J&S "Safeguard" individual knock control system...

[TurboBob]

all valid points,

i wish someone would come up with a boost retard for knock control instead of just timing

stock ecm has this, but dropping boost is too slow to really do the job.

Bob

 

[davelostmissing]

stock ecm has this, but dropping boost is too slow to really do the job.

Bob

A big solenoid on the wastegate?

 

[TurboBob]

to get a big change in boost (like several PSI) will take several hundred milliseconds. Timing retard is much more immediate.

But its easy enough to set up a test and log it on the PowerLogger. We just have to decide the threshold and kick a solenoid output.

Bob

 

[kidglok]

maybe something that can pulse an aftermarket boost controller like and ams1000 or msbc1?

or pulse the decrease solenoid?

 

[HighPSI]

Like Bob posted above, since it's a mechanical device, lowering the boost will take way to long. I have succesfully tied the AMS decrease input to the XFI traction control box. The boost takes a few tenths of a second to lower and once the traction control is complete, a few tenths for the boost to come back. Depending on the severity, this usually costs a couple tenths in ET but is almost always quicker than pedalling the car. Obviously, the timing retard has to happen much, much quicker.

 

[HighPSI]

An engine rebuild is more expensive than a $600 dollar controller.

You have mentioned this a couple times. I'm curious, do you run a high dollar ecu? Does it have individual cylinder timing?

 

[TTipe]

You have mentioned this a couple times. I'm curious, do you run a high dollar ecu? Does it have individual cylinder timing?

I have some experience with controls and "base engine" at GM.I have a traditional Sequential Fast which I'm getting comfortable with.I may get an XFI very shortly however.I wish I could run ETAS/Inca on my Regal.

 

[The Radius Kid]

I wish I could run ETAS/Inca on my Regal.

Oooooh,I love it when you talk dirty.

 

[TTipe]

Oooooh,I love it when you talk dirty.

On center,on center,on center!!!

 

[The Radius Kid]

On center,on center,on center!!!

I thought you were "off" ......... uh center that is.

 

[TTipe]

I thought you were "off" ......... uh center that is.

Don't tell Mom & Dad.

 

[norbs]

OK guys this is getting off topic, get back to the proof that this unit works...........

 

[The Radius Kid]

Don't tell Mom & Dad.

Okay,you machanical devient.

 

[The Radius Kid]

OK guys this is getting off topic, get back to the proof that this unit works...........

What proof.
In theory,it's a great idea.
In practice,no one has too much experience with it.

 

[kidglok]

OK guys this is getting off topic, get back to the proof that this unit works...........

no ones doubting that it "works" by doing what it says it does.

i just dont think that retarding the timing is the best idea sometimes-
on a launch at the track- this unit is a lot more sensitive, i dont want timing being pulled from a noisy valvetrain that can cause EGT's to skyrocket and potentially melt a piston.

does it log the timing retard? if not how is anyone supposed to know when it occurs?

 

[The Radius Kid]

all valid points,

I wish someone would come up with a boost retard for knock control instead of just timing.

Maybe a logic controlled solenoid channel could be added to this unit?
I wonder if the manufacturer could be talked into this?

 

[The Radius Kid]

no ones doubting that it "works" by doing what it says it does.

i just dont think that retarding the timing is the best idea sometimes-
on a launch at the track- this unit is a lot more sensitive, i dont want timing being pulled from a noisy valvetrain that can cause EGT's to skyrocket and potentially melt a piston.

does it log the timing retard? if not how is anyone supposed to know when it occurs?

I believe it can download that data to a laptop.

 

[TTipe]

OK guys this is getting off topic, get back to the proof that this unit works...........

Try this link and watch JS in action.I don't know how soft the sensitivity is set.It's set on individual cylinder control.

 

[kidglok]

Christmas lights!

 

[TTipe]

Try this one. The unit being tested is the Vampire (for wastespark) less HO DIS.I don't know how sensitive it's adjusted,but qualitative reaction speed is obvious.