# just wanted to do a couple dyno pulls (JR TUNE INSIDE)

**URL:** <https://forums.speedlife.net/t/just-wanted-to-do-a-couple-dyno-pulls-jr-tune-inside/254252>\
**Category:** Shift518 Automotive\
**Created:** [August 31, 2010, 4:43pm UTC](https://forums.speedlife.net/t/just-wanted-to-do-a-couple-dyno-pulls-jr-tune-inside/254252 "2010-08-31T16:43:42Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![Alpine](https://avatars.discourse-cdn.com/v4/letter/a/4da419/32.png) [@Alpine](https://forums.speedlife.net/u/Alpine)\
**Post date:** [August 31, 2010, 7:43pm UTC](https://forums.speedlife.net/t/just-wanted-to-do-a-couple-dyno-pulls-jr-tune-inside/254252/16 "2010-08-31T19:43:13Z")

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> [@V \> Saleen Mustang](https://forums.speedlife.net/t/v-saleen-mustang/34659/30):
>
> on a fuel injected car it dont matter if its dyno,s in the middle of winter or 90 deg … the comp will make the changes needed unless the tune if fucked . thats why all cars that are injected have a air intake temp sensor

It really depends on the car then, I guess. Normal driving might (and should) be fine if the o2 sensors are ok, but the P.E. fueling curve isn’t affected by temperature changes. Doing WOT blasts down the highway in the middle of winter on a summer tune is a race against time (and a melted piston or two).

The reason I say that is because (for example) a car that’s commanding an 11.7:1 AFR at WOT may be OK in the summertime and not experience any knock or lean symptoms, but in the winter the cylinder airmass is a lot more dense. You really need to add fuel to the wot tables in order to be safe in the cold weather.

Running lean up top when it’s cold is never a good thing, lol.

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