car acts different at slight temperature changes? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-11-2007, 03:28 PM   #1
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Default car acts different at slight temperature changes?

i've been trying to tune my car lately, but the car seems to change quite a bit when i go from 80C to 90C, would anyone know why?
i've been trying to play with after startup enrichment but it only goes up to 70C, and the higest setting is 70C.

is anyone having the same problems or has a resolution?

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Old 03-11-2007, 04:23 PM   #2
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70C = 158F which is high enough for 'warmed up and shouldn't need any special enrichments'. Though you can change the scale if you choose.

The difference from 80-90C shouldn't be that great. In fact the ECU shouldn't need to change your tune at all in that range. The ECU uses your coolant temp sensor for warmup purposes, but once it's warmed up (above 160F or about 70C) it doesn't use the CLT input anymore as fuel is properly atomizing and the engine shouldn't need extra enrichment anymore. I'd suspect something else is going on in the tune that needs to be corrected. The '90 Miata at our shop acts just fine in that temp range, no trickery in the tune going on there. And we actually haven't dyno tuned it just yet, just a rough street tune. It goes on the dyno this week most likely.

Got any datalogs showing the problem? (Include wideband if possible)

Also, exactly what changes? How's it acting?
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