Megasquirt - a story of injection
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Re: Megasquirt - a story of injection
Normally you would wire them up the same as wasted spark, so you'd follow the firing order.
Even adjusting per bank, you still don't know what's causing the difference.
If one injector is faulty and injecting too much fuel, you'll end up leaning off all the others.
I'm not sure if MS2 can do separate fuel tables for each output, or whether you just trim fuel out of an output. I've never looked into how that works because IMO the benefit is minimal.
Even adjusting per bank, you still don't know what's causing the difference.
If one injector is faulty and injecting too much fuel, you'll end up leaning off all the others.
I'm not sure if MS2 can do separate fuel tables for each output, or whether you just trim fuel out of an output. I've never looked into how that works because IMO the benefit is minimal.
Re: Megasquirt - a story of injection
I've actually been looking at the haltech elite ecus(please don't stone me). They can do long term learning on both banks separately using dual widebands, which is why I was just wondering if you wiring up the injectors together one one bank would allow easier fuel trimming.
Last edited by Husky65 on Sat Sep 16, 2017 9:45 am, edited 2 times in total.
Re: Megasquirt - a story of injection
Dual or single o2's?Dwayne wrote:My edelbrock pro-flo uses 4 injector channels to fire with the 351 firing order: 8/4 2/7 1/3 5/6
Re: Megasquirt - a story of injection
You must be feeling rich.
The same principles apply with any ECU.
If you're looking at an O2 per bank, a bad cylinder will drag all the other cylinders in the wrong direction.
The same principles apply with any ECU.
If you're looking at an O2 per bank, a bad cylinder will drag all the other cylinders in the wrong direction.
Re: Megasquirt - a story of injection
Single narrow band o2 sensor, but internet's says it's easy for me to fit wide band guage instead.
The wiring diagrams for old and new firing orders are both around pg 32 of the downloadable instructions. Part #3521 is old firing order, and #3541 is the new firing order so injector wiring slightly different between them but the rest is the same.
The wiring diagrams for old and new firing orders are both around pg 32 of the downloadable instructions. Part #3521 is old firing order, and #3541 is the new firing order so injector wiring slightly different between them but the rest is the same.
Re: Megasquirt - a story of injection
duel o2 allows ego1 and ego2 but wiring for each bank
I will someday think of something clever to say.
Re: Megasquirt - a story of injection
Yup, understand that, but the same applies to a single wideband also i guess. I mean, you'll never know of a rich/lean cylinder unless you get a wideband on each runner. So in terms of just a tuning tool, i guess I'm asking if there is any benefit by going to dual widebands and independant bank adjustment?hybrid wrote:You must be feeling rich.
The same principles apply with any ECU.
If you're looking at an O2 per bank, a bad cylinder will drag all the other cylinders in the wrong direction.
Re: Megasquirt - a story of injection
The haltech is a nice system where you wire in the controller, then both widebands feed to the controller, and the signal is then sent from the controller to the ecu via one CAN cable. Good for problem solving with the o2's also as the CAN will let you know what's going on.boofhead wrote:duel o2 allows ego1 and ego2 but wiring for each bank
Last edited by Husky65 on Sat Sep 16, 2017 7:41 pm, edited 1 time in total.
Re: Megasquirt - a story of injection
I see no advantage but MS can do it that way if required IO extender
I will someday think of something clever to say.
Re: Megasquirt - a story of injection
Yeah the IO extender I put in mine has a dedicated O2 input where you can chain up to 16 O2 sensors together.
Re: Megasquirt - a story of injection
Why do modern v8's run dual o2's then? Do they just average the reading between the two and use this to adjust off? Or do they adjust seperate banks?
Re: Megasquirt - a story of injection
some do either - all depends. MS can do it all.
I will someday think of something clever to say.
Re: Megasquirt - a story of injection
I thinks its because they are running them on the edge in an effort to make power and meet emissions and the are altering the fueling in a more dynamic manner then we need to, they all run knock sensors as well etc. In our engines the only benefit I see is know which bank is not running correctly.Husky65 wrote:Why do modern v8's run dual o2's then? Do they just average the reading between the two and use this to adjust off? Or do they adjust seperate banks?
Re: Megasquirt - a story of injection
Yeah, so more useful as a diagnostic tool I guess instead of an afr adjustment tool. I would like to add a knock sensor also.
Re: Megasquirt - a story of injection
I think with a blower it may be a good idea, perhaps, as long as they dont false trigger, I dont have one in mine. I think its part of the expansion board which also gives sequential injection.Husky65 wrote:Yeah, so more useful as a diagnostic tool I guess instead of an afr adjustment tool. I would like to add a knock sensor also.