28-12-2012, 03:38 PM
In the past I actually isolated the lift pump from the fuel tank and used a separate container, made it much easier to get precise results. The testing is done along a bit of motorway between two jumctions that are almost exactly ten miles apart, made for very convenient testing lol. The section had two hills, so the tests should be representative of real-life driving, and running in both directions eliminates most intereference caused by prevailing winds. All twst runs were done with the engine up to temp and tyre pressures at exactly 33psi. Id also make a note of the ambient temp for each run and general weather conditions to try and account for most external variables.
I did go as far as calculating the std deviation to make the tests as scientific as possible, my main issue was keeping my driving style consistent, some decent data logging kit would make that so much easier. Will look into sourcing pcmscan, already got an elm on order.
I did see a measurable improvement on a stage 1 map, but as you say, I think it was down to better tractability at low revs and the mildly increased rail pressure below 2k rpm, which meant I was able to shift up earlier without straining the engine.
I did go as far as calculating the std deviation to make the tests as scientific as possible, my main issue was keeping my driving style consistent, some decent data logging kit would make that so much easier. Will look into sourcing pcmscan, already got an elm on order.
I did see a measurable improvement on a stage 1 map, but as you say, I think it was down to better tractability at low revs and the mildly increased rail pressure below 2k rpm, which meant I was able to shift up earlier without straining the engine.