AFM replacment options

Sonyps307 · 01-24-2013, 11:23 PM

I was think about going with the hks vpc but this converter looks like it will be easier to set up.

pandrade · 01-29-2013, 08:29 PM

recently iv come into a lower supra budget, would it be better to just have it tuned at a dyno shop like you said or should i save a little more and buy a wideband(i have no experiance tuneing so i think i should go to my local reputable tuner)

cre · 01-30-2013, 06:46 PM

It may not need any tweaking at all. What you want to do is to get a wideband reading at cold idle and while at WOT. As you'll be leaving the rest of the stock system in tack the ECU will be able to adjust for any other offset. The adjustments are just minor trims to the fueling. I don't think any one dial is capable of 10% (possibly not even that much). The high load trim is probably the only one which will need adjustment. Paying for a full tuning session would be a waste. If you know anyone at the shop all you really need is to do two or three WOT pulls on the dyno. After each one tweak the high load trim dial a little and you should have it spot on by/after the third run. If you're still uncomfortable then by all means pay a shop to do it... It shouldn't cost much given how little this needs to be adjusted and you'll already have it installed.

pandrade · 01-31-2013, 03:31 PM

well thanks for your insght cre, out of curiosity is a bad afm something common in the 7m gte or (im assumeing) age and mileage like any other part

cre · 01-31-2013, 11:53 PM

The 7M-GTE's KVAFM isn't a "wear component" per se but they use a very sensitive optical sensor and are VERY delicate. There are a number of factors which contribute to their demise including improper handling and/or servicing and fogging of the optics.

The 7M-GE's VAFM IS a "wear component" and should be replaced about as often as the TPS which uses the same type of internal mechanisms to generate it's signal. How often these components may need to be replaced will depend on how the vehicle is driven and how varied the operating conditions are. From what I've seen personally they're almost always out of spec by the time the timing belt is changed. The TPS on the GTE isn't an exception to this.

01-29-2013, 08:29 PM	#2
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	recently iv come into a lower supra budget, would it be better to just have it tuned at a dyno shop like you said or should i save a little more and buy a wideband(i have no experiance tuneing so i think i should go to my local reputable tuner) __________________ 1987 7m-gte R-154, SS braided clutch line, full 3in exshaust,aluminum radiator,full throttle gen 2 whith GM 3 inch mass air flow,13lbs flywheel, and more to come

01-30-2013, 06:46 PM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	It may not need any tweaking at all. What you want to do is to get a wideband reading at cold idle and while at WOT. As you'll be leaving the rest of the stock system in tack the ECU will be able to adjust for any other offset. The adjustments are just minor trims to the fueling. I don't think any one dial is capable of 10% (possibly not even that much). The high load trim is probably the only one which will need adjustment. Paying for a full tuning session would be a waste. If you know anyone at the shop all you really need is to do two or three WOT pulls on the dyno. After each one tweak the high load trim dial a little and you should have it spot on by/after the third run. If you're still uncomfortable then by all means pay a shop to do it... It shouldn't cost much given how little this needs to be adjusted and you'll already have it installed. __________________ 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 --->

01-31-2013, 03:31 PM	#4
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	well thanks for your insght cre, out of curiosity is a bad afm something common in the 7m gte or (im assumeing) age and mileage like any other part __________________ 1987 7m-gte R-154, SS braided clutch line, full 3in exshaust,aluminum radiator,full throttle gen 2 whith GM 3 inch mass air flow,13lbs flywheel, and more to come

01-31-2013, 11:53 PM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The 7M-GTE's KVAFM isn't a "wear component" per se but they use a very sensitive optical sensor and are VERY delicate. There are a number of factors which contribute to their demise including improper handling and/or servicing and fogging of the optics. The 7M-GE's VAFM IS a "wear component" and should be replaced about as often as the TPS which uses the same type of internal mechanisms to generate it's signal. How often these components may need to be replaced will depend on how the vehicle is driven and how varied the operating conditions are. From what I've seen personally they're almost always out of spec by the time the timing belt is changed. The TPS on the GTE isn't an exception to this. __________________ 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 --->

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01-24-2013, 11:23 PM	#1
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	I was think about going with the hks vpc but this converter looks like it will be easier to set up.