How much does cold/hot weather affect power?

[bills68camaro]

My 99.5 4WD welding rig has about 190K on it now. It's mostly stock with the exception of a 4" turbo back exhaust, Banks 6 gun, Banks Big Head wastegate, air intake system, IH bellow up-pipes & 33" tires. I have about an extra 2K LBS of equipment on it at all times so it weighs right about 10K LBS.

When the truck is cold, it seems to have quite a bit more power than after it's at normal temp. The turbo spools up & holds boost faster/longer & there's no surge/flutter/shutter or whatever noise when the truck upshifts. Then when it warms up, the turbo system is very noisy during upshifts & feels like it falls on it's face after the upshift. When pulling a grade under moderate to heavy throttle I can hear the flutter sound almost constantly until I let off. It will produce around 26 LBS boost max under full throttle. Any ideas? Thanks.

And please have mercy on me with the abbreviations of parts. I'm not that diesel savvy. Yet!

[timmyboy76]

change to 5w-40 synth oil and either a wicked wheel or a ported compressor housing..

Riffraff Diesel: Borg Warner Anti-Surge Compressor Wheel

Riffraff Diesel: ATS Ported Compressor Housing

Or go to bigger exhaust housing...Riffraff Diesel: Garrett 1.0 A/R Wastegated Exhaust Housing

You do not want surge happening. Thats a disaster waiting..(ask me how).

[jesilvas]

None of that explains the "more power when cold" issue. You need to find out what fuel pressure is, ICP reading, and maybe more things.

[bills68camaro]

Thanks for the respones fellas. I read a little about the compressor wheel. seems like it's a hit or miss fix? The ported housing gets good reviews.

How do I get the ICP & fuel pressure readings? Take it to a shop?

I noticed the rubber 90 degree boots connecting the red & green plastic tubes to the wastegate are crusty & starting to crack.

[jesilvas]

Those boots and hoses are just for the wastegate vacuum actuating.