[Diy_efi] Cam duration & MAP sensors

[James Ridewood]

On Monday 03 June 2002 3:28 am, you wrote:
I believe it is due to the large amount of overlap, this causes pressure 
waves to be sent back up the inlet port giving the MAP sensor wildly 
fluctuating signals therefore making it difficult to determine how much fuel 
to spit in.

One way around this may be to go for a self mappable ECU like Emerald using 
throttle bodies from someone like Jenvey. This setup does not rely on MAP 
(unless using forced induction) just throttle position vs RPM and is 
currently very popular here in the UK.

Hope this is of use

J.

> I will be putting a V8 in my S10 and the cheapest way of doing this is to
> use TBI injection. I would like to use a long duration cam but these seem
> incompativle with MAP based injection. If the problem is low vacuum at idle
> can I not use an external vacuum pump or resovoir? Why are MAP sensors and
> large cam overlap incompatible? Secondly, would there be any bebefit in
> using a BB TBI on a 327 SBC. No emissions testing to worry about.
>
> Thank You.
>
>
>
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