was reading somewhere that the knock sensor can slow timing down
even with little vibration; and lose hp (~10hp) that way??
Is this true?

My JDM engine was throwing codes; knock sensor from my GSR was swaped in..
wondering if this is hurting me? should I unplug and just take the CEL?

 

Yes I do believe it "hurts" the engine... could be wrong but that's what I believe!

 

solution is to unplug than?
had to use a USDM ecu..so it required it..prob could have
avoided a lot of headache if i stuck with the JDM ecu for which
I needed a harness..

this is a JDM type r engine..


Modified by voltageGSR at 11:27 PM 12/20/2003

 

It takes more than a little vibration to get knock retard. You should definitely find out if you are getting false knock readings or if your engine actually has a problem. DO NOT run without the sensor installed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by voltageGSR &raquo;</TD></TR><TR><TD CLASS="quote">solution is to unplug than?
had to use a USDM ecu..so it required it..prob could have
avoided a lot of headache if i stuck with the JDM ecu for which
I needed a harness..</TD></TR></TABLE>

Every ecu needs the knock sensor period. JDM or USDM. Doesn't matter.

And if you unplug the knock sensor, your ecu will have no idea if you're knocking like crazy or not knocking at all, and in order to keep itself from exploding, it'll do the same changes as if your knock sensor was detecting knock.

The solution is to tune the engine so that you don't knock. Thats it. Only solution.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by voltageGSR &raquo;</TD></TR><TR><TD CLASS="quote">solution is to unplug than?
had to use a USDM ecu..so it required it..prob could have
avoided a lot of headache if i stuck with the JDM ecu for which
I needed a harness..

this is a JDM type r engine..


Modified by voltageGSR at 11:27 PM 12/20/2003</TD></TR></TABLE>


knock sensor can be tuned with new v-afc II !

 

how much can I pick one of those up for..need something to tune my engine..
have teh bolt ons; nothing to tune with..

 

I just got a vafc2 and it doesnt do knock, only the safc2 does... whatever though.

 

if you don't mind me asking how much did you pick up the VAFCII for
and from where?

I saw your mod list; wondering what exactly the VAFC will allow you to do;
and how much gain do you expect? are you tuning yourself or having a shop do
it?

thanks!

 

I thougght that only certain ECU's have the knock sensor feature. When you tune a car the tuner usually unplugs it. I know that the P72 ecu has a knock sensor and the P28 doesnt. There are alot of people who run with the P28 ecu. I just got hondata with a P28 chip and still need to order a P28 sockted ecu. Ive heard that some aftermarket pistons can cause the knock sensor to go off and retard timing bcause they are noisy.

 

i have stock pistons for now .. so shouldn't set it off
i read you can chip so that the knock sensor won't go off -
and can also adjust using s-vafc II (new)

i want to upgrade the internals of my ITR so I can run
higher boost when I get turbo this spring. Thinking about sleeving;
pistons; stock arm; toda b cams

any other recommendations?
anyone know with good tuning how much boost I can run on
stock JDM ITR safely?

peace.

 

hmmm... I havent heard of the "s-vafc2", but that would be nice. The VAFC allows you to add or take away fuel at any rpm. Im gonna get it tuned on the dyno because it requires a wideband o2 sensor to accurately change the fuel curve to run a stoich ratio across the board (or slightly richer is good!)

It also allows vtec changeover adjustment and other minor functions... alot of eye candy until you do enough mods to require fuel adjustment.

Picked it up off Ebay for $300 shipped, there some guy on there with a flood of safc2's and vafc2's for cheap.

 

im looking into a J&S safegaurd now to monitor the knock , but I need to research its effectiveness vs. price.

Anyone own, or is experienced with knock monitors???

 

nice; have to pick one up..like you said; need enough mods to
make a difference first

who do you trust to do this tuning for you on the dyno..unfortantely
being in cleveland hurts when it comes to that..plus i'm still learning..

 

Trackmasters in santa clarita, california... they got some 10/11 second all motor crx's and some fast *** other cars.

 

LOL sure..i'll just drive to Cali to get the car tuned

Pyan up in Detriot? only 2 hrs from here

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Devlins 91LS &raquo;</TD></TR><TR><TD CLASS="quote">

Every ecu needs the knock sensor period. JDM or USDM. Doesn't matter.

And if you unplug the knock sensor, your ecu will have no idea if you're knocking like crazy or not knocking at all, and in order to keep itself from exploding, it'll do the same changes as if your knock sensor was detecting knock.

The solution is to tune the engine so that you don't knock. Thats it. Only solution.</TD></TR></TABLE>

To the best of my knowledge...only VTEC motors required the knock sensor. Except for the 92-95 Civic EX. somebody correct me if I am wrong...but I'm pretty sure that is accurate.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by urbanracer98 &raquo;</TD></TR><TR><TD CLASS="quote">

To the best of my knowledge...only VTEC motors required the knock sensor. Except for the 92-95 Civic EX. somebody correct me if I am wrong...but I'm pretty sure that is accurate. </TD></TR></TABLE>

Yup, not all engines come equiped with a knock sensor. Not sure where he got the "every ECU NEEDS a knock sensor" stuff.

 

Ya thats what I was saying.

 

the knock sensor does not lower HP if retarding timing as it can only function to 5000rpm, unless you make peak power at 5000rpm, you will not lose power. to disconnect the knock senor you do not unplug it anyway you ground it out. very badly maintained cars will trip the knock sensor, anyone who builds a motor would omit the knock sensor or find one that filters out the sound of piston slap, preignition is different than slap sound.

 

so in all reality, because the v-afc2 has no knock sensor, everyone should buy a "first gen" v-afc and then a s-afc2 and use the v-afc JUST for vtec... hmm, expensive

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">

Yup, not all engines come equiped with a knock sensor. Not sure where he got the "every ECU NEEDS a knock sensor" stuff.</TD></TR></TABLE>

Crap thats what i meant. all VTEC engines use one.

Then i remembered the p28 didn't use one. So i correct my previous statement and it should read "Any VTEC ecu with the exception of the p28 uses the knock sensor. JDM or USDM."

 

how come vafc had knock sensor but not vafcII?