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Help! 13mpg after Supra VAFM Swap!

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

Help! 13mpg after Supra VAFM Swap!

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Old 12-07-2009, 10:49 AM
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Help! 13mpg after Supra VAFM Swap!

hey everyone! first post, long time lurker.

anyways, after i swapped VAFM from a 85 supra onto my 91 22re, i cant get any better than 13mpg! i took the resistor circuit board from my stock afm and swapped it into the supra afm. i left the supra thing (center part thats connects to vane and rotates on the circuit board) instead of the stock afm's because the contact area was larger.

everything i read said it would be a direct swap, but my circuit board was a different shape, and didnt fit perfectly. one bolt hole lined up, and i had to cut a piece of metal to reach over to the circuit board to keep it secure.

another thing i remember thinking is that the vane spring in the supra afm seemed weaker that the stock 22re afm. i cant really confirm this though.

so the problem is im getting 13mpg compared to 19 before the swap. i think it could be the weaker vane spring, and i could just adjust the spring to be stronger. OR it could be that i didnt complete the swap by using the supra rotating thing.

below is a pic of stock AFM guts
http://i12.photobucket.com/albums/a2...e250/VAFM3.jpg
supra afm guts (original)
http://i12.photobucket.com/albums/a2...e250/VAFM2.jpg
supra afm after swap
http://i12.photobucket.com/albums/a2...e250/VAFM4.jpg

any thoughts would be appreciated.
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Old 12-07-2009, 06:21 PM
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I think the problem is that you put a late style circuit board into an early style afm housing. notice the different shape of the top caps? you might try puting it into an '86 supra afm. thats when the supra changed over to the late style housing.
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Old 12-07-2009, 07:07 PM
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thanks for the reply ld, that would explain it. after all the searching i did, i never saw any posts about and early and late style .

EDIT: after a little research, i found out the pre-88 22re vafms are the "early style." and i dont think they are interchangable. some one chime in if im wrong.

Last edited by mojavedude; 12-07-2009 at 07:18 PM.
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Old 12-07-2009, 07:41 PM
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I believe you can use an early style curcuit board in the '85 supra afm for your '91 22re. I know the '85 and '93 22re's have identical resistance values. I think the only difference is what the computer is doing with the information.
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Old 12-07-2009, 08:40 PM
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I have an 82 supra afm on my 93 22re 268 cam over sized valves and did not change anything on it just swapped it over with a little modding to fit it in place but nothing done to the guts even left it in the stock position on the wheel/scale and I seem to be getting about 16.5 to 17 mpg and I run it pretty hard to get that, if I run like a normal person I get like 18-19 not much difference but it is still a little better.
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Old 12-08-2009, 05:51 AM
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Good luck, and Nice Fighter, are you on Customfighters? I just sold my last project and got my new project Sold an FZR600 that I did a bit to, picked up a 77 CB550, goign to cafe race it out - unless someone comes along with the right money for it;-)
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Old 12-08-2009, 06:55 AM
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Wrong year for pnp 82/3 I know 82 is pnp and read both yes and no on '83) toyota change the supra afm so the values are reverse of what the 22re reads. I've see where people take the guts out of their 22re afm and put them into later model supra afm

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Old 12-08-2009, 11:29 AM
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Cool

Originally Posted by vandert View Post
Good luck, and Nice Fighter, are you on Customfighters? I just sold my last project and got my new project Sold an FZR600 that I did a bit to, picked up a 77 CB550, goign to cafe race it out - unless someone comes along with the right money for it;-)
naw, im not on customfighters, because its not a streetfighter. thats the only avatar pic i could find. now its a custom rocket! pics of it and my pickup are below
http://www.cardomain.com/id/mojavedude
and good luck with your project, i love having projects!

im searching for a reasonabily priced 86-92 supra AFM. i guess if i find one ill sell the empty 83-85 supra AFM to anyone with early style afm, so if anyones interested, let me know!

