4.08 and boost

whoLEEoh · 09-27-2011, 10:51 PM

Is anyone running the 4.08 with a s/c or turbo? LMK how much of a pain it is please or if its good enough that i wont have to go back to stock gearing

Red__Zed · 09-27-2011, 10:53 PM

depends on what sort of FI system you are looking at.

For the most part, 4.08s are more than fine with any FI application on the Z.

B.A.Q · 09-28-2011, 01:56 AM

it wouldn't harm trying

esfourteen · 09-28-2011, 11:10 AM

with an SC, the lack of low end torque (compared to TT) would probably be ok with 4.08's. I think you would find 370+tq with 4.08's to be a handful with traction and running out of gear too quickly.

Z eliminator · 09-28-2011, 11:15 AM

That will be my set up 4.08 and a stage 2 GTM SC>
At the trackwith the MT 305 35 18 drag radials at 15 lbs of air should be no problems.

Z

NYBladeZ · 09-28-2011, 11:50 AM

Quote:

Originally Posted by esfourteen

with an SC, the lack of low end torque (compared to TT) would probably be ok with 4.08's. I think you would find 370+tq with 4.08's to be a handful with traction and running out of gear too quickly.

Doesn't the TT have the lack of low end torque albeit higher overall numbers? Running out of gearing is the issue I would have. I don't want to turn the Z into a one dimensional 1/4 mile warrior.

GZ3 · 09-28-2011, 11:54 AM

jesus thats aggresive gearing for FI

esfourteen · 09-28-2011, 12:01 PM

Quote:

Originally Posted by NYBladeZ

Doesn't the TT have the lack of low end torque albeit higher overall numbers? Running out of gearing is the issue I would have. I don't want to turn the Z into a one dimensional 1/4 mile warrior.

It depends on what you define as low end I suppose, the point is TT torque comes on like a rocket, a sudden surge in torque, the SC is linear. Here is the dyno for 10psi on the 28rs .64. 3000-3500 rpm is quite a ride.

tranceformer · 09-28-2011, 07:59 PM

I can't imagine the traction problems with twin turbos and 4.08 gears. I've already seen what happens with (good) street tires + twin turbos. It goes something like this:

1st gear = useless
2nd gear = sorta useless
3rd gear = traction but you're already doing 60+ mph in a 6MT 370Z

NYBladeZ · 09-29-2011, 12:32 AM

You limit your car to a quarter mile monster. Granted it will be a monster but I don't care for those limits.

samb03 · 10-05-2011, 12:02 AM

I always thought that a s/c built much more low end torque (idle) than a turbo which has to spool up to make power. You can size them to what every you want. If you got tiurbos small enough to spool up off idle than it would sufficate the top end.

Z eliminator · 10-05-2011, 08:07 AM

I hope that your right about the 1/4 mile monster.
Time will tell GTM stage 2, 7 AT , 4.08 gears.
shoudl = 11.? 1/4 mile times

jnaut · 10-05-2011, 08:27 AM

This is why it think there should be an option for even smaller turbo's. To assist the low end tq issues, plus I could see more road racers wanting this since there will be less tq snap @ the 3500 rpm spot making the car more drivable through the corners. twin gt28 are hugh turbo's. My gf's gti makes what it seems like full boost @ like 1800rpm huge low end tq but the trade off it a bit weak @ 7500 rpm. You street drive, where do you drive more in the rpm band 7500 or 1800? but horsepower sells parts...

As for the gears plus boost. on a S/C it would be great!! For the turbo its going to spin alot, but it will spin and accelerate due to having less rpm of the actual rim/tire.

Red__Zed · 10-05-2011, 08:27 AM

Quote:

Originally Posted by NYBladeZ

You limit your car to a quarter mile monster. Granted it will be a monster but I don't care for those limits.

Not really. Gearing is much more favorable to a road course. 4.08s are arguably tougher on the strip than anywhere else.

2theextreme · 10-05-2011, 08:36 AM

Quote:

Originally Posted by NYBladeZ

You limit your car to a quarter mile monster. Granted it will be a monster but I don't care for those limits.

Didn't you know.....

