speed density setup

[justin90gsx]

i will be going to speed density soon and i want to see how your guys map and iat sensors are mounted, i want mine to look clean.
i was planning on getting a magnus street smim and was wondering how to mount it? maybe get the 2g/evo map sensor mount and try to find an adapter for that?
can i get some help and ideas? thanks!

 

[Ceddy]

Thanks for the clarification. I figured there wasn't much of any real world difference as many DSMers (myself included) have been running the AEM 5-bar sensor for a long time without any issues.

So, specifically what are the drawbacks of decreased resolution?

Also, what are the potential issues one could run into when switching to a 4-volt 5-bar sensor?

The Motorola ecus have a 8-bit 5 volt ADC. (0-255)
The AEM's 4v range will use only 80% of the ADC's resolution. (255 x .80 = 204)
A AEM 5-BAR sensor gives a resolution of 40 divisions per BAR. (204 / 5 = 40.8)

A 3-BAR Non-AEM sensor will give 85 divisions per BAR. (255 / 3 = 85)
More then twice the resolution of the AEM 5-BAR.


More resolution gives smoother operation, easier to tune, the signal is less blocky. The MAP sensor completely replaces the MAF in SD. You no longer have the thousands of Hz resolution the MAF offers, so its best to try to maximize your MAPs resolution.

Ideally you should run the smallest MAP that your boost level allows.
2 BAR = 14.5 psi max
3 BAR = 29
4 BAR = 43.5
5 BAR = 58


You probably won't have any adverse effects from your AEM 5-BAR, there are guys running 7-BAR sensors with no problems. But you never know if you could squeeze another degree of timing in with a better airflow signal.

 

[99gst_racer]

Thanks for the detailed explanation, Ceddy.

 

[imagine-02]

Just to be clear. Is this basically what you need to run SD with ECMLink?

ECMLink V3
http://www.ecmtuning.com/product_info.php?cPath=25&products_id=36&osCsid=oontndj0rt866rk298sasirqr7
or upgrade from V1/V2
http://www.ecmtuning.com/product_info.php?cPath=25&products_id=37&osCsid=oontndj0rt866rk298sasirqr7

SD Cable (not needed? but makes wiring easier)
http://www.ecmtuning.com/product_info.php?cPath=26&products_id=52&osCsid=fhcgar68d5ejjqn82lvgbtfrd1

SD Bundle (4BAR MAP, GM IAT, pigtails, and bung)
http://www.ecmtuning.com/product_info.php?cPath=28&products_id=50&osCsid=fhcgar68d5ejjqn82lvgbtfrd1

I know you can use other sensors, but this bundle makes finding the right parts easier and I wanted the 4BAR MAP anyway since I plan on having my boost around 35psi.

 

[Archer Fabrications]

where does the GM IAT wire up to? i have the sensor and pig tail mounted in my long throttle body elbow right after the BOV and im trying to go SD as well. where do i solder these wires to to get them working & with the ECU

 

[little-razcal]

If hardwiring, One goes into the intake temp pin and the other to ECU ground. You can wire either one anyway, meaning there is no way to get it wrong as long as your on the correct input.

 

[Archer Fabrications]

If hardwiring, One goes into the intake temp pin and the other to ECU ground. You can wire either one anyway, meaning there is no way to get it wrong as long as your on the correct input.

intake temp pin on the MAF connector? im lost as to where the pig tail even connects to at all.

 

[9!'clipseDOHC]

intake temp pin on the MAF connector? im lost as to where the pig tail even connects to at all.

Yes. You have to hardwire it, it isn't going to plug into anything.

You must connect your IAT sensor to the ECU's IAT input. This is the only input that's compatible with the speed density logic inside the ECU. You'll want to use pin 72 (red w/blue stripe) on a 2G ECU harness or pin 8 (green w/orange stripe) on a 1G ECU harness.

The IAT sensor has two wires coming out of it. Either wire can be connected to the ECU's IAT input.

The other wire should be connected to the ECU's sensor ground. That would be pin 92 (black) on a 2G ECU harness or pin 24 (green w/black stripe) on a 1G ECU harness

Both of these wires can also be pulled from the MAF connector under the hood. The wire colors are the same on the MAF connector as on the ECU harness. <- From ECMtuning.com

 

[90projecttalon]

Im also going to be running speed density on my 1g. I have my IAT bung right ofter my BOV but before the Throttle body. planed on running the gm 3bar map mounted to the fire wall and having the Speed density cable to the stock 1g conector makes everything so easy, so when you get the dsmlink V3 i just need it for the stock 1g maff due to the cable has everything wired up threw the stock wiring harrness.

 

[1990TSIAWDTALON]

Although I have the bundle, the GM map can be found on 3rd gen Camaros, which I also have several of. We don't use the computer on those cars so I have one off of one of my son's cars. It is a 1986 Z-28 and it is mounted on the firewall with a nice little bracket too!!! I have it as a spare but will probably use the mounting bracket on my new unit. Just for info.