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Old 06-07-2014, 08:01 AM   #11 (permalink)
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spyder2 - '00 Toyota MR2 Spyder
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Originally Posted by topcat View Post
I also have the 1ZZ-FE engine. At Wide Open Throttle (WOT), my scangauge indicates open loop at all RPMs, even as low as 1.4k RPM. This means it will enter fuel enrichment WHENEVER I floor it. So I don't floor it unless absolutely necessary!

BTW, if my rpms are too low during the hard acceleration I get rattle from what I'm led to believe is the timing-chain. In that case I of course back off the throttle until things sound better or change down a gear. Busting the engine will negate any MPG savings!
Your 1ZZ-FE is a 2005, which has throttle-by-wire and thus will run rich and produce slightly better torque off the line. jeff88 and mine are earlier ones with cable throttles, which run stoichiometric all the time.

The rattle is probably from the clutch springs, common sound on manual transmission cars.

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