OK gang I need some help from the megajolt map experts, never had a problem with the megajolt on the pinto it just worked! However with the zetec if
I floor the throttle its not too bad upto 3k then starts to coughs, judder and hesitates quite severely but if I slowley raise the revs it seems a lot
better and will gradually get up to 5.5k
My map is available here Linky to map
So far I've rejetted from 1.55 to 1.75, tried the original plugs, tried the original coil pack with old ht leads, removed the air box and left
the Honda cb600 hornet bike carbs open.
Is there a knobheads guide to mapping anywhere, I've looked around the auto sports website for such a thing but to no avail, like how do you work
out the load bins, I'm presuming its just equal up to 100 as I'm using tps
Any ideas?
Cheers
Rich
Looks like your spark map is upside down. You should have more advance at low throttle openings. Also, the zetec will need less advance than the pinto
does. Maximum advance in the region 24 - 28 degrees at WOT. In any case, if there is no issues with the spark quality, then it sounds more like a
fuelling issue.
[Edited on 5/2/11 by BenTyreman]
Meant to unplug it tonight and see what it was like in limp home mode, but forgot 
and my lad has now emptied the inside of a peugeot 106 onto my
drive trying to fit a bass box!
Will try tomorrow, interesting comment about my map being upside down, although was the same when trying a simple 2d map, I understood that the zetec
max advance was 32??
Cheers
Rich
Can't comment on the exact values for a Zetec, but I have a copy of the original spark map from an XE. Maximum advance at WOT is 20 degrees.
U2U me your email address and I'll send you the basic zetec map I had with bike carbs on a blacktop.
You'll need to alter the load bin settings, but as said, the advance should decrease as load increases, you've got it increasing.
quote:
Originally posted by r1_pete
the advance should decrease as load increases, you've got it increasing.
quote:
Originally posted by mookaloid
quote:
Originally posted by r1_pete
the advance should decrease as load increases, you've got it increasing.
In all fairness to Richard, ahem, errrrrrrrrrr I did that
we were trying to get it to run better and I wasn't thinking well - it was my first time with messing about with ignition curves in my defence. thinking about it - it is obvious when you consider how a normal dizzy with a vacuum advance works
quote:
Originally posted by RichardK
Load bins? how do I find out what mine should be then?
What like this? Software wouldn't allow me to do it, so did it in notepad instead.
Cheers
Rich
[Edited on 5/2/11 by RichardK]
Hi Rich.
I've just knocked this up using my 3SGE table as a base. My engine runs "speed density" so I have changed the load values to suit alpha
N.
I have put max advance at WOT to 31.
Ignore all the zero value bins. My map is 12 x 12.
You need the advance at WOT to be "all in" by around 2800 revs.
Cruising conditions ie. low load, should be 8 or 10 degrees higher than WOT.
The large area of 34, 35, 36 should be able to go a little higher. I have played safe.
My engine runs 44 in the cruise area and 34 at WOT.
It should be suitable as a starting point. I'm not guaranteeing it though.
What do you think?
Geoff
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Geof thats very kind of you , thanks mate, I've stuck those into a new map and will give them a whirl tomorrow, so you disagree that the
zetec's max advance is 32?
Cheers
Rich
Hi rich.
I was just playing safe.
Is it seems OK let us know.
Geoff
Yeh will do, will also host it for others if it works.
Cheers
Rich
Just switched the bins around as the software didn't like it the other way around, shouldnt make any difference though, should it?
The above megajolt map can be downloaded from HERE
[Edited on 5/2/11 by RichardK]
Rich, is it permitted to change the rev bins across the top line?
Geoff
yes mate
Rich, does MJ have a specified advance setting for cranking or does it use the table all the time.
If so, what is your setting?
If the table seems OK we could change the top line to include a 2800 bin and tweak the cruising values a bit.
But lets not get ahead of ourselves eh?
Geoff.
Is this what you mean?
and
Haven't a scooby doo what they dooooo!
Cheers
Rich
The settings would suggest that your cranking advance is zero degrees.
Could you possibly put a timing light on it during cranking to confirm this?
If it is zero it might benefit from putting up to 10 degrees or thereabouts.
Ge
Not sure as there are no timing marks on a zetec? I think!!
One thing - there is a well-known "issue" with Megajolt - the VR sensor has to be mounted on a very rigid mount. Getting ignition problems
around 3000 - 4000 rpm is a recognised symptom of this problem, as the sensor vibrating can mess up the signal to the MJ controller. Beefing up the
mount often makes this problem go away.
I called it an "issue", as really it's a problem with people fitting VR sensors where they were never intended to go!
Worth mentioning for others but doubt its my problem as I'm using the back of the flywheel using the pre installed ford sensor, but worth
thinking about as this sensor wasn't on my old flawless install, so the sensor could be iffy.
Cheers
Rich
Ok just been out and put that map on and also tried another map that R1 Pete sent over but sadly its still the same
I also datalogged the session if anybody under stands it, Here is the datalog
Also disconnected the mega jolt and is exactly the same in limp home mode, not sure if this is good or bad!
Connected the megajolt back up and started up the engine and changed some low end settings and the rev dropped and rose as I made changes so that
would indicate that the MJ is actually changing the timing.
Thinking about getting another cam shaft sensor???
What does the collective think??
Cheers
Rich
[Edited on 6/2/11 by RichardK]
time for a trip to bogg brothers?
