prawnabie
|
| posted on 4/4/10 at 06:51 PM |
|
|
Megajolt or Omex
Was speaking to Dave at mech motorsport on friday about binning the elec ignition on the locost and going for an ECU to control the sparks.
He advised me to go for and omex 200 as he prefers this over megajolt. His reason for this was megajolt only has a low number of speedsites. I assume
that a speedsite is a point in the rev range that that you can map to? i.e the more speedsites you have the more accurately you can map it and the
less interpolation the ECU is doing?
If my thinking is correct, can anyone confirm if his suspicions are true? I baulked at the price of the omex and it doesn't seem to offer the
outputs that megajolt does!
Thanks
Shaun
|
|
|
|
|
zilspeed
|
| posted on 4/4/10 at 06:56 PM |
|
|
It has a 10x10 grid.
So, that's ten speed sites, each with ten load sites.
Doesn't sound too poor to me to be honest.
|
|
|
David Jenkins
|
| posted on 4/4/10 at 07:17 PM |
|
|
And it extrapolates values when working between each cell in the grid, so it goes smoothly from one value to the next.
|
|
|
iank
|
| posted on 4/4/10 at 07:21 PM |
|
|
Omex200 has 21 speed sites with 11 load sites. Also interpolates between them.
So allows very slightly more accurate (in the real world) settings.
Biggest advantages are not requiring a separate EDIS unit, and more rolling roads being happy to map them.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
|
|
|
snapper
|
| posted on 5/4/10 at 08:27 AM |
|
|
Its a cost thing, while the Omex has more map resolution it cost lots more.
If cost is a big consideration then the Megajolt is the cheapest option, many people use them and are very happy.
You could fit the Megajolt with the trigger wheel and VR sensor and if you really don't like it, swap out the jolt and EDIS for Omex later when
funds are available, selling on the jolt to get some money back.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
|
|
|
zilspeed
|
| posted on 5/4/10 at 09:09 AM |
|
|
quote:
Originally posted by David Jenkins
And it extrapolates values when working between each cell in the grid, so it goes smoothly from one value to the next.
Anorak Alert.
It interpolates the values. 
|
|
|
NS Dev
|
| posted on 5/4/10 at 09:35 AM |
|
|
either will be fine, but personally I avoid the "mega" stuff.......manufacturer support from the big ecu manufacturers is worth having,
they CAN go wrong! (I had a board failure in an old mbe unit and mbe sorted it very quickly for me)
My current leaning is towards DTA or Emerald, neither is cheap but both give superb support over the phone, and both have "someone who's
mapped one" at most sets of rollers.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
|
|
|
David Jenkins
|
| posted on 5/4/10 at 10:25 AM |
|
|
quote:
Originally posted by zilspeed
It interpolates the values.
I couldn't remember how to spell "interpolates"... I still don't!
|
|
|
MikeRJ
|
| posted on 5/4/10 at 11:51 AM |
|
|
The Megasquirt with the MS2 processor has 12x12 fuel and ignition tables, and you can run ignition without the EDIS if you want to.
To be honest, the bigger the tables the more of a PITA it is to fill them all in. You need enough to do the job and no more, and the number of
working MS/MS2 installations suggests they have enough.
[Edited on 5/4/10 by MikeRJ]
|
|
|
prawnabie
|
| posted on 5/4/10 at 11:56 AM |
|
|
Thanks for the replies. Can you fit megasquirt and disable the fuelling side of the ecu in case I fitted injection at a later date?
|
|
|
MikeRJ
|
| posted on 5/4/10 at 01:18 PM |
|
|
Yes, you can use a megasquirt for ignition only.
|
|
|
