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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 01-19-2008, 10:23 AM   #1
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Supra AFM in 22re

I used a Supra AFM #22250-35020
#197100-2470
I won it on ebay and looked similar to the 82 Supra AFM.On both ends of the AFM is 3 inches big.The inside of the AFM had different electronics that would not work with the 22re computor.So I took apart my 22re AFM plug-in,circuit board, and needle.Everything fits perfect and I soldered it together and made a 3" pipe with a 3" hose connected to the AFM and a 45 degree coupler to the LC big throttle bore (later type).
The truck has 33's with 4:88 gears and was running just fine even but it lags on the throttle even with DT tri-Y headers and Flowmaster super 40 muffler and large 2.5 pipes with the stock AFM.With the Supra AFM & later type plenum & LC big throttle bore ,the truck on the shift it seems to have a smoother airflow & response on the throttle and much better pickup even while running lower speeds on higher gear.The lag on 4th gear up the hill is unnoticeable.I will later post the pics today.The rest of the block,head & cam is stock.
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Old 01-19-2008, 02:47 PM   #2
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Heres the pics
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Old 01-19-2008, 07:43 PM   #3
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ok buddy you have some explaining to do here what did you do to get rid of the 4th gear hill climb go away? you took a soup air flow and took the stock 22re air flow insides and put them in the soups case?? so that the stock 22re is now a 3in flow throw insead of the 2in?
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Going wheeling and going swampthinging are two totally different things. Wheeling is doing something with the expectation of having fun in the process. Swampthinging is doing something and knowing you'll probably end up in a hospital in the process.
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Old 01-19-2008, 08:14 PM   #4
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i believe a write up is in order......
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Old 01-19-2008, 08:16 PM   #5
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Quote:
Originally Posted by just a 22re View Post
ok buddy you have some explaining to do here what did you do to get rid of the 4th gear hill climb go away? you took a soup air flow and took the stock 22re air flow insides and put them in the soups case?? so that the stock 22re is now a 3in flow throw insead of the 2in?
Everyones 22re is different from others because of different set-up.My engine is high mileage stock till I overhaul and replace my clutch with a 6 puck clutch from Trail Gear.Today I ran my truck more on the flat and hills on 4th gear.The engine responds much better on the throttle comparing to the stock AFM & stock later type TB that I had on before.The top end is not what Im looking for its the bottom end is more responsive even while shifting quickly up to 4th gear on the flats and climbs hill much better.
I have another truck that has more engine mods but not expensive like a complete LCE motor.I also have a 82 Supra AFM with early type LCE TB on it.This truck runs really well on the low and top end and it accelerates fast because Im running 30 x 9.5 tires & 4:56 gears.Even with 31 x 12.5 the truck easily spins the rubber like a car.
The truck still gets 18mpg worst and 22 mpg best.
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Old 01-19-2008, 08:26 PM   #6
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so how did you do this cause im guessing im not the only one that wants to do this mod and you just opened a big thing with the 22res here we all want the 4th gear hill climb to go away so do i smell a right up here?????
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Going wheeling and going swampthinging are two totally different things. Wheeling is doing something with the expectation of having fun in the process. Swampthinging is doing something and knowing you'll probably end up in a hospital in the process.
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Old 01-19-2008, 09:13 PM   #7
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yeah, people have been doing this for a while. you can probably find info on it by searching the 'net. though, i don't think you have to switch the electronics if you get an AFM from a 5mge.
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Old 01-19-2008, 09:17 PM   #8
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so get one from a 5mge and it should work right? cause i really wanna do this here i like having power thanks
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Going wheeling and going swampthinging are two totally different things. Wheeling is doing something with the expectation of having fun in the process. Swampthinging is doing something and knowing you'll probably end up in a hospital in the process.
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Old 01-20-2008, 03:19 PM   #9
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so get one from a 5mge and it should work right? cause i really wanna do this here i like having power thanks
I cant find the ebay AFM that I won but on both ends its 3" around.I won another supra AFM but it was the wrong one to use with the 22re.The person that was selling these had a lot but now I dont see any.You just got to keep looking around.
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Old 01-20-2008, 06:16 PM   #10
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All he did was use the supra housing and the guts out of the 22re and resoldered the wires. Thats it. Since the Supra has totally different electronics you would have to use the 22re guts unless you want to fabricate the harness. I believe the Supra VAFM has the intake air temperature sensor built in it and the 22re has it in the intake.

