Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - 1982 Volvo 244 D6 with 2383ccm diesel engine

houseofdiesel · 04-21-2012, 11:24 PM

I love the sound of those old inline 6's, like a mini transport truck! Consider upgrading your injector nozzles to the 1.9d size or GTD ones, I have found a larger injector helps overall. Replace your rear diff with the lowest number possible (I am far removed from Volvos and don't remember the lowest one anymore), the lower the rpm the better. For sure remove the engine driven fan and add an electric one or install a relay and use the a/c fan if strong enough. Play with your injection pump timing, if the factory spec is 0.95mm lift try 1.05mm, if that works try 1.1 or 1.15mm the more advance the more mpg to a point, then the engine gets noisy you will develop an "ear" for it overtime, and pumps wear a bit internally too it helps compensate. If your oil consumption is that high try a thicker synthetic like 20w50, the thicker the oil the less it will burn. On some I have even added Lucas oil stabilizer (very thick goey stuff) it does reduce consumption on really tired diesels. Cetane booster/fuel conditioners/two stroke oil mix all help a small amount to keep things lubricated and don't hurt mpg, although being in europe you have quality fuel to begin with. Consider a ram air set up to get air into the engine, I am no specialist to that effect but for sure it will help just not sure if you want cowl induction, a big ugly hood scoop or just duct work from the front grill. Go with skinny tires and low rolling resistance compounds. Remove your exhaust-straight pipe all the way, seriously there could be 10kg of soot trapped in your exhaust pull it and try no muffler, if you cannot live with the sound get a free flowing muffler only nothing more. I loved the sound of my 1.6 D jetta with no muffler, it was loud but not loudest on the road nor droaning on the highway, it was straight all the way out back.
I did these things to a 1987 Jetta non turbo diesel, top speed went from 125km/h to 160, fuel range went from 900 to 1400kms on 55L it was great until the drivers seat fell out at 450000kms. I did not have to drive terrible slow to get great range either, 120km/h would result in 1250kms to a tank, slow down to 95 and get 1400.
The basics are let the engine breath both in and out, tune it well (timing and nozzles), lower the rpms, free up the demands (fan, tires etc)

04-21-2012, 11:24 PM	#21 (permalink)
houseofdiesel Diesel Lover Join Date: Apr 2012 Location: Kemptville, Ontario, Canada Posts: 15 pumpkin - '06 smart Fortwo Pure Cabrio Thanks: 0 Thanked 7 Times in 6 Posts	I love the sound of those old inline 6's, like a mini transport truck! Consider upgrading your injector nozzles to the 1.9d size or GTD ones, I have found a larger injector helps overall. Replace your rear diff with the lowest number possible (I am far removed from Volvos and don't remember the lowest one anymore), the lower the rpm the better. For sure remove the engine driven fan and add an electric one or install a relay and use the a/c fan if strong enough. Play with your injection pump timing, if the factory spec is 0.95mm lift try 1.05mm, if that works try 1.1 or 1.15mm the more advance the more mpg to a point, then the engine gets noisy you will develop an "ear" for it overtime, and pumps wear a bit internally too it helps compensate. If your oil consumption is that high try a thicker synthetic like 20w50, the thicker the oil the less it will burn. On some I have even added Lucas oil stabilizer (very thick goey stuff) it does reduce consumption on really tired diesels. Cetane booster/fuel conditioners/two stroke oil mix all help a small amount to keep things lubricated and don't hurt mpg, although being in europe you have quality fuel to begin with. Consider a ram air set up to get air into the engine, I am no specialist to that effect but for sure it will help just not sure if you want cowl induction, a big ugly hood scoop or just duct work from the front grill. Go with skinny tires and low rolling resistance compounds. Remove your exhaust-straight pipe all the way, seriously there could be 10kg of soot trapped in your exhaust pull it and try no muffler, if you cannot live with the sound get a free flowing muffler only nothing more. I loved the sound of my 1.6 D jetta with no muffler, it was loud but not loudest on the road nor droaning on the highway, it was straight all the way out back. I did these things to a 1987 Jetta non turbo diesel, top speed went from 125km/h to 160, fuel range went from 900 to 1400kms on 55L it was great until the drivers seat fell out at 450000kms. I did not have to drive terrible slow to get great range either, 120km/h would result in 1250kms to a tank, slow down to 95 and get 1400. The basics are let the engine breath both in and out, tune it well (timing and nozzles), lower the rpms, free up the demands (fan, tires etc)