Tuning for altitude

Tech tips and how to's

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bikermike
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Location: Denver Area, CO
Model: 1500/1600
Year: Low Windshield-64-67.5

Tuning for altitude

Post by bikermike » Tue Feb 05, 2019 9:41 am

My Roadster and Z now reside at 5600 feet in Colorado. Since they came off the truck I haven’t had a chance to tune them. Previously they lived pretty close to sea level.

I expect my weekend cruises will be at higher elevations rather than lower.

Would going through the normal tuning procedure be sufficient or should I be looking at different needles for the SUs?

Any other advice for altitude?

Thanks.
-Mike
1967.5 SPL311
1972 240z / L28
2003 BMW 525i Touring

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keith0alan
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Re: Tuning for altitude

Post by keith0alan » Tue Feb 05, 2019 10:43 am

SUs compensate for altitude pretty well. Normal adjustment should do it.

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sfdaugherty
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Re: Tuning for altitude

Post by sfdaugherty » Tue Feb 05, 2019 12:42 pm

Ztherapy does have an option when rebuilding carbs for high altitude (over 6000 ft is the definition of high altitude if I recall). It is a needle change. I have a set of those still in the box from ztherapy waiting for the time to get my 68 2000 back on the road. My house is about 6100 ft and the altitude at the Albuquerque airport is about 5200 ft so I'm close to your altitude. I have run stock SUs at this altitude and, Keith is correct, the SUs compensate pretty well for altitude.
69 2000 SRL311-10088 (Type 4 Solexes)
68 SR20DE SPL311-18735 (SR20DE S15 Autech)
68 2000 SRL311-01179 (Waiting patiently for restoration)
68 1600 SPL311-20462 SOLD! After 41 years in the family

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bikermike
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Re: Tuning for altitude

Post by bikermike » Tue Feb 05, 2019 2:05 pm

Sounds good. Thank-you both.
-Mike
1967.5 SPL311
1972 240z / L28
2003 BMW 525i Touring