3.9L Cummins 4BT in an '04 Tahoe

**filthyrich** · 06-07-2015

Thanks for all the great feedback, just playing with the pump now.
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**filthyrich** · 06-14-2015

**Rockwerx** · 06-16-2015

On one of the other diesel forums there is a lot of good information on how guys have modified their 4BT engines. Not sure what your goals are but it looks like you built your combination for fuel economy and to run clean out the exhaust pipe.

I believe you are on the right track after watching your videos. No substitute to trial and error fine tuning. I like your approach...a bit at a time. Also, you showed us some good tips to prepare for a run away engine.

Some of the guys have had a lot of success running a compound turbo setup on the 4BT. This should be the ultimate for fuel economy with the right combination. Might make it too complicated for a daily driver though. It all depends on how far you want to take it.

Good luck with your combination!

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