A few link questions

[blk_srt]

I'm going to be ordering dsm link next week probably and I have a few questions before I do so.
I'm I correct in thinking that when you send in your ecu they ask you what injectors you are running and they will put in a chip that defults to the settings for that particular size or injectors? And also when you hook up a laptop it asks you what size injectors and puts in a base tune for that size? And lastly can I tell them I'm running 450s and when I get it back just plug it(the ecu) in and go and everything will be ok or do I need to have a laptop before it will work right?

[kjewer1]

There are a whole slew of default values you need to supply them with. Injector size, CAS inversion or not, idle rpm and other rpms, etc. There is a list on the ordering page of thier site. All of these values can later be changed with the laptop, but these are the figures it will default to when the ECU loses power. It makes sense to at least have the global set right so you can drive the car to a laptop, if you don't have a dedicated laptop for the car. Running on 450 settings with 950 injectors for example will cause a lot of trouble, not the least of which is possible cylinder wall/piston ring damage due to bore wash. With all of the defaults set right, the ECU will run out of the box, no need to connect with the laptop. I always do as a general rule though, not worth taking a risk.

[crunchymilk55]

Yes, they will default the chip to the global and deadtime according to your injectors.

The laptop doesn't ask for your injector size. You can do some math with the injector size you have and get the global adjustment % they ask for, it's really easy, and defined in the user manual. Dead time adjustments are also easy, but require a laptop so you can read and adjust the values.

The problem with telling them you want it programmed for 450's is that once you get bigger injectors you will be able to easily adjust for the new injectors, but your default will be wrong. So if you're battery dies or your ECU loses power for whatever reason, the ecu will default back to 450s and you're new injectors will flow WAY too much, and cause problems. I would get them defaulted for whatever you plan on running, and then making the adjustment for your 450s once you can.

DSMLink doesn't NEED a laptop to run at first, but the tune will be very choppy, and like very unstable.

If you don't understand anything just lemme know.

[Talon69]

Yup they are correct, when i ordered my dsmlink i said what i wanted but when the order was sent and 1 day later i got a 1g head i needed to tell them to invert cas and they did for me WHEEEEEEW. They are awsome and answered all my questions for me when i had them call me. They would not give me there # which i understand why. Camellia is awsome from dsmlink!!!!

[kjewer1]

DSMlink customer support/service is in a class of it's own. Nothing else in the realm of DSM specific vendors can compare, IMO.

[blk_srt]

Well the thing is I want to run 1000cc injectors in the future but you know how it goes plans change and I might find a good deal on 950s or something and get those instead so I'm not positive what I'm going to end up running. Think I should wait untill I get the injectors or know forsure what I'll be running and do it all at once or link now?

[gthompson97]

You could get link now and just have them set the injectors for lets say a pair of like 660's or something. That way if you're running either the 450s or the 950s/1000s and you lose power, you'll at least be able to limp it around without causing a whole lot of damage, if any at all. Just a thought.

[blk_srt]

thats an idea. Now the question is will my mom let me borrow her laptop to set it. How hard is it to change injector sizing? I'm good with numbers but havent had much expernce tuning and with fuel trims and such

[kjewer1]

950s and 1000s are so similar I'm not sure I'd worry too much about it. Well, it's the difference between 75 and 79 lbs/min, but my point is there isn't much over the 75 lb x67 turbos until you get into the real big stuff, and neither injector will work.

You could adjust for injector size faster than the laptop will boot up. Old injector divided by new injector, minus one. Set that value for global, and go with the typical dead time value for the injectors you run. That will get you in the ballpark. Weeks or months could then be spent tuning in trims and fixing everything that is messing them up on you How much further you go is up to you.

One thing I think I would recomend for someone that doesn't plan to datalog often is setting the knock CEL to come on at something lower than the stock value of 5 degrees. 2 or 3. This way you know if you are getting any decent knock without having to log it.

[Thor06]

I have a question... what is dead time?

[gstclips]

ok so if you disconnect your baterry, it sets it back to that default? thats kinda shitty...I just got my eprom in the mail today. I will most likely always have my laptop in my car, because I dont use it for anything now anyways. can you save the information when you tune it and then you just have to reload it or what?

thats one downfall of link for sure, memoryloss

[crunchymilk55]

yes you can save the tune and just load it on the eprom in a few seconds. They are working on a memory unit for the 2gs

[kjewer1]

Originally Posted by Thor06

I have a question... what is dead time?

An injector coil takes a certain amount of time to actually open the injector after the ECU energizes it. Larger injectors tend to react slower. So we add more time to the "dead time" or saturation time as it's sometimes called, to compensate. It's called dead time because it's time the ECU "thinks" the injector is open, but it's not. So lets say the total open time commanded by the ECU is 500 milliseconds, and the dead time is 100 milliseconds. The injector is actually only open for 400. Also, battery voltage affects dead time, and the ECU compensates automatically.

This is a big part of how we can run huge injectors and still get stock like idle and good fuel trims on both cruise and idle