Given that you originally said it was when you " floored the throttle" can we perhaps also assume that that it may be fuel related. Perhaps
not enough enrichment for not long enough resulting in fuel starvation?? I don't know owt about bike carbs mind you but perhaps not enough vacuum
signal to keep the fuel flowing at a higher rate for a long enough time. There was an issue with weber carbs when fitted to 16v motors that needed a
rework of IIRC extra progression holes from memory. So bearing this in mind perhaps the same sort of scenario is happening here.
Given it rises OK with a steady less vigorous throttle use then maybe the spark is not the issue.
quote:
Originally posted by RichardK
Worth mentioning for others but doubt its my problem as I'm using the back of the flywheel using the pre installed ford sensor, but worth thinking about as this sensor wasn't on my old flawless install, so the sensor could be iffy.
Cheers
Rich
I originally thought this was the problem, jets were 1.55 on the pinto 1.6 and increased them to 1.75 because of this issue.
Feels like ignition, but maybe its not
Originally I thought that my jets were too small, so I increased them - and the problem got worse!
I suggest that you either need a rolling-road session, or the use of an AFR meter...
Are you comitting the map to the megajolt? if you don't it reverts to default when you switch off? guess who was making that mistake when I did
my 2nd install on the Jag
Just had a nosey in your archive, are they 9R carbs? if they are it could be an air leak on the diaphragm/s. I sealed mine by filling the groove with
rubber lube, a leak will cause poor pickup, so if you've had the lids off its worth checking.
[Edited on 6/2/11 by r1_pete]
I am commiting the MJ and indeed I think I'm going to need commiting soon!
The carbs are Honda Hornet CB600 and worked great on the Pinto, have just sat on the shelf for 4 months while I did the new engine.
Think I'm going to accept defeat and go to Boggs.
Cheers
Rich
Hi again Rich.
Can we assume that you have tried 155 jets as well as 175?
Geoff.
Yes mate, thats what they originally had in and had the same symptoms, I was expecting to have to up the size slightly so didn't think much of it
when I went on its first run.
Cheers
Rich
Do you have any smaller jets?
I've got some spare if you want to try things out yourself.
Are your carbs standard apart from the jet change?
I would have thought that if they worked on the Pinto then they ought to rev out on the Zetec, even if a bit rich or lean.
Should you be trying stronger springs?
Geoff.
Yeh, thats whats doing my head in, thinking about trigger sensor?
You might try wiring in a 10K resistor across the VR sensor. In parallel. Or 15K. Or 20K.
I've seen this problem on the MS forums and they suggest it.
Geoff.
Now wondering if the crank sensor off and auto mondy is different to the manual one, I know the housing was and that got changed but used the same
sensor?
1999 mk2 mondeo
Cheers
Rich
[Edited on 6/2/11 by RichardK]
I had to do what spyder recommends with the resistors on my v2.2 but it would not rev at all beyond 2500rpm under any circumstances. Also I know that
big daz and scoobylav had problems with their flywheel based vr sensor and IIRC had a few of differing lengths from autos and manuals ( different
flywheels) I think. BUT If yours IS reving beyond they 3krpm under a light load I still doubt it'd be the crank sensor or it wouldn't do it
at all surely. You could try a tooth log in tuner studio and see what it looks like mind you.
[Edited on 6/2/11 by omega 24 v6]
Ah, interesting, does tuner studio work with megajolt then? Thought it was a squirt thing.
Cheers
Rich
Well it is a squirt thing yes. I am getting confused in my old age. What about an oscilloscope?? friendly college or tv repair shop perhaps.
1.4mm seems to be loads better, just need to find out why the revs are all over the place on the jaw logging thingy.
Cheers
Rich
Hi Rich.
Which ignition map are you running?
Does the car start OK?
Have you had the chance to try different maps?
Next step? Smaller jets? New plugs?
Geoff.
Hi mate, at the moment I've found a safe zetec map on the autolabs site that I've put on, will start to play with ign when I have a bit more
time, going away with work for a few days so wont be able to play. But today I got the jets down to 1.4mm and got the carbs balanced spot on, its a
bit of a pita the do the jets but can't help thinking that they need to gown down slightly even further maybe 1.3 or 1.35.
Have some new plugs ready to go in when Its sorted.
Why? You got a cunning plan?
Cheers
Rich
It could be the jets are to large as if they were correct for a 2 litre pinto then a zetec will probably use less fuel as they seem to be more
economical than pintos due to a newer more efficient design.I found with megasquirt that if i went to rich the engine would refuse to rev crisply on
full load and when I cut the fueling back a bit it picked up much better.
Paul
quote:
Originally posted by RichardK
Hi mate, at the moment I've found a safe zetec map on the autolabs site that I've put on, will start to play with ign when I have a bit more time, going away with work for a few days so wont be able to play. But today I got the jets down to 1.4mm and got the carbs balanced spot on, its a bit of a pita the do the jets but can't help thinking that they need to gown down slightly even further maybe 1.3 or 1.35.
Have some new plugs ready to go in when Its sorted.
Why? You got a cunning plan?
Cheers
Rich
Your not alone with this problem, i have exactly the same issue, the car drives well however when the throttle is wide open it splutters, ive been
from 1.6mm to 2.0mm jets with no success, however i blocked the air corrector jets and it did improve the situation, i now need to make sure that i
have a good map befor i visit Bogg Bros.
Has anyone got a suitable 2d map for a 2.0l Zetec Zx9 Carbs that they know is good?
Email kylerichmond16@hotmail.com