Does anyone know the best/fastest IAT sensor?

I'm currently using a pair (before and after intercooler) and they are S..L..O..W...

132deg C air temp pre intercooler at the end of the quarter mile, FP Red and 23psi.
WOT to closed Throttle and the IAT is still reading 100deg C 5 sec later... Surely it should be near ambient?
and it is 80deg C on the return road after my run...

I remember Dave Buschur saying he had the "fast" reacting sensors when he did his intercooler testing.

Does anyone have part numbers for these items? Or anything else that reacts quickly?

Cheers, Mike

 

What FMIC are you using and what was the ambient temperature when you did these runs ? Inlet temperature seems very high for only 23 psi on a Red.

You may want to PM MrFred as I believe he has tested a few IAT (IIRC most run a GM sensor that was shown to respond very quickly).

 

exposed bead k-type thermocoupler

 

the Front Mount is just a crappy cheapo at the moment.
Ambient temps were low (20deg C) but i was starting my runs at 45deg C IAT from heatsoak. My car has no bonnet vents.
I'll PM MrFred, thanks for the info

oh i hadn't put the actual IAT in there... starts @ 45deg C on launch control, ends at 62deg C crossing the line (this is after intercooler).

 

what aby said, although i'd be leary of an exposed junction tc breaking from mechanical fatigue. some of the small diameter (1/16" inch) sheathed tc's are plenty fast. just make sure to insulate any sheathing outside the ic piping. a teflon swagelok fitting on the ic pipe connection would be good to use to insulate the sheath from the ic pipe.

what are you using to datalog? you need to make yourself a cold air box.

 

thanks for the input MrFred.
I'm using the PCLink software to display the logs, my Link G4 Ecu has internal logging @ 20Hz.
I definitely need to make myself a cold air box, i was running with the headlight out as well.

I'm currently running 2x of these...
http://www.trademe.co.nz/Trade-Me-Mo...-333797935.htm

with regards to the swagelok fitting, are you meaning isolate the sensor from the piping (from heatsoak) and so that if the sensor breaks off from vibrations when it wont go through the engine?

Is this a faster sensor than the sensors i'm currently using?
http://www.maperformance.com/gm-air-temp-sensor.html

Cheers, Mike

 

that's a gm iat sensor. its a thermistor style sensor. the sensor output is electrical resistance that requires a special type of input circuit on datalogging hardware. type k tc's produce a millivolt signal. they require an amplifier to convert to a 0-5v signal that can be read by a standard 5v adc input that all dataloggers have. running two sensors requires two spare inputs on the datalogger. if the link is highend, the inputs might be programmable (switchable).

swagelok fittings are a compression fitting for tubing. its primary job is to attach the tc (1/16" dia tube) to the pipe fitting on the ic pipe. a teflon fitting will also provide thermal insulation.

 

Some good info in this thread...Hey Mr. Fred, any pics of your cold air style box?

 

yes, posted in engine/drivetrain. its cardboard, so it looks like crap, but it works great and cost me $5 in cardboard. can be free for dumpster divers.

 

haha...yeah I saw that in your sig...wasn't sure if that was a joke or not...haha...

 

The Link is extremely High end.
I have plenty of analog inputs still unused (0-5v).
The sensors i'm running are thermistors also.

I'm just after the best IAT sensor available. So do you recommend the Type K sensor or the thermistor?
Do you have links to the 1/16 sensors? (if thats what you recommend)

And do you have any links/pics of what you mean about the swagelok fittings?

Cheers, Mike

 

T1 Racing has an IAT that is nice and maintains the GM IAT scaling

I've seen Tony ***** about how slow the GM is so I have to assume he put a good deal of effort into finding and verifying this sensor is worth it over the GM. I'll probably grab one of these when I redo my IC setup.

I'm pretty sure Buschur was using the GM IAT which has been documented numerous times as being too slow post IC and WAY too slow pre-IC if you want accurate results.

 

Thermocouple brand/model: Omega/KMTXL-062G-6 (go to omega.com) About $30 US.

Amplifier brand/model: VEMS/EGT amplifier (DSUB9), no sensor, with wire (need one for each sensor, go to www.vems.hu) About $30 US

Swagelok fitting: Turns out the Teflon fittings aren't available in small tubing sizes. Swagelok can make a 1/16" fitting out of nylon though, and that should be good enough. An example part number is: NY-100-1-2. This is a 1/8" NPT male x 1/16" tube compression fitting made from nylon. Its not a "stock" item, so you'd have to call it in. See swagelok.com for dealers in NZ. $10 US (here in the US.)