Alan MaC

Looking for a bit of guidance here.

I regularly see Scooby Net Contributors talking about less performance in this kind of Weather on Rolling Roads & Stuff.

Mine is going in for a Remap next week. If it is Hot V's Colder Wetter Weather, does it mean that, if I had it done on a colder day, I would get a better Remap??

More BHP?? ORRR... lower BHP on the day but, when it becomes, Colder Weather, would it make it back up to where it could have been ??

A bit of advice would be most welcome!!

Thanks

Alan MAC

AndyC_772

iTrader: (2)

You'd be better off having it mapped on a hot day IMHO - the last thing you want is a car that goes like stink in winter and then grenades itself in a shower of big-end shells in summer..

Alan MaC

Thanks for that Andy.

Tuts

If it was mapped in summer then in winter it would get more air and thus run lean.
If it was mapped in winter then it will have less power in summer but run rich.

Can the ecu adjust the fuel enough to cope with these differences once it has been mapped?

I know as standard it can, but to get more power with a map you are running it close to the edge.

If it is at the edge then it doesn't have as much room to cope with temp differences, so is it safer to have it running lean or running rich?

I thought rich was safer than lean. Which is more likely to do in your engine?

Am looking for another remap soon aswell so I was wondering about ambient temps.

Any mappers answer this?

Alan MaC

Great point, I don't know.

Powerstation are doig the remap and seem to be on the ball. It's being done next Tuesday, I will ask the questions and let you know.

Thanks for your points.

Tuts

Cheers Alan, will help me loads.

Alan MaC

Any one got any other advice to offer on this please??

Thanks

Kind regards#

Alan MAC

Tuts

Bump cos I'd really like some more views on this.

BedHog

I had mine remapped last summer - it survived the winter....

From the mappers point of view I really doubt this matters, he will just adjust the fuelling and the ECU will control whatever the air temps.

I have no idea - but I'm sure this is a mute point. The ECU must surely be able to cope with this - lets face it a factory map is fine no matter what the temp is.

stevey

iTrader: (2)

to what i was told they never map fully to the weather (ie on a cold day you would make more power) they map slighty less thus making it safe for both the summer and the winter. if that makes sense

Alan MaC

Thanks to you both for that.

Alan MaC

It goes into Powerstation tomorrow for it's remap, any other bits of late advice please?

Thanks.

Alan MAC

ex-webby

This all sounds a bit weird to me, people saying about when to get a car mapped.

I had mine mapped when it was very cool (running 370-380bhp)...... ran it at Time Attack at the weekend in temps approaching 30deg's in conditions that you would not get on the road, racing around Silverstone and the ECU was coping fine. Checked the ECU logging on track and it was running sweet at the 16 multiplier with no det.

BTW... mine was mapped by PowerStation.

Regards,
Shaun.

Alan MaC

Thanks for that Shaun.

As I said, watching some of the previous threads on Rolling Roads & stuff & hot weather I wanted to ask the question.

Saw your input from the Weekend and, what you have said, is good enough for me.

Thanks for reassuring me.


Kind regards

Alan MAC

ex-webby

Alan,

No problem.... hope you enjoy your car after the mods!

Regards,
Shaun.

Tuts

Having it mapped when very cool then running it in warm weather will mean less air in the engine so it will run rich. The only downside That I can see is less power. Running rich wion't cause det will it?

The thing I'm worried about is having it mapped at the moment while it is 28deg and then running it in winter. This will mean more air thus lean running and maybe det. It would seem that the optimum time to map is in the winter.

This would only be the case if it was mapped to the limit. Hopefully as stated above a mapper wont push it that far and will leave enough room for temp changes.

I didn't think it would matter when I had mine done but I honestly didn't think I would be seeing summer/winter temp differences of over 30deg in the UK!!

I wonder how much tolerance there is in a remap?

Welloilbeefhooked

iTrader: (3)

AndyF mapped mine when it was around 27 degs last summer and its fine all year round. Your MAF takes into account the air temp and ecu calculates load from this and other sensors to give the right point on the map.

Ive had no problems at all.

Tuts

Good stuff, cheers for that.

Mo

As Tuts has said AFRs will richen up in the warm weather and yes the MAF 'can' compensate for temperature changes dependant on how the compensation tables are set-up.

Shaun, I'm sure yours was/is OK in those temperatures however don't rely on the IAM as an indication of det, I've mapped a few NewAge ECUs that have had their IAM at 16, +KC applied and nothing logged on the knock signal yet det was still present. You got an in-car wideband installed, be interesting to see what AFRs you were running on the day?

ex-webby

Mo,

Absolutely..... I have a knock link and also datalogged knock correction and ignition correction etc. Everything was fine and dandy. No wideband installed, but I did log via OEM sensor.

simo

Shaun, out of interest, what oil temps did you see at Silverstone?

ex-webby

I peaked at about 113degs..... but remember the Spec C has an oil cooler and as said previously ambients were approaching 30degs.

Regards,
Shaun.

SiHethers

Ambient temperature will not affect MAF based ecus particularly, as long as there is headroom on the load points to accomodate for increased charge density in cooler months.

MAP based ecus have temperature compensation tables (either ambient or charge temp based) to allow for varying ambience.

Either way, if your car is mapped appropriately it will not matter, although actual engine performance may vary with temperature variation (due to changes in charge density as indicated above)

Simon

Alan MaC

Hello All,

Went to Powertation today for the remap.

Rich was on the ball and did a great job. Tempature was around 22 C. Drove it through the Malvern Hills on the way back.

Great fun!!

Delivery is much smoother & is dynamite!!


I am now convinced that if it is mapped correctly ( and Powerstation are on the ball) Temprature either way is accounted for.

Thanks to all who took the time and trouble to offer advice.

Kind regards


Alan MAC