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!

 

[Gamble97]

Put it on your uicp, not on your smim. Some people like it close to the tb and some like it close to the fmic. Mine is right on the uicp closest to the fmic.

 

[the_mork]

The cleanest way to mount the MAP sensor on an IM without a MAP provision is to use a GM MAP sensor and mount it to the firewall then just run a vacuum line to it which is what I do with my evo3 IM.

As for the IAT sensor you can mount it in your TB elbow or your UICP. I wouldn't add one to an IM just because I think that it is a lot of work and somewhat ugly for basically no gain over other mounting options.

 

[Boostdclips99]

I see a lot of people running there IAT close to their BOV. Not quite sure why, but I am going to mount mine on the uicp. I would think you need it as close to the Map senor and head as possible to get an accurate reading.

Im going to be running a GM map, probably mounted to the firewall.

Question. How many people are still running a MAS with their speed density setups?

 

[the_mork]

The actual mounting point of the IAT sensor isn't really terribly important as long as it is post-intercooler and IMO some distance away from the bov unless the bov is closed at idle.

Where you mount your IAT sensor may affect your tune some but is something that you compensate for. As it is though I've spent some time running without an IAT sensor (bad pigtail) and despite a tendency to bog and some topend loss it actually ran okay.

 

[->PrOjEcTGS<-]

Here's where I mounted my stuff on my 1g:

IAT in lower part of UICP. After FMIC but before any meth nozzles.

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GM 3 bar MAP sensor mounted to firewall

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Tapped intake manifold for a dedicated boost source for MAP sensor

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[Mike1992]

IAT in the uicp and map off the manifold

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[Rockbmx1]

If I remember correctly, AEM says that the optimal placement of the IAT is after the bov and no closer then 6" to the TB. I would think that is pretty much what a few people have basically said in this thread already.

 

[justin90gsx]

awesome! thanks for the pics guys!
so what would be the best sensors for me to run @ 600hp
AEM or the GM ones? i was thinking AEM.
and what vehicles does the sensors come off of? say i wanna got to a junk yard and find them on a vehicle.
thanks!
i dont feel good today

 

[1991GSXAWD]

Some vehicles have the IAT mounted on the manifold others before the TB, just make sure that the MAP sensor is mounted higher up to prevent condensation in vaccum lines reaching the MAP and cause running issues, not that it's a common problem but it does come up once in a while.

 

[FactoryChrome]

awesome! thanks for the pics guys!
so what would be the best sensors for me to run @ 600hp
AEM or the GM ones? i was thinking AEM.
and what vehicles does the sensors come off of? say i wanna got to a junk yard and find them on a vehicle.
thanks!
i dont feel good today

AEM are "non standard" 4v sensors (.5v - 4.5v)... The sensor is not what will make you reach 600 hp because a v8 could use a 2bar map and run 14psi and reach that horsepower. You pick the sensor needed to tune for the boost pressure your turbo will need to run to achieve your power goal.

My IAT is post BOV... and my MAP is on it's own dedicated vacuum port as far down on the intake manifold as possible from the throttle body.

 

[justin90gsx]

i plan on running 25-30 psi of boost so would the GM sensors do just fine?

 

[mindset]

boy does running speed density clean up a lot of shit.

 

[snowborder714]

Here's where I mounted my AEM 5 bar MAP sensor on a 1g intake manifold.

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If you have a SMIM (and a threaded MAP sensor), you should thread it into the plenum for the best response time.


And here's where my AEM IAT sensor is (in my throttle body elbow).

<img src="http://www.dsmtuners.com/gallery/files/7/4/5/6/5/img_7145___copy.jpg" alt="Img 7145 Copy" />

 

[justin90gsx]

that looks way good! where did you get the bung for the IAT sensor?
does anyone have a pic of a map sensor threaded on their SMIM?

 

[snowborder714]

My welder provided mine.

You can get a steel bung from here.
Canton Racing Products 20-883 - Canton Racing Weld-In Bungs - Overview - SummitRacing.com

You can get an aluminum bung from here.
http://www.summitracing.com/search/...-8-in-NPT/Bung-Material/Aluminum/?Ns=Rank|Asc

 

[lowell]

I tapped my map sensor in the same spot as Snowborder714, and air temp sensor near the BOV. Keep in mind you want the air temp sensor before any methanol jets.

