Mace cams ordered.

[TJ91]

Originally Posted by lscamaro

Things go boom like that

Lol maybe they tried it and thats what they heard in Russia

[christianmotox]

Didn't some one with a v8 had an issue with the knock sensor and they found out it was the exhaust hittin the frame or something, i remember reading that thread last year or so.
Just throwing it out there.

[BSR-1]

Originally Posted by SC2150

the knock sensors are way desensitized in the tune

So kinda like turned off?

It wasn't too many years ago that there was no such thing as a knock sensor.

[SixCyl]

Originally Posted by SC2150

Yes....amoung other things. Clanking suspension, etc.

But the LLT's we have talked to tuners/dealers of the other suite claim the knock sensors are way desensitized in the tune and that is why the dyno's dont read low from pulling all the timing we see.

So that would explain alot.

No comprendo how a desensitized knock sensor causes false knock? I must be missing something.

[KMPrenger]

Originally Posted by SC2150

Yes....amoung other things. Clanking suspension, etc.

But the LLT's we have talked to tuners/dealers of the other suite claim the knock sensors are way desensitized in the tune and that is why the dyno's dont read low from pulling all the timing we see.

So that would explain alot.

Lets take a step back here.

Base run with mods...258rwhp.

After much trial and error with different cam grinds...282rwhp without a perfect tune. Pretty good stuff.

Car gets torn down again...ported heads go on. Been very slow since then. What has happened since then? Is it the heads causing this issue? I refuse to believe it is all false knock to blame on this. Between the tune, the heads, the cams, or the build itself.....what is going on?

[KalCorp]

Originally Posted by SixCyl

No comprendo how a desensitized knock sensor causes false knock? I must be missing something.

Other way around. He said when tune is desensitized on knock you don't see the issue on dyno.

[Macrackie]

Originally Posted by KMPrenger

Lets take a step back here.

Base run with mods...258rwhp.

After much trial and error with different cam grinds...282rwhp without a perfect tune. Pretty good stuff.

Car gets torn down again...ported heads go on. Been very slow since then. What has happened since then? Is it the heads causing this issues? I refuse to believe it is all false knock to blame on this. Between the tune, the heads, the cams, or the build itself.....what is going on?

Glad I am not the only one that finds this interesting.

[Macrackie]

Originally Posted by BSR-1

Disable the KR and just make sure to run high octane. Maybe?

Sadly nobody is going to pay or maybe no one is capable of building the required tables to turn off the knock sensors and not predetinate. It took me days to build the 3d ignition map for my bike with a program from the ignition manufacture. Simple functional vaccum advance distribtors are very hard to duplicate electronicaly.

Sadly our ecm samples so many sensors and constantly edits its ignition map as designed by oem for emisions. Todays engines are designed to run on the ragged edge of predetination to meet bs emisions standards. Break the coding to read only tps, map, cps and rpm and you could remove the knock sensors. Literaly take your di state of the art engine back to 1980s efi.

I could make a honda 4 cyl outboard run smooth on one cyl by turning off sensors and pulling plug wires. Just gotta stop the ecm from looking for them. If only so easy.

As tracy mentioned some of the "other tuning suites" have desensitized the knock sensors. This is fine in my book if your tune is adjusting max timing based off of other sensors. All comes down to how many tables you draw for ignition maps at the bazillion different throtle, load and rpm settings. After you draw 1000's of predeterminded maps your only need for knock sensors is for the day you buy bad gas.

[kjkjr27]

Originally Posted by KMPrenger

Lets take a step back here.

Base run with mods...258rwhp.

After much trial and error with different cam grinds...282rwhp without a perfect tune. Pretty good stuff.

Car gets torn down again...ported heads go on. Been very slow since then. What has happened since then? Is it the heads causing this issue? I refuse to believe it is all false knock to blame on this. Between the tune, the heads, the cams, or the build itself.....what is going on?

I think the cams are good to go? Haven't been following real closely but I think you are right I think the ported heads are causing all the problems now?

[TJ91]

Finally. Hope they get some great numbers since the false KR is plaguing their work. Have a feeling it will do well on the track tonight

[lscamaro]

If it has great top end, shouldnt the trap speed reflect that? I mean my car runs 14.2 @ 100 with 2.2 60ft and I dont even have full bolt ons

[Macrackie]

Originally Posted by lscamaro

If it has great top end, shouldnt the trap speed reflect that? I mean my car runs 14.2 @ 100 with 2.2 60ft and I dont even have full bolt ons

+1 I ran a 14.3 at 99 with a 2.0 60'. Cai, tune and exhaust on stock tires with temps in the 50's and near perfect da. When I corrected the da it changed by zilch.

[scrming]

Originally Posted by SC2150

Just back from the track....weather was in the 50's & 60's all day, excellent negative DA, but had to wait 3 hours for the first run (oil downs one right after another). Traction control and AH off, good burnout, rear tires at 25 PSI, and just spun on the launch, feathereded it through 1st but still up in smoke every time back on the throttle, 2nd gear some spin but pulled nice w/no nosing over and no sign of KR. Only ran 14.30@100mph though. 2.33 60' (should have been a 1.8 or so if we had traction).

Wait another 1 1/2 hours and leave traction control on.....launched and TC activated, then spin and activate and then I miss 2nd gear so that runs shot. Only a 14.20 @ 100.
1.22 60'.

Track closed. Lots of local camaros and mustangs and mopars out today and nobody got more than 3 runs or so all day where we normally would have gotten a dozen or more.

So not a good day as far as track time.

Runs strong as heck....not V8 tq down low by any means, but as soon as it hits 3500 it pulls awesome.

Jim will put it through the paces back in TX and try it on the dyno he originally used for a baseline and it appears we have most of the KR solved.

I'm assuming you meant a 2.22 secons 60' on the second run, not 1.22 second?

[GretchenGotGrowl]

Post the slips when you get a chance.