AC

iTrader: (3)

I understand tuning for the $59 code enough to get myself started in limping through tuning except for timing. When I search I mostly get the "definition" of timing which hasn't helped me with my tuning. I've attached my $59 bin file and .xdf file for RT for you to look at. I'm mostly concerened right now with just idle. If you playback my log file I'm ALL over the place...I'm confused now. Any help?

AC

iTrader: (3)

Looking for some insight on what I believe is contributing to my idle beeing a bid wacky. My idle is set at 900 in my bin (see attachment) and afr is 11.9-14.00 (I know....pig rich) but idle bounces between 1100-1500 RPMS. I'm looking at my timing table right now and don't understand / know what to try next for my idle range.

gofast51

Timing is moving on you because your idle is fluctuating. As your idle increases and decreases you are moving into different map cells.As you move in and out of those cells, your timing is changing as well. If you have been adjusting your ve tables around idle you will probably find a large difference in the adjacent cells around idle. Try adjusting your ve table around your idle cell so that they are a little closer together both above and below that cell that should calm your idle fluctuation. Then I think you will see where your timing actually is. Another thing to look for on TBI's is that the gasket under the throttle body will burn out over time causing a higher than normal idle.

randy4762

gofast51 I think he is running the TPI as listed in his sig. I agree with you on the timing except I watch which cells it uses to idle and then, I make all the cells exactly the same. Looking at the log file, it seems to idle best at around 27 degrees of timing. I have found that with the other tunes I have done, they all seem to idle better around 27 degrees with a large cam. As for fuel that is tricky. The supercharger blowoff might be letting too much boost in at idle (vacuum line must be hooked up after throttle blades In order to see actual vacuum to open the slide fully to bleed off boost at idle.
I am wondering why the map keeps going over 100 kpa at idle. Something must be a little flaky and contributing to the problem. I would still pull out 12-15% fuel at idle to get closer to stoich. That is, if it is what the engine likes. I think it is way too rich at idle IMO.
I did some mods to your bin if you want to look at what I mean by comparing it with your v19 file.
Randy

randy4762

Actually you are kinda close to me, 71.8 mi – about 1 hour 22 mins.
Someday we should think about getting together for a tuning session...
just a thought.....Randy

AC

iTrader: (3)

Randy, I actually am not running the blower yet. Its installed but I want to tune the engine NA first, dyno and then hook up the blower and re-tune. I've also left the BOV disconnected and checked and fixed all/any vacuum leaks.
I guess I don't understand what advanced vs. retarded timing does and effects. If I did I would understand how it fits into my tune.

Randy, If you're interested in a tune session we (I'll give details in a second) get together at my house on Saturdays for tuning in my garage. What DennisBernal91Z (member here) and myself did was more or less start a regional club. There's about 10 of us and I recently had a BBQ at my house where we had about 8 cars here....good times.

Back to my timing. I'll PM you with my home email so you can forward me the bin you played with. Everything as it was last running in terms of bins,xdfs,etc is attached in my first post. I also believe I'm running pig rich so thats something I tried to adjust in my VE table but got some bad lean pops when feathering the throttle up into 2000-2200 RPMS so I backed off again. Oh yeah, I am running a InnovativeWB02.

randy4762

Here is a little info on basic engine operation.
http://auto.howstuffworks.com/ignition-system1.htm
The article explains it in layman's terms, but does leave out some stuff like how boost affects timing. More on that later.
Randy

AC

iTrader: (3)

Thanks for the timing 101. Makes MUCH more sense to me now. I'm not so sure at this point though what would be "optimum" for my engine. Too much advance is going to cause it to knock correct? What I'm fighting right now are lean pops on a quick throttle blip. First instict tells me VE table but would there also be a AE table affecting this? My log file shows what I'm talking about...the few times my AFR jumps up to 17-19 is what I'm fighting.

randy4762

Have you tried adding any AE? Just wait and see how much you will have to add when the supercharger is hooked up. It is all just part of the learning process. It really is a good feeling when you finally get in sync with what the engine needs, do it, and then it actually works! That is the best part of tuning for me.
Randy

AC

iTrader: (3)

I haven't touched anything yet besides the required to idle. VE, BPC, Spark. My BPC is set at 78 or 79 currently. I'm trying to get it to idle around 900, I figure that will be sufficient for my setup. Unfortunately I'm idling between 1200-1450! I did lean up the idle a bit but the AFR swings alot I mean its always bouncing between 13.1-15.0 now...does it ever "mellow" out?

Brandon2350

AC, I'm jumping in a little late and I wasn't able to open your log file because I'm running a different definition file, but some of your problems sound very simular to the problems I was having with my setup. I'm guessing your running a cam with lots of overlap...which was my situation.

I messed with fuel and timing for more than a month and still couldn't get a normal idle. After trying anything and everything I finally decided to open the butterflys a bit and reset the tps. After about an hour of tinkering with this I finally got a stable idle of 900 rpm and no rich smell, black smoke or fouled plugs at all. I ended up having to open up the butterflys almost 1/8" and set the tps for about 5 counts when completely warmed up and it idles like a champ!