D Beddows
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| posted on 9/2/06 at 11:00 AM |
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Crossflow on Megajolt/squirt - any good?
I know there's a couple of you out there who've done one or the other and I'm curious as to wether you think it was worth the
effort? I'd be very interested in seeing any rolling road results (especialy graphs) as well if you've got them.......?
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ed_crouch
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| posted on 9/2/06 at 12:05 PM |
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Thats sounds like a pretty decisive opinion to me.
Im interested too. Im currently in the USA on work, so I wonder if I could get a kit back to blighty without getting arrested on suspicion of
terrorism. All those components would not look good on Xray!!
Ed.
P.S. I guess the only megaExpensive (tm!) bit os gonna be the throtle bodies, but in theory at least you could pike a single throtle body of a BMW in
a scrap yard, and just have a custom manifold to begin with, then go to full throttle bodies later. Go here: www.jenvey.co.uk
I-iii-iii-iii-ts ME!
Hurrah.
www.wings-and-wheels.net
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wesley_uk2k
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| posted on 9/2/06 at 12:11 PM |
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How about a set of these on a custom made manifold?
http://cgi.ebay.co.uk/SET-OF-THROTTLE-BODIES
_W0QQitemZ8036267572QQcategoryZ72205QQrdZ1QQcmdZViewItem
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boxfile
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| posted on 9/2/06 at 12:30 PM |
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I've got a megajolt system with twin 40's on my 1760 crossflow.
I mainly did the switch as it was about the same price as getting a short body electronic dizzy to fit under the twin intake manifold. But the
diffrence it makes to the throttle response is quite dramatic its so much smoother and picks up well from anywhere in the rev range.
For my money has to be one of the best mods you can do to a crossflow thats already in reasonably tuned state.
I am not a number!
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David Jenkins
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| posted on 9/2/06 at 01:43 PM |
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It's something I've half-heartedly been looking at - the big decision is about whether to take the car off the road for a period of time
(plus the setting-up kerfuffle), rather than the cost.
The idea does appeal to me though - I just wish I understood it better (I missed all those articles in PPC).
David
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stevebubs
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| posted on 9/2/06 at 03:34 PM |
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I ran my xflow on an Emerald (ignition only) quite successfully....can't see a MJ/MSnS-E being any problem....
You get the added advantage that you don't have to worry about the condenser failing or the points gap needing to be reset...
[Edited on 9/2/06 by stevebubs]
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stevebubs
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| posted on 9/2/06 at 03:37 PM |
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quote:
Originally posted by David Jenkins
It's something I've half-heartedly been looking at - the big decision is about whether to take the car off the road for a period of time
(plus the setting-up kerfuffle), rather than the cost.
The idea does appeal to me though - I just wish I understood it better (I missed all those articles in PPC).
David
I think bill shurvinton will do a drive-in drive-out service if you contact him directly...
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MkIndy7
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| posted on 9/2/06 at 07:03 PM |
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We put the Megajolt on our Pinto which was running Webber Twin 40's at the time and it made a world of difference!
Like somebodys mentioned it made it much smoother and it picks up form almost any revs much moire driveable and forgiving.
It does take a while sorting out the wireing but not because its complicated, just because it takes ages unwraping the existing wireing on your car
and installing the new wires neatly if its already in situ but well worth it, so much so that were considering megasquirt now, so you may be best
going for that from the start!
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D Beddows
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| posted on 9/2/06 at 08:44 PM |
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Ok I'm sold! but why does no one ever talk hp and torque figures when it comes to mega type upgrades!? - if someone puts twin 40 webbers on
their engine you usauly can't shut them up about how much extra power they're getting, with this, the most anyone seems to say (and
I've spent a good bit of time browsing the interweb about this) is 'the throttle response is transformed' or 'the engine is
now incredibly smooth'..........is there some kind of conspiracy going on!? 
I'm well aware that power figures generaly speaking are mostly stuff and nonsense but can no one give me a clue?
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stevebubs
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 posted on 9/2/06 at 08:52 PM |
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Those using twin 40s are forever coming in from the cold after spending a couple of hours trying to balance them...
Those still using dizzys are forever coming in from the cold after spending hours trying to set the points gap and then finding the condenser has
gone
Those using electronicery are too busy out enjoying themselves driving their cars....
Actually, closer to the truth is most people are "scared" of electronics in their cars and are much happier with the black art of carb and
dizzy fiddling where a small turn of a screw can make a big difference...
[Edited on 9/2/06 by stevebubs]
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MkIndy7
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| posted on 9/2/06 at 09:08 PM |
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Unless you've been on a rolling road before and after then you can't prove bhp or torqe figures, you can only describe how the changes
effected the car.
And to make it more drivable is making it faster and better, it may even be down on bhp (unlikely) but if its delivered in the right places then it
will be a faster, better behaved and nicer to drive car.
And the type of people that go through the fitting of it and then spending the time to map it properly aren't the types who'd be shouting
"oooh its got 10bhp more now" because there probably not bothered how many bhp its got aslong as it drives well and feels better to
them.
(And unless you spend a fortune on setting up and jetting Twin 40's there awful! i'd dispute anybodys "power gains" without a
very sorted setup)
[Edited on 9/2/06 by MkIndy7]
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boxfile
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| posted on 9/2/06 at 09:10 PM |
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If your dizzy had a suitable advance curve and was running the optimum amount of static advance. I don't think you'd see much of a top end
BHP gain because the systems already optimised for a full load full revs situation.
What an electronic system allows you to do is optomise the ignition advance setting across the whole engine rev/load range.
I am not a number!
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paulf
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| posted on 9/2/06 at 09:17 PM |
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I put Megajolt on my crossflow last year and it made a big difference to the driveability and smoothness. I never put it on a rolling road and dont
expect the top end power to be any different as once passed 3500 revs the ignition advance is at maximum anyway, but it does seem faster through the
gears as the mid range response is so much better.
It also has the advantage of giving a shift light and rev limiter.
Paul.
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D Beddows
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| posted on 9/2/06 at 10:04 PM |
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I knew that would make me sound shallow 
I realise that megajolt on it's own isn't going to give you much if any of an overall power increase on a sorted standard ignition BUT
will make the car quicker because the engine is more driveable and this should show up on a dyno graph shouldn't it? Surely megasquirt and the
resulting improved fueling should increase power though???
One thing I am suprised at is that few people seems to set the systems up on a rolling road - surely it's much easier (and quicker) to do on a
set of rollers under controllable conditions than bouncing along in the passenger seat with a laptop on your knee or am I missing something!?
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MkIndy7
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| posted on 9/2/06 at 10:37 PM |
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Megasquirt should make quite a power difference, more so than using the standard carb with megajolt, unless the engine is modified then Megajolt might
not make that much difference at all.
Ours has a fast road cam and slightly different carb jets (had twin 40's when 1st installed) so it requires a different advance curve from the
standard vaccume and even a different map from the electronic advance version.
As for mapping going down the road, although it is quite entertaining it isin't that hard to do (even easier with megasquirt as it has a data
logger),
its cheep and its definately real world scenario's (like trying to set off form the lights in too high of a gear, if it bogs down or pinks you
just change that area of the map to suit).
You notice patterns start appearing and even "holes" when you adjust surrounding figures too much without updating the others.
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Cazzy R
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| posted on 9/2/06 at 10:58 PM |
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Anyone experimented with spark plug gaps? On the basis that an EDIS coil pack would knock out a much bigger 'bang' than a single coil it
might be possible to open up the plug gap, to maximise the spark size, and improve combustion.
Just a thought. 
Cazzy R
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