New to DSM's and New to tuning, need assistance!

[Matt94z]

Well, I tried posting in the tuning section, but im a noob so it wont let me. Here's my story, I got a sick deal on my buddies TSi. He built it 3 years ago, never drove it... ever and then lost interest. The engine has 0 miles on it! Heres the mods, it needs tuned badly, barely stays running.

-Stock rebuild on 6 bolt block
-rebuilt head with stainless valves and upgraded springs
-Webb cams.... not sure of which ones... 272 maybe? I think they are stage 2.
-Precision 780cc Injectors
-3"GM MAF with translator (all knobs zero'd out)
-Precision SC-61 snail, 3" open downpipe
-Turbonetics Deltagate, external dump
-Eprom ECU with DSMlink V2
-Walbro 255 in tank pump


Now I have never tuned a car in my life, so I dont really know what all that crap on DSMlink even means... The car is hard to start, then it runs very rich and rough. once it warms up, it starts easier and runs a bit smoother, but still very rich. I tried setting the injector globas setting to the reccommended -40% for 780's, but it would stall and revs really choppy. The TPS is set at +30% for whatever reason.... If anyone could please give me a base tune to start with, I would appreciate it. Also if you can think of anything else that might need adjusted to make it run smoother.

Thanks, Matt

 

[Voodoo262]

First and foremost, make sure the MAF Translator is configured correctly via the dip switches. I had a friend that programmed his with the wrong MAF size and he couldn't get his car to run right for the life of him.

 

[DSMTyson]

Well, I tried posting in the tuning section, but im a noob so it wont let me. Here's my story, I got a sick deal on my buddies TSi. He built it 3 years ago, never drove it... ever and then lost interest. The engine has 0 miles on it! Heres the mods, it needs tuned badly, barely stays running.

-Stock rebuild on 6 bolt block
-rebuilt head with stainless valves and upgraded springs
-Webb cams.... not sure of which ones... 248 maybe?
-Precision 780cc Injectors
-3"GM MAF with translator (all knobs zero'd out)
-Precision SC-61 snail, 3" open downpipe
-Turbonetics Deltagate, external dump
-Eprom ECU with DSMlink V2
-Walbro 255 in tank pump


Now I have never tuned a car in my life, so I dont really know what all that crap on DSMlink even means... The car is hard to start, then it runs very rich and rough. once it warms up, it starts easier and runs a bit smoother, but still very rich. I tried setting the injector globas setting to the reccommended -40% for 780's, but it would stall and revs really choppy. The TPS is set at +30% for whatever reason.... If anyone could please give me a base tune to start with, I would appreciate it. Also if you can think of anything else that might need adjusted to make it run smoother.

Thanks, Matt

If you post a log, someone could probably help you out. We cant see what your car is doing, so we really cant help you as much as we would be able to if you posted a log.

And did you mean the TPS adjustment is set at 30%? or the throttle posistion is always at 30%.

Go to ecmtuning.com and sign up at the forums. There is a specific section for V1/V2 users. You should be able to get help there as well.

 

[doubleclutch99]

check this site out it'll tell you where to set your base settings on the maf translator. MAFT Version 2.0+ Tuning Guide - Full Throttle Speed Tech Support

 

[Matt94z]

Ok, I'll try to figure out how to post a log. The TPS is set at +30% in DSMlink, otherwise it wont stay running.

Thanks for the replies!

 

[92AWDHX40]

Base tune everything to zero is how i started every car is different, mine ran fine like that for while unitl i go into tuning.

 

[Matt94z]

Ok, is there something special that needs done to make a 6 bolt motor work in a 2G?

I opened up the MAF translator today and checked the settings with the instruction manual. It was set differently than the manual calls for (2G with 780cc injectors). I set it correctly and the car wouldnt start. It just kept cranking, then I reset the ecu and tried again, it started for a second, then stalled and wouldnt restart. Sometimes when cranking it would try to start, but didnt. And then the battery died.... its like 20degrees here, so I gave up for today.

Im going to recharge the batt and then put the settings back to the way it was when I got it. Atleast it ran then, just super rich and choppy. Im just hoping theres no other issues other than the tune.

Is there any way to eliminate that MAF? I would like to make it as simple as possible to tune.

Thanks, Matt

 

[doubleclutch99]

If you fill out your profile we should be able to help you out .

 

[Matt94z]

If you fill out your profile we should be able to help you out .

Fill out my profile? What linke my name? How will that help?

 

[speedy13]

he means the profile as in, mods and such, wich you already stated, but not in your profile. also don't forget to go to vfaq.com to get you more familiar with dsms. A log will definatly help people help you. also , what fuel pressure are you running ? The more presice info you provide, the more it'll help. Another thing is to make sure your GM IAT(intake air temp. sensor) is reading right on your dsm link, or else the maft is staticly stuck at 80 deegrees all the time. just some things to look at. good luck with your new ride,keep us posted.

 

[Colt4G63 also]

To run a six bolt in a 2g you may need to re-sequence the fuel injectors at the ECU plug, and reverse the wires that trigger the coils. Depending what parts you are using you may have things firing out of phase. RRE has a bunch of good instructions for wiring your swap.

RRE Instructions

 

[Matt94z]

Ahhhh... ok, yea that could be an issue, cause my buddy is a bit lazy.

As for the fuel pressure, I was wondering that myself, so I looked at the rail and it has a stock regulator. The vac line goes into a solenoid and then into the manifold. I thought that you had to lower the fuel pressure when you go up in injector size?

