GTM 370z supercharger 550bhp/400 ft of Torque: The Masterpiece

1slow370 · 03-16-2011, 04:47 AM

they don't run off back pressure, to much is still a bad thing as then you start to trap exhaust in the cylinder instead of more fresh air mixture. the breathing mechanics are complicated. basically what you want is enough duration and lift on the exhaust that the engine pumps out most of the exhaust gasses, but on our cars which are tuned for n/a the valve overlap between the exhaust and intake valves allows the now compressed air charge to escape with the exhaust before the valve closes. all that is really needed is to bump the intake cam timing backward to reduce the overlap but with vvel you have to do both or nothing or else you risk the valves hitting the piston due to the high lift.

gleonard · 08-26-2011, 03:57 PM

Quote:

Originally Posted by 1slow370

they don't run off back pressure, to much is still a bad thing as then you start to trap exhaust in the cylinder instead of more fresh air mixture. the breathing mechanics are complicated. basically what you want is enough duration and lift on the exhaust that the engine pumps out most of the exhaust gasses, but on our cars which are tuned for n/a the valve overlap between the exhaust and intake valves allows the now compressed air charge to escape with the exhaust before the valve closes. all that is really needed is to bump the intake cam timing backward to reduce the overlap but with vvel you have to do both or nothing or else you risk the valves hitting the piston due to the high lift.

sounds like you need new cam shafts all together with the cam lobes in different locations specifically customized for each individual car's set up.

darron · 08-27-2011, 05:06 AM

Quote:

Originally Posted by gleonard

sounds like you need new cam shafts all together with the cam lobes in different locations specifically customized for each individual car's set up.

Not with the 370z...the cams are essentialy tunable themselves just waiting on the good-ol-boys at GTM to finish crackin te system for it. CANT WAIT!!!

esfourteen · 08-27-2011, 09:04 PM

Quote:

Originally Posted by darron

Not with the 370z...the cams are essentialy tunable themselves just waiting on the good-ol-boys at GTM to finish crackin te system for it. CANT WAIT!!!

only the intake cam has VVEL

03-16-2011, 04:47 AM	#1 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,733 Drives: v8 74 260z ;) Rep Power: 7252	they don't run off back pressure, to much is still a bad thing as then you start to trap exhaust in the cylinder instead of more fresh air mixture. the breathing mechanics are complicated. basically what you want is enough duration and lift on the exhaust that the engine pumps out most of the exhaust gasses, but on our cars which are tuned for n/a the valve overlap between the exhaust and intake valves allows the now compressed air charge to escape with the exhaust before the valve closes. all that is really needed is to bump the intake cam timing backward to reduce the overlap but with vvel you have to do both or nothing or else you risk the valves hitting the piston due to the high lift. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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