I have a rev 3 turbo, it has a standard air intake temperature sensor, which is very slow to respond with up to date temps.(apexi pfc readings).
I remember a few years ago you could get the sensor off a rx7 which worked on the mr2 and was more responsive, however i can no longer find this sensor, so can anybody recommend this or another sensor i could buy that would provide me with more responsive temps. and work on a mr2, thanks
Last edited by Martin F on Sun Oct 25, 2015 9:39 am, edited 2 times in total.
Martin wrote:I have a rev 3 turbo, it has a standard air intake temperature sensor, which is very slow to respond with up to date temps.(apexi pfc readings).
I remember a few years ago you could get the sensor off a rx7 which worked on the mr2 and was more responsive, however i can no longer find this sensor, so can anybody recommend this or another sensor i could buy that would provide me with more responsive temps. and work on a mr2, thanks
I've had 5 or 6 of these over the years. I'll see if i can dig an invoice out of the accounts.
Martin wrote:I have a rev 3 turbo, it has a standard air intake temperature sensor, which is very slow to respond with up to date temps.(apexi pfc readings).
I remember a few years ago you could get the sensor off a rx7 which worked on the mr2 and was more responsive, however i can no longer find this sensor, so can anybody recommend this or another sensor i could buy that would provide me with more responsive temps. and work on a mr2, thanks
I've had 5 or 6 of these over the years. I'll see if i can dig an invoice out of the accounts.
defo get the one i used....
though it will show you running higher temps than your used to because its so quick to update! ha.
its ideal to read off the commander too.
think i was one of the very first to use one on the mr2 at least.
Martin wrote:I remember a few years ago you could get the sensor off a rx7 which worked on the mr2 and was more responsive, however i can no longer find this sensor, so can anybody recommend this or another sensor i could buy that would provide me with more responsive temps. and work on a mr2, thanks
It wasn't a stock RX7 part, but and aftermarket sensor designed for the RX7 that just happened to work with the ST205 and rev3+ SW20 with a threaded adaptor. It was called the RIAT (Rapid Intake Air Temperature). This is what both Jim and I have. However the last time I looked, I couldn't find any way of ordering one
id be interested to see how it responded on an OEM ecu mind you!!!
i had a power FC at the time.
but yeh it was an aftermarket part, not a rx7 item.
here was mine
jimGTS wrote:id be interested to see how it responded on an OEM ecu mind you!!!
The resistance specification was the same, so it's not like the ECU was gets the wrong reading... it just gets a more accurate reading
It's a pity you need to cut and solder the wiring harness to fit, so I can't go back to the stock lump of metal for comparison. I can't see it doing harm though.
I am talking about the effects of seeing more accurate readings on the oem ecu.
Ie how differently it would respond to heatsoak etc.
Cruising the oem sensor takes a while to return to ambient temps, on the other sensor it wouldn't, so I'm sure the engine/Ecu would act a little different to these readings.
jimGTS wrote:I am talking about the effects of seeing more accurate readings on the oem ecu.
Ie how differently it would respond to heatsoak etc.
Cruising the oem sensor takes a while to return to ambient temps, on the other sensor it wouldn't, so I'm sure the engine/Ecu would act a little different to these readings.
I would suggest all it does it add safety, particularly on spool-up, when the intake temperature increases before the stock sensor reacts. A quicker reacting sensor will all the ECU to fuel appropriately rather than fuelling leaner based on the spuriously low temperature reading.
I have one of the Fenne Development sensors on my MR2 with a ST205 ECU, I've noticed it runs leaner on boost (~11.0 AFR) than normal.
As hot air is less dense and this sensor picks up the change in air temperature quicker, the ECU is injecting less fuel on boost, hence the leaner AFRs.
The Fenne Development sensor is a Sagem sensor from a Triumph motorbike with a threaded adaptor so that it fits directly into the plenum.
Interesting to hear Jon, I did think as much.
Is some of that down to the st205 ecu as well though?
I may look into it a little further now it's jogged my memory this part.
jimGTS wrote:Interesting to hear Jon, I did think as much.
Is some of that down to the st205 ecu as well though?
The ST205 ECU does run slightly leaner compared to the Rev 3 MR2 ECU but they're both still <10:1 AFR by 6000rpm with the standard air temp sensor.
If it was easy to swap between the 2 sensors I'd gladly do 2 runs to verify that the sensor changes the on boost AFR, but the new sensor has a different connector and I've chopped off the original connector
Ive just bought a used triumph sensor, when it arrives I'll knock up an adaptor and get it fitted, it should be easy to make a plug and play wiring adaptor too as the bosch style connector can be bought with wiring tails for next to nothing and finding a male plug to fit the original harness shouldn't be too hard.
Thanks for bringing this to my attention
EX MR2 owner, currently on a '00 Honda CBR600 Follow me on Instagram @c35rob
Ha, I'm sure rob has found a winner for a few members.
Keep me informed rob if you can string a kit together.
Given I did this 5years ago, before many knew, I'd be interested in trying it out again.
Rob - East Coast Imports wrote:Will do Jim,
I can certainly supply a fitting kit if there's interest, I'd assume most people would want to source their own sensor?
What's the number for the right part? I presume it's got the same electrical properties?