Fix/replace 7mgte AFM?
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7. What other substitutions for fuel management can get the job done and keep it done permanently?

I've researched this and have come to the conclusion that the permanent solution is a standalone computer.

The AFM is restrictive (about 30hp worth), and the 'next step' solution, say a Ford MAF, has yet to be proven to play nicely with the Toyota ECU.

The standalone uses a MAP sensor, and can be 'fuel mapped' well past 7000 rpm with no fuel cut. You can program in large injectors and still keep a steady idle.

'Piggyback' (to the Toyota ECU) fuel controllers cost $200-$400 and offer limited management because they don't control timing.

So you are at the point of keeping what you got for $300-$500 (AFM and piggyback controller), or getting more for $1100 (standalone).

Look at it from a cost perspective - Spend $1100 on a intake, headers (or good turbo manifold and downpipe), and exhaust to get ~25 hp or the same $1100 to get 30+ hp with the standalone.

Yes, you don't need to spend $1100 More, but then you could say you didn't need the 7mgte either.

Ken

 

2. Not really. Supposedly if you cut everything apart you can clean the mirrors.

3. If its over oil, yes. I recommend the new AEM filters myself.

4. Its pretty easy to find a stock one off the forums <$100

5. Probably about $5-600

6. Yes, same thing.

7. MAFT-pro or the various standalones

 

i will never use a k&n again in less i have carbed or map based car

 

I used the MAP ECU. You don't need AFM, it used map. They are about $399. I used this on my MKII with 7M-GTE, 550CC, Lexus V8 AFM but with this unit I remove my Lexus V8 AFM. You don't needed with this ECU.

 

What exactly is the MAP ECU?

 

Another HKS VPC type device.

 

Here is the company link

http://www.mapecu.co.nz/index.html

http://www.mapecu.co.nz/v2-fuelmap.htm for Supra Turbo and Supra Twin Turbo

http://www.mapecu.co.nz/v2.2-fuelmap.htm for Supra Turbo, Supra Twin Turbo, Celica Turbo, MR2 Turbo,IS300, Mitsubishi EVO2 4G63, Mitsubishi 3000GT, Mitsubishi VR4 (EVO0),Nissan 350Z/Infinity G35 & Nissan 300ZX Twin Turbo

They have the bin files on the CD in which you will get when you buy the ECU. They piggyback in the OEM ECU and you can control alot of stuff to your ECU for Turbo, NOS, Supercharger and also fine tuned your car.

 

Found CRC Mass Air Flow Sensor Cleaner next to the carb cleaner stuff at Checker. Supposed to be for cleaning MAFs, it has different ingredients than carb cleaner. I have a call in to their tech support to inquire about using it on the 7mgte Karman Vortex AFM.
Some general research indicates that it is useful for regular MAF sensor cleaning. I too may have a problem with my oiled K&N filter.

Heard from their tech support that checked with their chemist who said that they don't have enough/any info about toy/lexus AFM materials to approve its use.

What has been used successfully to clean the AFM and how was it used?

 

Alan, the problem is this little foil mirror that is behind a very tiny little hole. The shape of the air flow across that hole is supposed to make the mirror flutter according to the speed of the air flow. You can take the unit out and carefully clean the vane with just about anything, making sure not to get anything in that hole. The problem arises if you get anything at all in that hole, dirt, oil, cleaner, anything. Any sort of cleaner will leave a film on that mirror and causing it to lose reflectivity and the photosensor inside won't read anymore. Given the difficulty of disassembling the unit, its pretty much toast if it gets contaminated. Unfortunately, most any you find in a salvage yard are going to be fouled up too. A new one is $500-$600 from Jeff Watson. Remanufactured ones are $300 or so, but I can't imagine how they'd rebuild one. When you open one up, everything is encased in some sort of white gel. Don't know if that stuff can be dissolved or melted off or what. It seems the real solution is to modify it to use something other than a karmann vortex unit. I read up a little on the MAF-T conversion I think it was called but haven't talked to anyone yet who's actually done it.

 

So can we cover the hole while we clean the rest of the unit?
Would that type of cleaning do anything for its functioning?
Any clues as to what is actually failing when they go "bad"? the foil mirror? The hole gets plugged?
If the hole has stuff in it, can we dig it out or blow it out?

 

all u need is q tip and eletrical cleaner


use pare of piler and flatten the q tip so ti fit spray ti wiht he cleaner and wiper down words on the channle

 

My guess is if its misbehaving then its already got some dirt or oil or something on the foil mirror. I wouldn't try to use compressed air in the hole because my guess is that the foil mirror is probably not very sturdy. As Nashman suggests, you can clean the vane to ensure proper air flow, but thats about it.

 

I test drove a friends 89 Cressida 5spd R154 7M-GTE setup, wich is what inspired me to do the swap. I tested it with both the 7M-GTE AFM and the Lexus LS400 AFM. The difference was night and day. Both AFMs were in good condition, and the LS400's AFM made a huge difference in power and throttle response.

I picked up a LS400 AFM for my Cressida from a local junk yard for 70 bux! I recommend it if you want a cheap way to add power and an easy way to fix your AFM problem.

 

umm that is cause it is bigger afm houseing

in less you swaped out your eletroincs then you old ones were bad

ps runing a lex afm will make your car run lean witch is bad get fule reg and bump the persure or motor wil not last to long

 

I've done some research on the MAFT-Pro and have decided that is the route I'll be going after the swap is successful and running. It seems to be a great solution for the money and has some pretty neat features. Like the VPC and others, it completly gets rid of the AFM setup.
http://www.maftpro.com/tproinfo.shtml

 

MAP ECU $399 plus shipping

Here is the company link

http://www.mapecu.co.nz/index.html

http://www.mapecu.co.nz/v2-fuelmap.htm for Supra Turbo and Supra Twin Turbo

http://www.mapecu.co.nz/v2.2-fuelmap.htm for Supra Turbo, Supra Twin Turbo, Celica Turbo, MR2 Turbo,IS300, Mitsubishi EVO2 4G63, Mitsubishi 3000GT, Mitsubishi VR4 (EVO0),Nissan 350Z/Infinity G35 & Nissan 300ZX Twin Turbo

They have the bin files on the CD in which you will get when you buy the ECU. They piggyback in the OEM ECU and you can control alot of stuff to your ECU for Turbo, NOS, Supercharger and also fine tuned your car.

 

How does the Lexus make a 7mgte run lean?
How does that AFM and the 7mgte ecu and injectors = lean?

 

more air then stock mean not eghough fule you just can't throw on diffent bigger meater on your car wiht out issues the 440's will work just have to ajust your fule map

cheepest way is fule reg with out messing up the fule cut you wana bump it up not down aka sfac2

 

i have the MAF-T with GM Masssss. With the regular MAFT its just about the same as the LEX setup BUT your gm sencer never gose bad and if it dose its only 35 to 40 $ for a good used one.

Now having said that IF you get the MAFT and have a 89+ ecu you have to call me to get it to work right. The hac sencer is in the ecu and has to be modded.
The only people that know how to do this is me and the 2 poeple i have told.