More on squeezing a supercharged lsa for every last 725 hp

To show just how easy it is to pick up hundreds of horsepower in a factory boosted application, in Part 1 of this story we teamed up with the School of Automotive Machinists and Technology to wring every last air molecule we could out of a Chevrolet Performance LSA crate engine. C gastritis im antrum After recording baseline numbers of 569 horsepower on SAM Tech’s SuperFlow engine dyno, we embarked on a long series of bolt-on mods by attacking the most easily accessible external components first, then working inward. Grade 9 static electricity quiz The idea was to replicate the natural sequence of modifications as if the engine was bolted to a car’s framerails. O gastronomo The game plan called for bolting up a cold-air induction system and some long-tube headers before digging deeper with a 2.5-inch blower pulley, a Weapon-X ported blower snout and throttle body, an ATI 10-percent overdrive crank pulley, and DeatschWerks 1,500cc fuel injectors.

The results were downright staggering. Gas in texas Horsepower topped out at 725, while torque jumped to 736 lb-ft. Electricity vampires That represented a 156hp gain over the baseline figures. Electricity and magnetism ppt Not too shabby at all for a few simple bolt-ons. Electricity production in china For the next round of dyno thrashing, the only items left on the agenda were swapping out the cam to take advantage of the additional airflow, and searching for a few extra ponies by diving deeper into the fuel and timing maps. Electricity dance moms full episode While this may seem rather straightforward on the surface, as SAM Tech clearly demonstrated, it’s much more complicated than meets the eye. Gas appliance manufacturers association Once the headers finally cooled back down the room temperature, the results were just as impressive as from the first phase of testing: an additional 99 hp from a cam swap, ported lower intake manifold, and EFI tuning.

Although the hp gains from the first round of LSA testing were impressive, SAM Tech Instructor Chris Bennett knew that uneven cylinder-to-cylinder airflow distribution was leaving some ponies on the table. Gas prices going up 2016 This uneven distribution became far more detrimental as boost pressure increased. Electricity generation by source “On EFI engines with forward-facing throttle bodies the back cylinders (No. Gas in oil pressure washer 7 and No. Origin electricity login 8) usually run leaner than the rest of the motor. British gas jokes Sometimes you can design an intake manifold to compensate, but factory manifold designs are usually compromised by packaging considerations,” Bennett explains.

This puts tuners in an unenviable position of tuning for the weakest cylinder, which ultimately compromises power output. Power vocabulary words “Having wideband oxygen sensors mounted in each header primary allows us to monitor the air/fuel ratio of each cylinder. Y gasset For a forced-induction engine like the LSA, our target air/fuel ratio is 11.9 to 12.5:1,” says Bennett. 5 gases that come from car emissions “The back cylinders were running about 0.7 points leaner than the rest of the motor. Gas in back shoulder With the stock computer, we had raise the air/fuel ratio across the board, which means that the rest of the cylinders were now running too rich. Power definition physics electricity If you can’t change the tune from cylinder to cylinder, the leanest cylinder always limits how aggressive you can get with the tune because it’s the most sensitive to timing.”

Inspecting the spark plugs revealed that the rear cylinders were not just running the leanest, but also the hottest. Electricity test physics Instead of settling for an overly rich tune as a means of compensating for the lean cylinders, SAM Tech opted for a more practical solution. Electricity in india voltage “The Holley Dominator EFI system allows adjusting the air/fuel ratio and timing of each cylinder individually. Gas near me now Once we hooked it up, we were able add more fuel to the back cylinders to cool them off,” Bennett recounts. Gas pump emoji “Cooling off the hot cylinders and pulling back the timing 1.5 degrees in those cylinders, allowed us to put more timing advance into the rest of the motor. Gas in oil tank These tuning changes resulted in a 20 hp increase, bringing the total to 745. Npower electricity meter reading That’s a considerable increase.”

With the tuning squared away, SAM Tech swapped out stock lower intake manifold for a ported unit from Weapon-X. Electricity per kwh calculator This simple change bumped output up an additional 20 hp. K electric share price forecast With total hp now standing at 765, SAM Tech moved into the final phase of testing by swapping out the cam.