"I live my life a quarter mile at a time, nothing else matters. Not the mortgage, not the store, not the team and all their b*llshit. For those ten seconds or less.... I'm free"

09-27-2011, 10:51 PM	#1 (permalink)
whoLEEoh Premium Member Join Date: Oct 2010 Location: Miami,FL Posts: 647 Drives: 2010 370z NISMO Rep Power: 16	4.08 and boost Is anyone running the 4.08 with a s/c or turbo? LMK how much of a pain it is please or if its good enough that i wont have to go back to stock gearing __________________ 2013 Boss 302

09-28-2011, 01:56 AM	#3 (permalink)
B.A.Q Enthusiast Member Join Date: Feb 2011 Location: Phoenix,Az Posts: 302 Drives: Touring 370z Rep Power: 14	it wouldn't harm trying __________________ SOLD!! 09 370z Touring MT: GReddy Ti-C CBE - Berk HFC - Stillen 3G CAI '11 Mustang GT/CS 5.0 MT

09-28-2011, 11:10 AM	#4 (permalink)
esfourteen A True Z Fanatic Join Date: Mar 2010 Location: LI, NY Posts: 1,375 Drives: 40th TT Rep Power: 18	with an SC, the lack of low end torque (compared to TT) would probably be ok with 4.08's. I think you would find 370+tq with 4.08's to be a handful with traction and running out of gear too quickly. __________________ Build Thread \| GTM TT Install Thread \| Engine Build Thread

09-28-2011, 11:15 AM	#5 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	That will be my set up 4.08 and a stage 2 GTM SC> At the trackwith the MT 305 35 18 drag radials at 15 lbs of air should be no problems. Z __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

09-28-2011, 11:54 AM	#7 (permalink)
GZ3 A True Z Fanatic Join Date: Dec 2009 Location: SATX Posts: 3,296 Drives: Z Rep Power: 22	jesus thats aggresive gearing for FI __________________ 09 GT-R 12' 370Z 7AT HANDED DOWN 12'+13' 5.0 SOLD

09-27-2011, 10:53 PM	#2 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 120	depends on what sort of FI system you are looking at. For the most part, 4.08s are more than fine with any FI application on the Z.

09-28-2011, 07:59 PM	#9 (permalink)
tranceformer A True Z Fanatic Join Date: Nov 2008 Location: Palm Beach, FL Posts: 1,213 Drives: 2009 370Z PW 6MT Rep Power: 268	I can't imagine the traction problems with twin turbos and 4.08 gears. I've already seen what happens with (good) street tires + twin turbos. It goes something like this: 1st gear = useless 2nd gear = sorta useless 3rd gear = traction but you're already doing 60+ mph in a 6MT 370Z __________________ Ray 2009 370Z Base Sport 6MT / 12.860 @ 109.09mph / 1.921 60ft / street tires official 1/4 mile track times

09-29-2011, 12:32 AM	#10 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	You limit your car to a quarter mile monster. Granted it will be a monster but I don't care for those limits. __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

10-05-2011, 12:02 AM	#11 (permalink)
samb03 Base Member Join Date: Nov 2010 Location: western Oklahoma Posts: 164 Drives: Black Cherry Sport Rep Power: 15	I always thought that a s/c built much more low end torque (idle) than a turbo which has to spool up to make power. You can size them to what every you want. If you got tiurbos small enough to spool up off idle than it would sufficate the top end.

10-05-2011, 08:07 AM	#12 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	I hope that your right about the 1/4 mile monster. Time will tell GTM stage 2, 7 AT , 4.08 gears. shoudl = 11.? 1/4 mile times __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

10-05-2011, 08:27 AM	#13 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 18	This is why it think there should be an option for even smaller turbo's. To assist the low end tq issues, plus I could see more road racers wanting this since there will be less tq snap @ the 3500 rpm spot making the car more drivable through the corners. twin gt28 are hugh turbo's. My gf's gti makes what it seems like full boost @ like 1800rpm huge low end tq but the trade off it a bit weak @ 7500 rpm. You street drive, where do you drive more in the rpm band 7500 or 1800? but horsepower sells parts... As for the gears plus boost. on a S/C it would be great!! For the turbo its going to spin alot, but it will spin and accelerate due to having less rpm of the actual rim/tire. __________________ Best 1/4 mile 12.24 Best mph 114.5_______

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