I thought the multijet was a turbo charged diesel, but in the spec from Fiat in the little book they sent out it says this, "with supercharger and intercooler". Which is it?turbo or supercharged?
ah bless em shame as a supercharger would eliminate any lag
Hi can you tell me how you cured the lag problem thanks
If you go back far enough any kind of forced air induction was referred to as Super ChargingI thought the multijet was a turbo charged diesel, but in the spec from Fiat in the little book they sent out it says this, "with supercharger and intercooler". Which is it?turbo or supercharged?
It will be an ECU remap I believe.
You can't effectively remove lag with a remap, lag is caused by the time it takes the engine to make enough exhaust gases to turn the turbo, therefore unless you change the turbo to a smaller one or quicker spooling ball bearing/twin scroll/variable geometry turbo's etc or do work to the breathing, like bespoke larger exhaust system to create less back pressure, the lag will always be there.
On a small engine like the 1.3, it just doesn't have the lungs to fill the turbo quickly enough, so lag will always be present, this is fundemental on any small turbo engine.
This is why on modern turbo cars the turbo's themselves are very small and built into the exhauist manifold before the CAT to make them as close to the engine as possible to eliminate lag as much as possible, though this has the down side of if you start to run more boost from the turbo you run the risk of overspeeding them shortening there life span, which also creates much more heat increasing inlet temperatures as well, so yes you will get more power to start with at determent of increased heat which on a hot summers day will negate any increases made. You can get round this by fitting an intercooler if it doesn’t have one, or fitting a bigger one, but then the inlet track is longer so this has effect on lag, its all a balancing act.
Car manufacturers spend millions developing engines now to be built to very tight tolerances, and to make them drive as best as possible with very flat torque curves. The engines also spend hundreds of hours on test beds going through long term durability testing to ensure that they will meet and exceed requirements, this can’t be replicated on the road by aftermarket manufacturers.
Don't get me wrong, I love tuning cars, but modern cars are built now to a cost and specification to meet pretty exacting standard and this makes it much tougher for aftermarket tuners get more out of them, yet retain the reliability.
Im not getting mine done, thats for sure... if I didnt like it as is, then I wouldnt have bought it in the first place. Still too many issues with remapping for my liking, heard plenty of horror stories.
Im not getting mine done, thats for sure... if I didnt like it as is, then I wouldnt have bought it in the first place. Still too many issues with remapping for my liking, heard plenty of horror stories.
If you ever see the torque curves of a modern turbo car, no matter if its petrol or deisel the torque curve is very flat, this makes the car effortless to drive, giving a wide spread of torque, they achieve this by using the ECU and wastegate control, though this is hardly new science, even old cars like integrale's had ECU/wastegate control to give less boost in lower gears to preserve the drive train.
On the most modern of cars with fly-by-wire throttle this is taken further, by using the abs sensors the ECU can sense wheel spin and it actually adjusts the amount of throttle appllied as it works out exactly how much torque can be transferred to the wheels, so even if your foot is flat to the floor, you are not getting full throttle,and because there is no cable to attach your foot peddle to the throttle body you do not perceive any difference, you no longer have as much control over your car as you did with cable opperated throttle control.
What many re-mappers do is lift some of the safety elements of the boost control, so that you get full boost in lower gears making car faster, or let the boost rise higher at higher rpm rather than flatten out, giving a big surge in power/torque which feels good as a big sruge intorque is what is felt by the human body in the acceration of the car, so feels faster.
What this can lead to, not saying it always will, is the clutch and all drivetrain components getting excessive wear, though in general this will not be felt until the car has covered a fair few miles. The only thing sensed by you the owner is probably more tyre wear, and the traction control ABS functions being alerted more by the excess power trying to be transmitted to the road.
There are some good very clever people out there that understand all these elements that are controlled by the ECU and can work with them ensuring that there is still safety margins built in, and ulimately the car still drives superb, maybe even better than before, but in general all these people work on the cars as given to them, and don't just flash a universal map onto the car.
Im not getting into sharing tales of woe regarding remaps, but there are plenty of cars whove had remaps and had problems, also remaps that have actually reduced the BHP of a car.
J333 is talking a lot of sense here, listen to him
Which is why you should go to a reputable company and get a before and after RR.
I only wish nuovapanda would share is tales of woe