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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Fuel Cut Defender
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Sat, 12 June 2004 15:59
 
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Heres a circuit to "calibrate" your AFM
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Fuel Cut Defender
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Sat, 12 June 2004 16:02
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Heres one to trick your ECU into enriching your fuel mixture.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: DIY Fuel Cut Defender
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Sat, 12 June 2004 16:23
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clipping MAP signal is dangerous.
instead of the ECU detecting excessive boost and cutting fuel, you 'clip' the MAP signal, so that the ECU doesn't know you've increased boost, and you lean out the motor and it blows up 
oops 
intake air temp could be useful...
but coolant temp one can be bad if the ECU thinks motor is still in 'warm up mode'
interesting tho.
meh, YMMV
Cya, Stewart
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sat, 12 June 2004 16:41
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I was looking for details on how to stop the GT4 from limiting boost in first and second gears when I stumbled upon these...
If you use the coolant sensor circuit but put the pot in parallel with the sensor you could have change the temperature at which your ecu decides to retard things
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Location:
Lost in the K hole
Registered:
May 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sat, 12 June 2004 16:46
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in my experience:
- modifying the coolant temp with a pot results in shitful economy and no gain in power or drivability.
- toyota AFMs dont demonstrate a simple linear curve output. rather it is a cyclic step function and whacking a pot into that circuit does sweet fuck all
- changes to the air temp sensor make almost immesurable change to engine operating parameters.
ive not played with MAP sensors so i dont know about those ones 
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sat, 12 June 2004 17:10
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and the lord knows Ed tried
Toobs, why does it limit boost in 1st and 2nd (and isn't that a good thing?)
if there is a gear switch, why not deactivate it instead?
agreed, if you knew how much the ECU retards timing based on temp, it may be useful, but as ed said, the fueling change is not usually huge...
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sat, 12 June 2004 17:15
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In the gtfour you can feel the ecu retarding things when the temperature is high (not the cars temp.. the intake air temp) I think it could prove useful to be able to alter these things.
I don't know how the first and second gear boost limit thing works... theres no gear switch... i originally thought it was just because there wasn't so much load on the engine in the lower gears but after a bit of reading it appears to be ecu controlled...
Classique claims to have had the limit removed on his beast but it was done before he bought the car so he doesn't know how it works... at least that was the response last time I asked / heard.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sat, 12 June 2004 17:29
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instead of tricking the ecu, why not try and actually make the intake temps cooler? CAI?
also improve the cooling system and keep the head as cold as possible. keep those chamber temps down
id reckon the reason the ecu would be pulling timing when the intake temp rises is most likely that its detecting detontation. comb pressure/temp is just creeping up enough to tilt things over the limit?
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 00:24
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If it was because of detonation I would understand but the gtfour ecu does some funny stuff at times...
e.g. stops the w/a ic pump from running whilst the vehicles stationary.
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Location:
newcastle
Registered:
June 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 00:25
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The map circuit works fine on both 1j and 3sgte , i have fitted to both .
you are not modifying the entire map signal only clipping it .
most of the time factory ecu maps dont go beyond the boost cut limit anyway so they are going to run rich anyway .
this is what happens on both of these engines
the thing to remember is the setup is important. try small adjustments to the pot and keep hitting boost cut then adjust a little more. as soon as you no longer cut then lock the pot with locktight or glue or whatever and leave it alone
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 00:47
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Probably best to have a fuel mixture meter in the car if you're going to mess with the map sensor... god knows you don't want your car to run lean and burn the sh!t out of valves etc.
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Location:
Sydney
Registered:
July 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 00:57
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HKS, APEXI and many other big japanese brands spens hundreds of thousands of dollars perfecting these units, I'd prefer to pay the extra, to get one that I know does the right thing, is made for a specific purpose, has a warranty, made by HKS or APEXi, and usually comes with a pretty digital screen or flashing lights to let me know what is going on......
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 01:11
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Have you ever cracked open a brand name FCD?
I wouldn't be surprised if they are pretty much the same circuit but with some pretty flashing leds.
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Location:
Sydney
Registered:
July 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 01:20
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yeah, a fcd is basicaly nothing but a few circuits....
but it is tried and tested, and garanteed not to fry your engine.
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 01:26
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Hmm... do they actually guarantee that the product will not kill your engine (or assist you in doing so)?
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Location:
Sydney
Registered:
July 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 01:40
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it was made for a specific purpose.
I am only saying my opinion. I am not saying you have to agree, all I am sayiong is if you want an Air/Fuel controller, that you can control every 50prm through your whole rev range, use an Apexi SAFC II. I prefer to be able to know what my revs. air and fuel are doing, instead of just guessing.
As with the FCD, look at a HKS one, (as shown below) you ADJUST your boost cut, so you can run your desired boost, but it CANT SPIKE more than you let it. The HKS FCD DOES NOT REMOVE the fuel cut, it simply MOVES IT HIGHER. As with my last Supra, I used a HKS FCD to move the boost cut level to 17psi. That way i could run 15psi safely, and it would still make sure I could not go over 17psi.
moving the boost cut to another position just above your set boost level is good, it isnt just removed. so in the event of boost controller failure (or a mate playing with it) you wont run 55psi till your engine shits itself.
I'd prefer to pay the money, and do it properly 
[Updated on: Sun, 13 June 2004 01:40]
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 02:31
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The one in the circuit shown does not remove the limit entirely... it just moves it up and is variable by the trimpot.
