ECMlink Knock after filling up

[AWD-Tony]

I haven’t had knock in quite some time. Yesterday I had less than a 1/4 tank so I filled up at a station I usually go to. Now I’m getting knock as soon as I get into some boost. I’m guessing it wasn’t 93. What are your thoughts? Thinking about putting some octane booster in to see if that’ll help.

What a waste of $35!!

Thanks!!

 

[phr0st]

Yup. I've had bad fuel do that to me before. Drain the tank and get some from another station.

 

[curt-s]

I stopped going to a station nearby that, even though they sold 94, would cause me to knock earlier and harder than when from the same station halfway across the city. I make the trip now. I will even get a couple liters of 91 at Shell just to get me to that watering hole.
I would say set your boost threshold for wastegate pressure, set your CEL to 1 degree if you can, and ride out this tank on partial throttle until you can get better stuff.
Or drain as much as you can into jerrys and use it to run a lawnmower. Thats what I do at the start of every year.

Or you could try the booster. Really its all up to you.

 

[GST with PSI]

This is another reason I swapped to E85.

For you pump gas guys, if you've got an E85 station in your area, you can simply pump 2 or 3 gallons of E85 on top of a full tank of your piss water. A few gallons of the corn will bump the octane a good bit, and shouldn't throw off your tune significantly.

Once you get a taste of that knock free E85 lyfe, the transition is inevitable.

 

[AWD-Tony]

Yup. I've had bad fuel do that to me before. Drain the tank and get some from another station.

Thanks phrost! Really don’t want to drain a full tank. Plus I have no where to store it. Gonna granny drive it until it’s dry. Sucks!

 

[AWD-Tony]

This is another reason I swapped to E85.

For you pump gas guys, if you've got an E85 station in your area, you can simply pump 2 or 3 gallons of E85 on top of a full tank of your piss water. A few gallons of the corn will bump the octane a good bit, and shouldn't throw off your tune significantly.

Once you get a taste of that knock free E85 lyfe, the transition is inevitable.

That’s a great idea! Hope I don’t get sucked into the E85 game haha. I’m sure that’s a game changer and eventually I’ll make the switch. But for now I’m content w knock free 22-23lbs with 16* of timing.

 

[1990TSIAWDTALON]

It will get you! It really does make you wonder what else was hiding under the hood if you go pure corn.
Granny her around or splash her like Brett said, that will cure the octane problem.

 

[1cleangsx]

E85 is what they run in heaven I think. It’s seriously that good. My car on a evo 3 16g went from mild to wild on that stuff, it’s worth every penny

 

[curt-s]

boo to you people with e85. boo i say.

i dont think e85 will ever catch in Canada, it is too energy intensive to produce with inefficient yields.
apparently theyre happy pumping oil out of the ground here, sending it down there to be refined, trucking it back up here, and charging us more for it than youd pay yourself. also, theyd be happy selling e85 on the low of 60% content instead of towards 80 and still charge us that higher level based on the e85 name.

for 87oct we pay about the equivalent of $3.40usd/gal.
head over to vancouver and its around $4.50usd
woo.

 

[AWD-Tony]

Thanks gents!! I have 15 miles on this fill up. I’ll use up another gallon or so and put in the kernels.

 

[DSM 99]

Yeah baby it around or turn down the boost. You guys are lucky with 93 & 94 pump gas around. I’m done with shitty California 91 and am about to switch to E85 myself with the popularity of it now.

 

[AWD-Tony]

1.8 gallons and she’s back!! $4 of corn is probably better than $10 octane booster snake oil.

I’m gonna have to look into switching to corn. Station is only 3 miles right next to the highway.

With link, is there a way to compensate for ethanol content percentage?

 

[1990TSIAWDTALON]

Yes, you will change the stoichiometry ratio in the fuel tab to 9.8:1 (gasoline is 14.7). You have to have MORE fuel with E85 (in the tune).
Some tuning changes you will make but it will drive, just need some tweaking in the tune and you can add some more timing up top to the tune as you progress. I was running 19*, but backed down to 17* to be safe since E85 doesn't register knock.

