Low rev range power output

Well there is so many factors from the car mods to driver expectations remember the car was designed over ten years ago. Some main things to check are the exhaust system removing both Cats or some after market performance exhausts can give a flat spot at lower revs and if this is done a map is required so factor it in the price when doing such things. The Cam sensor if faulty can make the car feel dead the TDC sensor on the gearbox housing is more for failure to start. If the car had mods they might have been removed but the modified map may still be there some remove the mods to bring the used price down and make more money selling the mods used. When cold starting and driving away at that moment the first minute or 1/4 to 1/2 mile you can get the dead spot (kangaroo) that while accelerating the engine feels like it is going to die out if you lift off the accelerator at that moment and bring it back in gently it will pick up this is a common cold start feature where the car is switching from a set map to reading the sensors sealing the map sensor on the intake cover can help. Lambda readings can get stuck for some reason I had this problem the emissions warning came up a little time after I had replaced a dead battery I have a Renault clip and it has a function to test the Cats it runs the car at 2500rpm for 2 minutes and must regenerate or heat the Cat by fuel or ignition I could then see varying readings from the Lambdas again and the warning cleared I did no physical work or refuel the car. If you meet up with someone you can compare to ask a specialist for a small fee to test drive it and give an opinion it will be money well spent. If the timing belt etc has been changed and out slightly which also seems common power can be lost.

Real world you drive and shift below 4000rpm the EFI parts website states
"In the case of the 197/200 the factory engine can sometimes suffer with reduced road manners and 'flat spots' (RPM specific dips in performance) when modified. Accurate calibration (mapping) with these engines is much more critical of modification compared with the 172/182. With the more modern ECU there are many more functions at play within, each of which must be satisfied for the engine to respond properly at all RPM's and throttle angles.

Unlike the 172/182 even a standard car can benefit from a re-map. The factory ECU is bound to tight emissions regulation which mean that even from cold the engine must conform to strict fuel consumption at the expense of drivability. Richening the mixture just a few % and calming the cars lambda control from cold vastly improves these engines warm-up behaviour. Like the 172/182 though, performance gains are minimal with a stock engine (even if others are claiming 10hp+ - they are grossly misleading you)"
upload_2019-10-23_0-36-22.png


upload_2019-10-23_0-40-28.png
 

Attachments

  • upload_2019-10-23_0-39-54.png
    upload_2019-10-23_0-39-54.png
    703.7 KB · Views: 10
  • Like
Reactions: george murray