I thought that it was time to get into tuning with the new heads/cam combo I recently installed. At first I tried to go with a pcmforless chip and was very disappointed. First time at the track with their bin it ran a 16.83. Down right depressing for the mods

I then got an ostrich from moates.net and tried to run the ARAP bin but it seems like its got too much timing in it for a 305. It managed to get me down to a 16.29 with knock retard pulling out up to 3* timing.

So now I'm trying out the AUJM bin, i am picking up a few knocks here and there. But I cant tell how much spark its pulling while datalogging with tuner pro. Enclosed is the most recent data log session. It appears its going rich during cruise. Other then that I think the BLM's are in order. The cam is a lunati voodoo 213/219 .454 / .468 flat tappet. I'd think that I should at least be clicking off some low 15's.

CSV Datalog Last Session:
http://www.mhtg.net/Tune/AUJM1.csv

AUJM Bin Im using:
http://www.mhtg.net/Tune/AUJM%206E.bin

RednGold's .xdf file:
http://www.mhtg.net/Tune/GTA%20165%206E%208-28-06.xdf

Does anyone have any suggestions as to what I should do to get some more out of this combo?

 

alright, i'll take a stab at this one.

first, your cam is mild enough that a stock calibration should work "OK" for you, better than a 16.2 anyways. You'd certainly benefit quite a bit from tuning, but you should at least be able to make it down the 1/4 better than a 16.2 on a stock chip.

So, lets talk about your car. how well does it run subjectively? are you having other problems, or does it seem great except for the poor track showing? What was your 60' time and mph etc.? can you paste in a scan of the timeslip? How does it run going down the strip? is it belching black smoke, does it stumble? What do you run for an ignition system?

How's the transmission? I've seen failing torque converters really sap power and cause poor performance.

Basically you're really down on power and my gut feeling is that the tune is not your #1 contributing factor - something else is wrong.

But back to the BIN...

Since ARAP seemed to work best for you, I would suggest staying with it (don't keep changing from stock bin to stock bin, pick one and start tuning on it). Go back to ARAP, set the injector size properly for your injectors, and go from there.

 

Here is what it says on the time slip:

R/T - .135
60' - 2.460
330 - 6.928
1/8 - 10.540
MPH- 68.30
1000 - 13.654
1/4 - 16.299
MPH- 85.61

Obviously the 60' is pretty bad, i've ordered some boxed lca's and relocation brackets that might help a little.

The car itself seems to run great for daily driving, no codes, starts easily...etc

The ignition is all stock, replaced the module, rotor, and cap with just oem parts.

Going down the track it doesnt dump smoke or stumble. Kind of seems like it looses some power in the upper rpm's in 2nd and 3rd gear.

How would you go about knowing if the torque converter is going south? I've got a transgo kit for it i plan on putting in, in the next couple of days. The rear end has been freshened up, so I think its probably somewhere in the trans im loosing power.

Whats kind of weird, is before I started with the head, cam, intake swap it used to chirp the tires out of the hole while driving around town. Afterwerds it wont do it.

As for the ARAP, I get quite a few knock counts and it will pull as much as 3* timing out at different points. Whats the best way to go about decreasing the knock? Just pull timing out of the SA table according to the datalogs where it pulls timing at specific load and rpm?

 

yes, that 60' is hurting you. Run a 2.0 60' and you can expect around 15.6 in the quarter mile. But your MPH tells the real story: you're down on power. A stock 305 TPI should hit 89-90mph, you should be well above that.

As for diagnosing a dead torque converter, well they can fail a couple of different ways, probably a question best asked over on the transmission forum. however, a few obvious things: does the engine rpm climb a lot without much power going to the rear (i.e. torque converter or trans slippage)? Is the converter ballooned, has the stall speed dropped down (more creeping with your foot off the brakes, engine can't rev up at all when you give it the gas / feels bogged down?)

Yes, you can make the ARAP timing table milder. You can either pull timing out where you are getting knock counts, or (for testing purposes, for now) just copy in the timing table out of a milder BIN (like a stock 89 bin for example).