knock retard at wot

[Swearingen]

Hello

I took the plunge and installed ap Stage 2 MSCAI 91 V1.06, mods are colder plugs, OCC, Cobb downpipe with Cat, MSCAI with air Straighteners, HKS CBE exhaust. I Ran the car with little load for a while, and then datalogged some near WOT. Attached is the data log, there is about 3.5 of knock retard. Any ideas where to fix this.

[Lex]

You have shitty fuel in your area. Either find a different gas station or start pulling timing.

[Blackspeed]

I had problems w/ KR no matter what gas station I tried (93). I ended up pulling timing. I would start with 1/2 deg from 5000rpm and up and see what happens.

[Swearingen]

yeah all i can get is 91 in canada, pulling timing in atr? i am a noob with that. Which table should i look at the knocking table i guess?

thanks

what about octane boost...any body tried that?

[Qtip]

Isn't there a Sunoco in Canada which has 94 octane?

There are four ignition timing tables in ATR.

[Blackspeed]

I personally changed the NO knock high throttle table. Its actually still a mystery as to which tables to change as far as knock vs. no knock, but changeing no knock worked for me

[sean80]

Originally Posted by Swearingen yeah all i can get is 91 in canada, pulling timing in atr? i am a noob with that. Which table should i look at the knocking table i guess? thanks what about octane boost...any body tried that?

Sunoco 94.... come on you are from the land of Suncor and shitty hockey teams that miss the playoffs! Just like me (Toronto)

I had the same problem when I first flashed my ecu. I switched from Shell 91 to Sunoco 94 and gave the ecu a few more kms to learn and now I have no WOT knock.

[Swearingen]

Sunoco is only in Ontario, Alberta seems to only have 91 as there high test. Since i just put the plugs in 300 kms ago i am going to try some race blend octane boost... found that on the cobb forums. We will see...hopefully it is just bad gas. Everything else in the log looks pretty good to me... but i do not know!

[Andrew85]

Originally Posted by Swearingen Sunoco is only in Ontario, Alberta seems to only have 91 as there high test. Since i just put the plugs in 300 kms ago i am going to try some race blend octane boost... found that on the cobb forums. We will see...hopefully it is just bad gas. Everything else in the log looks pretty good to me... but i do not know!

Go to Mohawk or Husky dude... 94 octane..... Silly Flames fan :P

[Lex]

Ethanol blends are best against knock. Chevron although they advertise 94 octane in most cases is shitting than 91 octane in the states. Go figure. And I pay 1.32/litre (thats $5 a gallon folks) for that shit.

[Swearingen]

thanks for the tip... wife used to work for husky lol was told it was crappy gas... but i will give that a try tomorow. Yeah a flames fan....got to hang my head in shame...we didn't even get a good draft pick. Had no idea ethanol was good against knock.

[Andrew85]

Haha, well the most knock I get now is .7 I like husky gas There's a hot chick who always rings me up, she likes my ride :P hahaha

[Qtip]

Originally Posted by Andrew85 Haha, well the most knock I get now is .7 I like husky gas There's a hot chick who always rings me up, she likes my ride :P hahaha

Perfect, more reason to get the 93 octane now.

The ATR guide says that as long as your knock is below 1 at WOT then your engine is happy. But knock under 2 at WOT is okay. All taken from the ATR guide.

[Swearingen]

just an update... thanks for all the tips...put in husky 94 no knock a little bit at 0.7 but running great...pulls like a freight train lol

[Lex]

Your LTFTs will go up a little with E10 and you will get slightly less mileage on the ethanol blend. But knock will be lower. Ethanol blends have higher octane and ethanol added to the gas is cheaper so it's a win win for Husky/Mohawk. Some car fuel lines etc don't like the ethanol however.