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Message: [QUOTE="Dieselboy., post: 1554235, member: 1232"] Altitude brings in a few issues with these old girls. There is a few MAPs we can tweak as far as the tuning side, but at the end of the day you are getting far less air in the mix to get a good efficient burn. Combine that with a much larger than stock injector/turbo and it makes it even worse. The 38R based turbos in my opinion are the worst. If this is going to be a common thing towing at alititude I suggest changin up turbochargers. I have said this many times before that no dropin can do everything a properly sized T4 kit can do and still stand by it. In my opinion the best drop in on the market is KCs 63mm charger as the factory exhaust housing/wheel will always be the restriction. Ive done many live tuning sessions where you can see how much faster a T4 charger comes to life and still out shines it on the top end. Alot of people say that the T4 kits are only benficial when big power goals are set. And I disagree, the T4 charger gives you a much broader powerband and frees up usable RPM. You can fudge timing tables to help things, but its margionally different, as lets face it. To get this side of things nailed down a said tuner would need to be live tuning in that exact situation. And lets face it, unless it was our own truck no one is gonna wanna pay for a session to go through and entire mountain pass/return trip. You could try having one of the two guys mentioned play with the SOI tables and or manipulate the PW table. But sometimes subtracting fuel makes things worse. [/QUOTE]

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