Maximizing Fuel Economy on the Cummins 6BT
#15
y is the ve more efficient??? does the timing compensate for rpm on the ve pumps or somthing???
---AutoMerged DoublePost---
hey i have heard of injectors that were supposed to increase mpg's
i talked to a guy once that said he took used injectors and honed them and shimmed them to 230 bar or somthing liked that and they were supposed to get better fuel economy and little bit better hp, he claimed with a 100 plate in stock location a 12v wouldnt even smoke
---AutoMerged DoublePost---
hey i have heard of injectors that were supposed to increase mpg's
i talked to a guy once that said he took used injectors and honed them and shimmed them to 230 bar or somthing liked that and they were supposed to get better fuel economy and little bit better hp, he claimed with a 100 plate in stock location a 12v wouldnt even smoke
Last edited by wes-cummins; 07-23-2010 at 10:46 PM. Reason: Automerged Doublepost
#16
imho the reason for the ve being more efficient is mostly due to it requiring less power just to turn the pump its self. rumor has it that a modified p-pump can take 50 hp to run. thats more than some small automobiles had in the first place!
as for 1400rpm @65mph, i have never proven this but i would suspect that this is almost too slow, have you ever checked the ecconomy at the same speed but lower gear so ud be at possibly 1600 or 1700? but the other stuff sounds good. also, and this is important and most times over looked but i have proven it on my truck, the factory intake pipe is too small on your '89 engine. take it off and look inside it sometime, both ends. how did they figure that was gonna flow enough air for 359 cubes. at no or low boost it barely flows enough air to keep the stock fuel setting from making smoke. i made one out of full 2-1/2" pipe and it made a huge difference on power and smoke on takeoff and between gears. also the turbo doesnt flow enough air especially at low boost. again look at the size of the hole it has to go through especially with the fins of the compressor wheel in it. you need an hx40 size compressor wheel, possibly a complete hx40 turbo. the factory first gen dodge ic doesnt flow enough air either, look for somethin a little bigger.
as for 1400rpm @65mph, i have never proven this but i would suspect that this is almost too slow, have you ever checked the ecconomy at the same speed but lower gear so ud be at possibly 1600 or 1700? but the other stuff sounds good. also, and this is important and most times over looked but i have proven it on my truck, the factory intake pipe is too small on your '89 engine. take it off and look inside it sometime, both ends. how did they figure that was gonna flow enough air for 359 cubes. at no or low boost it barely flows enough air to keep the stock fuel setting from making smoke. i made one out of full 2-1/2" pipe and it made a huge difference on power and smoke on takeoff and between gears. also the turbo doesnt flow enough air especially at low boost. again look at the size of the hole it has to go through especially with the fins of the compressor wheel in it. you need an hx40 size compressor wheel, possibly a complete hx40 turbo. the factory first gen dodge ic doesnt flow enough air either, look for somethin a little bigger.
#18
#20
Here’s my rpm’s at 65 mph.
5th gear = 2483
6th gear = 1837
Double = 1434
but the other stuff sounds good. also, and this is important and most times over looked but i have proven it on my truck, the factory intake pipe is too small on your '89 engine. take it off and look inside it sometime, both ends. how did they figure that was gonna flow enough air for 359 cubes. at no or low boost it barely flows enough air to keep the stock fuel setting from making smoke. i made one out of full 2-1/2" pipe and it made a huge difference on power and smoke on takeoff and between gears. also the turbo doesnt flow enough air especially at low boost. again look at the size of the hole it has to go through especially with the fins of the compressor wheel in it.