A blower cam is a blower cam, right? Not exactly. Power outage houston zip code Both centrifugal and positive displacement blowers require additional cam duration to complement the increase in airflow they provide, as well as relatively wide lobe-separation angles to prevent the intake charge from leaking out the exhaust valve. Electricity origin However, sometimes slightly altering camshaft design can further complement the different ways that each style of blower goes about producing boost. Electricity in water Positive displacement blowers tend to produce boost early, with efficiency falling off at high rpm. Electricity word search In contrast, centrifugal blowers are lazy at low rpm, yet pile on the boost at high rpm.

Consequently, Comp Cams offers different camshaft grinds for positive displacement and centrifugal supercharger applications. Electricity experiments for preschoolers “The idea is to tailor the torque curve of the engine to the supercharger’s boost curve. Electricity and magnetism review Positive displacement blowers can struggle with inefficiency at high rpm, so we add more intake duration to help counter this effect,” Billy Godbold of Comp Cams explains. Electricity bill nye “Centrifugal units are almost the exact opposite. O goshi They don’t make much boost at low rpm, so we close the intake valve earlier to make more cylinder pressure and power. Electricity outage houston These units are ultra-efficient and keep pulling at high rpm as long as we provide enough exhaust duration.”

For LS applications, Comp offers two very similar, yet slightly different, camshafts precisely for this purpose. Gas vs electric stove The centrifugal blower grind (PN 54-477-11) checks in at 227/243-degrees of duration at 0.050, 0.614/0.624-inch lift and a 114-degree LSA. Gas news today The positive displacement blower grind (PN 54-467-11) measures in at 239/243-degrees of duration at 0.050, with 0.624/0.624-inch lift and a 114-degree LSA. C gastritis der antrumschleimhaut Both represent a big step up from the dinky 198/216-at-0.050 factory camshaft that picks the valves up just 0.492/0.480 inches. Static electricity review worksheet In theory, the differences in engine output between both of the Comp grinds should be subtle, but noticeable nonetheless. Gas stations in texas “You may only see a rather small change in output, probably less than 10 percent, at the far ends of the rpm range, but the trends would still be there,” Godbold surmises.

Of course, the big wildcard in the mix is the blower unit itself. E85 gas stations colorado While old-school 6-71 and 8-71 blowers can struggle to hit 50 percent adiabatic efficiency (a ratio of the ideal amount of work required to compress the air to the actual amount of work required to compress the air, or efficiency with which work is done), today’s positive displacement units improve upon that mark dramatically. Gas approximation Eaton claims that its sixth-generation supercharger units used on the LSA are 76 percent efficient. Mafia 2 gas meter That is just as good as many centrifugal superchargers on the market. 1 unit electricity cost in gujarat Eaton credits this bump in efficiency to a revised twin four-lobe rotor design that features a helix angle of 160 degrees intended to smooth out airflow while reducing drag. Electricity reading comprehension In contrast, the company’s fifth-generation rotors use 60 degrees of twist.

Given the enhanced efficiency of the sixth-generation Eaton blower, the Comp Cams team predicted that our LSA might react more like a centrifugal supercharged engine. P gaskell They were right. C gastronomie brignais Both camshafts produced 824 peak horsepower at 6,500 rpm, but the smaller cam posted a 5-7hp advantage throughout the entire rpm range. Gas kansas “A bigger blower that builds boost very early may have liked the bigger cam, but that small, super-efficient factory LSA blower reacted more like your typical centrifugal blower,” Godbold explains.

As expected, the results were subtle yet noticeable. Gas efficient cars 2015 Ultimately, the additional cam duration and lift dramatically increased the LSA’s output. 76 gas card login Extending peak horsepower from 6,000 to 6,500 rpm also allowed spinning the blower faster, thus increasing boost to 13-14 psi. 2015 electricity increase That netted an 59-horsepower increase from the cam swap alone.

Throwing every bolt-on in the book at a Chevrolet Performance LSA, swapping cams, and fine-tuning the EFI calibration brought the final tally to 824 hp and 783 lb-ft of torque. 9gag instagram logo That’s more than enough to run toe-to-toe with a healthy 540 big-block, while also knocking down 20 mpg, in a much lighter and more compact package. Ideal gas questions Sometimes, the demands of evolution simply favor a smaller, more efficient beast.