Microsquirt V8 MOD wasted spark batch fuel boosted

[phillyc77]

Hi guys, I should have my 5.4 based 349ci "Boss349" MOD motor assembled in the next few weeks. It uses my Boss349 brand 6.669" stroker rods. The shop would like to run it in and for me to do the tuning on their Engine dyno.

Basically I've been looking at the MS3X and use two Quad Spark boxes and the factory Ford Modular COPs. I was attracted by the sequential spark and fuel for a V8.

However for cost reasons I'm leaning to the Microsquirt. I will also buy the Tuner studio registered to get the auto-tune feature amongst other things. I'd like to put the money to a newer laptop with a good size screen to replace the one that died.

Engine Build details are
* 349ci (3.572" bore * 4.358" stroke)
* Ported 4V / DOHC heads (320/240cfm)
* 232/232 0.468/0.468" cams
* 1 7/8" Long tubes
* Aussie Boss intake 10.5" runners
* 100# injectors
* E85 fuel
* 11.1cr

Aiming for about 520-550hp/460tq NA. But will also add an intercooled Paxton Novi 1500SL and shooting for 900hp/800tq at about 14# boost.

My concern is mostly with the large injectors and batch fuel. I do also want to be able to live tune the engine and not have to shut down and load up changes. Will the micro be suitable?

Thanks for reading. Hope you can help.
Phil

[phillyc77]

I bought the Megasquirt3X instead of the cheaper Microsquirt. The concern was the batch fuelling.

In addition to the higher ECU cost I needed to buy not just a MS3 cable but the additional MS3X cable. Plus two Ignition boxes instead of one for sequential ignition. Pretty much it doubled my spend. Hopefully it's worth it!

[R100RT]

I'll offer a comment which will probably see very little agreement from others. It has to do with running wasted spark on certain engines having high induction pressures where a potential for cross firing of the "wasted" side can occur under the right conditions of cam overlap, ignition retard under high boost, and fuel charge pushing into the scavenge side cylinders. This is documented by Hugh McGinnis in his old "Turbo Charging" book from several years back. I witnessed this on my boxer engine with carbon tracks back up the inlets but more importantly, an increase in performance once I switched to sequential ignition. For a highly boosted engine that would always now be my recommendation - but again just an opinion.

[ashford]

hopefully im not to late to comment on this but ford cop coils do not get along well with bip373 transistors( aka quadspark). they go into current limiting around .6 ms dwell. i have bought some fairchild igbts in a to220 package that meet similar specs that ford used in their ecu's but never got around to testing them

[rickb794]

Are the Ford COP low impedance?

Ouchie! I have some Duratec coils (marked EE03A-12A366-AA I was saving to use .5 ohm primaries!!!!!!
That is like some of the MSD stuff, Capacitive Discharge style.
Probably not compatible.

[ashford]

Are the Ford COP low impedance?

Ouchie! I have some Duratec coils (marked EE03A-12A366-AA I was saving to use .5 ohm primaries!!!!!!
That is like some of the MSD stuff, Capacitive Discharge style.
Probably not compatible.

not sure of the duratec coils but all 4.6-5.4-6.8 and tfi coils dont get along well with bip373's. they are not cd or true inductive but somewhere inbetween. the have constant 12v and a switching ground. i guess they like a short strong slap of 12v.

the coyote coils do work fine with the quadspark though

[phillyc77]

hopefully im not to late to comment on this but ford cop coils do not get along well with bip373 transistors( aka quadspark). they go into current limiting around .6 ms dwell. i have bought some fairchild igbts in a to220 package that meet similar specs that ford used in their ecu's but never got around to testing them

I'm back to this project. Trying to keep the cost down by using what I've got. What about Accel Supercoil 140034? I have a set of them from a motor I bought. They are a direct fit, so I'm guessing they'll be not suitable too. Thanks Phil

[rickb794]

Accel Supercoil 140034

from summits web page

Primary Resistance: 0.620 ohms

[phillyc77]

Thinking will go LS truck coils part no. D585 / UFC262.

I won't need the Quad spark boxes now.

Thanks for your help people!

[phillyc77]

Thinking will go LS truck coils part no. D585 / UFC262.

I won't need the Quad spark boxes now.

Thanks for your help people!

Got the BF Falcon home a month ago.
About to buy those LS coils.
https://rover.ebay.com/rover/0/0/0?mpre ... 2600586733

Looking to buy MSD 8.5mm spark lead roll.
https://www.summitracing.com/parts/msd-34019/

What boots would I need to use to get down deep in the head, just use a normal parallel / straight and push it way down in there?!