And Im not sure where he put the GM IAT, if he even did! I noticed that when the car was running the other day the Air Temps were around 76-78 I think? and it was about 20 degrees out. Also I think the MAF was reading aroung 2 grams at idle? Also, should the IAT be before the turbo or in the charge pipes?

I'm going to have to put all the settings back to where he had them in the DSMlink and MAFT, then charge the battery and attemp to get a log posted. I wouldnt be suprised if there was an issue with the wiring as well.

Thanks for all your help guys!

 

[Matt94z]

Anyone?

 

[doubleclutch99]

Set the maft as if you are running 450's ,by following the guide i posted above. then set link up for the injector global and deadtime settings for the 780's. what you have going on is your compensating the injectors with the maft and then again with link . so basically you are double compensating. its no wonder it won't run right. you're probably going to run into problems with a stock fuel pres regulator being over run by the 255. fuel pres doesnt go down with bigger injectors. fuel pres is maintained at a set pres by the regulator until you come out of vacuum and in to boost when the pressure goes up . one pound of boost equals one pound of fuel pres. and so on. hope this helps

 

[Matt94z]

Ok, I set the MAF for 450's. I was just trying to get this terd to run again a few mins ago and got a few more logs. I cant seem to get it to idle for shit. Sometimes it will idle for a little bit, then it just stalls. I had to keep my foot on the pedal most of the logs. Another thing i noticed is that my TPS may need manually adjusted, once I set the DSMlink compensation to make it correct, at WOT its not 100%.

Also when I try to set the DSMlink for 780's, it runs terrible. I tried messing with the fuel and MAF adjustments, but I have no clue WTF Im doing. haha

 

[nightmares GS-T]

Ok, I set the MAF for 450's. I was just trying to get this terd to run again a few mins ago and got a few more logs. I cant seem to get it to idle for shit. Sometimes it will idle for a little bit, then it just stalls. I had to keep my foot on the pedal most of the logs. Another thing i noticed is that my TPS may need manually adjusted, once I set the DSMlink compensation to make it correct, at WOT its not 100%.

Also when I try to set the DSMlink for 780's, it runs terrible. I tried messing with the fuel and MAF adjustments, but I have no clue WTF Im doing. haha

Alright first and foremost you need to make sure all the maps are set to stock since there is no telling what your friend attempted to adjust. Do this by going to ecu config and going through all your maf maps and timing maps and right clicking them and set them to stock. Then make sure you have your injector brand and size set correctly. They may be 780 cc injectors but they don't flow that much actual flow will vary so check ecm links site for the chart that will show actual flow. Set it to what the chart says as well as global and deadtime. Double check your maft to ensure all settings and dip switches are set correctly and set for 450 cc injectors so its only simulating the stock maf in place of the gm. Dsm link will tune the rest. As for your tps adjustment again look on links help page ecmwiki or something like that and use the auto tps adjustment tool. The car doesn't even have to be running to set it. After you have went through all of this and double checked everything try to crank it and get back with us. Be sure to log it.

 

[Matt94z]

Alright first and foremost you need to make sure all the maps are set to stock since there is no telling what your friend attempted to adjust. Do this by going to ecu config and going through all your maf maps and timing maps and right clicking them and set them to stock. Then make sure you have your injector brand and size set correctly. They may be 780 cc injectors but they don't flow that much actual flow will vary so check ecm links site for the chart that will show actual flow. Set it to what the chart says as well as global and deadtime. Double check your maft to ensure all settings and dip switches are set correctly and set for 450 cc injectors so its only simulating the stock maf in place of the gm. Dsm link will tune the rest. As for your tps adjustment again look on links help page ecmwiki or something like that and use the auto tps adjustment tool. The car doesn't even have to be running to set it. After you have went through all of this and double checked everything try to crank it and get back with us. Be sure to log it.

Ok, I will try to zero everything out. Keep in mind I have V2, so it doesnt have all the fancy stuff like V3. There is a TPS adjustment tool, but not the same. I will try and get back to you guys.... thanks!

 

[JasonStern]

I noticed:

-Walbro 255 in tank pump

...and:

I looked at the rail and it has a stock regulator.

you might want to upgrade the fuel pressure regulator as the walbro 255 will overrun the stock fuel pressure regulator.

and definitely zero the MAF-T out... your tuning should be done in DSMLink and not through other devices trying to trick DSMLink.

 

[Matt94z]

I noticed:



...and:



you might want to upgrade the fuel pressure regulator as the walbro 255 will overrun the stock fuel pressure regulator.

and definitely zero the MAF-T out... your tuning should be done in DSMLink and not through other devices trying to trick DSMLink.

Everything is zero'd out, and I have an Aeromotive AFPR on the way. I downloaded the V3 software, but cant get it to conntct with the ECU, I can get the 2.5 to work fine, but not the 3.... any ideas?

 

[doubleclutch99]

If you zero out the maft all of your injector settings will be off in link. if you set the maft up to read like the stock 450's then all of the deadtime and global settings should reflect what your injectors actually are in link. otherwise you'll have to do some math to figure out what zero is on the maft and add in the injector size. just a thought . btw i sent you a pm.

 

[Matt94z]

If you zero out the maft all of your injector settings will be off in link. if you set the maft up to read like the stock 450's then all of the deadtime and global settings should reflect what your injectors actually are in link. otherwise you'll have to do some math to figure out what zero is on the maft and add in the injector size. just a thought . btw i sent you a pm.

... I meant Its set up for 450's.