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Old February 6th, 2018, 18:09   #6
CNGVW
 
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.
Smile

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
Quote:
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
www.DRVOLKS.com
bobtec@comcast.net

VW and Audi Master Technician and TDI Specialist. Bob has over 35 years of experience in the field, and is listed on TDIclub.com 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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