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Old February 6th, 2018, 18:09   #6
Join Date: Sep 2009
Location: Bob Mann Auto, 111 High St, Pembroke MA 02359
Fuel Economy: Built a 2002 TDI Jetta that got 120 mpg of diesel using a CNG blend.

Thank for the kind words TDI Master
Let's see one of my ALH street setup with a computer control system did for added HP and Torque red is with CNG first time on the dyno

This on the Ford truck 70% CNG 30% on one test
the cost of CNG at the time was $1.00 a GAL below is a3 pulls with 2 CNG/D one for max power and one forever day driving

I do not do any more system cost of CNG is too high got a bunch of systems and support stuff I will sell off
Originally Posted by TDIMeister View Post
Negative on running that high %age CNG/LPG, especially with the rudimentary controls to use it in a car and have it properly interact with the existing Diesel fuel injection system and ECU. 10-20% max as a performance enhancer, and I'm sure Bob Mann (CNGVW) will wax poetic about it so I need not say more about it here.
True dual-fuel (gas + pilot Diesel ignition) setups are far more complex and are seen more for truck and stationary engines, but even then are going more towards to mono-fuel natural gas / propane with spark ignition because recent advances have closed the torque and efficiency gaps but at far lower costs and much easier emission control.
Bob Mann

VW and Audi Master Technician and TDI Specialist. Bob has over 35 years of experience in the field, and is listed on as a trusted TDI Mechanic.
Bob is also known for his CNG conversions and is a consultant for Patrick Racing.

Last edited by CNGVW; February 6th, 2018 at 18:21.
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