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If it's outside of the returns window, Racechip can take it back and re-programme it for the 4.2, plus the correct loom.
Whilst I appreciate companies like Racechip, TDI Tuning and DTUK have good reviews, I'm dubious as to whether most of the results are actually placebo.
If you check YouTube for dyno runs of vehicles before and after these boxes (a Mercedes C220 comes to mind, as it's a neat 5 minute video), only 7bhp was gained (about 4%), and around 8% more torque, raising from 460 to 510, far from the 30% claimed. Looking at the dyno graphs, the increased torque is delivered lower in the rev range but to think how these boxes actually work - by fooling a MAP sensor, MAF sensor and fuel sensor, I'm sure all it's actually doing is fooling the ECU to get either the turbo to boost harder or to tell the ECU the fuel rail pressure is lower than it actually is, increasing that pressure and fuel, providing that additional torque and sensation of additional pull. I imagine gains are going to be even less in an non-turbo-charged vehicle.
My personal view is that I would not be happy spending £400 for such little gain, but you need a dyno to prove that. I think the better option is to go for a mid-range stage 1 tune which you can get for the same kind of price, which would include a vehicle specific map with minor modification for your specific vehicle and requirements and crucially, a before and after dyno to prove any performance gains. A bit more difficult with four wheel drive, as you need a four wheel dyno for accurate runs but places like Celtic have them and, there's a few dotted around the South Coast.
Sorry, just my view that I would return if I could. If you can't then I'd shove it on ebay. 2015 Range Rover Autobiography 4.4 SDV8
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20th Jul 2022 11:47pm
