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Single vs twin turbos on my 7.3, the tow test settled it
I ran my 2002 F-250 with a single 66mm for about 14 months, then swapped to a compound setup with a 38mm and 71mm last fall. Pulling my 12k gooseneck up I-70 near Vail, the EGTs stayed under 1100 on the twins, but the single would spike past 1250 on the same grade with similar boost. The spool difference was the real kicker, twins start building boost around 1800 rpm instead of 2400, which made merging with a load way less stressful. Downside was the install time, took me a full weekend plus a Tuesday night fighting charge pipe routing near the passenger frame rail. Fuel economy on empty drop about 1.5 mpg, but I got that back in cooler oil temps. Anyone else run compounds and find the lag tradeoff worth it for daily driving or do you keep it simple with a single?
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danielb432mo ago
Man, I gotta disagree with you there. I ran compounds on my 7.3 for about a year and the added plumbing headaches just weren't worth it for how I drive. Sure, the low end spool was nice, but that 1.5 mpg hit and the extra time I spent fixing boost leaks made me go back to a decent single. To each their own, but I'll take the simpler setup and just downshift earlier on the big hills.
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danielb432mo ago
Wait til you've swapped a turbo on the side of the interstate in the rain, then tell me compounds are worth it.
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