4.08 FD difference?

tranceformer · 02-18-2014, 10:09 PM

The 4.08's help with the 1/4 mile time but it takes some adjustments to really get the most out of it. Launching was slightly different and took a few passes to find the right sweet spot again. Also the faster rev'ing of the engine requires some adjusting for gear changes. I found myself shifting too soon the first several passes and netting a lower trap speed than with stock gears. Sticky tires are a must, especially with the upgraded gears.

I can't really say exactly how much ET and trap speed was attributed to the gears because of the different mods I've done. But I'll say this much:

stock (on a really good night): 13.1 @ 105 mph w/ 1.89 60ft
4.08's + a few bolt-on's (on a warm night) = 12.8 @ 109 mph w/ 1.92 60ft

With that said, I like the 4.08's more for street driving than for 1/4 mile racing. The really wake up the car, makes it way more fun to run through the gears.

JC671 · 02-18-2014, 10:52 PM

Quote:

Originally Posted by tranceformer

The 4.08's help with the 1/4 mile time but it takes some adjustments to really get the most out of it. Launching was slightly different and took a few passes to find the right sweet spot again. Also the faster rev'ing of the engine requires some adjusting for gear changes. I found myself shifting too soon the first several passes and netting a lower trap speed than with stock gears. Sticky tires are a must, especially with the upgraded gears.

I can't really say exactly how much ET and trap speed was attributed to the gears because of the different mods I've done. But I'll say this much:

stock (on a really good night): 13.1 @ 105 mph w/ 1.89 60ft
4.08's + a few bolt-on's (on a warm night) = 12.8 @ 109 mph w/ 1.92 60ft

With that said, I like the 4.08's more for street driving than for 1/4 mile racing. The really wake up the car, makes it way more fun to run through the gears.

Thanks for the info bro

that's really good stock times. Now I can see how much of a difference our track conditions affect out times here. What's the Density Altitude at the track? Best 60ft. I have able to put down is 1.7ft but with DRs. Really appreciate the feedback.

tranceformer · 02-18-2014, 11:47 PM

Quote:

Originally Posted by JC671

Thanks for the info bro

that's really good stock times. Now I can see how much of a difference our track conditions affect out times here. What's the Density Altitude at the track? Best 60ft. I have able to put down is 1.7ft but with DRs. Really appreciate the feedback.

When I ran the 13.1 the DA was about -400 (doesn't get much cooler than that down here in south Florida). And when I ran the 12.8 the DA was about 1000ft. During the summer time it can get up to 3000ft but I never like to unless it's below 2000.

I never did get a chance to run the car with all the mods on a really cool night. Maybe one of these winters I'll get back there...

The best 60ft I've ever got was 1.85 w/ street tires, never had the pleasure of running DR's or any special track tire.

JC671 · 02-19-2014, 12:02 AM

Quote:

Originally Posted by tranceformer

When I ran the 13.1 the DA was about -400 (doesn't get much cooler than that down here in south Florida). And when I ran the 12.8 the DA was about 1000ft. During the summer time it can get up to 3000ft but I never like to unless it's below 2000.

I never did get a chance to run the car with all the mods on a really cool night. Maybe one of these winters I'll get back there...

The best 60ft I've ever got was 1.85 w/ street tires, never had the pleasure of running DR's or any special track tire.

Wow really good conditions there. Our track condition, location, and elevation works against us.

02-18-2014, 10:09 PM	#16 (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	The 4.08's help with the 1/4 mile time but it takes some adjustments to really get the most out of it. Launching was slightly different and took a few passes to find the right sweet spot again. Also the faster rev'ing of the engine requires some adjusting for gear changes. I found myself shifting too soon the first several passes and netting a lower trap speed than with stock gears. Sticky tires are a must, especially with the upgraded gears. I can't really say exactly how much ET and trap speed was attributed to the gears because of the different mods I've done. But I'll say this much: stock (on a really good night): 13.1 @ 105 mph w/ 1.89 60ft 4.08's + a few bolt-on's (on a warm night) = 12.8 @ 109 mph w/ 1.92 60ft With that said, I like the 4.08's more for street driving than for 1/4 mile racing. The really wake up the car, makes it way more fun to run through the gears. JC671 and Tickwomp like this. __________________ Ray 2009 370Z Base Sport 6MT / 12.860 @ 109.09mph / 1.921 60ft / street tires official 1/4 mile track times

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