 DIY Active Map Clamp, How To make your own Active Map Clamp (Gen 3 3SGTE) |
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 Oct 5, 2010 - 2:29 PM
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 Enthusiast  Joined Dec 19, '07 From tx Currently Offline Reputation: 22 (100%)  |
 I knew calling Stephen into this would be a quick easy fix
--------------------  ENGINE: '93 RC 3S-GTE/WRC CT-20b [18-20PSI] PERF: TRD/HKS/ARP/NGK/MSD/ACT/Blitz/STRI/APEX'i/TwosRus/GReddy/Magnaflo/KOYO SUSP: Tein/Bilstein/SusTech/ INT: SS-III SEATS/Toyota Hyper Sports EXT: WRC/TRD/404 QUOTE (lagos @ Aug 25, 2010 - 10:13 AM)  Its a safety feature so that people like you don't end up killing themselves or everyone around them. Slow down Paul Walker. 6GC Chat - Go there: [url="http://www.griffgirl.com/forum/chat/index.php[/url] |
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Oct 6, 2010 - 7:16 AM
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 Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
QUOTE EDIT: whoa, whoa, wait. the original design is NOT A CLAP AT ALL. actually, it is basically just a FCD. lowering the voltage somewhat is ALL ranges of map operation. Thats true. We are doing some basic electronics work in engineering class with resistors and diodes, and all this setup is is just a variable resistor (the pot) with a diode that only allows current to flow one way. This will reduce voltage for all values that the ecu sees, similar to a basic fcd. -------------------- 15PSI - 30MPG - Megasquirt Tuned
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Oct 6, 2010 - 8:56 AM
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 Enthusiast Joined Mar 22, '07 From Houston, TX Currently Offline Reputation: 4 (100%) |
Right. but replace those diodes with zener type 4.9v or lower and you will be set. The voltage diode you select will not pass any current(clamp) under the selected voltage. so if you chose a 5.1v diode, the map operation will be unaffected at all.
BTW, if this doesn't work out for you, I can design a circuit that will work better/be cleaner. -------------------- QUOTE "And, as always, your friendship, help, and dedication to the advancement of Texas Celica dominance is GREATLY appreciated. Thanks bro." -DEATH 1994 GT: V6 swap, 5speed E53 W/ LSD, All Power, now RED 1995 ST: SOLD @273k miles, Auto, all power, CarPC, White 1994 ST: Totaled, 5spd, all power, Red RIP 07/09/09 @ 241,810 1994 Lexus LS400: This is my new DD |
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Oct 6, 2010 - 11:15 AM
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Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
QUOTE (stephen_lee @ Oct 6, 2010 - 9:56 AM) Right. but replace those diodes with zener type 4.9v or lower and you will be set. The voltage diode you select will not pass any current(clamp) under the selected voltage. so if you chose a 5.1v diode, the map operation will be unaffected at all. BTW, if this doesn't work out for you, I can design a circuit that will work better/be cleaner. So they sell zener diodes in different voltage ratings? This means that all you would need is the diode to be wired in right before the ecu and the pot is not needed. -------------------- 15PSI - 30MPG - Megasquirt Tuned
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Oct 6, 2010 - 4:17 PM
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Enthusiast Joined Mar 22, '07 From Houston, TX Currently Offline Reputation: 4 (100%) |
Right. But the pot IS needed for adjustability.
-------------------- QUOTE "And, as always, your friendship, help, and dedication to the advancement of Texas Celica dominance is GREATLY appreciated. Thanks bro." -DEATH 1994 GT: V6 swap, 5speed E53 W/ LSD, All Power, now RED 1995 ST: SOLD @273k miles, Auto, all power, CarPC, White 1994 ST: Totaled, 5spd, all power, Red RIP 07/09/09 @ 241,810 1994 Lexus LS400: This is my new DD |
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