Hey,
I got a little spark retard, but Im mot sure if its really knock or the knock sensor is too sensitive for superchargerging.
do anyone have expirience ?
pull2.hpl
maybe its the fuel pump with a lean condition at high rpm...working on it.
Hey,
I got a little spark retard, but Im mot sure if its really knock or the knock sensor is too sensitive for superchargerging.
do anyone have expirience ?
pull2.hpl
maybe its the fuel pump with a lean condition at high rpm...working on it.
Last edited by f.creek-ranch; 10-25-2019 at 07:04 AM.
if you suspect its lean you need to verify fueling first
without any specs on the vehicle no one can say what timing is typical
if its a stock 3v with say 10lbs on it the knock sensors would typically allow 22 degrees on good fuel. If the knock sensors are yanking timing down below below 16-17 then probably false knock unless its got other issues. As you stated though if you fuel problems you need to get those resolved first.
decipha @ EFIDynoTuning
http://www.efidynotuning.com/
sorry for that...
edelbrock 1580 with 3.50 pulley and stock pump.
just log new with higher voltage and psi on pump.
knock is even at 1000-3000 rpm max 1* Retard, so I lower the MBT
....at high load max 17-21 degrees are max ....
I saw 30* on SC Mustangs....
you dont lower mbt you lower borderline
that fine sounds like the knock sensor is fine
anyone that shoots 30 degrees to a supercharged 3v is an idiot and shouldn't be tuning.
decipha @ EFIDynoTuning
http://www.efidynotuning.com/
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From the log you posted, you are not getting knock retard. You are getting knock advance, as borderline drops below MBT, the ECU is not detecting knock, so it advances spark to keep it on MBT. Spark will follow the lower of the values, advancing from borderline trying to reach MBT if it doesnt sense detonation.
Looking at your WB, you are actually really rich, compared to what you are commanding. Getting your fueling in open loop correct is very important. Your calculated MAP is clearly being limited at 15.66 PSI, so I would suggest looking over your SD, this can limit your fuel rail pressure as it tries to maintain a pressure differential and minimal flow rate change from the injectors. I would change the 2.75 lb/min in the desired fuel rail pressure high load axis to 1, and the 2.8 to a 1.05. You can also increase your fuel pump desired voltage tables values and axis values, so the pump can actually achieve high enough flow for higher pressures when needed, if you haven't already. You probably will need to increase the flow max as well.
Knock advance.PNG
As far as what to target for spark, here is the MBT table with all the corrections for IMRC and target lambda applied. for the stock NA it targets ~28*. Extend that out in excel using a trend line as the load goes up. You can see it will want to be somewhere between 22-26* depending on how high you are running the boost. If you only added the IMRC correction, it would look like it leveled off at 31*.
This is assuming your fuel doesn't detonate long before this spark advance. IATs/ ECTs/ and many other things can effect that.
4.6 MBT.PNG
Last edited by veeefour; 10-27-2019 at 03:00 PM.
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You have to excuse the internet its difficult to portray my character through text. I'm one of nicest people you'll ever hope to meet. Im the guy that pulls over to the side of the road to help out when I see someone having car trouble. Im the guy that pays for the groceries for the person in front of me at the check out when their card is declined. I treat the homeless to a hot mean and am quick to give the shirt of the back to someone in need. BUT, I'm from New Orleans, LA and as such am a product of my environment. I only have two known allergies; I'm allergic to ignorance and bullshit. I call things how I see it and I dont waste time worrying about whats politically correct or stop to consider someones feelings. I'm honest to a fault. My wife knows if she asks how she looks shes getting the whole truth and nothing but the truth.
With that said Im not here for customers contrary to that the only reason why im here is cuz i was specifically asked to in order to help spread knowledge.
I have nothing against anyone either.
And note i did not call the OP or anyone specifically an idiot. I simply stated anyone that shoots 30 degrees to a supercharged 3v is an idiot and shouldn't be tuning. The only person that should offend is the idiot shooting 30 deg to a supercharged 3v.
decipha @ EFIDynoTuning
http://www.efidynotuning.com/
Im impressed, Murfie......
read this for two hours to understand all of it.
thanks a lot.
That is going to rub veeefour the wrong way.
He obviously has some good knowledge, but lacks awareness of where that knowledge gets fuzzy or ends. He makes bold claims, then refuses to provide a solid explanation, or any data to back them up.
This thread is a great example: https://forum.hptuners.com/showthrea...-BAP-and-DW400
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Feel free to back up your claims that my SD model and my fueling are "wrong".
Until then, people will see your claims for what they are: baseless.
Did you get your problem solved f.creek?
Not yet, waiting for a new Walbro 255 Fuel pump.
but ive figured out, that the fuel pressure gets better by rising fuel flow max and high Limit multiplicator.
the knock can be a Problem from fuel pressure, got max 1* Retard and some advance.
meanwhile I do some fun logging and try some maths in scanner for cold idle and other.
thanks for asking...
if your still using the stock returnless fuel system you have to get a pump specific for its use
boosted 3v's don't need a whole lot of timing. Usually there isn't much to gain above about 16 degrees or so up top in boost.
decipha @ EFIDynoTuning
http://www.efidynotuning.com/
they don't on a coyote you will usually hit knock before mbt on pump gas
decipha @ EFIDynoTuning
http://www.efidynotuning.com/