Can you have ACTs that are too low?
Turbo Mini Forums

got a part no?

i'll take a look at the resistance curve.

Well, as I have my engine and EMS all over the garage floor testing various things, I thought I would like to know...

So IAT unscrewed from plenum


Apply these alternately, 3 seconds heat, pause, 3 seconds cold air


And watch scope


I can't display MegaTune at the same time as running the scope (Windows conflict) but MegaTune shows a 20 degree (sorry Paul, it's warm in Suffolk) to 65 degree swing.

It seems pretty responsive to me.

This is a cheap fleaBay copy of the Weber-Marelli (Cosworth) sensors that I'm setting up to use.

Schrödinger's cat - so which one am I ???

Own the day

Just looks like a standard PRT 100. You would need make it into three or four wire or you will have a constant offset on your readings.

my sensor seem responsive enough, the argument i (think) stevie is presenting is that temps should never drop under boost, period. therefore something is amis. if i can find a spare thermocouple i will get testing tonite as the roads are dry.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

manifold heat soak denis , stick it in a plastic pipe just after the ic ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Own the day

They still won't be accurate if left as two wire, whether there is one, two, or a thousand installed together. It is only as good as the installation and the measuring instrument.

Own the day

I had previously been using this type.

Sorry for pinching your pic RT



Thats the shite slow type.


Im now using one of the open bulb type sensors from a Cossie myself. The difference is like night and day.....or hot and cold.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

hmmm,

i'm using the mpi IAT sensor, it dosent seem to do much, reads a bit higher than ambient most of the time, and rises maybe 10 deg when there is boost (8psi), will headt soak really bad when you stop and shut the engine down though,

I was under the impression the sensor was internally themally isolated, but i think i am going to have to make a non metalic bung to sit it in, or move it to the silicone hose just prior to the TB.

I think i have a datalog of some high boost somwhere, i'll have a look for it.

here we go,

a hard squirt in 3rd and 4th (IIRC)

note how the temp ramps up to 80 odd deg when the throttle shuts.

Edited by Joe C on 28th May, 2009.

you need to hold it for longer in 4th, to give the sensor a chance.

Or else just do one long pull in 4th. Say for 15-20secs if possible. Even a slow sensor should be reading about right after 20 seconds.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

emmmm what i say ? lol

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

An insulating "bung" will only slow down the heat soak, not stop it.

What you need is a fast response sensor so when you go to restart the engine, it responds to (and reads) the temperature of the incoming cold air very quickly - otherwise the ECU is doing the wrong mass calculation for the fuel to restart it cleanly.

Edited by Rod S on 29th May, 2009.

Schrödinger's cat - so which one am I ???

the thought of holding it on boost is a little worrying, especially with the roads round here.

need to find an airstrip me thinks.

I think i'll pull the sensor and check the response as you have done rod.

yes you can go too low i found out the hard way kinda when drivin but thats a story for another day lol

Currently building the new engine - 1312 t25 a series!

Attached is some data from temps taken before my intercooler.

I have two sensors mounted in my intercooer pipe, one is the bulb type temp sensor, the other a K type thermocouople. These are mounted within an inch of each other so should be exactly the same.

The Red line is the thermcouple, and the black line is the std cossy /rover bulb type.

The sensors do read the same if left together long enough, it's just simply the thermocouple is almost instant while the other has a much slower responce.

Team Racing

doh, attachement didn't work

Team Racing

The one im using is a Rover one. I installed it into the hose to avoid heat soak and works really well.

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

That is the type I use, and it's still a lot slower than the thermocouple

Team Racing

It would be interesting to compare it to the Cossie one - although they are both open bulb so should be equally responsive.

I'm not surprised a TC is quicker but how many EMSs accept them as an input ??? (there are probably some but not the one I'm using !!!)

Schrödinger's cat - so which one am I ???

Is that just a regular K-type TC ?

Innovates TC-4 can log 4 of them at once, and isnt too expensive.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

yes stevie, just a K-type, I went for one with a very small mass, then simple drilled out an m5 bolt and epoxied it in place.

Team Racing