stu200

iTrader: (1)

Andy, 18th

Yes the engine will give more oomph with the cold dense air in winter, but it doesn't matter what the weather was doing when the map was done, as the mapping is for optimum performance at a given matrix of conditions and not just the current conditions.

Imagine it like this ... you know that you're going in for a brain transplant, so you have to write down a set of rules for what clothes to wear (as you won't remember after the transplant)

Hot, dry, sunny : T-shirt, shorts & sandals
Hot, wet, sunny : T-shirt, shorts & sandals
Mild, dry, sunny : Shirt, jeans, shoes & socks
Cold, wet, cloudy: Jumper, coat, jeans, boots, socks & umbrella

Each day after the transplant, you wake up and look at the weather outside, then look at your list (or map) to see what to wear. Unsurprisingly, the details of what to wear changes as the conditions change, but the map would be the same whatever time of year you actually wrote it.


Coming soon to a bookstore near you "Remapping for Dummies"

[Edited by stu200 - 10/6/2003 2:51:05 PM]

Andy McCord

My cars going for a remap next week & i was wondering would there be any difference in the cars results between say a car mapped in january @ -2 & another mapped in july @ 28c, will it make any difference

stu200

iTrader: (1)

It shouldn't, because remapping is really just giving the car a revised set of instructions for what to do when a given combination of conditions occur (load, temperature, throttle pos., etc).

The fact that you're currently at one end of a sliding scale (in terms of temperature) doesn't affect the values that are put in, just which bit of the map gets hit on that particular day.

AFAIK

ZIPPY

Of course it will, if the ambient temperature is lower then the airflow into your intercooler is lower and subseqently you will run higher BHP due to the colder air on intake.

Thats why Turbo cars lose power on warm days.

Zippy

Andy McCord

what im actually getting at is if your car is mapped to the optimum settings on a cold day what effect would that have to performance on a warm day, besides the air charge being less dense dut to higher temps?

Andy McCord

stuart, when are you going to BRD?

AndrewC

Charge temp is a major factor in the onset of detonation. If you map a car to the edge of detonation in cool weather then it WILL det in warmer weather. Our cars do not have any form of IAT compensation over Fuelling or Timing.

Professional mappers do not map customers cars to this level and will leave a good safety margin.

Andrew...aka Mr Sparkly Knocklink...

stu200

iTrader: (1)

Which window did your safety margin go out of, Andrew ?

Bob Rawle

Speaking for myself only (can't comment on others), you need to map a car to suit the prevalant conditions ALLOWING for the extremes so I use a different air fuel ratio dependant on conditions and pull back from the det line by a different amount due to same. That way you "should" get the best from the car when conditions suit but not get problems in hot sticky weather, for example.
A turbo car can vary 40 bhp summer to winter depending on state of tune.

cheers

bob

Andy McCord

Thanks guys for the input, thats 1 less stupid question to ask you bob on saturday

AndrewC

Stu,

The "it's a second car that I don't need every day and can't wait for the engine to go bang so I've got an excuse to rebuild it" window

Andrew...

SCOOBY TOWERS

iTrader: (7)

Andy,
Bit of a long question & answer session to cover one day a year

Its great ooop north - for Ducks & Scoobs anyway

Chris

ZIPPY

Stu , his question was will it post better results due to the outside temparature and i replied yes it will,differences of upto 40 bhp have been quoted by an expert based on weather conditions.I'm aware that only 1 map can be running at any 1 time thats why the mappers build safety into the map to allow for the different weather conditions and driving styles.

Mapping for dummies, i might laugh eventually.

Zippy

stu200

iTrader: (1)

Jeez, pick your rattle up and stop sulking.

It was a jokey remark referring to a popular series of books, FFS

ZIPPY

Hey have you heard the saying 'its not what you say but how you say it' fits perfectly for your second post.

Me sulk, never.

Zippy

stu200

iTrader: (1)

Noted. I'll see if Amazon will give me a refund on "Being Patronising for Dummies" then

Andy McCord

Stu, you are going to swindon arent u? would you be avail for a swop of dates?

Mark_S

Andy,

Just had mine done last Saturday, you wont be disappointed!.
Big thanks to Bob and Branko.

Mark...

stu200

iTrader: (1)

Andy, 'fraid not mate - I'm all booked up until the middle of November now.

Andy McCord

Mark, glad it went well mate, stu no probs, cars been in storage for 8 weeks whilst i get my garage finished off, looks like i will have to drag it out the day B4 & dump the oil & filter & give it a good run b4 blasting down the motorway to bobs pad