2002 to 2000 Engine Swap, tune changes?
I'm running a T25 turbo on my 2002 Miata with a Megasquirt 3. Compression is bad in cylinder 3 so I'm swapping in a used 2000 engine. What changes, if any, will I need to make to the tune I have to get the new engine to run safely, other than turning off VVT control and changing the timing map? Perhaps it is better to just start with a raw base map even though every single part external to the new block and intake manifold is the same?
Thanks for any help, Sean |
Biggest difference should be that you're losing VVT and gaining VICS. So you need to control VICS (simple digital output, turn on above 5000rpm or so with a 200rpm hysteresis).
Other than that you need to re-tune fuel. Shouldn't really require a change in spark. |
In to hear from experts. With lower CR, more advance could be possible, as well as possibly more boost, depending on where your limits are. Personally, I would start with the map you have, but re-tune from scratch starting with base timing, latency (different ignition), idle valve and idle control. Indeed, mod the MS to control the VICS.
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put the 02 head on the 2000 motor, use the 2000 IM.
wire up VICS to work. anything else and you fail. |
Originally Posted by Braineack
(Post 1296117)
put the 02 head on the 2000 motor, use the 2000 IM.
wire up VICS to work. anything else and you fail. I guess I could take my 02 head to a shop and get it checked out. It's high mileage (180k). I already ordered a 2000 head gasket, but I'm also doing a coolant reroute so I assume this would work out perfectly anyway. I'll have to look into wiring up VICS. I got the car second hand so I'm not extremely familiar with all the MS3 wiring and such. From what I've read I can simply leave the VICS unplugged for now and worry about it later, correct? Thanks. |
its worth the time to research now.
you dont want to lose vvt, and replacing VTCS with VICS is a bonus. |
the answer is: everything. they use different timing curves and different fuel maps and then the whole vics vs vtcs and vvt stuff.
This is my first time taking an engine out of a car |
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