Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra > MKIII FAQ

Reply
 
Thread Tools Display Modes
Old 02-16-2012, 04:09 AM   #1
2genfun
3" Exhaust
 
Join Date: Feb 2010
Location: Orlando, FL
Posts: 65
2genfun is on a distinguished road
Default Lexus AFM

quick question...my turbo mk3 was running fine, completely stock. i put a lexus afm on it and now it breaks up while driving normal, and seems to have a hard time idling.
__________________
88 targa. H&R springs, koni adustable shocks, 18" wheels, d&s rotors, goodrich brake lines, 7mgte in progress...
2genfun is offline   Reply With Quote
Old 02-16-2012, 05:36 AM   #2
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,036
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

You upgraded the injectors or added 25% more fuel some other way I hope... Can't run more air until you've got more fuel or you're going to run lean and destroy stuff VERY quickly.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 02-16-2012, 01:37 PM   #3
Green7mgte
Supra Forum Moderator
 
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
Green7mgte is on a distinguished road
Default

are you talking housing or black box? if you replaced your stock metal honeycomb then yes, your going to ruin you engine unless you have a way of tuning. The black box used as a replacement for your kvafm (i.e my old one busted.) is acceptable and should not affect your daily driving. granted you wired it in correctly..
__________________

92 Ma71 7mGTE Auto. SafcII
Supra FAQ
Supra MKIII FAQ
Classified Section guidelines :


Last edited by Green7mgte; 02-16-2012 at 01:40 PM.
Green7mgte is offline   Reply With Quote
Old 02-16-2012, 04:03 PM   #4
pandrade
12psi boost
 
Join Date: Mar 2011
Location: fort myers florida
Posts: 345
pandrade is on a distinguished road
Default

from what i have heard if you put the lexus afm you can also take its injectors which already flow 550cc which both will plug and play( i would get them flow tested first, dont want a bad injector)if you dont have the injectors you'll start damaging things really quick
pandrade is offline   Reply With Quote
Old 02-16-2012, 05:28 PM   #5
Green7mgte
Supra Forum Moderator
 
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
Green7mgte is on a distinguished road
Default

If the lex are low impedance. I don't think they are if I recall correctly
That's something I'd check into.
__________________

92 Ma71 7mGTE Auto. SafcII
Supra FAQ
Supra MKIII FAQ
Classified Section guidelines :

Green7mgte is offline   Reply With Quote
Old 02-16-2012, 08:49 PM   #6
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,036
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

The stock 1UZ injectors flow around 250cc/min.... NOWHERE near what even the 7M-GE's injectors flow. The 1UZ also uses high impedance/'saturated' injectors where the 7M-GTE uses low impedance/'peak and hold'. Actually, the 7M-GE's '89+ injectors are an upgrade for the 1UZ; '89+ GE injectors (with the green top) are high impedance.

The ELECTRONICS within the 7M-GTE and 1UZ-FE KVAFM are the SAME and may be interchanged.

The HOUSING of the two KVAFMs are different. The 1UZ's flows about 25% more unmetered air. As this air is unmetered and the ECU has no way of knowing that it needs to provide additional fuel to match the airflow.... Hence the REQUIREMENT for larger injectors; It's not an option.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 02-17-2012, 12:33 AM   #7
Green7mgte
Supra Forum Moderator
 
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
Green7mgte is on a distinguished road
Default

I thought they were high impedance. I was at work tho posting from my iphone.

can you make that a sticky please. or move to the faq.
__________________

92 Ma71 7mGTE Auto. SafcII
Supra FAQ
Supra MKIII FAQ
Classified Section guidelines :


Last edited by Green7mgte; 02-17-2012 at 12:38 AM.
Green7mgte is offline   Reply With Quote
Old 02-17-2012, 01:12 AM   #8
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,036
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

Quote:
Originally Posted by Green7mgte View Post
I thought they were high impedance. I was at work tho posting from my iphone.
You thought correctly... they are. You can use high impedance injectors on an engine which came with low by removing the resistor pack but you cannot run high impedance injectors with an ECU that's built for low (at least not without a good amount of work... often including a different ECU ).

Quote:
Originally Posted by Green7mgte View Post
can you make that a sticky please. or move to the faq.
I'll move it to the FAQ for now. I may put together a more concise thread without all the additional chatter in its place later on. I didn't realize that this upgrade wasn't even covered in the FAQ.
cre is offline   Reply With Quote
Old 02-17-2012, 01:15 AM   #9
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,036
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

Ok. I've moved it to the FAQ. Everyone keep in mind that if you reply to this thread now it is moderated so your post won't show up until a staff member approves your post.

We haven't heard back from 2genfun.... Are we to assume he's busy swearing while pondering the easiest way to replace a piston with 'speed holes'?
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 02-17-2012, 02:05 AM   #10
Green7mgte
Supra Forum Moderator
 
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
Green7mgte is on a distinguished road
Default

that explanation you gave, covered that question most thoroughly. It deserved a spot in the faq. Rather then repeatedly spouting it. Cheers!
__________________

92 Ma71 7mGTE Auto. SafcII
Supra FAQ
Supra MKIII FAQ
Classified Section guidelines :

Green7mgte is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lexus AFM Questions Chromemoly MKIII Supra 0 07-05-2009 03:55 AM
HELP PLEASE Nick0887 Non-Generation Specific Questions 4 02-28-2009 07:26 AM
Lexus or Toyota AFM. What is the diference? azerty MKIII Supra 4 04-30-2008 02:08 PM
Diferences between Lexus and Toyota AFM azerty Non-Generation Specific Questions 1 04-29-2008 08:56 PM
Lexus AFM question? rnoswal MKIII Supra 13 04-20-2006 07:34 AM


All times are GMT. The time now is 11:41 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86