7mgte map sensor

[Heavy_D]

first off i dont own a supra but i have a turbo map sensor that came off of 1990 supra with a stock 7mgte motor, i would like to know if there is any diff from the 1990 single turbo supra and a 94+ twin turbo supra? like does one push out more voltage or do they both do the same? reason why im asking is i have a turbo tercel with a 4efte motor from a starlet, and i have a 1990 turbo map sensor and i have the clip harness with it and i would like to use it on my tercel.

Thanks

[Jeff Lange]

The only 7M-GTE that had a MAP sensor, is the 1-month production MA70 Turbo A produced only in Japan during August of 1988.

Do you mean AFM?

[Heavy_D]

no im talking about MAP sensor and yes to make sure i know what a supra is also since i worked on them alot but the non turbo, and yes it was a 1990 with a 7mgte, on the map sensor it says "sensor assy. turbo pressure", im pretty sure that all or most of all toyotas uses map sensors



now all the turbo sensor i have seen are yellow just like this one
number on it is
89420-14020<- thats the top number
100798-0890<- thats the bottem number
5V 5k17


ok heres a good pic, i just scaned the sensor so remember 1990 toyota supra, and yes thats my finger

[Heavy_D]

well any ways all i want to know what is the difference on a 3rd gen TT supra map i heard that 2-3gen supras uses diff sensors, that one pushes more voltage which was the 2nd gen single turbo supra, and that what i need is a 3rd gen TT supra or i think a 89 MR2 4agze(supercharge) but im asking cause i got my hands on the supra which are easy to find for me and i just love them to death

[Heavy_D]

so no body knows the diff on the 2nd and 3rd gen supra turbo map sensors? does one makes more power than the other or no? like does it do more Voltage or no

[Jeeves]

Most of us have worked on a lot of them. I believe the Manifold Pressure sensor is a 2Bar sensor. The stock sensor on a 2JZ is a 3bar IIRC. Now, that is a vacuum/boost pressure sensor shouldn't be confused with Mass Air Pressure sensor.

http://en.wikipedia.org/wiki/MAP_sensor

The difference, if there is one, would be in one of two things:

1) They read to a difference maximum pressure. This means that 3volts would not mean the same as 3volts on the other sensor.
2) Their scalings/graphs are different, thus leading to improper control from anything that relies on that reading.

More voltage does NOT equal better.

[Heavy_D]

i know how it works, ight i have a single turbo 4efte on my tercel, and i would want to know if it will work for my tercel, some one told me to use a 3rd gen supra twin turbo map sensor for my motor, but i wouldnt see why i would need that one if i have a small toyota CT-9 turbo (stock) but supposable i wont get the right readings, now is that true or no? i really wont be doing no more than 8psi mostly around 5 or 6 around there isnt the 7mgte map sensor a 1 bar i think it is?

[Jeeves]

If 0v = 0psi, and 5v = 14.7 psi on one sensor, and on the other sensor 5v = 29.4psi, how would that not cause issues?

If you're going to come ask for help, attitudes aren't suggested. People will often ignore you, just a word of advice.

[Heavy_D]

who said i was giving an attitude? unless you can read my mind, im just asking you guys on the board what is the diff using a single and TT map sesnor thats all, so your assuming that im mad, im not in a rush to get my car started but i would like to get some info cause if i dont respone to my post then no one will, thats all

[bgrieger]

Well, what are the specifications of the MAP sensor you need? We can speculate all day as to what might work or not and only you will have the details you need as we don't have starlets or tercels with that engine swap (that I'm aware of). Generally, MKIII supra owners converting to a 2j use a standalone and a GM 2-3 bar sensor or the map sensor from a 2j car, and when we convert to a maft pro piggy back system for the MKIII we use the GM sensor as above, so even we don't bother with that sensor for anything engine control related. The sensor you have there Toyote only installed for the turbo pressure gauge, and I certainly wouldn't rely on it for engine management unless someone very reputable from the starlet community has mentioned that exact sensor is what you want.

[willtotheumm]

I know that engine swap for Tercel's. I planned on doing it in my 91 Terc (and i've driven a 93 4efte powered Tercel, far from stock however). But I do not know if the MAP from the Supra will work on the Tercel. Like Jeeves said... if the voltage is set for a specific bar, then it wont work.

[SupraTuned]

your everyday 3rd gen supra 7mgte doesn't have a map sensor

[Heavy_D]

well the one i grabbed it from had it, well this thread can get deleted, dont need it no more, and thanks for the info you guys.

[tgidavid]

That looks like the first generation boost pressure sensor -----INCORRECT INFORMATION REMOVED TO AVOID READER CONFUSION----- I ran into that issue during my Ra29 7mgte project only to find out that is really not needed.

You can try to use it as a map sensor, but from what I recall it doesn't respond to vacuum or boost over 14psi and its not recommended to be used as a map sensor to control the engine.

[CRE]

Given that the sensor you've got in your hand is ONLY used for the boost gauge on the MKIII Supra, not to mention that it's 20 years old... it's the last thing I'd try to retrofit into a different car. And everyone's dead right, whoever told you swapping it would help is an IDIOT.