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Performance data

Quite a few dyno runs have been performed on Elans with and without chips. None of the data here was acquired by me or even in my presence.

V3 & V4 Chips

The V3 & V4 chips increase power simply through increasing boost. They also improve boost delivery by modifying the parameters of the boost control routine in the ECU. The graph shows power curves from various Elans, two each of standard configuration, Kilimanjaro chip fitted and Everest chip fitted. The chip version varies, V3.x and V4.x are represented. All the data was supplied by members of the LotusElanCentral forum.

std-Kili-Ev power


V5 Chip

The V5 was developed by created 16 power enrichment maps that varied smoothly between the stock Elan table and a considerably leaner (10.2:1 compared to 12.3:1 at the richest point) candidate table.

Candidate mixture maps

The test runs were performed on a dyno with exhaust gas analysis and ElanScan logging so that any knock could be detected. Not all the maps were run, the plan was to home on the best power version without knock.

Results are below (the curves were smoothed to reduce the influence of random variations and assist the analysis).

V5 candidate power runs

The V4.2 (a high boost chip with no fuelling modifications) was used as a control. Its power curve was subtracted from the candidate maps to give a power gain graph:

Power increase graph

The next graph shows the trend between power gain and the change in a/f ratio

Effect of a/f increase on power

Dyno data is intrinsically pretty variable, the above data was acquired in one session with one car but the same map can still produce quite different results on different runs (see the two points for map 8). Intake temps, boost, etc were similar in each case. The value in producing data like this is that trends can be spotted in spite of the noisy data.

Map 8 was selected as the default map for the V5, it offers the best power boost with no measured knock.