Remapping

[bigyin1]

I would disagree there - a map which takes the engine closer to the limits of it's power is more dangerous than a generic map which works within known tolerance levels that delivers a decent power increase without going to the extreme. After all it's what Prodrive do with the PPP - that's a generic one not a live map and it's well respected for it's driveability and reliability.



I'm confused - how can you measure the changes if you don't use a dyno? if you tweak the timing on the road how do you know it doesn't actually lose power?

If you tweak the timing how does the tuner know that it won't tip the EGR temps too far or over/under fuel?

Ignoring the scooby you mention with a datalogger, how do you get things like AFRs right when driving?

Not looking to be provocative here I'd just like to understand

A dyno is only useful for measuring full throttle power. How often are you on full throttle during a week?? Not much I'd say, especially with todays traffic!! Most of the time spent mapping, isn't on a dyno its on the road sorting our light/part load throttle applications. Giving a car more power is relatively easy, but making it so that it drives as the manufacturer intended (or as the customer wants it ) is more difficult.

Logging equipment is vital during this on-road situation, specifically fuelling on a petrol car, once you have the fuelling sorted the rest falls into place. This is done using a lambda probe installed straight into the exhaust where possible or via OBD port if the ECU allows it. In addition you have EGT, rail pressure, boost pressure, intake temperature, injection duration, torque demand, engine load, air flow, ignition timing... to name but a few. You then have to find the map(s) amongst some 2 million bytes of information on some cars (which can be displayed in up to 6 different ways) and alter accordingly.

Hope this is of some use...

 

[Bobby Dazzler]

A dyno is only useful for measuring full throttle power. How often are you on full throttle during a week?? Not much I'd say, especially with todays traffic!! Most of the time spent mapping, isn't on a dyno its on the road sorting our light/part load throttle applications. Giving a car more power is relatively easy, but making it so that it drives as the manufacturer intended (or as the customer wants it ) is more difficult.

Logging equipment is vital during this on-road situation, specifically fuelling on a petrol car, once you have the fuelling sorted the rest falls into place. This is done using a lambda probe installed straight into the exhaust where possible or via OBD port if the ECU allows it. In addition you have EGT, rail pressure, boost pressure, intake temperature, injection duration, torque demand, engine load, air flow, ignition timing... to name but a few. You then have to find the map(s) amongst some 2 million bytes of information on some cars (which can be displayed in up to 6 different ways) and alter accordingly.

Hope this is of some use...

Sounds dead easy!!

 

[wemorgan]

So does that mean that remaps with a rolling road are no better/worse than those without, but just different?

 

[bigyin1]

So does that mean that remaps with a rolling road are no better/worse than those without, but just different?

Remaps with a rolling road only give you a before / after reading on full throttle of your car (with whatever fuel you have in the car) on that particular rolling road on that particular day. On a diffferent day, with a different dyno and dyno operator you'll get a different result.

 

[martin_a]

Also a dyno doesn't take account of things like additional load, air speed etc. There are a wide number of factors which can affect a cars performance and although a lot of garages might have a big fan in front of the car to try to give it more air, there is no subsitute for the car being able to slurp down o2 as it was meant to and as such fuel correctly etc.

Real world conditions/driving is where it is at!

m.