Nissan 370Z Forum - View Single Post - GTM Performance Engineering: VQ37VHR Twin Supercharger System

chii370 · 05-13-2013, 12:21 PM

cams, crank, pistons, rods, fly wheel, valve train, block just to mention the motor. then sub supporting mods like clutch, and rear end. the tune is literally the ONLY thing holding me back from installing all of it myself and saving myself like 5-6k. thats a LOT of money ;( also, just to ask, what gear ratio have most of the FI builds been using? if im not mistaken the nismo is already like.... 3.7 or 3.8 something right? need to be taller than that? im not looking for this thing to go 200 mph, im looking for maximum torque and responsiveness, so i have to find a happy median. longer gears would take more advantage of the extra power yes, but shorter gears would make the available power easier for the engine to convert to mechanical power on the ground, hence "mechanical advantage" but i dont want them TOO short, or then it would so easily overpower itself it would be literally impossible to drive, and first and second gear would be like .5 nano seconds long before shift.

someone please remind me how a dyno calculates again? wouldnt having 4.08 gears technically allow your engine to more efficiently put "more" power on the ground, or does the calculation compensate for gear ratio? in my mind its an artificial way for the engine to help make up for torque. but im positive im wrong about that.

i miss the days you could just throw these parts in an engine, time the engine with a gun and your distributer, fiddle with your 4 barrol carb for a bit and BAM, engine tuned. computers made cars infinitely more complicated. better yes..... but not required. i could make that old "inferior tech" 302 run RINGS around a BUILT 370z motor with about 5-6 grand. and all i had to do to the rest of the car was....... absolutely nothing at all. the rear end, transmission could already hold its own. slap some big *** tires under the wells and you got yourself a bored and stroked 500 horse NA MONSTER that runs 11 second quarters. 302 is pushing it..... but point remains. tried to compare it as closely as possible to displacement. 302=5L to a 370z's 4.5L stroker.

05-13-2013, 12:21 PM	#307 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 16	cams, crank, pistons, rods, fly wheel, valve train, block just to mention the motor. then sub supporting mods like clutch, and rear end. the tune is literally the ONLY thing holding me back from installing all of it myself and saving myself like 5-6k. thats a LOT of money ;( also, just to ask, what gear ratio have most of the FI builds been using? if im not mistaken the nismo is already like.... 3.7 or 3.8 something right? need to be taller than that? im not looking for this thing to go 200 mph, im looking for maximum torque and responsiveness, so i have to find a happy median. longer gears would take more advantage of the extra power yes, but shorter gears would make the available power easier for the engine to convert to mechanical power on the ground, hence "mechanical advantage" but i dont want them TOO short, or then it would so easily overpower itself it would be literally impossible to drive, and first and second gear would be like .5 nano seconds long before shift. someone please remind me how a dyno calculates again? wouldnt having 4.08 gears technically allow your engine to more efficiently put "more" power on the ground, or does the calculation compensate for gear ratio? in my mind its an artificial way for the engine to help make up for torque. but im positive im wrong about that. i miss the days you could just throw these parts in an engine, time the engine with a gun and your distributer, fiddle with your 4 barrol carb for a bit and BAM, engine tuned. computers made cars infinitely more complicated. better yes..... but not required. i could make that old "inferior tech" 302 run RINGS around a BUILT 370z motor with about 5-6 grand. and all i had to do to the rest of the car was....... absolutely nothing at all. the rear end, transmission could already hold its own. slap some big *** tires under the wells and you got yourself a bored and stroked 500 horse NA MONSTER that runs 11 second quarters. 302 is pushing it..... but point remains. tried to compare it as closely as possible to displacement. 302=5L to a 370z's 4.5L stroker. Last edited by chii370; 05-13-2013 at 12:30 PM.