High altitude adjustment

[ccasteel]

I've been considering a trip to Pueblo Motorsports Park in July. I've got family in Pueblo and figured I'd include a race weekend in the family get together. So far I've only raced at lower altitude midwest tracks. With PMP being almost 5000 feet, what adjustments, if any, do I need to make? I drive a 1st gen IT prepped Rx7.

[Greg Amy]

Since you're using a MAP-fed ECU, the ECU will adju....hmmmm, never mind....



You're probably gonna run rich, but short of spending some time on the dyno to re-jet you may be SOL. Do you have an AFR installed? If so, you could play with some smaller main jets between sessions to try and lean it out.

[joeg]

Think "Lean"

[howler]

You will be fine with the jetting you have. I race a Spec 7 and we are not allowed to change the jetting.
When you are out here stop by and say hi. I will be driving the #73 Spec 7 and my dad drives #28 ITA RX7.
Matt

[ccasteel]

Thanks for all the input. I think I'll see how it goes before changing anything. If need be, I'll be prepared with some smaller jets.

Matt, I will definitely look you guys up. What kind of numbers do you guys usually have in the IT group?

[howler]

Unfortunately our car counts have been down lately. We are currently getting 2-4 ITA cars. We are seeing 10 – 15 in the small bore group.