How do these logs look?

B6/7 S4/RS4
#11

I would have to agree with you. There is something missing here.

The log you just posted didn’t look anything like the one Beemercer posted a graph of. Ill have to go back and look at that one. This log looks great. Looks like the ECU is doing very well. It just seems that the car isn’t doing what you want it to do. The acceleration on this log isn’t of what you would see with headers. I just loged my header car the other day and Im well faster then you.

Still most of your numbers look the same as mine. IE. Timing and fuel.

#12

the RPM/second isn’t very strong. 525 avg from 2000-7000 is ok, but not for a full bolt ons car with headers. My B7 S4 with full 2.5 catless, a fresh tune (JHM updates the tune all the time so you want to make sure you have the most up to date one) in cold temps with 94 octane Sunoco pump was up around 550rpm/sec average.

Maybe i missed it, but can we clarify the conditions you logged in? You’re in Florida right?

octane
temperature/DA (if you know it)

#13

So overall the logs of the fuel trim look ok? The temp when the logs were taken was about 40 degrees. Altitude is about sea level. Only 93 has ever gone into this car, and only from Shell, Exxon, Sunoco or BP. This particular tank was Exxon. For some reason all of the Sunoco stations near me stopped offering 94 so I never got the chance to run higher octane.

Would it be worth it do have a leak down/compression test done? Is it possible that any of this is related to timing components?

#14

Even the other logs looked good. The ADTC note clearly isn’t the actual reading as the car would have performed much different and the logs would have shown up different.

Tune wise the car looks real strong. The headers and exhaust are doing there job. The correction levels are down and the car seems to be humming along. There is a little bit of a timing stumble but thats normal with a CM FW.

From a log output standard the car looks strong and looks like its running great. From a acceleration point of view the car seems to be down on its acceleration numbers. The header cars with your numbers are well faster then what your seeing.

Its always a good idea to do a leak down and comp test in situations like this. That would be a good place to start. While logs are always nice they are just putting you in a direction. Mechanically the car should have a once over as your definitively behind the point of where you should be per all the other cars with your mods.

#15

Bump!

Having my car leakdown/compression tested within the next few days. Anything else I should check out/log while I’m doing this?

I’ll update the thread again once I have all the numbers

#16

Looking forward to the results. Good luck man!

#17

The comp tests and leak down tests should help uncover some answers

#18

Yeah, I have a feeling everything will come back normal though. Sorry for the delayed update. I had a problem with shipping when I ordered the parts I needed for the test. Now that everything is here I should be able to provide an update tomorrow.

#19

So I finally got a chance to compression test my motor yesterday. Here are the results:
Cyl #1: 165 psi
cyl #2: 166 psi
cyl #3: 155 psi
cyl #4: 168 psi
cyl #5: 161 psi
cyl #6: 157 psi
cyl #7: 159 psi
cyl #8: 162 psi

In retrospect I should’ve disconnected the air box elbow from the throttle body to make sure the TB plate was opening all the way. This is a dry test btw, from what I understand I shouldn’t need to do a wet test unless something looks suspicious. I could be wrong but it seems like everything is within spec for a motor with 71k. Keep in mind my motor burns very little oil ~1qt every 3k miles or so. If these numbers look horribly wrong I could always just run another test.

I attempted a leak down test but had trouble getting the motor to TDC. Is there an easier way other than rocking the car back and forth? There’s more than one bolt on the crank. Also my spark plugs had a little white residue on them, nothing major but more than I had expected. I did however change my fuel filter yesterday morning if that means anything.

#20

^damn, very strong numbers, isn’t your car an 04? Yea id say you have no reason to do a leak own test. It’s nice to do while you’re in there, but mainly as a follow up when something looks off. People more so do dry and wet to see how things are sealing up, but with your numbers you should be strong either way.

#21

that’s fantastic compression.

it’s also not even 1 bar between best and worst

#22

yeah I wouldn’t worry about the leakdown test, its mostly for if the dry numbers are bad to try and diagnose further

#23

Yup, car’s an 04. Previous owner was very meticulous about maintenance/oil changes and so am I. I think the longest I’ve ever gone without fresh oil is ~7k miles.

