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Location:
Brisbane
Registered:
April 2003
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1ggte ballast resistor?
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Mon, 02 June 2003 09:01
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Hi, I've been talking to Craig (ddeane) about the 1ggte and he mentioned it may require a ballast resistor for the injectors to keep the voltage down. Can anyone confirm that a generation 3 also requires a ballast resistor as I've been looking at the wiring diagrams and fail to see one.
Any help is appreciated...
Cheers Kirk
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Location:
Brisbane
Registered:
April 2003
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Re: 1ggte ballast resistor?
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Mon, 02 June 2003 12:06
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Does anyone here own a gen 3 or done a gen 3 conversion before?
Just curious, because I know alot of members on here have 1ggte's and would just like to know what generation everyone is running?
Kirk
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Location:
Cabramatta, NSW
Registered:
May 2002
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 Re: 1ggte ballast resistor?
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Mon, 02 June 2003 12:59
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Me. 
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Registered:
June 2002
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Re: 1ggte ballast resistor?
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Mon, 02 June 2003 13:09
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im running a gen3
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Location:
Brisbane
Registered:
April 2003
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Re: 1ggte ballast resistor?
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Mon, 02 June 2003 13:27
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So does anyone know anything about the ballast resistor?
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Location:
Cabramatta, NSW
Registered:
May 2002
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 Re: 1ggte ballast resistor?
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Tue, 03 June 2003 00:07
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I'm pretty damn sure we didn't use one. Mos would know for sure since he did the wiring for the car.
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Location:
Brisbane
Registered:
April 2003
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Re: 1ggte ballast resistor?
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Tue, 03 June 2003 00:15
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Thanks Nark... 
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Location:
Brisbane
Registered:
February 2003
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Re: 1ggte ballast resistor?
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Tue, 03 June 2003 14:15
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i have what appears to be a gen 1 1G-GTE - yellow ECU plugs & injectors - in the yellow wreck in the garage.
colour-of-plugs assumption based on the technote here:
http://www.toymods.org.au/1g_versions.html
Also, the hoods on the injec connectors are brown & grey.
however, the ECU's label only has '1G-GT" on it ??
It has large ballast resister for injectors under the bonnet - has three wires: presumably one for each bank of injectors and the third going to ground, tho it rejoins the wiring loom before doing so. i would think that without it, the injectors will pull too much juice and you'll either fry the driver circuits in the ECU or the injec's will pop.
having said that, the other wiring diagram i have shows no ballast resister - so maybe gen 3 used different (hi impedance) injecs?
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Location:
PNG
Registered:
June 2002
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Re: 1ggte ballast resistor?
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Tue, 03 June 2003 22:09
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Kirk
The wiring diagram on this site is for a gen 3 1ggte. It obviously has a ballast resistor. To check for your particular engine, confirm the impedance of the injectors - if the are 2.8 ohms you will need the resister if they are 13 or so ohms you will not. Once you have done that drop me a line and I will check the resistance of the ballast resistor on my car and let you know - you can then do a check of injected toyotas at the wreckers or obtain a high wattage resistor from an auto electrician or Jaycar (as I did with my 2tge)
Craig
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Location:
Brisbane
Registered:
April 2003
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Re: 1ggte ballast resistor?
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Tue, 03 June 2003 23:38
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Thanks Charles that was the conclusion I had come to along wih my father. But I will be checking the impedence non the less just to make sure.
Thanks Craig, can you show me where abouts on the wiring diagram it shows the ballast resistor? I can see the injectors running from the ignition switch and then off to the ecu but no mention of the resistor... As I havn't been reading wiring diagrams for too long maybe there is something I am missing completely? 
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Location:
Brisbane
Registered:
February 2003
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Re: 1ggte ballast resistor?
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Wed, 04 June 2003 14:31
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hi Kirk/craig,
after reading craig's message i wondered if perhaps the ballast probably goes between the the power source (ign switch) and the injectors?
i've got a diagram at home but there's no 'obvious' ballast in that circuit - unless it's a connector in disguise?
it's this 6 page diagram i snaffled and converted to PDF:
http://members.optushome.com.au/mkhala/red_celica/ 1G-GTE_info/1g_gte_ecu_wiring.pdf
... back to the point.. because ... it appears that the ECU is switching the injectors to ground or leaving them open circuit - so if most of the current dump is prior to the ECU (e.g. at the ballast) it doesn't have to handle/disperse large transients or spikes when switching. i think?
ta, charles.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 1ggte ballast resistor?
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Wed, 04 June 2003 15:23
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from what i understand of efi (From the MS list), the ballast resistor is there to limit current to the injectors. there was much talk of this as the MS can run PWM or full current. do the toyota ECU's run PWM?
anyhoo, it shouldn't matter that much if it is before or after the injectors as they are ther to limit current, but between the power source and injectors is 'normal'
yes, the ECU switches the injector power to ground, and is open circuit otherwise.
for high impedance injectors (say 14ohms) each injector pulls 1amp, so the ECU is switching 6amps total.
with lowZ injectors (say 3ohms) the ballast resistance depends if there is 1 or 2 switching circuits in the ECU (how many banks folks?) if they are on one bank in parallel, (and are 3ohms) then injec resis is 0.75 ohms so ballast is around 12-14 homs. wattage is around 70W total for 1A draw on each injector..
as for spikes, there is a large amount of flyback when the injector closes, causing very short sharp voltage spikes, but factory ECU's are designed to tolerate this.
funny that manufacturers use low Z injectors, which are in theory so you can have full current for fast opening and then PWM for less power comsumption and then faster closing.... and they go and put ballast in front of them... hmmmmm
Cya, Stewart
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Location:
PNG
Registered:
June 2002
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Re: 1ggte ballast resistor?
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Wed, 04 June 2003 22:16
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Kirk
Gulp - removes foot from mouth. I did have a proper look at the wiring diagram for the gen 3 and it looks like it must use high impedance injectors - as there is NO ballast resister. The Gen 2 definitely does.
Craig
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Location:
Brisbane
Registered:
April 2003
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I can't imagine it tastes that good.