Whipple users and racing at various altitudes

96gt4.6

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I'm getting ready to run Rocky Mountain Race Week, and wanted to see if there are any experienced Whipple Tune users that have ran these cars up on the mountain.

We'll be racing in Pueblo/Denver, then back here in Kansas. My only real concern, is i'm not sure how the car will respond to going up to altitude and making passes. Aside from losing a little boost that is due to the thinner air (I do plan on dropping 1 or 2 pulley sizes if necessary to say in my class E/T range).

The Whipple tune has been beyond awesome for 2 years now. Driveability is great, and no issues with the tune whatsoever. I'm sure the tune is calibrated for both sea level, as well as at altitude, as the kits could be sold to either market......and I have not reached out to Whipple just yet to clarify. Just trying to cover any surprises that may crop up with tuning issues ahead of time, rather than fight them at the time.





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engineermike

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The calibration will not offset reduced air density as well as I would like. The MAF will read less air flow and fuel flow will automatically be adjusted to match. However, at least in the ones I’ve looked at, the spark will not automatically advance though it could. If it were me, I would log the MAF and/or Load data at normal altitude, then again at race altitude. You can then, with a simple calculation, swap the pulley to fully offset the reduction in Load.
 
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96gt4.6

96gt4.6

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I used to race in Pueblo...I'm now down near Wichita. Dustin told me for Pueblo & Denver's altitude (not density altitude) .25-.375 smaller pulley on the mountain compared to what I'd run here in KS.

Good luck!
Thank you sir! It ought to be a good time either way.

The car usually runs [email protected] here previously (all stock, 750HP Whipple it, 305's out back). I have since removed the cats, so i'm thinking it's around 11.1-11.3ish give/take now on 91. I'm planning on running in the 12.0 Class, so it has some headroom racing up on the mountain on this 3.750" pulley.

If you don't mind me asking, what kind of E/T reduction did you see coming from Pueblo to here with no changes? I'm curious as to how much the PD blower cars are affected with no changes.

Thank You!
 

jrsimon27

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this is a whipple gen2 stage 2 with fuel style return system hoosier drag radials pbd tune on e85.
3.50 pulley.

WhatsApp Image 2021-02-04 at 3.08.22 PM.jpeg
 
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96gt4.6

96gt4.6

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^ Where are you located/where was this ran done at?
 

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