Hondata

I have a 11.8:1 comp motor with cams. I started tuning today and have a pretty good tune going, but i'm getting 1.7v of knock randomly at every rpm, and its pulling 10 degrees of timing. I used a b16 basemap for timing, and pulled a few degrees to be safe does anyone have any idea if somethin is causing a false reading or do i have a problem on my hands

Do you have forged pistons? Those could cause a false knock.

I had the same problem with my 12:1 comp. The car was tuned on the dyno with 92 octane and the knock sensor disabled. No apparent problems. On the street with the knock sensor enabled I noticed it indicated random knock. I tired 100 octane and pulled timing and I still got a random knock indication. I think it was due to my forged pistons. I plan to take the car back to the tuner just to make sure all is good. (The car has been sitting during the winter.)

But I would try 100 octane fuel if it is available to you first and see if it changes anything.

i'm runnin factory pistons, but i am tryin to do my own tuning, due to being broke. Next time when I go home i'm goin to pull a few degrees of timing and see what happnes, if it keeps pullin timing i'll just ignore it.

You could disable knock sensor?

how about adding a little more fuel?

i'm using the wideband and i have adequete fuel, maybe too much, i'm not goin to disable it, i don't want to ignore somethin that could prevent engine damage, i don't understand why people do that, not a good idea

I got NA H22A and my knock reading is jumping to 1,7 V as well.
Even before I did anything to the base map or upgrade the engine.
No driving problems, I'll probably try and check it on the dyno wit the knock desabled.

Knock boards are tuned for a specific frequency for the engine that ecu was originally designed. For instance if you have an H22 and are using a knock board that was for a b16a it may register more noise than there actually is.

Knock Board resistor locations:

(All resistors are 100 Ohms - Brown, Black, Brown, Gold)

US P61 - None
US P30 - R15
US P72 - R11, R15, R16
JDM P30 - R12, R15
JDM PR3 - R15 (OBD1)
JDM P72 ...

There are more, but I do not have them at the momment

Spunkster wrote:Knock boards are tuned for a specific frequency for the engine that ecu was originally designed. For instance if you have an H22 and are using a knock board that was for a b16a it may register more noise than there actually is.

So is there anyway to get the knock board to work correctly with forged pistons? I know in my case you recommend that I disable the knock sensor due to the forged pistons.

My old topic: http://www.hondata.net/forum/viewtopic.php?t=4762

Thanks

Forged pistons make noise, there is no way around this. You'll have to disable the knock sensor.

Spunkster wrote:Knock boards are tuned for a specific frequency for the engine that ecu was originally designed. For instance if you have an H22 and are using a knock board that was for a b16a it may register more noise than there actually is.

Knock Board resistor locations:

(All resistors are 100 Ohms - Brown, Black, Brown, Gold)

US P61 - None
US P30 - R15
US P72 - R11, R15, R16
JDM P30 - R12, R15
JDM PR3 - R15 (OBD1)
JDM P72 ...

There are more, but I do not have them at the momment

So what would I have to do to fix it? If I have a P72 I need to replace resistors from P13 or something?
Thanks

im having the same problem with my car but i dont have a forge piston ..
i have a LS/Vtec NA .. ITR piston .. can it be a bad motor ? help

You cannot go by voltage. You need to look at the actual degrees of retard.