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Home > Help Needed / General Tech Chat > MEMS 2J & Supercharging

MrOz

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Crazyhill, Livi

Ok, second posting on the forum and it might be a stoopid question, but someone once said to me

"There aren't any stupid questions, apart from the ones YOU always ask!!!" Hmmmm

Anyway, how would the MEMS 2J ECM on the MPI handle fitting a Eaton M45 Supercharger?

Edited by MrOz on 23rd Jan, 2009.

"se ne estas rompita, ne ripar ĝi - supercharge ĝi."


Sprocket

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Preston On The Brook

I have heard this a few times before, and, while the theory may stand up, I dont think it would work. Infact I know some one who tried it and it didnt work.

The theory is, as with any Mini EFi supercharger set up, the fuel is injected before the supercharger, therefor you could use the vacuum between the throttle body and the supercharger for the MAP sensor on the MEMS2J ECU and fuel the engine.

The problem is that with the supercharger you are moving away from the MPi calibration. then there is the acceleration enrichment, there just wont be enough, not even close. add to that the difference in charge air densities.

Buy a programable ECU and do it properly, it would be a lot less time consuming trying to work around the production ECU *wink*

Edited by Sprocket on 23rd Jan, 2009.

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


1972-ANGUS

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sallys gap. garden of Ireland




On 23rd Jan, 2009 Sprocket said:
I have heard this a few times before, and, while the theory may stand up, I dont think it would work. Infact I know some one who tried it and it didnt work.

The theory is, as with any Mini EFi supercharger set up, the fuel is injected before the supercharger, therefor you could use the vacuum between the throttle body and the supercharger for the MAP sensor on the MEMS2J ECU and fuel the engine.

The problem is that with the supercharger you are moving away from the MPi calibration. then there is the acceleration enrichment, there just wont be enough, not even close. add to that the difference in charge air densities.

Buy a programable ECU and do it properly, it would be a lot less time consuming trying to work around the production ECU *wink*



Second that motion.
regards
colin


MrOz

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248 Posts
Member #: 5007
Senior Member

Crazyhill, Livi

On 23rd Jan, 2009 Sprocket said:
I have heard this a few times before, and, while the theory may stand up, I dont think it would work. Infact I know some one who tried it and it didnt work.

The theory is, as with any Mini EFi supercharger set up, the fuel is injected before the supercharger, therefor you could use the vacuum between the throttle body and the supercharger for the MAP sensor on the MEMS2J ECU and fuel the engine.

The problem is that with the supercharger you are moving away from the MPi calibration. then there is the acceleration enrichment, there just wont be enough, not even close. add to that the difference in charge air densities.

Buy a programable ECU and do it properly, it would be a lot less time consuming trying to work around the production ECU *wink*


Yeah, it has been suggested that I plump for a Emerald, Megasquirt or CAMEMS ECM, but I'd prefer to retain MEMS. It's not just a cost factor, well it is cos I'm tighter than a Nuns box, but I'm using this as a research project for my studies.

With regards to MAP, I was thinking about the possibilities of inverting the MAP signal, but I'm still not convinced that this won't result in a lean mixture.

I dig what you say about the enrichments Sprocket - might need to pull the draw string on the thinking cap a bit tighter.

"se ne estas rompita, ne ripar ĝi - supercharge ĝi."


Sprocket

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Preston On The Brook

It just wont work, but feel free to try it.

I would like to know how you would invert the MAP signal and how the theory of that would work?

Still leaves the acceleration enrichments, warm up enrichments and full throttle fueling, wherever or however you fit the MAP sensor, on a standard MEMSJ2 *oh well*

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

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