dsmlink or just me

[4g63tsiawd]

Ok, I've only tuned with a safc2, it was pretty easy. Now I'm in a different league. I can't seem to get my idle up to 14.7, it wants to stay down around 12.5 to 13.2. I got my fpr set at 43 with vacum unhooked. I have my maft set at 40% base. No matter where I put the fuel settings on the link it doesn't change. I had it at 14.7 steady, but as soon as I reved the car alittle it went right back to hoovering around 13ish. Also if I'm crusing and give it alittle gas(1/4 throttle) it bucks a few times, and the bov relieve pressure, kinda like fuel cut. So where do I start with this thing.

This is a thread I started at buschurracings thread, but didn't get very far. So any help would be appreaciated.

 

[4g63tsiawd]

Is a n/t throttle body, direct plug and play, with the 1g's. I noticed at 1/4 throttle it builds boost fine. Bus as soon as I hit 1/2 throttle, I loose boost, bov goes off and the car stumbles. My wideband was reading 10.6ish, so I know I need to lean it out some.


Well the car doesnt sputter or run rough. The O2 sensor takes a measurement of air/fuel ratio, correct. Until part throttle and it goes into loop mode right? My cars a/f ratio stays steady when I'm going part throttle. Its just cruize and idle its getting wacky. Could the O2 sensor be going bad.


These are some of the post I replied to @ buschur

 

[DGajre777]

I got my fpr set at 43 with vacum unhooked.

Why are you running at 43psi of fuel pressure? The base fuel pressure for a 1G with the vacuum hose disconnected is 37 PSI, 43 PSI is for the 2Gs.

 

[4g63tsiawd]

I'm not anymore, thats just what it was set at when I had the 450's in there.

 

[steve]

Why are you running at 43psi of fuel pressure? The base fuel pressure for a 1G with the vacuum hose disconnected is 37 PSI, 43 PSI is for the 2Gs.

There is nothing sacred about the 1G base fuel pressure once you know what your doing.

We recommend to people that they run the stock base setting to simplify the correction for injector size changes but the formula for computing the effective size due to pressure is in the archive and on RC's site.

Since the injectors are typically rated at 3 bar (43.5 psi) you just have to remember to reduce the size of the 450s first to their true value before calculating the correction factor for the new ones.

The other thing to keep in mind is that you don't wind up with a actual fuel pressure that exceeds the relief valve in the fuel pump at your max boost pressure. Don't forget to include pressure drops in the filter and lines that cause the pressure to be higher at the pump than the rail.

Now back on topic.

Closed loop happens at idle and cruise. That's where the O2 sensor provides feedback and the AFR bounces back and forth around 14,7:1 If yours isn't cycling then you not in closed loop. If it's cycling but doesn't show as around 14.7:1 then your measurment method is incorrect, your O2 is foobar, or you have a exhaust leak.

Your BOV shouldn't open unless your under vacuum. A stock 1G BOV needs almost 16 inhg to open. It shouldn't do so at part throttle.

Steve

 

[zippyshoe]

Yeah, in reality the factory 450cc/min injectors (which are flow-rated at 43.5psi) installed on a 1G using factory fuel pressure are actually only flowing at:

450cc/min*Sqrt(37/43.5) = 415.02cc/min

The ECU accounts for this when it determines fuel delivery. On a 1G, if you increase your base fuel pressure to 43.5 psi, then the factory injectors will actually be flowing at 450cc/min. However, you should have a tuning tool available to compensate for this increase in effective injector size above factory.

 

[4g63tsiawd]

Steve my man thank god you showed up. Heres what I'm working with. Over the last 1.5 years, I've done eagle/wiseco, fp2x cams,double valve springs,and 1mm oversized valves. This was out of a 1990 tsi. I picked up a body and its a 91 tsi. I completly removed all the wiring from the 1990 but it was never in that good of shape. Installed it into the 91 chassis. I'm having some wierd issues going on. On the dsmlink the a/f ratio is reading 18.1 at idle, but my w/b is reading around 14.2 to 15.2 it moves up and down. I also have the w/b wired into the ecu so the stocker isn't being used. However the dsmlink shows my narrow band still bouncing around from 90 all the way down to .04, and the whole time the a/f ratio is at 18.1 Now when I'm driving and do a 1/4 throttle pull and the boost kicks in my w/b reads 11.2 and the dsmlink is still showing a a/f ratio of 18.1 until I let off the throttle then its goes down, it should be the opposite. Another thing that might be right not sure or not, but I did a continuity test from the plug which i thought was for the break resivor reads back to pin 13 on the ecu. I'm sure you know what it is but its for the fuel voltage. Now when I try to do a pull anything above 40% throttle it breaks up bad. My timming goes all the way down to -10. My global is set at 59 and my dead time is set at 330. I have fic 950cc. This is just a start so if you need anymore information I can email you a pdf of my loggs. Sorry so long and thanks for any help. Oh and I have a n/t throttle body.

