its prob been answered 100 times before but i didnt find it in a quick search so:
is a compufire ok with a gt40 coil. ??????
thanks anyone...
fetid_swamp Seriously Crusin Dubber
174 posts · joined Sep 2003 ·
gt40 coil & compufire ???
Anthiron The Baja Rejuvenation Begins
4,936 posts · joined Oct 2003 ·
i think i heard somewhere that u would have to use a standard coil as the GT40 gets to hot but i could be wrong. someone else will know
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
Bizarre Moderator The artist formerly known as blue74l
12,789 posts · joined Aug 2002 ·
Hmmm... i cant remember now - but there IS a difference.
When i put my Magfire in it said you wanted a coil with
a) 1 ohm
b) 3.5 ohm
resistance.
Buggered if i can remember which one it was :jesus
When i put my Magfire in it said you wanted a coil with
a) 1 ohm
b) 3.5 ohm
resistance.
Buggered if i can remember which one it was :jesus
Futue te ipsum!!!
fetid_swamp Seriously Crusin Dubber
174 posts · joined Sep 2003 ·
hokay then, another qu.
how many ohms resistance is a gt40 or which terminals do i use to measure its resistance.
do i go across the + & - or do i involve the HV dizzy lead somehow???
how many ohms resistance is a gt40 or which terminals do i use to measure its resistance.
do i go across the + & - or do i involve the HV dizzy lead somehow???
Bizarre Moderator The artist formerly known as blue74l
12,789 posts · joined Aug 2002 ·
straight across the pos and neg
Futue te ipsum!!!
fetid_swamp Seriously Crusin Dubber
174 posts · joined Sep 2003 ·
I will check it & advise. thanx.
fetid_swamp Seriously Crusin Dubber
174 posts · joined Sep 2003 ·
gt40 will be no good.
it says i need a high impedance (resistance) coil of 3-5 ohms not one of 1 or less ohms.
just tested it and the gt40 has a 1 ohm resistance.
so anyone have any ideas on an appropriate replacement??
it says i need a high impedance (resistance) coil of 3-5 ohms not one of 1 or less ohms.
just tested it and the gt40 has a 1 ohm resistance.
so anyone have any ideas on an appropriate replacement??
Bizarre Moderator The artist formerly known as blue74l
12,789 posts · joined Aug 2002 ·
yeah - the BLACK bosch coil
NOT the standard Blue Coil
Once upon a time so,e one posted here that they worcked for Bosch and the different coils were resistance related
Blue - points
Black - electronic
I think the serial is SE 12
NOT the standard Blue Coil
Once upon a time so,e one posted here that they worcked for Bosch and the different coils were resistance related
Blue - points
Black - electronic
I think the serial is SE 12
Futue te ipsum!!!
Bizarre Moderator The artist formerly known as blue74l
12,789 posts · joined Aug 2002 ·
yep - Its a SU 12
Black and is 3.5 ohms
I just measured it
Black and is 3.5 ohms
I just measured it
Futue te ipsum!!!
manx020 Casual Dubber
46 posts · joined Feb 2003 ·
i have been using a 009/compufire combo with a bosch gt40 12volt coil for years with no problems.
cheers,
rick
cheers,
rick
fetid_swamp Seriously Crusin Dubber
174 posts · joined Sep 2003 ·
thanks all.
i think i will still get a high resistance coil in my next order from a forum sponser as it's better safe than sorry and i can keep the gt40 with the points and condenser in the spares kit to cover any electrical fry action far from home.
[Edited on 5-10-2004 by fetid_swamp]
i think i will still get a high resistance coil in my next order from a forum sponser as it's better safe than sorry and i can keep the gt40 with the points and condenser in the spares kit to cover any electrical fry action far from home.
[Edited on 5-10-2004 by fetid_swamp]
Baja Wes V6 Baja Pioneer
3,119 posts · joined Aug 2002 ·
I had a compufire equivalent (magnafire?). First I ran it with a GT40R, but it overheated after 20min of driving and stopped. was ok once cooled down. The GT40R is meant for cars with a ballast resistor.
I then went to a GT40. Never had a problem since then. (eventually sold that motor).
