1999 Miata in ITS?

I am far from any kind of IT expert, but:

From the GCR:

To maintain the stock basis of Improved Touring, updating and/or
backdating of components is only permitted within cars of the same
make, model, body type (e.g., sedan, station wagon, convertible, etc.),
and engine size as listed on a single Improved Touring Specification Line.
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Click to expand...

While the quote is valid, you have to expand further. The 1.6 and 1.8 Miata's are on different lines in the ITCS so the swap is NOT legal.

AB
 
While the quote is valid, you have to expand further. The 1.6 and 1.8 Miata's are on different lines in the ITCS so the swap is NOT legal.

AB
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Click to expand...


That's exactly what I meant. I thought it spoke for itself!! Especially since it references engine size right in there as well.

Matt
 
Hello all,

I'm a total IT newbie but have been around Miatas for a while. In the interest of sharing info, here is what I know about the hardware changes between the 94-95 and 96-97 Miatas:

94-95: 8.8:1 compression ratio pistons, ODB-I, 4-wire coil packs, optical CAS, factory rated hp @ 128
96-97: 9.0:1 compression ratio pistons, ODB-II, 3-wire coil packs, magnetic CAS, 2nd O2 sensor post cat, factory rated @133hp

Mid-way through '95, Mazda moved to the true 9.0:1 pistons and added the ODB-II electronics, but did not use them (no 2nd O2 sensor).

In 1996, ODB-II was put to full use, including the 2nd O2 sensor, which is post cat. I believe the additional O2 sensor makes up for most of the 5hp gain (allows better control over fueling, ie: leaner), but the increased compression probably helps a bit too. I'm not sure of the advantage, if any, between the 3 and 4-wire coil packs (4th wire was the tach signal).

The differences above are probably why Spec Miata requires different throttle restrictors for 94-95 vs 96-97 Miatas. :)
 
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