addicted2fun

Hey guys and gals,

Was just wondering, should you tune accordingly to the weather seasons. For instance, should you tune differently for the summer vs the winter? If so, why?

cast iron

No,

Tuning can last through summers and winters to get it 100% correct, but once dialed in, it will adjust accordingly.

Do you have to get your car re-tuned at the dealer every season? Nah....

TAQuickness

iTrader: (28)

I voted other only because I didn't like the no answers provided.

As cast iron pointed out, it can take a while to dail in a tune, but once it's spot on, you shouldn't need to adjust for the weather.

macca_779

A tune is a very variable bit of code. With all the sensors on board like MAP, MAF, IAT they are able to tell the controller exactly what the conditions are. Its just the tuner doing the right thing in the end to tell the controller what to do in all these variable conditions is whats key. So no you don't need a different tune for different conditions.. You just need a tuner that knows how to account for all the conditions to tell the controller what to do.

jessedale98

iTrader: (16)

well for a speed density your supposed to, right?

Eurospec2

iTrader: (2)

Even in speed density, if it is done correctly to begin with theres no need to re-tune for the weather

cast iron

You also need to give the tuner the time and resources required to get the job done. The process is much deeper then a simple dyno tune. Many can't figure that out, though.

jimmyblue

iTrader: (11)

There are some temperature tables (depending somewhat on
the vehicle model / motor / year) that can make the tune adapt
to the environment. Takes a long time to get the information
needed but your spark and on some models, fuel can be pushed
by temperature tables.

John_D.

iTrader: (2)

Yep, getting the bias right, between engine coolant temp, and intake air temp, is the big challenge. Otherwise, a perfect tune in 40 degree weather won't be so perfect in 90 degree weather.

macca_779

Not in EFI LIVE it isn't using say COS3. EFI LIVE has added an IAT/VE multiplier table and generating Ben's at different temperature points cures that issue and makes it simple to account for temperature. Once for example you have VE dialled in at 40 then log at 90 you apply ben average to the factor not the ve table as it was already correct at 40, then you just linear fill the rest and it becomes very close.

John_D.

iTrader: (2)

Very interesting. First I've heard of that. Sounds like a good approach.

What's "ben"?

addicted2fun

So bottom line it boils down to "no, not really and would be considered excessive" well, thats what im tracking.

macca_779

Ben's are factors that are created during logging comparing actual AFR to commanded AFR. If actual is leaner than commanded you will get a ben of higher than 1. If actual is richer than commanded you will get a ben of lower than 1. If they are the same the value will be 1. The ben can then be multiplied into VE for example to bring fuelling into line. Hence a ben of 1 multiplied by whatever will result in no change. Get the drift.

TAQuickness

iTrader: (28)

I wouldn't consider it excessive either. It just takes time and patience to tune - and this is true of MAF or SD tunes.