Posted by farmer boy on November 07, 2012 at 13:58:10 from (66.209.49.50):
In Reply to: Re: True Horse Power posted by buickanddeere on November 07, 2012 at 10:13:26:
I never said that I (or anyone) needs a 400hp diesel. I simply said that HP for HP, a gas will not perform along side a diesel. You have repeatedly said that all that matters is HP, and I have given you two examples disproving this THEORY. According to you, I don't need a diesel to pull 26000lb through the mountains, a gas will outdo it anyways. Nothing about the 305 to 5.9 6bt comparsion is seat of my pants. Look at the speedometer up a hill and odometer when the truck is dead. The 305 is a stout engine, but it doesn't perform nearly as well as a 5.9. I'd dare say that a 5.9 ISB, maybe even a 6bt, would out do a mid decade GM6.0L. I have to be concerned about the high rpm required for a gas to perform. There is no gear available in the 50-65mph range in a 4l80e that gets you into the 5k rpm. Even 70mph with 4.1 rear is only 4650 rpm. That's 2nd gear which has no lockup which means you'll fry that tranny in short order if towing without additional coolers. The 6spd Allsion locks up in 2nd gear and up.I won't make a comparsion with the 6l80e, as it doesn't appear to have the durability of the 4l80e which holds up to everything a stock engine can throw at it(minus heat). I still maintain that even in their peak power bands, the gas won't perform compared to the diesel and I have proof(shown above) The Main thing that makes the 3.5 Eco Boost so good is the fact that it is a low displacement engine that with a small load, will operate without boost, giving it the mileage of a 3.5L with the added advantage of being direct inject. Add boost and mileage drops off to a number that is proportionate to the amount of air being consumed. It is unlikely that GM will use the 6.0 or 6.2 as a platform for their new DI engines. It will likely be a 4-5L engine with a turbo. Otherwise there is little advantage. I will state once again that HP for HP, a gas will fall behind a diesel in the event of maximum power being demanded. The only case where this isn't true is when a gas has comparable HP AND torque, such as the LB7 and the 8.1L BB gas. The diesel truck with a stack is completely unrelated to the conversation on power.
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