Lemmiwinks fun.....

[thom337]

Welp, it hasn't been above freezing since Friday. I decided I would log some stuff and try and change some operating parameters. Ended up being able to bump up timing 3 degrees. I had it at 3.75, but on long building gears like 4th when the boost picked up I would hit 9, once a 10.2 and I didn't think that was the best thing ever. At 3 degrees advance I'm usually pulling about 5-7 degrees max in high rpms at WOT. Seems like a difference thats more than the placebo effect, but maybe I'm just retarded. :smack:

My next goal is to play around w/ the fuel trims w/o turning my engine into a molten metal volcano. I'm gonna take it slow, I'm still tryin to figure out exactly whats goin on w/ my AFR sometimes. When I let off the throttle, it often goes to like 1.9, which is like 29:1, but I'm guessing thats just because the TB is closed and the engine is kinda chillin. I'm pretty consistenly running rich...in the neighborhood of .8 or so when the engine is pulling the most timing, but I'm thinkin maybe its trying to stop predet by dumping fuel...wish I had my data to look at now, but its down in my car on my lappy. I think I'm going to start w/ alalyzing what the AFR is doing at WOT when its not pulling timing and make slow changes and work from there.

Does anyone know for channel 8, injector response time, what a good value is? From what I've read the higher it is, the smoother the acceleration, but I don't really know what'd be to high there. I've heard you know you go to high when you get backfire, which I'm guessing is cause the injectors respond so fast to throttle info that the new extra fuel hits the cylinders before the added air, resulting in supa rich conditions.

Anywho, since I got my cable I've been addicted to logging and doing it most all the time for the past 3 or 4 days...its a drug. Suggestions/comments on tuning welcome as always, feel free to call me a retard if I'm doing something wrong. :upyeah:

[Vampire Cockroach]

if you have revo stg. 2 you are most likely running pretty rich because of that... the program is written for the 4 bar fpr but 4 bars is still an awful lot of fuel for the amount of air that is getting pumped

your timing sounds fine right now, sounds like you were riding the knock sensors when you had it set at 3.75 and that is not cool with the engine. To be safe if I were you, I'd even kick it down .25 or .5 ... keeping around the 6's is fine but I just like to be safe. It's not worth the 2-3 extra hp to ruin the motor.

I don't know too much about logging but this thread sounds like its off to a good start

[evan@absolute]

To start you off... when you let off the gas the ecu turns off the injectors if you are over 2k rpms. That will give you your lean values. At part throtle the ecu will run closed loop and adjust the mixture with the o2 sensor so you really can't and don't need to adjust that. At WOT is where the adjustments will do the most. You just can't go too rich or too lean cause then the ecu has to adjust too much at PT(part throtle fuel trims) and will set a code. I don't think you will be able to pinpoint the adjustments with lemmi to stop timing pull here or there with fuel. If you have it bumped up 3 then it will pull some unless you drop the boost or add some h2o/meth.

[thom337]

What kinda of timing advance can you run w/ water meth? 12 degrees or so? That'd be hot, maybe once I get this ticket payed off I'll look into it.

As for fueling, like you were saying, I was just lookin to adjust the fueling on WOT where I wasn't pulling timing, and let the engine do its own dang thang involving fuel loads when I'm nearing knock. Sometimes I wish the sampling rate in Vag-Com was higher, sometimes I won't get a reading for like 2000 rpms and by then I've already shifted...I guess I could log less data at once, but I like having RPM, spec boost, actual boost, timing correction for each cylinder, and then 031 AFR.

[Yareka]

TB is closed and the engine is kinda chillin.
bentley needs to edit their books...decceleration is now known as "kinda chillin":D

good job thom of doing some logs....it is kinda fun but atleast you are watching your logs when you make the changes. Just be carelful making changes on such a cold day, especially when you move timing upwards of 3*. Even though the temps stay consistent, one day blast into the 60s and those 10s you are seeing in timing pull go beyond what the ecu can pull(12*). The most interesting thing to do is log total timing(atdc). When you make changes to timing, and you are happy with the pull in block 20, go log total timing when you make incremental changes and plot those against each other. Thats where you'll find your gains, and hopefully you'll make them up top where the car is lacking. Thats why zooyork is able to pull 240hp from the k03...added timing and meth.

Like evan said....dont look at afr on decel and cruise. Look at it on wot and make small changes in primary fuel from there. 12.5 is your sweet spot but you probably wont see too much of a gain from playing with it. But again, props to you for logging your car to see what it is actually doing. Most tweak and then forget this step.

As for logging, you need to be in atleast 3rd gear to keep the sampling rate from pwning you.

[thom337]

bentley needs to edit their books...decceleration is now known as "kinda chillin":D

Haha yes, fear my intensley technical writing skills.


