Microtech LT10 Air temp sensor. What to use???

[TheStitt]

Pick up a LT10 second hand fitted to the 7MGTE I've bought. I didn't get the inter cooler set up with it so I didn't get the air temp sensor. I've taken a pic of the plug to it, does this look familiar??. I've been told a sensor from a common whore would do the job.



Any input would be great

thanks Stitt

[MWP]

Yup.
Microtech's use the GM/Delco temp sensors.

Looks like this:

[ddeane]

AS he said use the commodore one. Last one I got was about $15 from Autopro.

Craig

[Cuzzo]

I used a toyota 4age one but that was with a 4agze base map.

[The Witzl]

Stitty - you can get the car running without an air temp sensor for now, it isnt essential to being able to run the engine.
It might run a little rich though

[YLD-16L]

Stitty I use these Delco ones on the rolla and I need one to replace the current faulty one, they come in two thread types though so be aware of that. I run the metric thread type which comes on a particular model of commodore (which one I don't know?).

It was more painful than walking on glass trying to find one locally last time as most places here are staffed by useless kents. Prices were wayyyyy more than Craig quoted above too, I'd love to grab one for $15.

If you find the metric ones locally for a reasonable price let me know.

If nothing turns up I'll just grab one from Haltech online.

[CrUZida]

They should be 14x1.5 on the Aussie cars.
Maybe the US cars have an imperial thread.

I would have thought closer to $60 ea.

[YLD-16L]

I grabbed one from an eco-tec powered commodoe at one stage and it had a gas fitting type tapered thread and old mate at Holden said he "thought" VT onward had the metric 14mm thread but he didn't have any to compare so who knows??.

I think I paid about $45 or so for them from Haltech, their postage is a killer though as they have a minimum postage cost.

[MWP]

Stitty - you can get the car running without an air temp sensor for now, it isnt essential to being able to run the engine.

Tis true, when i bought my car (Microtech already fitted), it had never had an intake air temp sensor.
Ran fine.

I got mine from u-pull-it... free

[Cuzzo]

From what im aware, they only use it for a display?

[YLD-16L]

From what im aware, they only use it for a display?

Nah that's the O2 sensor you're thinking of. They do run an air temp correction.

Yes you can run without one as everyone has said but it will run better with one set up with the right corrections entered. Mine stopped working at the 6 hour and the difference in AFR's at various temps has been noticeable since.

Because the microtech is so crude though it can only correct in the size steps that are pre programmed in the injector opening times i.e. you might have -3% in the air temp table at a particular temp but if that correction is less then the injector opening time value either side of where you are at it won't do anything.

So the difference in running the temp sensor or not is more noticeable at larger injector opening times than smaller ones i.e. under load.

[thechuckster]

Stitty - you can get the car running without an air temp sensor for now, it isnt essential to being able to run the engine.

actually, for a turbo engine you should consider it manditory.

[TheStitt]

Thanks all for the input. Not to sure where to look, but will. I'm sure Linden put a metric thread in my cooler pipe.

Shane order two and split postage???

Got a part number from yours??

[MWP]

actually, for a turbo engine you should consider it manditory.

You said this to me quite some time ago.
.... and i still cant work out why.

A turbo'ed engine tends to produce hotter air intake temps, getting hotter as boost increases.
Hotter intake air requires less fuel.
So not running a temp sensor just means that when on boost youll run richer than you should.
So youll loose some power due to being too rich, but other than that, its not problem.
Right??

[thechuckster]

air temp (plus MAP) determines density of the air+fuel charge in the combustion chamber (and thus available oxygen). Air at ambient is going to be denser than at higher temps and thus have more oxygen available for combustion (the fuel amount wont change as it's only referenced against MAP). So you can use air temp data to your favour for economy

Inversely, higher air temps lift the risk of pre-ignition and detonation. So you use that same data for engine protection.