Yes this is an issue - the stock ECU is calibrated against a standard engine. Change *anything* and the knock control may start picking up random noise as knock. Whether it be tappets, cams, a stiff lower engine mount, etc, etc, and definitely if you change the characteristics of the rotating/reciprocating masses - all the "different" noise can induce the stock ECU to retard the timing even if you don't have knock.So if you were forging for example then OE knock control could pick up noise?
Extra features?What other features are you using via the link?? Anti lag?? Launch control?
How is the boost changed from high to low, isnthere a controller of via the water spray
MAF removed - load mapped via boost.
Closed loop boost works perfectly fine for me.
I have true sequential ignition on my Coil-on-Plug setup.
And pops'n'bangs via a second map via the ICS Auto switch. Second map is basically the same boost and timing as the main map except for the low load for mortar and machine gun fire :mhihi:
My Mrs calls me a child. I agree. It's hilarious.
That is all I need. Perhaps Open Loop boost control would be a very slight enhancement and knock control could be mapped, but for my road car I don't deem it as a necessity since I always use Nitro+ or Momentum fuel.
Yeah I know what you're saying.. Its so much better now as it is, I think I'll leave it on closed loop passive..The thing about the Link boost control is you can't just ask it for an open loop (active feedback loop) without setting up the closed loop properly first.
You need to map the boost on closed loop (simple duty cycle mapping) *accurately" for 3 different boost levels.
If you want a boost control of, say, 1.8bar there needs to be an accurate table for duty cycle requirements for 1.7; 1.8 & 1.9 bar.
The Open loop system for 1.8 bar then uses this table as an initial target duty, and then also uses the table as a bracketing system to calculate the correction values to achieve a feedback controlled 1.8 bar so that it doesn't overshoot or undershoot when adding extra random or uncalculated duty to ramp up, for instance, from 1.75 to 1.8...
Hope that makes sense. It is a good system, but just needs the understanding of how it works.
I was thinking the same- I believe Mark means he has Open loop and wants Closed loop.How come you want to go open loop boost control?
Yeah I think their may be a bit of confusion happening:smthumbupI was thinking the same- I believe Mark means he has Open loop and wants Closed loop.
FWIW I'm really pleased with my Link, live mapping and logging are significant improvements over stock. The knock control, like everything else in the ECU is fully tunable and as with many things in life it will only be as good as the person setting it all up.
My opinion is that once internals are changed (forged, bored, stroked,etc) standalone/ aftermarket is needed to realise the engines potential. The standard ECU with a Tephra ROM is still very good but I believe is better suited to a stock engine with bolt-ons.
Hope that helps the OP with the choice