Miata Mailing List: November 1997, Message #162
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From: 	Bill Cardell <dlralt@gj.net>

Subject: Re: Sebring Timing   (was Re: Aw: MCA Mag Dyno Database)

Date: 	Sun, 2 Nov 1997 14:48:17 +0000



Tony Cooper wrote:

> 

 

> If I use an MSD unit which retards timing by 6 degrees under boost

> conditions I should able to go to 14 BDTC and still maintain Sebring

> specs.  I'm currently running at 12 BDTC (6 under boost).  Do you think

> I'm in trouble here?



This is a little misconception. You are running 12 btdc at idle. You are

not running 6 degrees under boost, rather you are taking 6 degrees out

of the ecu's timing curve under boost. IOW, your car is probably

actually running around 35 degrees of timing at say 3500 rpm. The MSD

will pull out 6 degrees, whether you need the retard or not. What we

have found is that the 1.6 doesn't need any retard below about 4,000

rpm, so you are losing midrange power by using the MSD. The J&S would

help build your midrange power, as would a programmable ecu.

Best idea for power is to intercool it somehow.



FWIW. 



bill



> Tony