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Originally Posted by FastCarFan
Very nice engineering. I am anxious to watch it all come together & to hear how it drives.
I'm curious, what will the LS1 horsepower be compared to the Porsche engine you took out (not sure which engine you had)? How does the weight of the LS1 compare to the original engine? I am guessing that you have raised the center of gravity with the V8 compared to the F6. Is that correct?
Keep posting!
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Below is taken from Toyjet's website. His car along with the guys from RH all state that the LS1 motor is in fact lighter. Considering that I have a smaller radiator and have traded out the stock starter and other parts for weight reduction I am guessing that my conversion will also be less weight. The truth will be in the ride height when I get her back on the ground, I have 19" wheels and it was a very close fit to the fenders when I had the 3.0SC motor. If it is heavier when I put her on all 4's the fender will hit the tires.
Here is the information from Toyjet
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The factory 1980 Porsche SC 3.0 liter engine is 178 hp @ 5600 rpm and the torque range is 175 ft/lbs @ 4200rpm. Top speed with stock 1980 porsche engine 139 mph. with 3.88 rear end gears.
The LS1 Corvette engine is 350 cubic inches (5.7 liter), 345 hp @ 5600 rpm, and have a torque range of 350 lb/ft. @ 4400rpm. The LS1 Corvette engine (equipped with a supercharger and 27 inch tall tires at the rear) will enable me to go 184 mph in fourth gear. However, with no roll cage, I limited myself to going 155mph. with a 240lb. witness in the passenger seat.
The quarter mile time ran thus far (11.94sec at 114) mph. was done with a conservative take off at the starting line because of the weak stock axles. (refer to my Custom page to see the actual quarter mile test and tune video of my first successful pass using stock axles at Houston Raceway Park). I now have a set of re-engineered axles that can easily hold up to the challenge of high torque and high horse power.
I weighed the 1980 911 3.0 SC engine and 2000 GM LS1 Corvette engine and this is what I found out: My fully dressed 1980 3.0 Porsche engine ready to install weighed 472 lbs. Factor in the weight of the oil in the 10 quart oil tank mounted at the rear of the vehicle needed to support the 3.0 engine, then your engine plus oil tank weight jumps up to 490. 5 lbs. at the rear of the vehicle.
(One gallon of oil is 7.4 lbs. Ten quarts is 2.5 gallons, 2.5 x 7.4 = 18.5lbs. 18.5 lbs. + 472 lbs. = 490.5 lbs.)
A fully dressed 2000 LS1 Corvette engine ready to install with the engine computer and wire harness, complete exhaust system, engine mounting brackets, AC compressor, alternator, custom water pump adapter, transmission adapter plate and flywheel weighed 434 lbs. This is a rear vehicle weight savings of 56 lbs. over the Porsche 3.0 engine. I did not weigh the above engines with the transaxle or clutch assembly bolted to either engine. These parts would be used for both installations and their weights would obviously cancel
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