I then went to a GT40. Never had a problem since then. (eventually sold that motor).
Wes - www.offroadvw.net - 200HP Quad Cam V6 in a VW Baja - with climate control... 🙂
www.taylorcycles.com.au - My DH MTB racing brothers shop.
www.taylorcycles.com.au - My DH MTB racing brothers shop.
68AutoBug Beetle Restorer - Experience over 138\% - YIKES --
11,654 posts · joined Aug 2002 ·
A Sports coil such as the GT40 - draw substantially More current than a standard ignition coil...
to obtain their higher output voltage.. which can result in overheating...
It may depend on where the coil is situated , such as under a closed engine lid [without vents]
... or under a late model engine lid with vents - or open at top etc.. or Baja...
Lee
[Edited on 6-10-2004 by 68AutoBug]
to obtain their higher output voltage.. which can result in overheating...
It may depend on where the coil is situated , such as under a closed engine lid [without vents]
... or under a late model engine lid with vents - or open at top etc.. or Baja...
Lee
[Edited on 6-10-2004 by 68AutoBug]
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---
fetid_swamp Seriously Crusin Dubber
174 posts · joined Sep 2003 ·
mnsKmobi Wolfsburg Wizard
589 posts · joined Aug 2002 ·
What do you want to know? Removing the resistor in the rotor is supposed to be required if you have a high output ignition such as a CDI. Otherwise the resistor overheats and stops conducting.
Anthiron The Baja Rejuvenation Begins
4,936 posts · joined Oct 2003 ·
can you not just buy a rotor with a bigger resistor? you would think they would manufacture something if this was a standard problem.
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
fetid_swamp Seriously Crusin Dubber
174 posts · joined Sep 2003 ·
------------------------------------------------------------------------------mnsKmobi wrote:What do you want to know? Removing the resistor in the rotor is supposed to be required if you have a high output ignition such as a CDI. Otherwise the resistor overheats and stops conducting.
cool. so the resistor in the rotor is not something we need to worry about if only going to a compufire and not a full blown CDI system.
Thanks
thanks
68AutoBug Beetle Restorer - Experience over 138\% - YIKES --
11,654 posts · joined Aug 2002 ·
Good job,
that rotor won't burn out...
I did buy a new rotor without the resistor from the US..
Was more than double the price of the original VW rotor..
Everyone should carry one of these for a spare...
especially if You have a High Energy electronic ignition system..
Lee
that rotor won't burn out...
I did buy a new rotor without the resistor from the US..
Was more than double the price of the original VW rotor..
Everyone should carry one of these for a spare...
especially if You have a High Energy electronic ignition system..
Lee
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---
68AutoBug Beetle Restorer - Experience over 138\% - YIKES --
11,654 posts · joined Aug 2002 ·
A local had one burn out a few months ago...
Had to be towed home....
His father found the problem...
The rotor burnt out while being driven...
so, it can happen....
PS. I do believe there is a replacement rotor from a different car that does fit the Air Cooled VWs distributors...
with NO resistor....
Lee
Had to be towed home....
His father found the problem...
The rotor burnt out while being driven...
so, it can happen....
PS. I do believe there is a replacement rotor from a different car that does fit the Air Cooled VWs distributors...
with NO resistor....
Lee
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---
Grey 57 Old Grey Cruiser
2,937 posts · joined Aug 2002 ·
I fitted a compufire unit into my old oval fitted with 1600 SP. The standard Bosch Black coil died in a very short time. It has to do with the duration of dwell. Perfect with a hall cell. I.e. the points (hall cell) are on (closed) a longer time between opening. This cased the standard coil to over heat.
Changed to a Bosch electronic coil (non ballast resist) and had no more problems.
The Compufire unit is money well spent on a VW engine. Starts faster, idles smoother, dunno about extra power never checked it on a dyno. Saves pissing about with points every 3000ks too.
[Edited on 8-10-2004 by Grey 57]
Changed to a Bosch electronic coil (non ballast resist) and had no more problems.
The Compufire unit is money well spent on a VW engine. Starts faster, idles smoother, dunno about extra power never checked it on a dyno. Saves pissing about with points every 3000ks too.
[Edited on 8-10-2004 by Grey 57]