Megasquirt replacement ECU for Hotwire

Ian Anderson · Post by **Ian Anderson** » Sat Jan 29, 2011 12:53 pm

Has anyone fitted one and would like to give any feedback - good, bad or indifferent? The ECU I refer to is the one that connects direct into the original Ecu socket without nee for toothed wheels etc.

I'd like to fit this unit on the GT40 but would like some feedback before handing over the ££££

Ian

stevieturbo · Post by **stevieturbo** » Sat Jan 29, 2011 1:05 pm

Ian Anderson wrote:Has anyone fitted one and would like to give any feedback - good, bad or indifferent? The ECU I refer to is the one that connects direct into the original Ecu socket without nee for toothed wheels etc.

I'd like to fit this unit on the GT40 but would like some feedback before handing over the ££££

Ian

Im sure that anything that gives you more control, and removes the airflow meter can mostly be a good thing.

No idea how good or bad that trigger method might be though.

Plug n Play is always a big help too !

It may not be perfect, but to get you into aftermarket systems, it would be a good starting point, as I imagine it doesnt cost the earth ?

just depends what route you want to take, who will be tuning it etc. And what mods you might go for in the future

DaveEFI · Post by **DaveEFI** » Sat Jan 29, 2011 2:56 pm

Deleted by DaveEFI to save space.

DaveEFI · Post by **DaveEFI** » Sat Jan 29, 2011 3:09 pm

No direct experience of these 'plug and play' Megasquirts, but IIRC they are basically a standard one configured and adapted for that installation. So if in the future you wished to modify things for any other configuration MS can do - like say EDIS ignition - it shouldn't pose too much of a problem.

I've looked at fitting an MS PCB inside the original Lucas flapper ECU case for someone who insists on things looking original, and it can be done. But in practice will cost a lot more than adapting a standard loom to fit a standard MS.

The beauty of the MS is all the details you could possibly need are out there and freely available. Although it can take some finding - and learning.

Incidentally, I'd urge you to consider the EDIS option. I started off with MS fuel only on my SD1 EFI with flapper injection then added EDIS. It is a very worthwhile improvement, especially as regards fuel consumption.

Post by **katanaman** » Sat Jan 29, 2011 6:31 pm

Its just the normal MS but with sockets/adapter that fit the Rover wiring harness. It just saves you either making an adapter or changing the plug, other than that there is nothing different/special about it so all the usual opinions apply.

Ian Anderson · Post by **Ian Anderson** » Sun Jan 30, 2011 8:46 am

So I'd be the guineapig - expensive pig!

Ian

DaveEFI · Post by **DaveEFI** » Sun Jan 30, 2011 9:35 am

Ian Anderson wrote:So I'd be the guineapig - expensive pig!

Ian

No. Loads have replaced both flapper and hotwire systems on an RV8 with MegaSquirt.

This plug and play device simply offers an easier way to do things, for those who aren't good at wiring or whatever. And of course you pay extra for the convenience.

CastleMGBV8 · Post by **CastleMGBV8** » Sun Jan 30, 2011 2:31 pm

Ian,

I was only thinking yesterday strangely enough, that now Phil has bought out the new adaptor that plugs straight in, that this must be the best solution to your drivability problem, let alone the amount of fuel you must be wasting by having to use a lower gear all the time to get round the kangerooing.

Getting rid of the airflow meter will solve a lot of the slow running problems and probably release a bit more power because of the reduced restriction and mapping should sort out the rest.

You can use the dizzy to trigger the ignition but a trigger wheel would offer more accuracy for the timing.

If you have any doubts, contact Phil at Extra EFI and talk it through with him.

Regards,

Kevin.

Ian Anderson · Post by **Ian Anderson** » Sun Jan 30, 2011 4:04 pm

How about a cam position sensor in a "distributor" shaft then EDIS off that?

I have NO space at the crank pulley

Ian

DaveEFI · Post by **DaveEFI** » Sun Jan 30, 2011 4:33 pm

Ian Anderson wrote:How about a cam position sensor in a "distributor" shaft then EDIS off that?

Trouble is that won't sort the slop in the drive between crank and dizzy. But would allow the use of a mapped timing system. You can use the original Lucas trigger with MS and use the internal MS coil driver. However, this would mean adding to the engine loom.

I have NO space at the crank pulley

Ian

I have AC on my car (so three pulleys) and managed ok Although couldn't use the standard Trigger Wheels sensor bracket.

CastleMGBV8 · Post by **CastleMGBV8** » Sun Jan 30, 2011 6:05 pm

Ian,

As far as I know all you do is lock the dizzy's advance mechanism and take the signal from the existing sensor. the ECU then controls the advance curve.

Kevin.

Post by **katanaman** » Sun Jan 30, 2011 6:37 pm

Trigger wheel goes between the engine and existing pulley so it doesnt add any length to anything. It basically sits in currently unused space.
What makes you think you would be a guineapig? There are hundreds of RV8 engines running on MS.
Personally I would leave the ignition alone for now and get the fuel sorted but if you want to do the ignition then yes Edis is probably the easy route and no cam phase sensor required.

daxtojeiro · Post by **daxtojeiro** » Sun Jan 30, 2011 7:05 pm

Hi Ian,
theres a load of my PnP RV8 ECUs out there now and hundreds of normal MS ECUs.
The PnP RV8 ECU can be either fuel only (simply swap the AFM with an air temp sensor) or wasted spark. This needs a 36-1 wheel but as has been said, the wheel sits behind the main damper, so no extension. Give V8D a ring and speak to Shaun, he can soon help you out with info on that. 01775 750000
cheers,
Phil

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Megasquirt replacement ECU for Hotwire

Megasquirt replacement ECU for Hotwire

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