Air temp sensor ( racing type ) too much variation at idle leaning when very hot.

[Skalabala]

When it comes to stock ECU I know almost nothing As there are only a hand full of starlets this side of the world.
For me its Stand alone all the way
But yes an ECU can alter timing in regards with air temp. Cooler temp will retard timing. But usually hot temp will not alter timing.

 

[Rev]

Short update .
I have found the fast acting sensor is used in the tubing before the intake with success.

Alot of credit to people on these links -

http://www.imoc.co.uk/forums/viewtopic.php?t=137609&highlight=


http://www.rx7club.com/3rd-generation-specific-1993-2002-16/testing-oe-iat-sensor-compared-fast-reacting-iat-sensor-882534/

Current updated verion available on this link
http://wannaspeed.com/home/9-fast-reacting-iat.html
and old triumph versions seem to be extant also.

This new version leaves the wires less exposed to pressure bending back and forth that some report can snap a wire at about 10,000 km in a few cases but others have 50,000 km no problem.


The fast acting sensor Fenne developments sold is actually a triumph motor bike sensor with a thread adaptor it is thermistor type. I think they have used the 05-09 TRIUMPH SPRINT ST 1050 but the history in the links above looks like the sensors are made by Sagem for Triumph they also did an ecu for the bike which was new generation of fuel injected sportbikes, the Triumph T509 Speed Triple.

As far as I can tell the old one currently on the net has a number 1292004 and are black made in china and UK I have the Fenne Developments Celica RIAT one its number is 60/91 black with red wires made in china not sure why the fast sensor in the links above is green though.The new Rx-7 one in the link above is black with brass sheaf (Triumph Daytona fast sensor type ) and is numbered differently.

 

[Rev]

Update I have installed the 05-09 TRIUMPH SPRINT ST 1050 ABS air sensor to just before the throttle plate. This is smaller and will not disturb the air stream in the intercooler pipes as much as the sensor with the adaptor and/or with the additional brass shroud.

So far idle is smoother when moderately heat soaked but lean spool seems to be reduced boosting is slower from 2000-2500 and the surge in power I get at 2500 has shifted sometimes 2600 or even 2900 rpm. It will take time to properly access this as temperatures here are swinging widely.
First impression with my safc2 I could lean / improve acceleration closer to the fast acting sensor in the stock position but this will effect idle so at this stage switching between sensors using the tps idle switch looks attractive.

I am finding some light oil spray on the stock postion sensor theristor so may be better before the throttle plate in that respect.
I will do some back to back tests but this is some time away.