Originally posted by TsiMiata:
There are some people running the straight neck ZE engine in their MX-3's. With the KL31 cams and the straight neck manifold those should run great with the KL31 & KL36 ecu's. Before it didn't really seem like the extra trouble was worth it for the straight neck manifold but maybe it is.
I think you're a little confused.. (Maybe I'm wrong?) There are two basic types of KL-ZEs:
1) STOCK strait neck, from MX-6 or 626, KL31 cams (high-end TQ) made for KL31/KL36 ECU
2) STOCK curved neck, from Millenia, KL01 cams (low-end tQ), made for KL62 (AUTO) ECU
So to correct TSIMiata ( ? ) MOST people use a "strait neck [klze]" in their MX-3s, they just change the intake manifold to a curved one (but they still have the high-TQ KL31 cams). But for those of us that had a curved IM stock, we have Millenia engines. They are the same except for the stock intake manifold is curved (above) and the have KL01 cams, not KL31 cams. This is what changes the peak TQ rpm to about 4200 not 5500. The VRIS timing in the KL31/36 ECUs is set up for high-QT KL31 cams in STOCK strait neck ZEs. So, when you use a KL31/36 ECU with a MILLINIA ENGINE (with KL01 cams) the VRIS is off a bit... The VRIS timing for the KL01 cams is correct in a Millina KL62 ECU, though.. Except it's for an auto tranny...