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Home > A-Series EFI / Injection > FI vs. Carb

Dr. jinG

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265 Posts
Member #: 368
Senior Member

Roseville, CA (USA)

Apologies if this has been discussed, but I'm not finding any threads on the topic...

I'd originally started my project thinking that MegaSquirt would be the way I'd go, but have not seen any threads that seem to have a final solution/map for the A-series motor, after many years of experimentation. So, this leaves me wondering if I should just go with a standard carb/dizzy setup. Is there truly an advantage to going FI and dizzyless over the standard Metro Turbo setup?

**************************************
1967 Cooper 's' Turbo build @ www.drjing.com


Brett

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Doncaster, South Yorkshire

totally my opinion

for turbo application read all Paul S, Rod S, infact all the efi section... and see the lengths they have gone to do it right

or

for n/a speak to specialist components :)


and again imo go dizzyless every time, the carbs are working well upto 300bhp but the clockwork dizzys are out paced by mjlj / megasquirt

Yes i moved to the darkside *happy*

Instagram @jdm_brett


wil_h

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Betwix Harrogate and York

In all cases, binning the dizzy and fitting mapped ignition is an advantage, no question.

Again, if you have 4 individual inlet ports, then FI is a no-brainer. But if you only have 2 inlet ports then you have two options:

1) Use a wet manifold setup. This is a non-ideal setup that will have a fuel distribution across the cylinders no better than a carb. that is to say, uneven AFRs. But the additional control should offer an advantage in fuel economy and fine tuning of the setup.

2) Fully sequential, staged FI. This is a superior solution, offering more equal AFRs across the cylinders. but it is more complicated to construct and map.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Paul S

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Formerly Axel

Podland

Wil is spot on with his reply.



On 10th Jun, 2011 Dr. jinG said:
I'd originally started my project thinking that MegaSquirt would be the way I'd go, but have not seen any threads that seem to have a final solution/map for the A-series motor, after many years of experimentation.


You will not find a "final solution/map" for any injected A Series, regardless of the number of ports. They nearly all need some fabrication and all will need mapping.

The finalised siamese options were written into the MS2/Extra code two years ago and up until recently I was running this setup on my 998 turbo. Just fine tuning since then rather than experimentation.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


Carl S
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Bristol

On 10th Jun, 2011 Dr. jinG said:
not seen any threads that seem to have a final solution/map for the A-series motor


When I finally get around to installing the EFI setup on my 998 motor, I plan to create an msq which suits the MPi manifold and the stock inejctors that it comes with, in the hope that other people will be encouraged to plug and play in a similar fashion, working with a base that has been created but would be fairly close to what was required before they began.

Don't hold your breath though, it may not be until next year that I get back to working on it.


Rod S

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Formally Retired

Rural Suffolk

On 10th Jun, 2011 Dr. jinG said:
but have not seen any threads that seem to have a final solution/map for the A-series motor, after many years of experimentation.


Just to repeat what all the others have said - there will be no final solution/map unless we all built identical engines - and that will never happen :)

If you are apprehensive about joining in on the sequential siamese injection route at the moment, or don't think "wet manifold" is much better than a carb, my suggestion would be to by an MS2 in kit form (even just a partial kit) and build it for ignition only at first.

It will do ignition far better than a Megajolt (no need for the EDIS module if built right) and has many extra features that Megajolt misses (although in fairness, Megajolt is catching up).

Then you have the option of adding injection later.

Just my thoughts having been playing with this for just over two years now......

Schrödinger's cat - so which one am I ???


Dr. jinG

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265 Posts
Member #: 368
Senior Member

Roseville, CA (USA)

Thank you all for the input! My apologies for mis-understanding the posts I've seen on this. So, is it safe to assume the following?

Standard Kit: Set it up, and it is what it is.
MS/EFI: Better control, and folks are just constantly tweaking to obtain "perfection"

I'm keen on just being able to drive my Mini after many years of inactivity, but thanks to a benefactor have been offered a MS box (yet to be purchased, and I wanted to confirm that it's worth doing before my friend makes a purchase geared toward eventual Mini use). I'll follow the advice of starting with dizzyless ignition, then eventually move to FI.

**************************************
1967 Cooper 's' Turbo build @ www.drjing.com


jbelanger

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Montreal, Canada

Just make sure you don't acquire an MS1 since that won't be of any use for port injection (could be used for a wet manifold setup).

Jean

http://www.jbperf.com/


Dr. jinG

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265 Posts
Member #: 368
Senior Member

Roseville, CA (USA)

Thanks, Jean. I've been out of the loop for a bit, now, but I'm seeing a MS2 kit. Is there a 3, or variants of the 2? And which would be ideal for an A-series (with all of the potentially needed bits, but none of the stuff I wouldn't need)?

I'm going to have to try to log into my old MS account, now... *wink*

**************************************
1967 Cooper 's' Turbo build @ www.drjing.com


Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

IMO go with the megasquirt even if it is an MS1, you can always swap to the MS2 processor later on,

the megasquirt is good as you can view and log more info that the megajolt, (coolant, AFR, TPS, IAT etc)

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/


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