 

[AWD-Tony]

Yes, you will change the stoichiometry ratio in the fuel tab to 9.8:1 (gasoline is 14.7). You have to have MORE fuel with E85 (in the tune).
Some tuning changes you will make but it will drive, just need some tweaking in the tune and you can add some more timing up top to the tune as you progress. I was running 19*, but backed down to 17* to be safe since E85 doesn't register knock.

Thanks Marty! I have read into a bit. Let's say toes deep. haha.

My question is - Lets say it's tuned on full e85. Since ethanol content in e85 differs from station to station, is there a way link auto adjusts the tune if it was only 70% ethanol.

 

[llxkevinxll]

Thanks Marty! I have read into a bit. Let's say toes deep. haha.

My question is - Lets say it's tuned on full e85. Since ethanol content in e85 differs from station to station, is there a way link auto adjusts the tune if it was only 70% ethanol.

Sure is.

http://www.ecmtuning.com/wiki/ethanolsupport

 

[AWD-Tony]

Sure is.

http://www.ecmtuning.com/wiki/ethanolsupport

Thanks, Kevin! SD, E85 here we come!

 

[1990TSIAWDTALON]

You can actually have it interpolate between your gas tune and the E tune automatically if you have a E85 sensor and someone that can set up the dual tune.
I tried to leave my E tune on the MAX scales and my gas tune on my MIN scales, then told Link to interpolate, BUT MY CAR HATED ME, so I obviously didn't know what I was doing so I keep my laptop handy for just such emergencies as HAVING TO RUN GASOLINE, .
Really, even if your ethanol content is anything more than 50%, it is going to act pretty much the same as with E85, from our experiences.
We do have tuners on here and in the DSM community that can set up a dual map tune, though. My oldest son has his car set up that way!

 

[AWD-Tony]

You can actually have it interpolate between your gas tune and the E tune automatically if you have a E85 sensor and someone that can set up the dual tune.
I tried to leave my E tune on the MAX scales and my gas tune on my MIN scales, then told Link to interpolate, BUT MY CAR HATED ME, so I obviously didn't know what I was doing so I keep my laptop handy for just such emergencies as HAVING TO RUN GASOLINE, .
Really, even if your ethanol content is anything more than 50%, it is going to act pretty much the same as with E85, from our experiences.
We do have tuners on here and in the DSM community that can set up a dual map tune, though. My oldest son has his car set up that way!

That sounds like it should work. I saw that it will interpolate between the min and max oct tables in ecm's wiki Kevin linked above. Will it also interpolate between min and max timing also?

 

[AWD-Tony]

Never mind. They have to follow each other...I think

 

[1990TSIAWDTALON]

Yes, they follow along, both tables.

 

[1cleangsx]

Hey man when I switched, I started at half a tank, and using ecmlinks calculator changed my global after topping off the other half of my tank on e85. I still just go off the gas scale. You still want to see 14:7 ish at idle, and you can litterally sit their and adjust the global up or down as its idling until it’s happy, start tuning on low boost. Even on just a 50/50 mix I was running over 20 degrees timing on my 16g setup But it’s better to start low and work your way up, switching to e85 was one of the best things I’ve ever done with the car

 

[1990TSIAWDTALON]

I fully agree with @1cleangsx !!!!

 

[AWD-Tony]

Thanks guys!! My next major mod is switching to SD. I like the idea of running both E and 93 since I don’t drive much. So my plan is to tune SD on 93 first and then E with a flex fuel sensor. Hopefully I’ll have this complete by the end of the year and make 400 horse puppies. Thanks for the input

 

[1cleangsx]

Good Luck man! Take your time and you’ll hit your goal I think 2019’s gonna be a great year!

 

[AWD-Tony]

Good Luck man! Take your time and you’ll hit your goal I think 2019’s gonna be a great year!

Hell yeah!! Thanks, Jeremy!!