DSMLink Issues!!!

mnetwork · 06-11-2008, 10:32 PM

I am driving myself crazy trying to tune my car. A/F ratios are so random I can't control them. One click on the fuel slider and it will go from 10's to 12's. And then if I'm crusing and I hit the gas in 5th gear the car runs very lean even though it was just running in the 10s at that rpm range on my 3rd gear pull. When I got home I looked at injector duty and at some points it was in the 90's. I have 680's, how could this be. Also, last time I tried to tune I didn't even touch fuel and it stayed in the 10's the whole time. Today, I've been adding fuel just to keep it from running lean. Any ideas on this? I'm going crazy.

SOADweskey · 06-11-2008, 11:12 PM

You are probably going to hear it from more people than me but, when was the last time you did a boost leak test?

Inconsistent AFRs are a common sign of un-metered air entering the system or metered air leaving.

playitlouddsm · 06-11-2008, 11:45 PM

What are you basing your a/f readings on? The dsmlink estimate or an actual wideband?

nevermind i just noticed you have an aem wb.

mnetwork · 06-12-2008, 06:45 AM

I did one last week. I fixed a pretty good size leak right before the test too. I did a boost leak test right before I started tuning with DSMLink...

daren_p · 06-12-2008, 07:59 AM

Are you new to tuning with DSMLink? Have you made sure your fuel trims are where they should be before you started to try & tune your WOT sliders? If you have no boost leaks are you sure your MAF is functioning correctly?

mnetwork · 06-12-2008, 08:06 AM

Quote:

Originally Posted by daren_p

Are you new to tuning with DSMLink? Have you made sure your fuel trims are where they should be before you started to try & tune your WOT sliders? If you have no boost leaks are you sure your MAF is functioning correctly?

I am new, I've only had DSMLink for a week tomorrow. My fuel trims were fine with the global fuel adjustment and dead time it came with. I couldn't get it any better, both trims were within +/- 5. When I tried to adjust it, it just made the trims worse. I don't see how my MAF couldn't be. It is showing air flowing as the turbo spools up. It peaks out at around 36lb or so.

1992awdlaser · 06-12-2008, 08:16 AM

Based on the log in the other thread it appeared as there was a leak between the maf and turbo inlet or that the maf is hacked. Did you check for a leak in the intake pipe?

mnetwork · 06-12-2008, 08:21 AM

I thought I put the intake on fine, it seemed tight. I do not not have a hacked MAF. What did you see in my log that made you think that there was a leak?

1992awdlaser · 06-12-2008, 08:31 AM

Your boostest being lower than actual boost at 100%ve. If it was a gm maf or a hacked maf I would expect that though. But, it could be because your elevation in boostest props is not set up.

jusmx141 · 06-12-2008, 10:41 AM

Have you touched timing at all yet?

Sometimes if you're getting timing pull from random knock your a/f ratios will be rather inconsistent.

mnetwork · 06-12-2008, 10:45 AM

Boostest isn't accurate for me, even after putting in my altitude. I'm only at like 47ft or something like that.

I am not getting knock unless the car runs randomly lean, so no.

blcknspo0ln · 06-12-2008, 02:25 PM

Take a step back and start over. Make sure you have no boost leaks, a properly working MAF (no leaks there either) and a healthy car. Once you do that, get your fuel trims straightened out (I like tuning with the airflow sliders vs. tuning with global) and then after that go for a WOT pull. A handy-dandy writeup from some link members really sums it all up here:

DSMLink User Group Forums

mnetwork · 06-12-2008, 06:23 PM

I had a small leak in my intake pipe after the mas that I've had on and off for a while... Replaced my fuel filter (I personally never changed it before, it has been changed at some point though, i was a Fram), and I tightened up the intake very nice on the turbo. Going to do some pulls and see what the car does now....

mnetwork · 06-12-2008, 09:35 PM

I went through everything, cleaned out my MAS (even though it was working fine), fixed a small leak in my intake after the MAS, re did my tune from scratch, checked for any leaks, replaced my fuel filter.. same problem.

I got the fuel trims pretty rich but not too rich and they were safe, and two pulls later AFRs jumped to 13 at one point out of no where. I can't stabilize my AFRs no matter what. I am all out of ideas, I followed everything in the tuning guide.

1992awdlaser · 06-13-2008, 05:56 AM

Does it seem to do it around the same rpm? Or does it do it at random rpms?

blcknspo0ln · 06-13-2008, 06:45 AM

Did you post a log somewhere? post all of the logs you just did.

DoyoFCT · 06-13-2008, 06:50 AM

what type of wideband are you using? did you buy it new, how old is it?

mnetwork · 06-13-2008, 08:47 AM

It is and AEM Wideband, I bought it brand new. It is about a year and a half old.

mnetwork · 06-13-2008, 09:04 AM

Here are the logs. I can't find the last log, but in the last log A/F's randomly went really lean in the 4-5 range I think and hit 13 at one point and then I got a nice amount of knock...

csgsx23 · 06-13-2008, 09:47 AM

Were these logs back to back or did you give your car a cool down period in between pulls?