in the mean time, im going to play around with spring tension and see if that does anything.
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Old 12-08-2009, 11:47 AM
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check it out majavedude we have similiar bikes and trucks. I've got a custom 2004 kfx400 long travel bored over and hopped up. same one in my avatar but heavily modded since the pic. I think i remember you had an old ksf250 mojave befrore as well right? Nice rocket by the way! As mentioned before you would have to use the afm out of a 82 supra to get the plug and play results. I did the same thing with an 85 afm but didn't plug it in when i realized it wouldn't work without modding the guts from my original 22re afm. I got lucky and found an 82 and plugged it in and worked perfectly. I still have the 85 afm if you want it pm me and we can figure out a price and shipping. Like i said before you can't use the 85 afm without using the guts out of a 22re afm installed in it.
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Old 12-09-2009, 05:20 AM
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Originally Posted by mightymouse View Post
check it out majavedude we have similiar bikes and trucks. I've got a custom 2004 kfx400 long travel bored over and hopped up. same one in my avatar but heavily modded since the pic. I think i remember you had an old ksf250 mojave befrore as well right? Nice rocket by the way! As mentioned before you would have to use the afm out of a 82 supra to get the plug and play results. I did the same thing with an 85 afm but didn't plug it in when i realized it wouldn't work without modding the guts from my original 22re afm. I got lucky and found an 82 and plugged it in and worked perfectly. I still have the 85 afm if you want it pm me and we can figure out a price and shipping. Like i said before you can't use the 85 afm without using the guts out of a 22re afm installed in it.
sweet, yea i ride a slightly modified 2003 kfx400, and i use to ride a ksf250 mojave. hence the name, it was the first "project" i ever worked on and built it into a sweet machine when i was 12. i sold it, and i always want to remember it so i use my origional mojavedude name for all the forums im in.

i ordered an 89 supra vafm (late style) hopefully that fixes the problem. the 85 vafm will only work in toyota pickups with early style vafm. (pre 88 i think?) this also only works if you swap the electronics. i will also have to swap the electronics into my 89 vafm, but they should corrispond better because their the same style (late style)

*avatar updated!

Last edited by mojavedude; 12-09-2009 at 05:27 AM.
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Old 12-09-2009, 01:50 PM
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don't forget, you can plug n play a 82-83 supra afm with no internals swap.
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Old 12-17-2009, 08:41 AM
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so i swaped in a "late model" supra VAFM (with stock 22re circuit board) and it was a direct fit. BUT NOW ITS ONLY GETTING 11MPG?!?!?! Im lost, according to my haynes manual, all resistances are correct! and im drivin this thing like a granny!

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Old 12-17-2009, 09:01 AM
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Originally Posted by LD View Post
don't forget, you can plug n play a 82-83 supra afm with no internals swap.
It's the 22250-44110 (I think those numbers are right) that came in the 1982 Supra.

Originally Posted by mojavedude View Post
so i swaped in a "late model" VAFM and it was a direct fit. BUT NOW ITS ONLY GETTING 11MPG?!?!?! Im lost, according to my haynes manual, all resistances are correct! and im drivin this thing like a granny!
What year model is the VAFM?
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Old 12-17-2009, 09:42 AM
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Originally Posted by Junkers88 View Post
What year model is the VAFM?
its from an 89 supra, identical to the stock 22re vafm execpt taller for more air flow.

82-83 afms are less common/ more $, thats why i didnt go with that one.
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Old 12-17-2009, 10:23 AM
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I don't think the 89 is a direct plug and play unit.
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Old 12-17-2009, 10:32 AM
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Originally Posted by Junkers88 View Post
I don't think the 89 is a direct plug and play unit.
yes i know that, i swapped the circuit board from my 22re afm into the 89 supra afm.
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Old 12-17-2009, 01:25 PM
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Originally Posted by mojavedude View Post
yes i know that, i swapped the circuit board from my 22re afm into the 89 supra afm.
Oh. I must have read that wrong.

So at first you swapped in the circuit board from your factory AFM into an 85 Supra body and then did the same thing with an 89 Supra body. I'm thinking it might be your circuit board since it's the only constant in all this swapping around.
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Old 12-17-2009, 01:48 PM
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X2. I'd try swapping in another known good AFM to confirm.
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Old 12-17-2009, 02:21 PM
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Originally Posted by Junkers88 View Post
Oh. I must have read that wrong.

So at first you swapped in the circuit board from your factory AFM into an 85 Supra body and then did the same thing with an 89 Supra body. I'm thinking it might be your circuit board since it's the only constant in all this swapping around.
i took the negative cable off the battery today, and played with the spring tension, and with a 8 mile long test, it went up 3 mpgs. again it was only 8 miles, so i need to put more miles on to confirm anything.

i will prolly be purchasing a used late model 22re afm if the above doesnt fix it. funny thing is the stock afm was fine before i did anything, and with the stock circuit board in the 89 afm, it passes all the resistance tests in the factory manual. the only thing that seems funny is where the book says " resistance between terminals E2 & Vs will change in wave pattern as measuring plate slowly opens." its not too specific and this may be the problem because my multi-meter just jumps around alot.
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