 

[2gGSX]

Steve my man thank god you showed up. Heres what I'm working with. Over the last 1.5 years, I've done eagle/wiseco, fp2x cams,double valve springs,and 1mm oversized valves. This was out of a 1990 tsi. I picked up a body and its a 91 tsi. I completly removed all the wiring from the 1990 but it was never in that good of shape. Installed it into the 91 chassis. I'm having some wierd issues going on. On the dsmlink the a/f ratio is reading 18.1 at idle,

The "A/F Ratio" output is just an estimate. I never look at it unless I'm diagnosing a metering or fuel delivery problem, but never for tuning purposes.

but my w/b is reading around 14.2 to 15.2 it moves up and down.

That is fine then.

I also have the w/b wired into the ecu so the stocker isn't being used. However the dsmlink shows my narrow band still bouncing around from 90 all the way down to .04, and the whole time the a/f ratio is at 18.1

Unless you your wideband has a narrowband emulator output and you wired that into the ECU, your ECU will still be using the front O2 sensor, and thus the variation of "Front O2" from .90 to .04 is expected.

Now when I'm driving and do a 1/4 throttle pull and the boost kicks in my w/b reads 11.2 and the dsmlink is still showing a a/f ratio of 18.1

Have you set the properties for "A/F Ratio"? Right click it and enter your correct data.

until I let off the throttle then its goes down, it should be the opposite. Another thing that might be right not sure or not, but I did a continuity test from the plug which i thought was for the break resivor reads back to pin 13 on the ecu. I'm sure you know what it is but its for the fuel voltage. Now when I try to do a pull anything above 40% throttle it breaks up bad. My timming goes all the way down to -10. My global is set at 59 and my dead time is set at 330. I have fic 950cc.

The DSMLink manual recommends -53% and a deadtime of 315 for FIC950's.

This is just a start so if you need anymore information I can email you a pdf of my loggs. Sorry so long and thanks for any help. Oh and I have a n/t throttle body.

You should search for your answers on the DSMLink board and ask your questions there. I've been told there has been an outbreak of pirated DSMLink units, and so that's as much help as I can offer.

 

[4g63tsiawd]

You should search for your answers on the DSMLink board and ask your questions there. I've been told there has been an outbreak of pirated DSMLink units, and so that's as much help as I can offer.

Well thanks for the input daddy. But I'm not having dsmlink issues I'm having car issues, maybe wiring or something else.

 

[2gGSX]

Did you read anything I just wrote? None of those "issues" you stated have anything to do with wiring or any other "car issues". It sounds like you never input the A/F Ratio properties and somehow think that your wideband is magically displayed under A/F Ratio, which again, is only an estimate.

 

[steve]

Yeah, in reality the factory 450cc/min injectors (which are flow-rated at 43.5psi) installed on a 1G using factory fuel pressure are actually only flowing at:

450cc/min*Sqrt(37/43.5) = 415.02cc/min

The ECU accounts for this when it determines fuel delivery.

I always use 411cc since the nominal 1G base according the the FSM is 36.3 psi. 450*Sqrt(36.3/43.5) = 411.07

I wouldn't say the ECU accounts this as much as I would say that the value of the fuel global global used represents 411cc injectors rather than 450cc by using a global fuel value of 0x4a rather than 0x44.

The AF estimate in DSM link needs to be told about the effective size since it thinks in terms of 2G base fuel pressures. This is part of what 2Ggsx is talking about and he given you good feedback on your questions.

If he hadn't, I honestly wouldn't have read that unformatted paragraph to figure out what you were saying.

Based on what I see right now I'd say your having operator errors foremost. Your Wideband data looks realistic, where is it located and what input to the ECU are you using?

Pin 13 is a simple sense circuit to make sure that the fuel pump is getting power when the ECU has turned on that side of the MPI relay.

