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· Registered
'06 ZR +120 (HQM) '04 ZR 105 (IAB)
9,788 Posts
Your use of E85 may be having some impact on the improved performance - fitting a 52mm TB was quite popular on the 1.4 ZR in the early days, but those who did so only reported an improved throttle response. Several of those who tried them on a rolling road after fitting a 52mm TB actually found it had given them a reduction in power, so it was always a mod which folk were discouraged from doing for that reason.

The changes that you had done when converting to E85 have perhaps left it better able to utilise the (presumably) improved airflow?
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