spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Sept 20, 2020 20:31:05 GMT
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Hi All, my MG is slowly getting some miles on it, but it currently has a stock distributor which is showing it's age (misfiring when hot, a concerning cutting out for a few seconds sometimes) - I've checked fueling etc, and some googling shows this is probably an ignition issue somewhere, so I thought this would be an opportune time to go tech and get a megajolt setup from the likes or Trigger-Wheels. But, I simply cannot find anywhere that tells me where I'd fit the MAP sensor. I assume it's in the instructions, but I'd like to know upfront too. I'm using some HIF carb I got off ebay, with another ebay manifold, all on an A series originally from a Marina. The dizzy has no vac advance, so nothing connected to the carb. So, should I tap the manifold somewhere, or can I use a plate like this: www.minispares.com/product/Classic/MFA446.aspxThe electrics are no bother, but i'd like to be prepared on the vac side cheers
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Sept 21, 2020 11:23:34 GMT
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Yes if there is no tapping on the manifold or on the carb downstream of the throttle plate you will need to either tap the manifold or use the sandwich plate you list above.
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Sept 21, 2020 14:48:26 GMT
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nice one, cheers
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Sept 21, 2020 17:29:38 GMT
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to add, i think the megajolt is really old stuff now, and you can get something like the speeduino seafox to run it for probably less money, and if you ever decide to go on injection etc, itll just do it.
Speeduino is like £150+ an arduino mega.
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Sept 21, 2020 19:14:12 GMT
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interesting, i'll look into it, got a few retro computer arduino projects here already, so programming won't be a problem.
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Sept 21, 2020 19:20:27 GMT
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Sept 21, 2020 19:49:26 GMT
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yeah, reading the guides makes it look quite promising, it also being a maintained project with updates is a real winner too. Time to price up what I'll need
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Midas
Part of things
Posts: 505
Club RR Member Number: 14
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Sept 21, 2020 19:55:15 GMT
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As said, use the plate for your vac take off. I had problems with mega jolt on an a series using the vac port built into the carb.
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Sept 21, 2020 19:58:56 GMT
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yes, well, I'm planning on doing the same to my mini 1000 engine, i was thinking of using the spi unit also, but i think by the time ive bought that and messed about with pumps pipes etc, itll add £200-300 onto the price. So I'm thinking of using the speeduino, ford coil pack which i can hide on the mini under the dirt shield, crank sensor, map sensor, tps, and i think itll drive really well.
I have a bmw e36 compact with a volvo b230 engine in it, that is on injection, but i use the micro squirt on that, its really good, and uses the same tuner studio, so I'm not scared to get this to work.
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Sept 21, 2020 20:00:11 GMT
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As said, use the plate for your vac take off. I had problems with mega jolt on an a series using the vac port built into the carb.
was it pulsing? i hear you can put a fuel filter inline to smooth it out? but only heard that
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ChasR
RR Helper
motivation
Posts: 10,188
Club RR Member Number: 170
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Sept 23, 2020 18:28:03 GMT
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I know it's pricier than a few of the solutions there, but I'd consider a 123 Dizzy.
The fully remappable ones are superb. I had decent results on my 2CV and a mate managed to get superb results with one on his XJS 4.0.
All of the dizzy setups mentioned here however take a full vacuum source after the carb. So tapping anywhere into the vacuum source on the inlet manifold will be fine.
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Sept 23, 2020 18:37:05 GMT
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if you are fitting the A+ spi unit to an A series it is not too difficult to fit the SPI electronic distributor as well, I have one on our Minor which works really well.
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Last Edit: Sept 23, 2020 18:37:22 GMT by kevins
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Sept 23, 2020 18:50:20 GMT
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Isn't there a vac port in the carb spacer? or often there is a port in the inlet with a bolt in it that you can take a signal from , like on this one just in front of the water pipe i
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Midas
Part of things
Posts: 505
Club RR Member Number: 14
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Sept 23, 2020 19:08:07 GMT
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As said, use the plate for your vac take off. I had problems with mega jolt on an a series using the vac port built into the carb. was it pulsing? i hear you can put a fuel filter inline to smooth it out? but only heard that
From dim memory the standard take-off was before the butterfly and the mega jolt wasn’t happy with it. I think the fuel filter trick is if you are combining vac pulses across multiple intakes. Anyway, I drilled the spacer plate between the carb and the manifold and used that, worked a treat.
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madmog
Club Retro Rides Member
Posts: 1,152
Club RR Member Number: 46
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Oct 20, 2020 20:42:26 GMT
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Yes fuel filter was to even out pulses from multiple intakes. Eg if you were using twin Webers or bike carbs which didn't have a common plenum.
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