One for the Megasquirt guru's

DaveEFI · Post by **DaveEFI** » Sat Aug 04, 2012 7:29 am

What I'm not clear about is how well an ATS measures the actual air temp and how much it is effected by what it is mounted in. And how much the air gets heated by the plenum, etc? Also, air isn't a particularly good conductor of heat, and the sensor can only measure the temperature where it is - not for example in the middle of the air stream.

SimpleSimon · Post by **SimpleSimon** » Sat Aug 04, 2012 9:07 pm

DaveEFI wrote:What I'm not clear about is how well an ATS measures the actual air temp and how much it is effected by what it is mounted in. And how much the air gets heated by the plenum, etc? Also, air isn't a particularly good conductor of heat, and the sensor can only measure the temperature where it is - not for example in the middle of the air stream.

Exactly Dave, it would be better mounted in a silicone hose nipple/T etc rather than something metal as it seems to absorb the heat from its surroundings

SuperV8 · Post by **SuperV8** » Fri Aug 10, 2012 8:22 am

What type of temp sensor are you using? open or closed type? The open type would react must faster to changes in temp. I was looking at my IAT sensor the other day as I was also thinking of the best position to put it. The thermister in my sensor actually looks well insulated from its surrounding metal body.

The ecu needs to know what temp the air is entering the engine, the danger with placing it in the air filter is you don't know if the air gets heated along the way through its various pipes. It would be a safer condition for the sensor to be heat soaked and read high, than to not acount for any heating and read low.

My sensor is located just before the throttle plate, after my supercharger and intercooler.

Also are you still running the supercharger? if so then the IAT sensor must be placed after that and any intercooler you.

Tom.

SimpleSimon · Post by **SimpleSimon** » Fri Aug 10, 2012 10:58 am

SuperV8 wrote:What type of temp sensor are you using? open or closed type? The open type would react must faster to changes in temp. I was looking at my IAT sensor the other day as I was also thinking of the best position to put it. The thermister in my sensor actually looks well insulated from its surrounding metal body.

The ecu needs to know what temp the air is entering the engine, the danger with placing it in the air filter is you don't know if the air gets heated along the way through its various pipes. It would be a safer condition for the sensor to be heat soaked and read high, than to not acount for any heating and read low.

My sensor is located just before the throttle plate, after my supercharger and intercooler.

Also are you still running the supercharger? if so then the IAT sensor must be placed after that and any intercooler you.

Tom.

I agree, although the air cleaner method is not a problem on normally aspirated cars

bobtail84 · Post by **bobtail84** » Sun Sep 16, 2012 9:29 am

Coops try these settings. These are what are used in my Rangie and have sorted out the heat soak issues. It's a N/A injected 3.9 RV8 but if you put the motor in a muddy hole ticking over for any length of time the heat under the bonnet is quite high with headman headers and these settings have meant that I have no heat soak problems. Obviously you may have to "tweak" the numbers a little for your engine but I would have thought that it will be fine as is. Don't forget to read the help file when you copy these into Tuner Studio just for general info.

This should work on most MegaSquirted V8's.

HTH

Jeff

Post by **Coops** » Sun Sep 16, 2012 11:52 am

Cheers Jeff.
i have an enclosed filter housing now with a cold feed from the front grill away from all heat sources and this has helped the heat soak problem loads, BUT will try your settings to fine tune it further, thank you,.

Im now working on fine tuning the ignition side of things a bit further, trying to get as much as i can out of the car now

are there any ignition maps on MS for the 4.6 that i can look at to see if im getting my map the right way??

Post by **Coops** » Sun Sep 16, 2012 12:16 pm

what vesion of MT you using mate?
im using tuner studio and dont have this correction table i have non linear MAT correction table

DaveEFI · Post by **DaveEFI** » Sun Sep 16, 2012 12:21 pm

You're presumably using Extra code, Jeff? Can't find that table here - I've stayed with B&G code to keep things simple. Perhaps I should change.

bobtail84 · Post by **bobtail84** » Sun Sep 16, 2012 4:12 pm

Coops wrote:Cheers Jeff.

are there any ignition maps on MS for the 4.6 that i can look at to see if im getting my map the right way??

I will have a dig round the hard drive but with your super charger there is a calculation for the amount of boost PSI to the amount of MAP/ spark advance, something like "for each lb of boost retard 1deg of spark" or something near that. I will have a look for that as well.

Coops wrote:what vesion of MT you using mate?
im using tuner studio and dont have this correction table i have non linear MAT correction table

I'm using TunerStudio MS(beta) 2.0.5d

DaveEFI wrote:You're presumably using Extra code, Jeff? Can't find that table here - I've stayed with B&G code to keep things simple. Perhaps I should change.

I'm using MSNS EXTRA James Murray and our very own Phil Ringwood's MSnS and very nice it is too..

Post by **Coops** » Sun Sep 16, 2012 5:36 pm

Ive not got the charger on yet mate thats for over the winter months,
im using Tuner Studio MS v2.0.6,
and can't find that table that you posted up lol

bobtail84 · Post by **bobtail84** » Mon Sep 17, 2012 7:49 pm

here you go.

and..

bobtail84 · Post by **bobtail84** » Mon Sep 17, 2012 8:13 pm

I've had a look for a 4.6 spark map and I don't seem to have 1. 5.2 eals, 4.2 RV8 and a 4.5 eals but no 4.6 RV8.

SimpleSimon · Post by **SimpleSimon** » Tue Sep 18, 2012 8:28 am

Coops wrote:Ive not got the charger on yet mate thats for over the winter months,
im using Tuner Studio MS v2.0.6,
and can't find that table that you posted up lol

Looks like he is using another MS firmware Coops as I cant see it either in that menu

I am running late Firmware and I am also using that version of TS Beta

Quagmire · Post by **Quagmire** » Tue Sep 18, 2012 9:12 am

I have that menu - am running MS1 Extra 029q.

Dave- is that with the changes to the *.ini file so that it references IAT readings for correction instead of coolant? That is how mine is setup at the mo - i followed the info on Elliots page:

http://www.mez.co.uk/ms15.html

DaveEFI · Post by **DaveEFI** » Tue Sep 18, 2012 9:13 am

Says earlier MSNS Extra. I'm confused.