Compensate for altitude?
 

Moving from sea level to Denver.


Contemplating a pulley switch (from OEM 2.5" to 2.3") to attempt to recoup some of the lost power.


Any other ideas I should be looking at? I don't want to tune.


Thanks.

We always recommend an ATI superdamper with overdrive lower rather than changing the upper and loosing belt traction.

We carry ATI if that helps.

The correction factor in Denver is about 1.20 - yes, that's a heap of HP loss sucking this thin air up here.

Most ideas to make up for that lost 115whp are: headers, throttle body, E85, S/C porting. And, most of those require a tune to get fueling right (if you already have fueling available).

Thanks for the reply. It's actually for the Blackwing. I can do everything on your list except the E85 without a tune. The Blackwing has OEM Wideband O2 sensors and a much faster ECU.



Is E85 avail in the Denver area? I'm down south in Parker.

You're going to lose 130 bhp or more on a stock LT4. You can't recover that unless you make some of the mods discussed here daily. An E85 Flex Fuel kit and a tune are probably the least expensive ways to regain power. You can spin your blower faster too but additional heat will be a problem.