[cris90]

wouldn't a faster responding theromostat result in more power because the ECU could add timing and fuel accordingly and get more power?

 

[Red Raspberry]

The IAT has an effect on timing. If yours has a 10 second delay then you might as well keep the OEM one.

MAP rpm are what drives the fuel table assuming you are not in closed loop. If you have a 2013 then the OEM WBO2 will handle the fuel trims no matter what state the throttle is in I would imagine.

 

[genspec13]

The IAT has an effect on timing. If yours has a 10 second delay then you might as well keep the OEM one.

MAP rpm are what drives the fuel table assuming you are not in closed loop. If you have a 2013 then the OEM WBO2 will handle the fuel trims no matter what state the throttle is in I would imagine.

it not 10 sec delay
it's a standard value to compare iat vs iat

i think it's the time to get 63% variation from a stating point of 75c
to and ambiant of 25C with correct air flow


http://www.itsirl.com/Manuals/ntctime.pdf

i can't find to article i readed before

but this one is not bad the delay is the time to change from 25 to 56.6C when transfered from a 25 to 75 c environnement

but with the new one you can see that it can reactfaster than the original
the original is 45 sec this one is 10 sec...i have seen 5 sec somewhere but i would have to look to find something faster


the one i had in mind
the would heat the thermistor to 75 with current (since it's a resistor)
and the measure the time to get back to 25

in the spec of bosch sensor you seem to need an airflow to achieve that value

 

[Red Raspberry]

The IAT I have is almost instantaneous.

 

[genspec13]

The IAT I have is almost instantaneous.

everything i look on the web is 5 to 10 sec for a standard iat
so unless you give me spec i will be suspicious

yes the value start to change immediatly but if you change the value to measure by 50 C of fast will it get there...immediatly ...don't think so

Oki non car thermistor value are in free air so with flow will get lower time.

Would like to see some log to compare to mine.

 

[Red Raspberry]

I only run around 20F difference above ambient. No way do I see or have a 50C drop. It all happens in one 3rd gear pull maybe 5 seconds. It will drop to near ambient then back to what it was and if I keep pulling then it stats climbing above the start point.

10 seconds is an eternity. Qt mile times are what 14 sec stock?

 

[genspec13]

I only run around 20F difference above ambient. No way do I see or have a 50C drop. It all happens in one 3rd gear pull maybe 5 seconds. It will drop to near ambient then back to what it was and if I keep pulling then it stats climbing above the start point.

10 seconds is an eternity. Qt mile times are what 14 sec stock?

i think you missunderstood the measuring system

it take 10 seconds to the sensor to show a 56.6 degree if the temps switch from 25 to 75C in 0 seconds that is the sensor spec not what the car see

so smaller change take smaller time to show up

if you look at the graph is obvious it take less than that to show some good result

just for fun try to get the info on your we'll see

 

[Jockobo]

It will definitely affect the tip in timing. How fast can the ECU compensate? Milliseconds I would assume.

When going WOT trims are not an issue as the ECU is using fixed tables.

Are you sure? I see for every 5% in LTFT the air fuel ratio changes half a point at WOT.

 

[genspec13]

Are you sure? I see for every 5% in LTFT the air fuel ratio changes half a point at WOT.

could be since LTFT is there to compensate for wear of the engine
but in wot there is nothing to confirm adjustement

BUT LTFT is not one value but multiple value its a table value rpm vs boost
i just don't know the exact size of the table

so if indeed it is using LTFT to in wot witch value to use ??

 

[Red Raspberry]

I probably am misinterpreting you results. The IAT sensor has and immediate response time. Data logging through the OBDII port has inherent delays and the more you log the worse it gets.

You can log measure the voltage at the ECU input. This will be immediate but difficult to log.

 

[genspec13]

Update

after some driving the sensor does seem to be a bit off for a 2013
i end up at idle with ltft of -40 and -10 in drive
if i revert to stock everything goes back to normal
i removed my bov and intake just to confirm it's really the sensor

 

[Red Raspberry]

What kind of IAT are you running?

 

[genspec13]

i have/had the piranha racewerk 3 bar IMAP

 

[Red Raspberry]

I can say I have had absolutely no issues with the one I have for the time it's been in. It works just like the OEM except instantly.

 

[genspec13]

yeah temp reading is much faster
but map is probably a bit off from stock i had lower than 1 psi engine off
you don`t need much offset in PSI to get some variance in LTFT
will see with sfr when i get my tune

 

[nyangineer]

Bamp, any conclusions here?

 

[Red Raspberry]

If you want the ECU to see real time temperature data then you need to ditch the slow reacting OEM IAT sensor.

Absolutely no problems after all this time.

 

[nyangineer]

And that's with PRW's sensor? What sensor do you have? Apologies if this has been mentioned in a previous page.

 

[Red Raspberry]

I have a Triumph 955 IAT sensor from a motorcycle.

 

[nyangineer]

Just saw the graph vs. the Mazda IAT sensor, that's incredibly fast. Meow.