| || ||Thread Tools||Search this Thread|
|14th November 2007, 21:33||#3|
Senior - BHPian
Join Date: Mar 2006
Location: San Antonio, TX
Thanked: 222 Times
I would always prefer a CARB engine. But since all cars are MPFI now, we dont have a choice.
Even in a MPFI car, I have understood that open loop or CARB type LPG installation is best.
|14th November 2007, 22:59||#4|
Join Date: Feb 2006
Location: New Delhi
Thanked: 14 Times
Less complications involved since Carb engines essentially don't have Sensors and ECU's, but some which do still do not Map the variations of Lamda O2 readings, Air Intake etc etc. But Def not recommended, neither Safe since the fuel supply is not electronically controlled, plus the Lack of O2 readings cannot say the mixture is Lean or Rich, Depends on Excessive Manual Tuning.
However I have heard that Older Padmini and NE 118( Taxi's) running in Mumbai and Pune on Carb systems have LPG or CNG kits.
MPFI engines better suited since the Sensor assist in Tuning the CNG-Air Ratio for a Lean MIX, Also in an MPFI Car the Emmulator shuts the MPFI System and Emmulates the Signal to the ECU-So Safety of only Gas or Only Petrol Modes.
Closed loops are best,since they involve auto mapping the Lamda Readings and adjusting the CNG ratio based with a Stepper and Lamda ECU.
Open Loop are Semi Automatic systems,which need periodic adjustments to control CNG Ratio.
Last edited by wolfinstein : 14th November 2007 at 23:12.
|15th November 2007, 10:13||#5|
Distinguished - BHPian
Join Date: Jul 2007
Thanked: 3,452 Times
I only know from experience:
m800 open loop cng (97 carb)
indica xeta closed loop cng. (06 dec mpfi)
m800 was a bullock cart on cng. xeta is just as peppy as normal - very little feeling that you're driving a "gas" vehicle!
mpfi+lambda sensor is the way to go.
|15th November 2007, 23:06||#6|
Join Date: Mar 2007
Thanked: 5 Times
Exactly phamilyman - I'm installed CNG in my newly purchased Wagon R (April 07) during September. The Kit is closed loop, and the car is behaving jus as normal as a petrol vehicle. Difficult to guess that it is running on gas....! for MPFI+Closed loop kit.
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Carb/MPFI - Which is having longer engine life ?||mithun||Technical Stuff||47||10th October 2007 01:58|
|99'ZEN carb to ZEN mpfi....||Balram||Modifications & Accessories||17||10th December 2006 09:04|
|carb or mpfi? which gives more power?||iceman91||Technical Stuff||18||5th April 2005 10:48|
|DO MPFI cars have CARB's||kakx||Technical Stuff||9||25th April 2004 00:54|