 

[TurboTJ]

Here is a picture of the setup I used (on RRE's site). Road race engineering sells the bracket. I am very happy with how it looks and have never had a problem with it!

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Almost at the bottom of the page.Road Race Engineering's Eclipse Gauges

 

[ed_GST]

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Here you can see my GM 3bar MAP
Soon ill be getting the adapter to source the boost from the stock MDP location
Also i have the IAT but haven't installed it yet

I'm running speed density on my 2G using Ceddy mod ROM and H8 ECU

I haven't dynoed it yet due to clutch install but turbo spools and feels faster

 

[justin90gsx]

thanks TurboJT thats exacty what i need!
i can do what sowboarder714 did to his stock IM till i get a magnus SMIM and have them weld a 2g/evo sensor bung on there and use that RRE adapter!

so does anyone know what GM vehicles have the specific MAP and IAT sensors to use for speed density? or even a close up pic of the numbers on the map sensor and the IAT its self but it would be easier to know what car they come from and year,
ECM LINK has the part #'s, i work at a GM/ mitsubishi dealer and might have them laying around

ANYONE? got the info on what cars the gm MAP and IAT sensors came off of?
thanks

 

[99gst_racer]

does anyone have a pic of a map sensor threaded on their SMIM?

My AEM 5-bar mounted on my Magnus SMIM.

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so does anyone know what GM vehicles have the specific MAP and IAT sensors to use for speed density?

The GM IAT sensor and pigtail cable can be had for relativily cheap through several different manufacturers. I'll post up some part numbers tomorrow morning when I get back in my office.

I would steer clear of any AEM map sensors, they are 0.5v to 4.5v effective scale 4.0v. Unlike the GM / Delphi 5v full resolution.

Thanks for sharing, Curtis. But would you mind explaining why that makes an AEM sensor not good to use?

 

[the_mork]

Thanks for sharing, Curtis. But would you mind explaining why that makes an AEM sensor not good to use?

The reasoning is pretty simple. with most other sensors you have a full 5 volts of range and the AEM sensors only provide 4 volts which cuts your resolution by 1/5. In most cases this isn't an incredibly big deal especially with a 3bar map but when you move into the 5bar range you have the potential for issues. I'm fairly certain I've never heard of anyone really complaining about issues arising from that but we all prefer the best resolution possible when it comes to very important sensors.

 

[snowborder714]

i can do what sowboarder714 did to his stock IM till i get a magnus SMIM and have them weld a 2g/evo sensor bung on there and use that RRE adapter!

If you get an SMIM, there should be no need to weld on a 2g/Evo MDP sensor bung and use the RRE adapter. Just thread it in as Paul posted above. The bottom of the plenum will have ports to accept threaded nipples/items (i.e. MAP sensor).

so does anyone know what GM vehicles have the specific MAP and IAT sensors to use for speed density?

I assume you know about the part numbers listed here?
sdsetup [ECMTuning - wiki]




I have been running an AEM 5 bar sensor for a while now (since before v3 came out) and it's been great. Granted, I'm not pushing a lot of boost. But I compared this with a 0-5v 65 psia sensor and the readings are extremely close and driveability felt the same.

 

[justin90gsx]

ok ill just be threading in a nipple and be using a gm 3.3 bar for now till i run 30+ psi boost and can afford a aem 5 bar.

yeah thanks, i found those part #'s yesterday, and did some research at the parts counter and the 3.3 sensor comes from a 6.6l turbo duramax diesel from 01-07

 

[99gst_racer]

The reasoning is pretty simple. with most other sensors you have a full 5 volts of range and the AEM sensors only provide 4 volts which cuts your resolution by 1/5. In most cases this isn't an incredibly big deal especially with a 3bar map but when you move into the 5bar range you have the potential for issues. I'm fairly certain I've never heard of anyone really complaining about issues arising from that but we all prefer the best resolution possible when it comes to very important sensors.

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?


justin90gsx - MSD offers the GM IAT with pigtail, part number 2320.
Or if you just need the sensor by itself, you can buy it from F.A.S.T. (307004) or from Accel (74773). Summitt Racing should stock all three of these part numbers.