DSMLink Issues!!! - Page 2

blcknspo0ln · 06-23-2008, 10:47 AM

I think you need to slow down and zero everything out. You have your global set up for your injectors, but you are adding a buttload of fuel throughout the rpm. Are you just banking on the logger readings being 100% correct from your AEMWB? I would eyeball the actual gauge during a pull, you'll be surprised that the dsmlink reading is probably a full point or so leaner than you think. again, IMO, zero your fuel/timing sliders back out and go do a pull. eyeball your AEMWB and i bet that thing will peg at 10.0:1. start decreasing fuel (don't even bother logging, tune with just your gauge) until the wb starts reading in the 10.1-10.8 region.

mnetwork · 06-23-2008, 10:49 AM

I've done boost leak tests and my intake setup is fine... I haven't touched my exhaust since I did my HG and when I put everything on it was fine. I never hear any exhaust leaks. I'll check that out though... Also, what is the difference between my open WG and an exhaust leak pre-wb02?

mnetwork · 06-23-2008, 10:51 AM

I do watch the gauge all the time, it does go into the 11's and 12's at times like DSMLink is logging...

The first time I ever tried tuning with DSMLink, it went very well. I didn't even touch fuel, I left it zero'd out. AFR stayed in the 10's and I was advancing timing geting up to 20 degrees of timing up top... Then next time I tried I was adding fuel to keep it in the 10's...

blcknspo0ln · 06-23-2008, 11:25 AM

Wait, the actual UEGO reads in the 11's and 12's

Silly question, but is the base fuel pressure correct? I've never once seen a dsmlink car have to go positive with fuel.

LandoAWD · 06-23-2008, 11:43 AM

Quote:

Originally Posted by blcknspo0ln

I've never once seen a dsmlink car have to go positive with fuel.

+1

I'm off-the-gauge rich on my UEGO at 0%.

mnetwork · 06-23-2008, 12:13 PM

I just have the stock regulator, no gauge. The fuel was rich with everything 0'd out on the first tune. I'm probably gonna try to tun again tonight...

mnetwork · 06-24-2008, 03:49 AM

Totally going throug the car again.. tightned up all couplers again just to make sure, did multiple boost leak tests... Found a somewhat small, but audible boost leak at the first throttle body gasket, fixed it. Found a small exhaust leak at the external wastegate on manifold. Fixed. Found a very very small leak at the BOV that I'm going to fix. I should have everything solid and be tuning again Wed...

mnetwork · 06-25-2008, 08:32 PM

Ok.. fixed a nice leak at my upper I/C pipe to throttle body and a smaller leak at my bov. I fixed an exhaust leak at my wastegate and checked the rest of the exhaust for exhaust leaks....

Went for pulls... I left timing and fuel at zero. I did a pull, I got around 3 counts of knock starting at around 5k and going till around 6.5k. I added one click of fuel that range and pulled one degree of timing through the range. I did another pull and this time it was going fine and when I got around 4.5k it ran lean (around 13.3, both dsmlink and gauge showed it).. and then at 6.4k I peaked out at around 5.7 counts of knock. I thought I had the logs, but my friend wasn't pressing the right key

. I am out of ideas! What do I do?

blcknspo0ln · 06-25-2008, 09:41 PM

I'm at a loss, it seems that you're problem is a specific thing, so I can't offer specific advice. I think you need to start over from the basics and tune from there. Do all boost leak tests to 25-30 psi (don't cheat yourself), get a timing light and verify base timing, log o2 voltage during a run, rewire your fuel pump. then start all over with ltft/stft tuning.

mnetwork · 06-27-2008, 08:46 AM

I replaced my FPR with another stock FPR that I had laying around. I went out and did a few 3rd gear pulls. AFRs SEEMED to be staying in the 10's, although it could have just been a fluke... No knock above 3 counts (my CEL never came on, have it set for 3 counts). I'm going to try to do some more pulls tonight. I'll post my results...

mnetwork · 06-28-2008, 10:34 AM

Did some tuning last night. Left fuel at zero and worked on timing. Got timing up a bit. I'm really starting to think my wideband is way off. On a 5th gear pull, when I pull with boost part throttle (wastegate still closed) the wideband reads very rich, but then when I floor it and the wastegate opens it starts to read lean. I'm really starting to think the wastegate throws everything off.

jusmx141 · 06-28-2008, 12:15 PM

How far is the o2 sensor from the manifold? Do you have the bung welded at an angle as the instructions demonstrate?

I can't see how it would read lean after the gate opens. It's not like it's drawing fresh air IN through the wastegate, or the gate is totally diverting exhaust flow.

blcknspo0ln · 06-28-2008, 11:24 PM

Here's a quick way to test if your sensor is ok:

sit in the car and turn your key to ON, but don't fire up the car. watch the wideband, it should do a series of regular codes and then start rich in the afr's and then gradually (within 30 seconds-1 min) start getting leaner and leaner. It should go all the way lean until it reads - - - which is free air. lmk if it does that.

mnetwork · 06-29-2008, 11:26 AM

I will try that, I have my wideband installed in my secondary (after-cat) o2 sensor location... I will try that test, but I'm pretty sure my wideband does that, I'll check it out.

tbonitz301 · 06-29-2008, 11:35 AM

I figured i'd chime in and say that my wideband does exactly what tom described, but i am still suffering from irratic a/f ratio's just like the op. Sometimes i'll be at like 10%throttle, and the wideband pegs rich

Othertimes it's fine. I also did a pull the other day. I had my a/f ratio dialed in at11.1:1, and for some reason it went way lean. Like12-13:1. I dont get it.

mnetwork · 06-29-2008, 03:21 PM

Sounds like we're in the same boat.. very close setup too... Only thing is I'm externally gated..

blcknspo0ln · 06-29-2008, 03:26 PM

you guys should get some seafoam and see if you have exhaust leaks, that would say a lot.

btw, why didn't you go to the meet today mark?

mnetwork · 06-29-2008, 03:30 PM

George just told me about it on AIM and I saw the IM when I woke up... It was too late and then I wasn't sure what was gonna happen with the rain... I would have gone if I knew..

I have a new bottle of Seafoam laying around, I might try that... I checked for leaks couldn't find any. If there are I'll def see it with seafoam..

mnetwork · 07-04-2008, 08:23 AM

I checked the other day with Seafoam and found that my exhaust manifold has a small crack and it was leaking a lot at the gasket in between the manifold and turbo. Ordered up a new manifold already. But does anyone know how to get those thick SS gaskets to seal right? The old gasket I used to have sealed fine, but it was messed up when I took it off during the head gasket and now I have this thing, but it doesn't seal...