Relocate IAT Sensor

[madmunky]

Just looking ways to reduce the reading on the IAT sensor has anyone done this before?

http://kb.ls1gto.com/KB/article.aspx?id=10279

Surly the way the IAT sensor is currently mounted on the side of a metal plate which will absorb heat isn't really an accurate way of reading the intake temps, not saying this is the best way but at least moving it next to the TB on the rubber intake pipe would be better than the current location?

[ringram]

The whole point of the IAT is to measure intake temps. So lying to it by placing it somewhere where it cant do that is a bad idea.
It is used for loads of different things in the ECU including some irrelevant stuff like fueling and spark timing!

If your tune is good moving it will make it bad. The main point is that the IAT accurately tracks intake temp. If it tracks it consistently 10* too high thats fine as long as the tune is built around that. Obviously the stock tune is designed for stock location.

Theoretcially if you move the IAT and gain power its because the tune is crap.

[madmunky]

Thats fair enough but as its mounted to a metal plate it will be giving a false reading surely as its suffering from heatsoak and not actually reading the air temp

[Global-i]

I don't think you can do that on a SC motor the IAT is already relocated into the inlet manifold.
If you are using the LS2 style AIT there is a mod to replace the thermistor with a faster acting one, search LS1GTO.COM for Omega mod.
On My Harrop it uses a brass clad AIT sensor, part #25037388 which looks difficult to do the Omega mod on.

Edited by Global-i on Wednesday 19th August 21:59

[monkfish1]

Global-i said:

I don't think you can do that on a SC motor the IAT is already relocated into the inlet manifold.
If you are using the LS2 style AIT there is a mod to replace the thermistor with a faster acting one, search LS1GTO.COM for Omega mod.
On My Harrop it uses a brass clad AIT sensor, part #25037388 which looks difficult to do the Omega mod on.

Edited by Global-i on Wednesday 19th August 21:59

Correct. Dont move it, whatever you do. You will end up measuring air temp prior to the SC, which bears no relation to what goes on inside. As temps would be higher than the PCM is reading a very broken engine is the likely outcome.

[ringram]

You want it to read the airtemp as close as possible. So moving it away from there it may get a worse reading. At low airspeeds the air itself will heat soak anyway, at higher airspeeds its closer to ambient. You probably want yours after the blower anyway? Otherwise it will be way out Id have thought.

Dont tell me you are wanting more power mate?

[madmunky]

Not more power yet need to get down what I have but with the weather this week even driving up the motorway I'm seeing temps of around 63 then driving though town or slow speeds it's going up to 70 and as it's set to retard the timing at 65 just wondered if there was anythink I could do to help reduce the temps if I turn the car off and go back to it 30mins later it reads at 80 all just seems high having a black bonnet in the sun doesn't help either I guess but cause these are aus cars I would have thought they where used to high temps

[ringram]

Ah the joys of supercharging Thats why some of us dont mind mid summer dyno days and others run scared!

BTW Stock setup pulls timing from 30*C.

[madmunky]

Dyno day wouldnt be a problem cause the bonnets up

[S800VXR]

madmunky said:

Dyno day wouldnt be a problem cause the bonnets up

Here we go again.... up down up down, its like describing an HSV porn movie...

As for temps, get ya bonnet vented! makes a big improvement amd remove all that cotton wool wadding under it at the same time, its like wrapping the engine in a big blanket!

[madmunky]

Roger, What kind of temps where you reading before and after, did it make a big difference?

Also who did your bonnet again?

[ringram]

And probably a bigger intercooler. Or Methanol, or water spray, or NOS etc.

[madmunky]

ringram said:

And probably a bigger intercooler. Or Methanol, or water spray, or NOS etc.

All sound like good ideas and couldnt hurt

[S800VXR]

I dont log things mate - seat of the pants kinda guy! (or tech stupid!)

But the fans hardly come on now, it feels responsive all the time and you can feel the heat coming outta the vents. As for the Co that did it, Cool Louvers in Winchester - their on the Net. I might get some more put in actually whilst mine is being rebuilt...

Ive also got a water spray bar already fitted and with my new air filter location I will have room for a nice big water tank to feed it. Watch this space... oh and a bigger IC will also be going in whilst it is being done.

[crisisjez]

madmunky said:

ringram said:

And probably a bigger intercooler. Or Methanol, or water spray, or NOS etc.

All sound like good ideas and couldnt hurt

Chris, re intercooler, you have a custom jobby on yours that is much larger than the std item

Re bonnet louvres, at Vmax Roger (S800VXR) had no temp issues at all but I (with the identical setup to his btw) had to baulk a couple of starts as the car overheated queing. (Still beat him though, even after I showed him how to drive properly )

[madmunky]

crisisjez said:

Chris, re intercooler, you have a custom jobby on yours that is much larger than the std item;)

Re bonnet louvres, at Vmax Roger (S800VXR) had no temp issues at all but I (with the identical setup to his btw) had to baulk a couple of starts as the car overheated queing. (Still beat him though, even after I showed him how to drive properly )

Cheers Jez, Will look into the Louvers as they cant hurt really. I also want to look at doing something simular to Harry and cut the front bumper to allow better air flow to the intercooler.

[crisisjez]

Don`t bother, the limitation is the cooler matrix under the blower, was just talking to Roger about this and I recon that a few equipment cooling type fans sucking air from the engine bay out through louvres will go an awful long way toward combatting static heat soak.

[madmunky]

OK louvres it is then, I have a load of 12v fans around I'll give them a try. Roger was the bonnet usable after have the louvres done or will it rust if its not resprayed strait away?

[S800VXR]

The guy does give it a quick spray with some aerosol paint but I wouldnt want to leave it outside in the rain TBH! The edges are bare metal so the quicker you get it re-painted the better really. Also - Id go for more vents next time, they look cool anyhow so Im just going to vent everywhere!

Re what Jezz says about the cooler limitations, the matrix inside the inlet is the limit, I dont doubt yours helps being larger than stock but it wont give alot really. Try using Water Wetter in the system as well, it works well on Turbo bikes and such like.

Also - you have PM!

[TerryS]

S800VXR said:

Try using Water Wetter in the system as well, it works well on Turbo bikes and such like.

Really, I have tried it twice and though it was expensive junk!