dsmlink v2 tuning questions

[drzdude]

Hello, I first off would like to say this is an awesome site. I am new to DSMs but I'm learning quick and diving in head first. I have a 91 tsi that has tons of goodies on it. I filled out the details on it in my profile. The current challenge I'm facing is with my v2 dsmlink I'm having trouble obtaining a solid idle. Its set at 1100rpms but it wavers a bit. I've got a new isc and have done a good leak check but its still not very solid. I'm beginning to think that maybe its the best it will be with the BC 280 cams. I cannot get the airflowperrev much lower than .40. I'd post a log file if I can figure out how to. thanks for any help.

 

[agentorange313]

on v2 can you see the idle switch count?

 

[gofer]

If he's using v2.5 (v2 app with v3 software) he can log IdleSw.

If you're trying to attach a log to the thread, which would be helpful, just read through our FAQ:Attaching Images.

 

[drzdude]

my switch is definately working it toggles from 0 to -1. Ill get a log up in a second.

 

[agentorange313]

sorry I mean ISC counts. I know if v3 you can watch the ISC counts and adjust the biss screw accordingly.

 

[drzdude]

log is up and It does have isc position mine seems to be around -34, thanks fellas

So does anyone else running 280 cams getting a smooth idle or are they mutualy exclusive?

Another thing is I'm running in openloop because I have no front O2 at all.

Another weird thing is that sometimes went driving around when I come to a stop the idle hangs high at around 1500-1600rpms for like 10 seconds then it drops to the set 1100rpms. From the datalogs I know the idle switch is activated when its doing it. Any ideas?

 

[drzdude]

anyone get a chance to look over the log?

 

[gofer]

You just answered your own question, not having a front o2 sensor signal is why your idle sucks. Only in v3 or v3lite can you use your WB sensor input to simulate the front o2 sensor function through link. The AEM UEGO has a feature to simulate this but you've got to turn the switch on the back of the gauge to P4.

You need to add CombinedFT and MAFRaw to your logs.

 

[drzdude]

The simulate function works on v2 I've tried it with link and switched the wb meter to p4 and it worked but the idle was way worse it would swing 1300 to 700 non stop. It still doesnt explain why I cant get the airflowperrev down more. I really wish someone with similar setup would chime in.

 

[gofer]

"Similar setup" has nothing to do with it, like I said, add those two things to your log and I'll be able to tell you more. If you have an inflated AirflowPerRev and a negative CombinedFT its a classic sign of a vacuum leak around the TB and IM. You aren't capturing CombinedFT though so who knows?

 

[drzdude]

Sorry combinedft and mafraw are not availible on v2. I would if I could.

 

[usmc0651dns]

^Agreed. You need to be able to see where your CombFT for a better understanding of why your AirFlowPerRev is so high. MAFRaw will also show you where to adjust your MAFComp sliders if necessary. Of course idle would be around the 50Hz slider. I have similar size cams and the car idles great ~950 RPMs. Could be a boost leak like gofer stated, but grab another log with CombFT and MAFRaw logged. Also a TPS Adjust may be helpful. My cable would stick every now and then due to 14 years of age I guess, and it sometimes would make the car idle funny. Another thing to look for is dialing in your injectors and adjusting your deadtime to the preferred setting for those injectors.

 

[drzdude]

^Agreed. You need to be able to see where your CombFT for a better understanding of why your AirFlowPerRev is so high. MAFRaw will also show you where to adjust your MAFComp sliders if necessary. Of course idle would be around the 50Hz slider. I have similar size cams and the car idles great ~950 RPMs. Could be a boost leak like gofer stated, but grab another log with CombFT and MAFRaw logged. Also a TPS Adjust may be helpful. My cable would stick every now and then due to 14 years of age I guess, and it sometimes would make the car idle funny. Another thing to look for is dialing in your injectors and adjusting your deadtime to the preferred setting for those injectors.

Gents V2 doenst have the ability to log those. Its not an option.

 

[usmc0651dns]

They are if you use the v3 software.

Here is some proof. Just make sure you set both to be captured and displayed. I am running v2 ECU and v3 laptop application.

And here is a screenshot in case you haven't set those to be displayed, as they wouldn't show up in my attachment then.

 

[gofer]

Gents V2 doenst have the ability to log those. Its not an option.

If you'd like I can post a v2.5 log with CombinedFT and MAFRaw being logged that way you believe me?

 

[drzdude]

Ohhh, ok I see I didnt realized you could add more value with the capture values function, I thought I was stuck with the ones that were in the display values list. Thats great news because the mafraw will greatly help in my tuning. Attached is the file with those values added, though the fuel trims are useless because im in openloop mode. thanks for your further help

 

[gofer]

Your in open loop because you've LOCKED it in open loop yourself, go to the Misc tab and disable it.

 

[drzdude]

I have it lock in openloop on purpose because I dont have a real front o2 sensor. If i use my wb sensor and simulate it to the front o2 the ecu starts looping from rich to lean and the idle really varies. I dont know if thats because its mounted so far down the exhaust (its even with the firewall) or if the simulate function is just not that accurate. I can go do that and log it if your interested. I have the car tuned fairly good in my mind in openloop. Attached is a log with some wot pulls.

One thing that I notice from looking at your idle log gofer is that your timing is dead set at 11 degrees where mines is all over the place, any ideas to why that is?