I agree that a proper AFC would be far better than an FCD but then if you're going to spend hundred of dollars on an AFC why not save up a little more and get a proper programmable ECU.
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 02:32
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Crack the HKS FCD open and let see whats going on in there... you know you want to!!!
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Location:
Sydney
Registered:
November 2003
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 03:17
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for anyone who wants to know, those circuits are from "21st century performance" a very very good book.
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 13 June 2004 03:24
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Any book stores or libraries you know of that have this book???
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Location:
Sydney
Registered:
November 2003
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 01:00
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all good motor book stores should have it... will set you back $70
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 11:35
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Regarding your interest in removing the boost limiting in 1st and 2nd gear. Its a matter of removing the turbo VSV vacuum line.
On the wastegate of the turbo, there is 2 vacuum lines, one is the feedback from the compressor side, and the other disappears into the engine conenected to the vsv control device. By pulling and plugging the vaccum line that runs to the vsv controller, you will then have full boost in all gears. Easy huh.
Linky for you:
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 11:42
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You're a legend lance!
I new I had seen something on Alltrac but they re-arranged the website a while ago and half of the good tech docs have disappeared (read: I can't find them)
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 11:44
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Glad to be of service. Thats what you get when you study an engine for too long before you actually get the car. I am planning to buy a GT4, and knowing as much about the car before i get it helps.
BTW. on the alltrac site, its under easy mods.
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 11:45
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Also, the easiest way to get to the valve is from under the car. Requires less crap to be removed. Or unless you have the turbo out already.
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 12:30
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It doesn't look too hard... just have to remove the afm and associated pipework
You don't happen to know where the 14v fuel pump mod is do you???
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 12:40
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i havn't found it since the site reshuffle, As far as i know, its just putting a different sized resistor from the signal so its on all the time. Other then that im not sure, U'de have to ask classique
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 12:48
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Hmmm... yes I keep forgeting about Classique down there in lower downunder.
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Tue, 15 June 2004 22:50
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Also noticed taht you would like to run your wta pump all the time. Its just a matter of grounding one of the pins on the pump. It'll bypass the control circuitry, and will run all the time whilst the car is running.
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Wed, 16 June 2004 01:06
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I don't really have too much of a problem with heat soak... I'm running approx 14-15psi but it stays pretty cool most of the time... cold enough to touch anyway
I just cut the under bonnet insulation for the vents so that they can let the air in and out and everythings sweet!
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Wed, 16 June 2004 02:53
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| Toobs wrote on Wed, 16 June 2004 11:06 |
I don't really have too much of a problem with heat soak... I'm running approx 14-15psi but it stays pretty cool most of the time... cold enough to touch anyway
I just cut the under bonnet insulation for the vents so that they can let the air in and out and everythings sweet!
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More cooling is always welcomed though.
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Location:
South Australia
Registered:
July 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Wed, 16 June 2004 03:31
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I would rather get to the VSV than block off the hose - or better yet, just grab a whole new aftermarket programmable ECU instead of dicking around with the toyota one (I should see my shrink about my toyota ECU issues)
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Wed, 16 June 2004 03:37
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| FWDboy wrote on Wed, 16 June 2004 13:31 |
I would rather get to the VSV than block off the hose - or better yet, just grab a whole new aftermarket programmable ECU instead of dicking around with the toyota one (I should see my shrink about my toyota ECU issues)
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This is true. But for the cost of buying 2 vaccum caps to block off the ends. Its cost affective. And doesn't affect operation at all. Just takes away boost control from the ecu. So be careful when boosting when its really hot. The VSV also serves as a boost limiter in some instances.
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Location:
South Australia
Registered:
July 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Wed, 16 June 2004 03:50
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True - but I feel that usually a manufacturer does things for a reason (ie to keep the engine alive) and you either have to know your stuff or pay someone else who knows their stuff alot of cash to get things 'done right' (ie better than factory).
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Wed, 16 June 2004 06:19
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I think you'll find most of the time they are trying to make it more difficult for customers to break things via stupidity
(e.g. boosting to the point of detonation)
Therefore they put these things in place as an overly cautious way to minimise bad warranty claims
Apparently the reason they made the W/A IC switch off during idle was to minimise the running time of the IC pump thus increasing reliability...
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Location:
New Zealand
Registered:
May 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 20 June 2004 00:35
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cool.
Water temp will enrich accell as well.. and if doing it to a high level, it will splutter.
Get an EMX or Megasquirt.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: DIY Circuits.. FCD, Fuel Enrichment, Timing retard (or retard defender), AFM calibration
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Sun, 20 June 2004 03:19
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i should have checked in earlier ..
This is the thread showing all thats been done to my Gt4 re fuel pump mod .. ( and also a bonus CAI how to )
Mine may vary from others tested , so double check the faq's if you can find them!
http://forums.toymods.org.au/index.php?t=msg&t h=25997&rid=133&S=65be9cfe0fafae18311260d4 21c8ee97&pl_view=&start=0#msg_225392
Simple huh ?
Re VSV bloccking off - after reading this i has a bit of a peek , seems like this was done to mine ( now i know what im looking for )
She'll boost to around 14 PSI in all gears without drama ..
Only side effect seems to be the black fuel rich cloud she blows out under load
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