OK, now I've heard of getting different tune when you move to a different state, but I was wondering if a differetn tune was recommended for temperature changes?

I was on vacation last week. When I left, the temps were in the mid 100s. When I got back, the temps were in the mid 60s.
I thought the colder weather would make my car run better, but it ran like crap last night...bogging down alot.
It ran fine this morning, so it was probly just from sitting for a week, and me messing with my gauges last night, but I was wondering how everyone felt about differnt tunes in different weather.

Also, would it be better to tune in colder weather or hotter weather?
I would imagine colder would be preferable, but it's usually hotter here more often then it is colder.

 

yes, it's a very good idea to have different tunes for different weather. as it gets colder the air becomes more dense. this will create a need for added fuel. it's also possible that boost will increase as well.

monitor AFR's and adjust back to proper settings

 

watching.....here in ny it goes from 90's in the summer to below freezing in the winter lol

 

meaty u live in vegas, shoosh. lol

 

just last week when the temp drop from 95 - 60 in LA and i turned the car on in the morning, my rpm just up to 3k. wtf? i started driving and when i came to stop sign, my car just shut down. i was like wtf? i turned it back on and it was fine ever since.

 

This is very tru ur car will run like crap, if your on a winter tune and its summer time, i think it is very important to get a tune at least 2wice a year if u want it to run like a champ. And if u say you dont have the money for a 175$ tune twice a year then sell the car cause to play hard u got to pay hard.

 

hmm watching this one, the temp is not too extreme here, very rarely it hits 30s, 50s average winter but 95-100 summer not sure if im gonna be ok with one tune

 

Sounds good.
So do you all think the colder weather tune will run better then the hotter weather tune in their respective climates?

 

8 days ago it was 113 degrees.

today it was 67 when i woke up with a high of 78

 

I drove my car in the winter maybe a hand full of times with the unichip from turbonetics. I did get boost spikes but my afr's seemed to be ok. We get the really really cold winters and max mid 90 summers. Thankfully with the Hydra EMS is reads the air temp and autotunes depending on the reading. Piggybacks on the other hand do need retuning for colder or ever higher altitude climates.

My car has never ran better when its about 65-70. It loves those temps.

 

yeah i know vegas temperature. im there twice a month. you dont know what to wear. lol you wear shorts drive to vegas, its cold. you wears a sweater, drive to vegas, its fcukin hot.

 

us vegas wear everything and slowly shed as the weather changes. hahah

wait so that means i need two tunes?

 

OK, so we can see the benefits of 2 tunes. My car (with CEL cleared) is actually running great in the slightly colder weather. So here is the next question:

If you only had one tune, would it be better to tune in the heat and drive it in the winter, or tune in the cold and drive it during the summer?

I would say in vegas, since it's hotter longer then colder that a summer tune would be better year round.
But for the sake of argument, let's say the months are equally 6 months at 50degrees and 6 months at 100degrees.

 

Usually in colder weather u will see more boost, therefore it will run leaner... If you have a fancy boost controller that is set at a traget boost, u wont have that problem.
If you have a piggyback i would sugest getting a boost pressure sensor (like the e-manage one) which scales the tune according to the boost, instead of rpm's. That also allows you to have a perfect tune for whatever boost you set it at. Like i just had my car tuned for 10psi, but any psi i run under that the tune is the same.

 

Well, that would explain why my car is running fine, since I have the AEM Tru Boost boost controller set to 5psi, and my AEM F/IC has a boost sensor on it.

But if we run leaner in colder weather, i would imagine getting a cold weather tune and driving it year round would mean less boost, less power, but safer, richer AFRs in the summer, right?

 

how did u set ur AEM Tru boost to a certain psi?? Mine goes by duty cycle. You can set the overboost alarm to a certain psi though.. Is there a new one out?? I think the Apexi one has target boost though.

 

I highly recommend a retune if you experience temp changes of 30 degrees or more on the regular.

 

Ummm...I don't know. I didn't set it up...my tuner did.
I just assumed that a boost controller would controll boost. Isn't that what it does?
Say it's set for 5psi, then when your pressure goes over 5psi, it opens the wastegate to let everything else out so you don't boost past 5psi.
Please correct me if I'm wrong.

 

With the Tru-boost u don't type in a certain psi u want. You adjust the duty cycle, which changes boost. like on my Turbo, wastegate perssure is around 5psi, at 18% duty cycle im about 7psi. at 90% duty cycle you are basically almost maxing out the turbo's capability, which on mine is around 15psi.
So u set the duty cycle to get the desired boost, but the boost still changes with air density and temperature.
With the boost pressure sensor, it varies the tune according to the boost u r seeing, but u have to have it tuned that way.