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Old 01-20-2008, 10:07 PM   #11
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ahhhh thanks man that makes alot of sense there
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Going wheeling and going swampthinging are two totally different things. Wheeling is doing something with the expectation of having fun in the process. Swampthinging is doing something and knowing you'll probably end up in a hospital in the process.
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Old 01-21-2008, 04:53 PM   #12
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the 5mge AFM is bolt- on. the 7m isn't
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Old 01-22-2008, 07:52 AM   #13
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I'd love to convert the VAFM to a more modern MAF. It wouldn't be that hard to do, but I don't think there is enough demand to make a kit to cover the cost of the dyno time needed to calibrate a conversion.
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Old 01-22-2008, 08:00 AM   #14
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Ok, so what ya need to do is find the correct AFM, then take the guts out of a 22re and put it in there and hook it all back up?
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Old 01-22-2008, 08:31 AM   #15
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I'd love to convert the VAFM to a more modern MAF. It wouldn't be that hard to do, but I don't think there is enough demand to make a kit to cover the cost of the dyno time needed to calibrate a conversion.

Assuming you could do it - and the stock AFM uses a very non-standard signal structure, which is why most piggy backs don't work with the 22re/22rte:

Why do you need a dyno to tune it? You could do 95% of the tuning on the road via a wideband.
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Old 01-22-2008, 10:19 AM   #16
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yeah i tried a safc in my truck no luck ran like crapy crap but it looked good telling me the rpm's and tradle angle
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Going wheeling and going swampthinging are two totally different things. Wheeling is doing something with the expectation of having fun in the process. Swampthinging is doing something and knowing you'll probably end up in a hospital in the process.
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Old 01-22-2008, 11:10 AM   #17
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Assuming you could do it - and the stock AFM uses a very non-standard signal structure, which is why most piggy backs don't work with the 22re/22rte:

Why do you need a dyno to tune it? You could do 95% of the tuning on the road via a wideband.
The weird signals from the VAFM could be duplicated without too much fuss. (Ah the world of micro controllers.) I did consider just sticking a MAF inline with the VAFM to get a starting point set of signals to work with and I guess you could refine it over time with a wide band O2 sensor. Of course. ECU is going to do that for ya as well over time. Hmmm. The dyno would be nice because you could see if you're really getting any bang for buck.
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Old 01-22-2008, 01:32 PM   #18
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Quote:
Originally Posted by InternetRoadkill View Post
The weird signals from the VAFM could be duplicated without too much fuss. (Ah the world of micro controllers.) I did consider just sticking a MAF inline with the VAFM to get a starting point set of signals to work with and I guess you could refine it over time with a wide band O2 sensor. Of course. ECU is going to do that for ya as well over time. Hmmm. The dyno would be nice because you could see if you're really getting any bang for buck.
I agree that a broad range of signals could be duplicated. It'd take a decent amount of testing, probably a programmable IC, and a good understanding of electronics.

I wouldn't stick *anything* in-line with the VAFM, unless it had an extremely high impedance - otherwise you're going to impact the values read from the VAFM.

I would, however, probe the VAFM with a oscilliscope and various RPMs. It'd be best to do it under load, which is going to be hard.


I'm not convinced that the 85-88.5 ECU has any sort of "learning" capacity. Learning capacity may be true of more recent ECUs, but I've seen no evidence or documentation on 85-88.5 that says it can learn mixture. It does adjust, within limits, when running in closed loop.

The narrowband 02 will never be as good as a wideband. It knows 3 things: rich, lean, and stoich. It doesn't really know how rich or how lean.

Would I mod the AFM? Sure.. I'd do it in combination with modding the TB also and a late model plenum... If you compute the area of the stock AFM flapper door and the 55mm TB, you'll notice that they are very close. I'm also appreciative of this "how-to" as I see people ask about it a lot.


Will this make a difference on a stock truck? Dunno... Let us know!
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Old 01-22-2008, 02:30 PM   #19
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What I meant by inline was not to place the MAF inline with the electrical signals. Rather, I would put the MAF between the VAFM and the throttle body. A data acquisition system would be needed to record the signals from the VAFM and the MAF so that you could build a signal conversion table.

This isn't hard to do, but as I mentioned, it's questionable as to whether it's worth the effort and cost.
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Old 04-24-2008, 02:17 PM   #20
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So what year of the supra AFM would work on a 1989 22re?
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Old 04-24-2008, 02:17 PM
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