Today was my first WOT run with my 402 TT 05 C6. I picked up lots of retard during the run, ~6 while timing was 10 to begin with.
Could this be because of knock sensors picking up open dump wastegates noise as knock? Tune is 50% scaled and Knock sensor sensitivity was never touched.
My wastegates and dumps are located right at the yellow circle below
Last edited by fe9_fe9; 05-04-2012 at 05:19 PM.
Doubt it. Typically takes something to actually be rattling on the block to induce false knock like that. Might look at your choice of plug, or other things that cause knocking..
Suspect a fuel issue - insufficient pump, high injector duty cycle, or the tune.
How about a log?
No trouble here.
Last edited by Roger Ramjet; 05-04-2012 at 07:20 AM.
Knock sensor thresholds are supposed to be changed to go along with your 50% scale. Make sure to disable BKR as well. This will rule out any false knock and real knock conditions can then be dealt with.
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
what kit do you have?
10deg of timimg seems really low.
G-FORCE Motorsports
1941 CR 129 Pearland TX 77581
281-993-5451 PH 281-993-5421 FAX
www.gforce-tx.com
[email protected]
PCM Tuner LSX and SCT <-> How Much Force Can You Take??
2009 CTS-V 630 RWHP 10.90 @ 129mph
Could be ! I'm using the NGK TR7 plugs.Originally Posted by smokeshow
The reason I'm suspecting the WGs is that they freaked the $hit out of me. They are so loud that I had to let off
I remember someone in other forums was describing it as if you run over a Harley Davidson Bike and it's stuck down there to the end of the run
3 DW 301 in tank
~30% Injector duty
This was the first WOT run so fuel was not perfect. It was ~13:1. Can this lead to ~6 KR? I'm planning to take that up to 11:1 and go from there. I'll be posting logs very soon once I take care of some oil leaks that I found after the run, Diff Shaft seals and some other small stuff
Looking good
Last edited by fe9_fe9; 05-04-2012 at 05:36 PM.
Will do !
A Customized HP Performance Kit.
I know but I'm just playing safe since this is the first WOT I do.
Sweet!! pics if you have time!
afr of 13 could be the culprit behind the knock
30% INJDC?! You need to turn a fuel pump down or something before you wash the rings out of that motor with the spray pattern your injectors are giving you with that Duty Cycle. 55-60% is muey bueno.
Then tune for 11.5 AFR in boost and 14.7 at cruise. I can convert that to Lambda should you prefer.
Lean will cause knocking as will over rich. You're also going to pick up a fair amount of power.
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
nothing wrong with 30% duty cycle.
I slightly disagree. Injector open time should be more just because that's how they're designed to operate under high pressure situations. Theyre much harder to control (not trying to argue, this is just from my personal experience.)
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
13:1 AFR in a boosted car for sure can cause a huge amount of KR
Good luck buddy
EFI Tuning Specialist
Chicago.IL
If they're shitty injectors, sure, they'll perform like garbage. If they're good dynamically matched injectors, it's fine.
It is very possible that it's the wastegates. My buddy's twin turbo 427 2010 Camaro just fired up for the first time last night, and when we took it out to push some boost into it, it would max out the timing reduction from knock as soon as the wastegates would open. These wastegates are recirculated, but the exhaust is disconnected at the end of the downpipes right now, and the wastegates tie back in right before the end of the downpipe. The timing is pretty low and it's at about 11.8 on 9psi, and is still pulling 8* the second the gates open (and holds that timing out). I have to assume it's related to the gates and exhaust setup.
DSX Tuning - Authorized HP Tuners Dealer
http://www.dsxtuning.com
http://www.facebook.com/dsx.tuning
Just say no to bull s***.
IF YOU WANT HELP, POST A FILE!
So after hitting ~11.5 AFR and having meth running, no KR was noticed.
So, Open Dump WGs are innocent
Reply With Quote