Steve

 

[oldman]

Well thanks for the input daddy. But I'm not having dsmlink issues I'm having car issues, maybe wiring or something else.

2gGSX was correct in his answers. What is your account name on DSMLink? Please send me a pm on DSMLink to verified that in fact you have a legit copy.

 

[4g63tsiawd]

Did you read anything I just wrote? None of those "issues" you stated have anything to do with wiring or any other "car issues". It sounds like you never input the A/F Ratio properties and somehow think that your wideband is magically displayed under A/F Ratio, which again, is only an estimate.

Huh didn't even see your red writting up there.

 

[4g63tsiawd]

Oh and the w/b has a narrow band out put signal on it. And it has one for w/b signal also which is wired into the ecu's pin for the egr valve.

 

[ChltDSM]

"I have my maft set at 40% base"

In Conjunction with DSM link? I think thats why your not idling @ the correct AFR. I would zero out the MAFT, Set it up for stock injectors. Do all your injector scaling in DSM link. Not to mention the need for a MAP so you can calibrate link with the MAFT.

 

[oldman]

Oh and the w/b has a narrow band out put signal on it. And it has one for w/b signal also which is wired into the ecu's pin for the egr valve.

Is there a reason why you're not responding to my questions?

 

[scottsee]

1g Dsmlink as far as I am aware are not piratable. It's more of a 2g problem.

"I have my maft set at 40% base"

In Conjunction with DSM link? I think thats why your not idling @ the correct AFR. I would zero out the MAFT, Set it up for stock injectors. Do all your injector scaling in DSM link. Not to mention the need for a MAP so you can calibrate link with the MAFT.

You need zero your maft out and do fuel settings strictally with Dsmlink. If I'm reading correctly you eliminated your Front 02 sensor and replaced it with your wideband? If thats true I would highly recomend putting your front 02 back in using one of the 1g's 5volt inputs as your wideband input. It will make this specific fuel delivery issue much easyer to troubleshoot. The reason your A/F is off is most likely becasue your properties diag box isn't set to your correct injector size.

How are your STFT/LTFT above 190deg?

 

[steve]

1g Dsmlink as far as I am aware are not piratable.

It's just far more difficult than the 2G but it's possible. It's not clear if it's cheaper than buying one which is key.

 

[scottsee]

So, we're back to this don't help out DSMlink users agin hu... Perfect...

 

[oldman]

So, we're back to this don't help out DSMlink users agin hu... Perfect...

No Scott, don't blow this out of proportion. Just as what Chris and Thomas had agreed upon on the DSMLink forum thread, as long as users can verified that in fact they have a legit copy, we have no problems what so ever supporting them on Tuners, that is why I've asked OP to send me a pm on the Link forum.

 

[4g63tsiawd]

No oldman I'm not ignoring your question. I bought the link from a friend who blew his dsm up and is now out of dsm's, which he bought it from someone on this site and I'm waiting to transfer ownership. But as soon as I get my account with dsmlink, I will surely let you know.

Oh and the friend that bought the link is 92eagletsi, and the member of this forum he bought it from, on this forum get the hint this forum was suppose to send the manual and transfer users name. And when 92eagletsi wrote on this forum and complained about not getting the manual and username, you guys deleted his thread.

 

[4g63tsiawd]

1g Dsmlink as far as I am aware are not piratable. It's more of a 2g problem.



You need zero your maft out and do fuel settings strictally with Dsmlink. If I'm reading correctly you eliminated your Front 02 sensor and replaced it with your wideband? If thats true I would highly recomend putting your front 02 back in using one of the 1g's 5volt inputs as your wideband input. It will make this specific fuel delivery issue much easyer to troubleshoot. The reason your A/F is off is most likely becasue your properties diag box isn't set to your correct injector size.

How are your STFT/LTFT above 190deg?

Maft is zero'ed out. I will switch back to the stock O2 tonight. My injectors are fic 950's and my deadtime is at 315 and global is at 53% is this what you are refering to.

 

[2gGSX]

We are saying, in the actual DSMLink program, right click the box next to "A/F Ratio" and click "Props" then fill those out.

 

[4g63tsiawd]

We are saying, in the actual DSMLink program, right click the box next to "A/F Ratio" and click "Props" then fill those out.

Do you think this maybe my problem with cutting out at half throttle?

 

[steve]

Do you think this maybe my problem with cutting out at half throttle?

No it has nothing to do with anything but why the AF estimates don't work.