MAP Sensor

[Murphy, Ian]

Probably both gauge or absolute pressure will work fine for your system,
unless you intend to drive up and down alpine mountains on a regular basis.
Otherwise all you have to worry about is baro changes which are quite small.
Are you calibrating on a dyno or just on the road?

I don't know much about carbs, but I believe that they tend to lean out as
altitude increases. That might mask any issues with your DIS anyway. I could
be wrong - any Pike Peak hillclimbers out there willing to comment?

Ian

> -----Original Message-----
> From:	Mike Blakey [SMTP:mike.blakey at baesystems.com]
> Sent:	Wednesday, March 14, 2001 9:58 AM
> To:	diy_efi at diy-efi.org
> Subject:	RE: MAP Sensor
> 
> The system is DIY, It works VERY well on my prototype vehicle (fiesta). I
> now want 
> to put it on my MG (SUs) which do not have a convenient TPS. Therefore I
> was going 
> to use the manifold vac for a load value. As the fuelling is by carbs and
> therefore 
> metered relative to differential pressure (i.e. manifold to atmospheric) I
> assumed 
> that for load I would use the same. If I need to change the sensor, or
> just block 
> off one of the ports that should not be too much of a problem. I suppose I
> could 
> try both methods and see what the difference is.
> 
> 
> 
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