My evo ix knock sum ok?
#1
My evo ix knock sum ok?
Here is my knock sum at 22psi:
RPM KnockSum
1906.25 0
1906.25 0
1968.75 0
1968.75 0
1968.75 0
2062.5 0
2125 0
2218.75 0
2281.25 0
2375 0
2468.75 0
2500 0
2593.75 0
2656.25 0
2718.75 0
2812.5 0
2937.5 0
3062.5 0
3187.5 0
3312.5 2
3468.75 2
3750 2
3937.5 1
4062.5 1
4187.5 1
4343.75 1
4531.25 0
4687.5 0
4906.25 0
5093.75 0
5281.25 0
5437.5 0
5593.75 0
5750 0
5937.5 0
6125 0
6343.75 0
6531.25 0
6687.5 0
6812.5 0
6937.5 0
7031.25 0
7156.25 0
7250 0
7000 0
RPM KnockSum
1906.25 0
1906.25 0
1968.75 0
1968.75 0
1968.75 0
2062.5 0
2125 0
2218.75 0
2281.25 0
2375 0
2468.75 0
2500 0
2593.75 0
2656.25 0
2718.75 0
2812.5 0
2937.5 0
3062.5 0
3187.5 0
3312.5 2
3468.75 2
3750 2
3937.5 1
4062.5 1
4187.5 1
4343.75 1
4531.25 0
4687.5 0
4906.25 0
5093.75 0
5281.25 0
5437.5 0
5593.75 0
5750 0
5937.5 0
6125 0
6343.75 0
6531.25 0
6687.5 0
6812.5 0
6937.5 0
7031.25 0
7156.25 0
7250 0
7000 0
#5
What is your boost at now ? It seems the worst of your knock counts is on spool up so maybe the boost is spiking too hard.
I would not suggest more than 21 psi on pump gas given your data logs.
My suggestion - LOWER the boost to 21 psi and try a new tank of gas
If its still knocking and pulling timiong at 3,800 - 4,000 you may need a bit less timing and of more fuel there . . . . but first try lowering the boost and some new fuel
As an aside . . . .
It is normal for the cars to pick up some knock count and pull a degree or two of timing from time to time
In this case - it is clear that the car is pulling timing which is NOT desired
This is what the entire knock control system is set up to do
I think the idea is to tune the car on as reliable and representaive a tank of gas as you can find and set it up so on the road it is not knocking and running clean
On a IX this involves balacing a/f , MIVEC and ignition timing to achive a safe and knock free tune which is stable and repeatable under a wide range of operating conditions
The fact that a car may occassionaly pick up a few knock counts is not cause for alarm as the ecu will adjust and pull timing in response
As a tuner, I am noting that the gas supply in many areas is getting very unreliable and inconsistant
I really feel that we are getting real crap gas in many locations and it is becomming more and more difficult to achive great power numbers that customers demand while keeping the car totally knock free on what ever gas the customer may pick up in varying gas stations
IMHO - one of the features which has always made the stock ecu vastly superior to nthe aftermarket soultions like the utec, hydra, and aem ems is that the stock stock knock control is very good and fast acting. the IX is super senstive to knock and can react the slightest of noise.
I would not suggest more than 21 psi on pump gas given your data logs.
My suggestion - LOWER the boost to 21 psi and try a new tank of gas
If its still knocking and pulling timiong at 3,800 - 4,000 you may need a bit less timing and of more fuel there . . . . but first try lowering the boost and some new fuel
As an aside . . . .
It is normal for the cars to pick up some knock count and pull a degree or two of timing from time to time
In this case - it is clear that the car is pulling timing which is NOT desired
This is what the entire knock control system is set up to do
I think the idea is to tune the car on as reliable and representaive a tank of gas as you can find and set it up so on the road it is not knocking and running clean
On a IX this involves balacing a/f , MIVEC and ignition timing to achive a safe and knock free tune which is stable and repeatable under a wide range of operating conditions
The fact that a car may occassionaly pick up a few knock counts is not cause for alarm as the ecu will adjust and pull timing in response
As a tuner, I am noting that the gas supply in many areas is getting very unreliable and inconsistant
I really feel that we are getting real crap gas in many locations and it is becomming more and more difficult to achive great power numbers that customers demand while keeping the car totally knock free on what ever gas the customer may pick up in varying gas stations
IMHO - one of the features which has always made the stock ecu vastly superior to nthe aftermarket soultions like the utec, hydra, and aem ems is that the stock stock knock control is very good and fast acting. the IX is super senstive to knock and can react the slightest of noise.
Last edited by DynoFlash; Jul 15, 2006 at 09:43 PM.
#6
Al, do you think the the addition of more ethanol into the gas is what is causing the varying conditions lately. Over the past 6 months ethanol is up to 10%, at least on the east coast.Sorryt for the ot.
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#8
Originally Posted by 5k6
Ok thanks Al I will try setting it at 21 psi and do some more runs.
#9
Originally Posted by zbomb
Al, do you think the the addition of more ethanol into the gas is what is causing the varying conditions lately. Over the past 6 months ethanol is up to 10%, at least on the east coast.Sorryt for the ot.
If anything you would expect ethanol to help - however I think when they are adding the ethanol they are using weaker gas to reach the same effective octane rating
The ethanol content would alter the BTU capacity of the fuel - generally a 10% ethanol fuel has 3% less BTU capacity of a normal unleaded gas
This means with the same a/f ratio there is 3% less power with a E10 fuel
When racers use alcohol they run 2 times more alcohol than gas as the ideal burn ratio on alchol is mushc richer than gas - this results in more available BTU than gas
With E10 fuel in your tank you will prob have to run the car slightly richer to make the same power which is why with E10 most vehicles loose fuel economy
I am hoping to do some orgazinzed testing of various pump gas with ethanol and pay more attention to specically what kind of fuel is being used in various areas I travel to in order to further refine my remote base flash tunes
Last edited by DynoFlash; Jul 15, 2006 at 11:14 PM.
#11
Originally Posted by DynoFlash
ifv you can see if you can come by my chicago tuning trip in two weeks I would like to take a look at it
I will be in Oshkosh this weekend (28-30) for the airshow but I could come home early if Monday does not work.
#13
Originally Posted by 5k6
OK here is one of the runs I did at 21 psi:
Al do you have the final log for my custom tune so I can see what the boost was at during the tune?It might of been set lower then 21 psi I can't remember.
Al do you have the final log for my custom tune so I can see what the boost was at during the tune?It might of been set lower then 21 psi I can't remember.
#15
Originally Posted by 5k6
AL I could come by on Monday during or after the 11am slot?
I will be in Oshkosh this weekend (28-30) for the airshow but I could come home early if Monday does not work.
I will be in Oshkosh this weekend (28-30) for the airshow but I could come home early if Monday does not work.
Try to come with the gas you will normally be using
In the meantime - try lowering the boost to 21 and a new kind of gas and report back what happens