Aussie Driver - 1990 Mazda Miata/MX-5

Aussie Driver
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Posts: 2
Joined: Sat Sep 03, 2005 4:13 am

Aussie Driver - 1990 Mazda Miata/MX-5

Postby Aussie Driver » Fri Feb 24, 2006 3:34 am

Name: Aussie Driver aka Steve
Vehicle: 1990 Maazda MX-5/Miata
Engine: 1.8l 99-00 NB engine with CAI, full exhaust and soon to have lumpy cams.
Injection: Port, alternating, stock 230cc injectors.
Description: Fuel, spark and idle control using MSnS-E 29h and MegaTune 2.25.

My Miata/MX has recently had an NB8A engine fitted and while that was being done I upgraded my MS (which had been running fuel on the 1.6) to also run spark and idle control for the 1.8. I used the CAS board upgrade as described on the diyautotune site which works for a Miata CAS as well as the Toyota 4ag. The ignition mods were borrowed from Nate Sullie’s success story.

The VE table was generated using MegaTune, the spark advance table was sourced from a FM Link table and then modified for the 12 x 12 MS spark tables, and the idle settings were used from a post on the MS EFI forum also by NateSully.

The car literally started at the first attempt. I mucked around with the idle screw for 30 seconds to stabilise the idle between 840 - 860 rpm and it happily drove around the block without any problems other than a bit of adjustment being needed for the acceleration settings.

I'm just amazed that the MS is working so well with the spark and idle given that all I've done is a few board mods based on some forum posts, and expanded and guestimated a spark table from a FM link spark table. I admit that it's nowhere near being properly tuned but for it to be behaving this well straight away has simply stunned me.

After taking the car for a 30 min drive and it is almost as good as the OEM setup without any tuning what-so-ever. If it's this good already, I can't wait until I start tuning it!!!

Aussie Driver
MegaSquirt Newbie
Posts: 2
Joined: Sat Sep 03, 2005 4:13 am

Postby Aussie Driver » Sat Feb 25, 2006 2:26 am

Here is my spark table that I sourced from a FM Link table. I added the extra MAP rows to make a 12x12 table from the Link's 6x16 table and I left out some of the Link's spark columns after 4000 rpm as they had very little difference between the values (and I have great faith in MS's interloping between data points in the tables).


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