Dyno Tuesday, Predictions?
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- Peer Mediator
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With the throttle open, the pumping losses from those two pistons was virtually nil. Just like in a deactivated cylinder in an engine with DOD, the energy the engine puts into compressing the air on the compression stroke is returned on the power stroke. All the energy consumed is in moving the air from the TB to the tailpipe.crzyone wrote:Those pistons that were not firing were taking up huge power.
How much power do you think it would take to power an air compressor that spins at 6000rpm and puts out 200psi? That is a shit load of parasitic loss on 2 pistons. I bet they were sucking up 25+hp easy.
So, instead of sucking up 25+hp now they will be putting out around 70-75hp. I bet my base run will be 250+whp.
- crzyone
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I see what you are saying, more just pumping loss then anything. Depends on how much pressure remains in the cylinder when the exhaust port opens. Still takes more energy to compress the air than you get back from it expanding and pushing on the piston on the way down.
Ben, I can't chose the dates. They are booked through June and are just stuffing me in there to finish off my tune. Would be nice if it was a weekend and wasn't rushed. Still need to find a way to get an RPM signal to the dyno. They read pulses off a sparkplug, I might have to rig my coilpack somehow with spark plug wires on the rear bank just to get some torque numbers....
Ben, I can't chose the dates. They are booked through June and are just stuffing me in there to finish off my tune. Would be nice if it was a weekend and wasn't rushed. Still need to find a way to get an RPM signal to the dyno. They read pulses off a sparkplug, I might have to rig my coilpack somehow with spark plug wires on the rear bank just to get some torque numbers....
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Come again? The intake pulls from 14.7 psi, the exhaust pushes to 14.7 psi. The air actually gains energy in between as it absorbs heat from the engine, so pumping losses will be virtually nothing at WOT. The only difference in pressure comes from differences between intake close ABDC and exhaust open BBDC.crzyone wrote:Still takes more energy to compress the air than you get back from it expanding and pushing on the piston on the way down.
Part throttle is a different matter, because the pistons are trying to pull air against a mostly closed throttle plate... but then so are all the other cylinders in the engine...
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Seriously, every shop in the world can dyno an LS1. And if they can't, then it isn't a shop you should be going to. Just tell them to dyno it like it's an LS1.Shaun41178(2) wrote:coil on plug cars are so abundant now a days, the question is what do these dyno shops use to dyno these cars? Thats what they would then need to get to get a tach reading from your car.
88GT 3.4 DOHC Turbo
Gooch wrote:Way to go douche. You are like a one-man, fiero-destroying machine.
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No no, an LS1 does not have coil on plug.. it's coil-per cylinder. It still has spark plug wires.Aaron wrote:Seriously, every shop in the world can dyno an LS1. And if they can't, then it isn't a shop you should be going to. Just tell them to dyno it like it's an LS1.Shaun41178(2) wrote:coil on plug cars are so abundant now a days, the question is what do these dyno shops use to dyno these cars? Thats what they would then need to get to get a tach reading from your car.
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So, it doesn't look promising. The 2000+ N* is one of the few engines I know of that use this arangement, the other being the Shortstar.AFI Performance wrote:I have never heard of a pick up blanket?? I have both a traditional spark plug wire attachment for rpm pick up, as well as a special coil on plug wire attachment. The problem is not being able to find a wire to hook it to.
For example, on a mustang with COP I hook up to one of the two wires that goes into the coil.
Martin