Megajolt EDIS or Dizzy

topcatcustom · Post by **topcatcustom** » Wed Aug 13, 2008 8:49 pm

Hi again, I have looked through the forums but struggling to find an complete answer!
My RV8 project- blown with a 100bhp shot of nos, fed by a 4bbl atop is being built on a (as much as possible) budget as I will do all the work and fabrication myself- my simple question- bearing in mind I dont like spending money on stuff if I can help it (or it is very beneficial is):
Should I stay with my ancient dizzy (maybe get a new one) or upgrade to EDIS or MJ? (don't really know the difference between them).
Would there be much of a power increase (will keep revs below 6000 to be safe) or is the only benefit at really high revs?!?!
When I was doing my mini's a while ago we could ditch the points for an electronic unit- (possible fitment or any good with the RV8?!)

Thanks!

bill shurvinton · Post by **bill shurvinton** » Wed Aug 13, 2008 10:04 pm

Just do it. Big fat reliable stable spark. Exactly what you need. Will start better, will run better will handle the NOS better.

topcatcustom · Post by **topcatcustom** » Mon Oct 20, 2008 10:51 pm

So to go EDIS is it really just a case of- fit trigger wheel, control module & 2 coil packs? Also would I be able to wire in an Omex rev limiter with EDIS? (They only say about coil fitment)

topcatcustom · Post by **topcatcustom** » Wed Oct 22, 2008 2:17 pm

ps is edis completely fixed timing?

Lehto · Post by **Lehto** » Wed Oct 22, 2008 2:44 pm

No its not... it needs an ECU like megasquirt to control the timing.

Teesdale_landrover · Post by **Teesdale_landrover** » Wed Oct 22, 2008 2:51 pm

here is a good guide based on the canems system which i think only does 4 cylinder but it is still relevant
http://www.canems.co.uk/pdf/ignition_manual.pdf

Eliot · Post by **Eliot** » Wed Oct 22, 2008 4:50 pm

Rev limiting with EDIS is limited to retarding back to 10' btdc - you cannot command it to drop sparks.
Works fine on my chevy, I have a hard fuel cut if the retard doesn't catch it - which has never kicked in so far.

Not sure if MJ supports a rev limiter, MS does however. Personally I would get a MS, because you always have the option of upgrading to fuel control later - plus i suspect you will get wider support for MS.

topcatcustom · Post by **topcatcustom** » Wed Oct 22, 2008 5:06 pm

Thanks guys, think I might just stick with a dizzy for the moment then as I am running carbs so have no need for splashing out on MS, means I have to go back to searching for a interim cover with dizzy hole tho!

topcatcustom · Post by **topcatcustom** » Thu Oct 23, 2008 3:12 pm

2 more Q's...

Did Rover really design a whole new front cover when they went dizzyless or did they just plug the hole (ie meaning do the later serp covers have a blank which can be drilled/reamed out for a dizzy?)

and:

I havent stripped my distributor down yet but it will probably be well worn out- am I best replacing it with something like this or putting new springs etc in the old one?
http://cgi.ebay.co.uk/NEW-V8-3-9-Rover- ... dZViewItem

I would like a Mallory one or something flash but to be honest I just can't afford it!