ok im getting 8 degrees of knock retard at certain points through my upper rpms, how do I eliminate this i do have hp tuners im unsure of what to adjust ive heard backing off timing sometimes helps
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
You eliminate knock retard by eliminating knock, duh
Yeah, pulling timing will help cool cylinder temps a little. You could also run a higher octane gas or up the alky injection nozzle.
fortune cookie say:
better a delay than a disaster.
back down the timing in those areas of the map.... i'm not sure what would be considered "ideal" knock retard for an eco because obviously real tuning is somewhat new for you guys... 1.8T guys normally shoot for a max of 3 degrees KR, but that won't necessarily be ideal for an eco. But anyway, post up the datalog so we can see where the KR is coming into play. It could be you need more fuel in those areas, it could be you need to retard the ignition some, it could be both. Does the KR come in consistently after a certain point (in a somewhat predictable curve?)? Or is it sporadic/random? If its the former than most likely you need to back down the ignition advance along that curve, if its more of a random thing I'd say its more likely to be a problem with something driveability-wise, maybe a plug gap thats off or something along those lines. Thats what normally causes random appearances of KR on the 1.8T but clearly the same rules don't necessarily apply to the L61.
Arrival Blue 04 LS Sport
Eco
Turbo
Megasquirt
'Nuff said
well i already run 93 so thats not the problem
its pretty consistant on every run past 5800 i havent seen a data log yet of mine that hasnt shown knock
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
My first thought would be to ask you to run some unleaded race gas. 100plus octane. See in the condition still exists.
I have seen a dirty K&N induce knock. Seriously.
If you run the car relatively cool, does the condition still exist? Or does it get worse with consecutive runs
Is the condition new. Are outside temps much hotter lately?
I have seen a bad injector do it.
Does it still happen with your alcohol?
Just a few thoughts to go along with what has been said.
Since cars runnning higher octane can build carbon, you might need a top end clean. Decreased flow car certainly cause K.
How's your cat?
I would do anything before pulling timing. Your pulling power.
well im not driving 60 miles to a track for race gas
I seriously doubt the air filter has anything to do with it its not even dirty
The condition exists at any temputure
Its been going since october or before
alky makes no difference on or off still does it
top end being dirty might be a possible the car has 90k on it
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
I didn't realise race fuel was that hard to get there. The reason I ask is that it can be definitive when considering false knock. Knowing this before going though everything is helpful.
I'm suprised it's going on with the alc. Hmm.
Shifted
Today 9:12 PM
Could also be a loud motor
Or A loose nut behind the wheel.
yea the entire car is loud, theres nothing quiet on it
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
Higher Octane fuel or dial back your timing.
You don't have to go to the track for high octane fuel. Try a couple bottles of NOS Brand Octane booster (The race version). And yes it works, just make sure it says that the octane booster has MMT in it.
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'97 Z24
2004 JBO Bash Quick 8 Qualifier
well the alky injection should boost the octane level by itself, i do want the car to run right on regular 93 octane
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
well for like 20 bucks now, you can go to an autozone and get N0S Octane booster, this claims to boost octane by 60 points or 6 whole octane. So you can try the 100 Octane gas and see if its false KR or not.
2006 Black Cobalt SS Supercharged G85
13.91@102.77
you still got that dinky M2 water injection injector? get a M4.
ill upgrade to a 150psi pump before i get the bigger injector
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
if you have all the mounts in the car , try putting all the stock 1's in and see if that changes it
in my cav i would see 6-8 degrees on 91 , and when i put 101 in the tank , the knock droped off almost completly , in cool weather
basicly you need to find out what is the cause , before you can impiment a fix for it , race gas is usually the easiest way
if your not seeing the knock tell 5800 , you can try and pull 2 degrees from 5600-5700 up to redline , then once you see 0 , then step back up tell you just slight knock
and do it with out the alky , and just the 93 or 91 , that way you know adding the alky back or a higher octane will eliminate it all
I'm getting 2-3 knock counts on my N/A 2.4...... but then again I do have Poly mounts all the way around..... I've gone from 89 oct. to 93 oct. w/o much of a change, 50*-90* intake temps, no change....... I'm thinking its just phantom knock from the solid mounts....... maybe your car is the same? (cant say for sure, since you have the Eco, and a S/C)
I'm going with the others....... add some high oct.... or oct booster.......
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'02 Z24 420whp
SLO GOAT -
'04 GTO 305whp
W41 BOI -
'78 Buick Opel Isuzu W41 Swap
A water injection injector is 8$, 150 psi pump wont help much. M2 is too small.
It has been proven on GTP's, grand nationals and srt 4's, that it will reduce knock.
i also agree about the soild mount therory.
good luck.
it's funny hes getting 8 degrees of knock retard at 6 psi and I am getting none at 9.7 psi.. well every once in a while I see a little bit.. butt hat could be because I never took the knock sensor rubber dampner thing off from when I had my cams...?
LE61T PTE6262 Powered
If it proves to be just vibrations, I've heard of people putting crush washers under the knock sensor to dampen the vibrations. Still may be a good idea to pull the timing slightly in that area.
Cardomain|
Myspace
Phil did you ever check that
you said butt hat....huhuhuhhuhuhuhuhuhuhhuh
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
we are going to take some data tonight of Philbert's car and see how big his knockers are before adding some spark
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
ccan't you put some teflon tape on the threads of the sensor to help it a bit ? somehting to think about
Rodimus Prime wrote:we are going to take some data tonight of Philbert's car and see how big his knockers are before adding some spark
HAHAHAHAHA....see how big his knockers are.....lol
you scratch my ride IMA EAT YO CHILDREN
