showing.

he said the timing was set to around 17-18 degrees.

what fuel you running?

i always use 98

also is it pinging coming onto boost or uptop in the rev range or both?

Just stay off the right foot abit, and try not to load it up too much and get back on the dyno

i've never heard the ping if i flat foot it in the rev range to the limiter. the only time i heard it was when i was at 100km and rev matched to 3rd gear (which was high up in the rev range). i only held the accel down for a second before hearing the pinging so i let go of the accel.

[R31Nismoid]

Probably lacking certain cells on the stock ECU tune, simple as that really.

Without a full tune you cant control what's going on with any level of accuracy.

What it does on the dyno vs what it does on the street can be far apart... only a tune will stop this.

Think about it, did you drop back to 3rd on the dyno? Nope, you loaded up progressively etc.

[GeeTR]

Was base timing set correctly? there could be more then then the 15 showing.

he said the timing was set to around 17-18 degrees.

He did indeed, though I assumed that his figure came from his ECU - (which ever one that is)...

ECU figure is (usually) based on the motor having XX⁰ of base timing...

:Therefor: ECU readout timing, assumes a certain base timing.

10.5 AFR's is the kinda WOT figures you get from timid, unwary tuners imo.

Edited June 17, 2008 by GeeTR

[VB-]

yeah who tuned it? peak power is NEVER made south of 12:1 (as determined by some scientist guys somewhere) and 12:1 is generally still considered a nice safe A:F ratio, and what alot of tuners will aim for. IMO 10.5:1 is rediculiously rich.

does i only ping in the top end? if you can, take a couple of degrees out of it and give it a try again, although 17-18 degrees is pretty common.

before any of that, check base timing, heaps of tuners dont do this, they just start tuning.

[RBwhatever]

So you are running a programmable computer/PFC???