Thanks for your interest:Ted928 wrote:I went back and looked at your original post where it says you have an automatic tranny. Maybe that is not able to transmit all the new torque. Since the engine has boost and rich fuel, the engine must be making high power.
i am just guessing as I am not experienced in SC or automatic trannys.
Keep us informed.
Back in March '11, I did some research and it appears the AT in the Miata is the same as that used in the RX8. Here's that info
Found from four (unvalidated) sources that the AT in my '07 Miata should be SJ6A-EL (Miata '06 - '08) which is also used in the RX8 ('06-'09).
First source Level 10, which offers value body rebuild for $600 to sharpen shifts. Level10 says the trans is not controlled by the ECU, but by a separate trans controller which they can reflash or supersede for DOLLARS.
Second source: http://www.transtec.com/selector_guide/Mazda.htm
Third: http://www.autotransparts.com/MazdaTransmissions.html
Fourth: http://amtrans.nl/mazda.pdf
If the SJ6A-EL is, in fact, the correct trans, and is also used in the RX8, it should take a lot of power right out of the box. With a very little tricking, it should take a lot of really hard use.
Seems to me, to "lose" 50 HP in the drivetrain would require that the HP/torque must be going one of three places
(1) burned off in slippage -- but the trans isn't slipping: sound tach, etc.
(2) "detuning" through timing and/or fuel to reduce output. When we look at the fuel and timing logs, this is not apparent. The numbers go where the calibrator tells them to go.
(3) burned off in the torque converter. I can't think right off how to check that.
Thanks, Ted928 for the input. I'll see what I can find out about the converter issue.
PS:
Brian -- you know a Mazda Rep who might be willing to give some input on the trans?