So the motor’s “healthy” but the rpm/sec are still very very slow…where do I go from here? ???

#24

Let’s assume the motor is fine, What about outside of the motor? Like a bad bearing somewhere in the driveline slowing things down. I know that’s a long shot since it woudl likely have other symptoms, but it’s something to think about.

Dragging a brake?

#25

Def not a dragging brake. I had the car on a lift last weekend when I was changing my fuel filter–all wheels spun freely. Can’t think of any bearing that would be bad either. So I know that I’ve had this problem back when I had the tune, FI dp/cb combo, pulley, and intake spacers. Tyrol Sport in nyc did installed those parts years ago when I first got the car. I’m wondering now if they screwed something up?

I think next I’m going to put the stock pulley back on, run some logs and see what happens.

#26

when you logged the car, what were the conditions? I can’t remember…

also have you re-logged the car since?

air filter, fuel filter, plugs, coils…all good?

Did you log timing retardation (20-21)?

#27

The logs that I posted earlier in the thread were taken when it was about 40 degrees outside. The road is within 100ft of sea level. These were the blocks I measured:

003, 020, 026
003, 021, 027
003, 020, 031 (fuel trim logs are a little farther down on the first page)

Haven’t taken any logs since then, can probably take some later in the week when I have more free time. Air filter was changed a few thousand miles ago along with spark plugs–Bosch 4417. Fuel filter I changed last weekend, the old one had probably ~15-20k miles on it. The outdated coils were replaced via the recall a while ago. Car runs like a top otherwise, no misfires or anything.

#28

Check out your timing. Is your tune an old ass version?

also your net timing (timing - avg retardation) is as follows from 1400-6800

[quote][b]NET TIMING

13.5 (2000 RPM)
20.6 (4720 RPM)
23.45 (6600 RPM)[/b]
[/quote]
By contrast my car on 94 octane in cold weather around 0 density altitude with an updated JHM tune and 2.5" catless + 2.5" fast intentions + LW rotors etc.

19.5 (2040 RPM) +6.00
27.5 (4680 RPM) +6.90
30.6 (6680 RPM +7.15

http://i1207.photobucket.com/albums/bb469/lulz101/LOG%20IMAGES/Mar182011SakimanoJHM93.jpg

#29

My tune was updated with the header file Jan 2011 right before JHM released the revision with LA. Count told me that the software is fine and that I have a hardware issue somewhere. I know that I’ve had this problem since before my header/clutch install so at this point I’m just trying to figure out what it could be.

I’m completely stumped. :frowning:

#30

Finally got some free time to work on the car, got a pretty big update here.

So I took some logs today before I put my stock crank pulley back on. From what I can tell it looks like its running a little bit stronger but more or less the same. I attached the logs to the bottom of the post.

So when I dropped the front end forward to start unbolting the JHM pulley I noticed something didn’t look right… My pulley is cracked in two places!! :o Good thing I decided to swap the old one back in for some testing otherwise this could’ve caused some pretty nasty damage. No idea how it happened, or when. Last time I swapped my serpentine belt was around this time last year, and I didn’t notice any damage at all. A couple months before that was when my motor was out and I know it was definitely not damaged then either. Unless of course it started fracturing from the back of the pulley and I just never noticed?? Also noticed my oil pan gasket has a slight leak, and my valve cover gaskets have a very slight weep along the cam seals.

Any idea how the pulley could have cracked like this?

Anyway, pics:

http://i40.tinypic.com/15i71aq.jpg

http://i43.tinypic.com/2rm2r2x.jpg

http://i42.tinypic.com/35klx75.jpg

Going to put the stock pulley back on and take some logs of: 003,020,026 and 003,021,027. Any other blocks I should take a look at? I’ll post another update later on tonight/tomorrow

LOG-01-020-023-026.CSV (2.58 KB)

LOG-01-003-021-027.CSV (2.82 KB)