Cold start valve (MAC-12D)

[Mihnea Cotet]

MB and 1B are nearly the same, except for the intercooler that's different 
due to the impossibility to fit it behind the front grill on the Urq, the 
MC-1 has 7.8:1 CR compared to 8.4:1 on the MB/1B. All 3 have only 1 knock 
sensor IIRC. Boost is lower on the MC (about 1.4 Bar absolute IIRC and 
1.7-1.8 on the MB/1B, IIRC again) and that's about it...

HTH,

Mihnea

At 14:53 4/12/2003 +0000, Mike_Buckham at ptk.pioneer.co.uk wrote:
>Hi Ben,
>
>It is CIS. The MAC-12D is very similar to the MAC-11 except that it doesn't
>have any oxygen sensor input or carbon canister control. It always works in
>"open loop" mode. As far as I am aware, the 1B engine that it controls (and
>MB engine, I think) is the same as an MC-1 engine but without some of the
>emmisions control systems such as the oxygen sensor and the carbon
>canister.
>
>If someone could tell me the differences between the 1B, MB and MC-1 then
>I'd be very interested.
>
>Cheers, Mike.
>
> >> Message: 9
> >> Date: Thu, 4 Dec 2003 09:29:15 -0500
> >> From: "Ben Swann" <benswann at comcast.net>
> >> Subject: Re: Cold start valve (MAC-12D)
> >>
> >> Interesting - does the MAC-11 have this feature too?
> >>
> >> Is the 12D EFI or CIS?
> >>
> >> Ben
> >>
> >> [> I know that the cold start valve (as it is known) is pulsed while the
> >> > engine is starting and for a brief period afterwards, depending on how
>cold
> >> > the engine is, but is it also pulsed when the ECU detects sudden
> >> > acceleration due to a large change in the MAP sensor input?
> >>
> >> Yup.
> >>
>
>
>This e-mail and any files transmitted with it are confidential and 
>intended solely for the use of the individual to whom they are addressed.
>If you have received this e-mail in error please notify your system manager.
>
>Please note that any views or opinions presented in this e-mail are solely 
>those of the author and do not necessarily represent those of the company.
>
>Finally, the recipient should check this e-mail and any attachments for 
>the presence of viruses. The company accepts no liability for any damage 
>caused by any virus transmitted by this e-mail.
>_______________________________________________
>quattro mailing list
>quattro at audifans.com
>http://www.audifans.com/mailman/listinfo/quattro