The most interesting thing to do is log total timing(atdc). When you make changes to timing, and you are happy with the pull in block 20, go log total timing when you make incremental changes and plot those against each other. Thats where you'll find your gains, and hopefully you'll make them up top where the car is lacking.

What channel can I find total timing on? I found the ones w/ engine rpm and then timing1 and 2, and then the next channel is rpm w/ timing 3 and 4.

As for logging, you need to be in atleast 3rd gear to keep the sampling rate from pwning you.

Ah yes, I've been trying trying to do that, but unfortuantely the highest speed limit in blacksburg is 35 haha. :smack: That being said, I've been leaving town most days and stopping on a local highway and then pulling to 70 or 75.

Thanks for the tips man, I appreciate it. :oddeye-hellyeah:

[a4wdhybrid]

you should see my lemmi tweaks :eek:

[Yareka]

Ah yes, I've been trying trying to do that, but unfortuantely the highest speed limit in blacksburg is 35 haha. :smack: That being said, I've been leaving town most days and stopping on a local highway and then pulling to 70 or 75.


also remember that your load in second is not even close to the load you would see in fifth on the highway. Your turbo only spools for a second during wot in second gear. Your turbo is spooled forever in a highway run. VERY IMPORTANT.

[thom337]

also remember that your load in second is not even close to the load you would see in fifth on the highway. Your turbo only spools for a second during wot in second gear. Your turbo is spooled forever in a highway run. VERY IMPORTANT.

Very true, I've found that when you start cramming boost in the cylinders on those higher gears at WOT, the CFs shoot up pretty good. Thats what was causing me to get those 9's on the next setting up yesterday, so I layed off a bit.

Just got back from some logging between classes....temps are in the 50's today and w/ 3 degrees advance I'm still only seeing timing pull highs of around 7.5-ish very rarely, so thats good.

I decreased primary fueling by 2%, and from what I can tell it seems that I'm nearing pretty closely to 14.5-ish when the engine isn't getting pissed and dumping fuel. Really seems to be running well now, maybe we'll see 230 or upper 220's on the dyno if yall can keep it cool down in NC. :grineyes:

Then again, maybe I'll crank my timing up 15 degrees before I dyno and sign that waiver as Donald Duck, then make Evan build me a free motor. :gt-ogb-spank:

[a4wdhybrid]

14.5 when?

under boost should be ~12.5

[thom337]

Usually shortly after I get on it w/ a little boost its around 14.5, once boost really kicks in, it tends to go to .88 or so. (12.9-ish) I'm mainly trying to keep the parts where its on enrich but not much below 14.7 from leaning out before boost really hits, so I figure I'd just aim for about 14.5 there to get it slightly more rich than stoichiometric, and get the rest running around 13-ish depending on what the ECU wants to do. (ie, it enriching at high rpm, high boost, w/ timing pull)

I've heard anywhere from 12.5 to 13.5 for AFR under boost, I guess I'll throw some more fuel at it and see if I can get it near 12.5 under boost, and see what thats like.

[Yareka]

I've heard anywhere from 12.5 to 13.5 for AFR under boost, I guess I'll throw some more fuel at it and see if I can get it near 12.5 under boost, and see what thats like.

you will prolly pull less timing putting more fuel in there. Typically when you go lean(way lean, not 12.9 lean) you'll start to pull quite a bit of timing. I believe ian had this happen on the dyno last time he cranked up the boost on the stock fuel pump. You'll have to find that happy medium between the two, atleast you arent throwing in the 3dimensional variable known as boost, timing, and a/f yet. Thats when you find yourself not sleeping at night trying to find the right mix:D

[a4wdhybrid]

14.0 showed quite a bit of pull :(

-3.75deg on lemmi @ the time as well

~19-20psi

[Yareka]

wow...I didnt know you were going that lean. Looks like I have plenty of headroom for the 17th :laff::gt-bb-chongin:

where are you sittin at right now ian with a/f?

[a4wdhybrid]

leaner is meaner

i saw 11.55 on the wideband this morning @ the top of 3rd gear

fuel trims are still :eek: but a lot better than what it was

[Yareka]

nice...I"m shooting for 12 but if I dont see any power going up from 11.7 or so I'll probably stop. I need to pull back fuel mainly so that I can get my mpg back up....last tank full was right at 19mpg:o

[a4wdhybrid]

if i dont rip on it all the time my mpg isnt too bad..so it obviously isnt too good :gt-bb-chongin:

[Yareka]

well put.....but a 1.8l that gets 19mpg:dunceblock:
I might as well just leave a trail of fuel behind me, or I could just scrape up the resin off my bumper and inject that into the mani...back in a sec:gt-bb-chongin: