I don't believe my tuner messed w/ the temperature compensation screen in my UTEC. How imperative is this to be done? There was an excel calculator with the UTEC download package that gives changes in percentage to input. Should I plug in my laptop to adjust this myself?

 

It's very important because if it is not done, then you can get lean-cuts when the temperature changes. I'm not positive how it works, but I know that my buddies RSX with K-PRO never had the temp. compensation done and when the temperatures would change outside, he wouldn't be able to go past a certain RPM depending on the temperature/humidity.

And the fact that you will only have the power that you were tuned with on the days that have the closest temperatures/humidity that the tune was done on.

kind of make sense?

 

yeah I'm going to plug up my UTEC to really see if they got done

 

Utec tend to over compensate but it does work. try adjusting 1-2% first and see how is your A/F.

 

that is the only bad part of the UTEC. the temp compensation sux!

it only allows you to set values for every 10*C (which is 18*F). and the utec doesn't interpolate between those values. either it is compensating at the set value (for the air temp) or it is not. ON or OFF.

I don't use it.

I just adjust my base fuel pressure when it gets colder.

 

Can this be done without a Return Fuel syst?

 

You don't necessarily need a return fuel system, but you do need some way of modifying your fuel pressure from stock (which usually means a fuel pressure regulator as part of a return fuel system)

 

And what about ignition? maybe if you are FI its not so important, but if you are NA, the timing may vary a lot from cold to warm climate.

 

For non-return fuel guys, I would suggest to use this feature (even though it is not the best). It has recently begun to get colder here in AZ (maybe not cold, cooler...) and I noticed a drastic change in my A/F ratio from when I got originally tuned (108F degree weather ). The resolution sucks since it is only every 10C degrees, but when I have ran my car at WOT in 65F degree weather the A/F ratio was low-mid 12's . I recently have added in more fuel for when it gets cooler at night and now I consistently run around 11.3-11.6 depending on the temp. I have also set it up to add in a little timing for when the temp allows for a little more power .

Its up to you though whether you prefer it or are capable of setting it up yourself. Your tuner will only be able to guesstimate what percentage of extra fuel you will need since i'm sure his shop does not have the capability of blowing 40 - 110 degree air over the front of your car to tune appropriately. So your better off learning how to adjust it yourself if you are going to use it so you can street tune it as the weather changes.

 

You could also use a map for different seasons...

 

How would you change seasonal maps...Lap-top interface??

 

Yeah, but the weather fluctuates too much. It gets around 85 during the day and 65 at night right now. That would constitute a map change right there.