Sensors needed for DSM Link

[JSpot]

I recently bought a basket case 1G. I am currently in the process of getting the trans rebuilt andso this has given me time to go through the car with fine tooth comb. But I have two questions.

#1 What sensors/sending units are needed to run DSMlink. Or a better question is what can be eliminated as far as wires and sensors. I am going for strip only car, so daily driving is not an issue. I have already removes all emission/Evap/EGR goodies.

#2 With a blowthrough setup can the screen on the GM-MAS be removed or will that flub the readings of the sensor. It just seems that it would slow the airflow????


Any and all help is appriciated

 

[1992awdlaser]

#1- I have ALL of my emission equipment off the car with dsmlink. Not a single problem with it. The only vaccum lines I have are for things I need(wastegate, boost gauge, map sensor, fpr). You don't need a map sensor like I have. BUT, it will make tuning the car so much easier and quicker. The sensor that I still have off the top of my head are: cam, maf, tps, coolant, o2, probably a couple more that I can't think of right now.

#2- Mine has been removed since day 1. i don't have any problems with the readings with it like this. I also know two other local people and many others on line that don't have their screen any more. I have seen/ heard of a couple screens coming loose and pieces going into the engine somehow also.


Any other questions I might be able to help with?

 

[snowborder714]

1. I have the same setup as Pat - no emissions, minimal vacuum lines. I have an MAP and IAT sensor logged in DSMlink.

Here's a list of sensors my brother is getting rid of while doing his fusebox relocation. You may not have some of these since you have a 1g.

The following connectors and their wiring will be eliminated:
1. Manifold Differential Pressure (MDP) sensor
11. Auto-Cruise Control Vacuum Pump (Cruise Control Actuator)
13. Fuel Pressure Solenoid (FPS) Valve
14. Exhaust Gas Recirculation (EGR) Control Solenoid
16. Brake Fluid Level Switch
18. Hood Switch
19. Dual Pressure Switch (AC)
20. Capacitor (Noise Condenser)
27. Evaporative Purge Solenoid
28. Theft Alarm Horn (Anthony knows!)
30. Turbocharger Waste Gate Solenoid Valve [Boost Control Solenoid (BCS)]
35. EVAP Emission Purge Control Solenoid Valve
36. Air Conditioning (A/C) Compressor
43. Left Fog Light
44. Right Fog Light
Fuel Pump Check Connector
Rear o2 sensor

(Numbers in front relate to this tech article.)

And once V3 comes out, you can get rid of front o2 sensor and have it simulated based off your wideband. You will also be able to get rid of MAF sensor if you go with a speed density setup.

2. There has been much controversy over this and many threads on here arguing one way or the other. I've read a good bit of people (such as Pat) who have no problem with the screen removed. I still have mine in and have no problem. From what I understand, the screen is meant to "break up" and direct the airflow evenly.

 

[1992awdlaser]

2. There has been much controversy over this and many threads on here arguing one way or the other. I've read a good bit of people (such as Pat) who have no problem with the screen removed. I still have mine in and have no problem. From what I understand, the screen is meant to "break up" and direct the airflow evenly.

You are correct about the purpose Brian. The problem is, the gm mafs were not meant for a blow through setup. Because of this, even with the screen in, can mess up the maf reading slightly or ake it slightly erratic. Taking the screen out in a blow through setup shouldn't make these readings go off any further. The people that say they have problems probably just have a maf that is thrown off more than others or they are used to tuning the stock maf and didn't know what they were getting into.


As you know Brian, V3 has something built in to take care of this problem.

 

[JSpot]

How would I integrate a map sensor in a 90. Wouldn't that eliminate my need for the blow thru gmmaf. Also can the factory guage sending units/wiring be removed if I want to run autometer guages. Or they also input to the ecu

 

[snowborder714]

A MAP sensor reads boost/vacuum. So it's basically a digital boost gauge that can be logged.

However, 1g's only have 1 available ECU input, so you would have to choose what you want to use it for. If you got a MAF-T setup, that gives you an additional 2 inputs.

 

[JSpot]

A MAP sensor reads boost/vacuum. So it's basically a digital boost gauge that can be logged.

However, 1g's only have 1 available ECU input, so you would have to choose what you want to use it for. If you got a MAF-T setup, that gives you an additional 2 inputs.

So using a MAP wouldnt replace a GM-MAF, as a GM-MAF replaces the 1G honeycomb before the turbo???

Sorry if im repeting myself im new to this DSM thing

Thanks again

 

[Gstclipse69]

No a map sensor will not replace the need for a gm maf. Like stated above a map sensor works in regards to boost/vacuum. The gm maf is a device used for metering air. The gm maf will replace the stock 1g or 2g maf (honeycombs)

 

[Calan]

So using a MAP wouldnt replace a GM-MAF, as a GM-MAF replaces the 1G honeycomb before the turbo???

Correct. In DSMLink, the MAP sensor is used as an aid in tuning and can also be used to control the airflow inputs to the ECU once the MAF is overrun. (You basically tell DSMLink to stop using the MAF and start using the MAP sensor and/or a VE table at a specific amount of airflow)

EDIT: Oops...typing at the same time

And once V3 comes out, you can get rid of front o2 sensor and have it simulated based off your wideband.

Not to nitpick, but technically you can do this independently of DSMLink with some widebands. (Zietronix has a simulated NB output for example). Of course it still requires an input at the ECU, so it's not all that useful other than eliminating the front O2 sensor

BTW - My GM MAF screen has been removed for 2 years with no issues, although if I had to do it over again I think I would leave it. I don't have anything to compare it to before, but my hunch is that the readings wouldn't be as choppy with it in there. And I don't think airflow restriction would be a problem unless you were really pushing a lot of air.

 

[snowborder714]

The only time a MAP sensor will eliminate a GM MAF is when you go full speed density. This also requires an IAT sensor to be installed.

If you're not running a speed density setup, you either need a GM MAF, or a 1g/2g/Evo MAS.

Not to nitpick, but technically you can do this independently of DSMLink with some widebands. (Zietronix has a simulated NB output for example). Of course it still requires an input at the ECU, so it's not all that useful other than eliminating the front O2 sensor

True, true. My Innovate wideband also has a separate wire for a narrowband simulation. But right now I would not be able to do that easily, since I have all of my inputs used. My Baro input is still available, but it requires a resistor to make it work correctly. With V3, you'll only need the wideband input for both.