The slower Z had a passenger. That will make a difference. Neither car had a very good driver, that will definitely make a difference. There are too many variables for the video to mean anything.

With that said, I'm not a big fan of a shorter FD in the Z. First gear is already too short, a shorter FD just makes it worse. Stock Zs are geared well as is. Not to mention if you start adding significant power, you definitely won't want shorter gears. I would even take a measly 5-10hp over shorter gears. JMO.

 

Arg. You are now the second person to tell me not to get them. :-P
Guess I'll just wait a while till more people try em out..

 

I'm the guy in the video that's beating the Z with the final drive. I've driven the car with the 3.91, and it doesn't seem faster AT ALL than my car. I believe the 19 inch rims and the Big Brake kit on the Z that lost made a huge difference ... Also, I'm a pretty good driver on top of that.

 

The only reason I was knocking your driving was the second run where it took the better part of an entire second for your clutch to engage. From the exhaust note and the acceleration it's pretty obvious you didn't get a quick and solid engagement. Why is that?

I'm a little more curious now. Did you have all the mods in your sig at the time of the vid? Were the bigger wheels, bbk, and shorter FD his only mods?

 

That's what I'd like to know. If you're comparing a car with end to end airflow mods, underdrive pulley and lightweight flywheel / clutch to a car with nothing more than shorter gearing and a popcharger, particularly if its has more unsprung weight in larger wheels and a BBK plus the additional weight of a passenger, I don't think there's much surprise the he lost.

Shorter gearing is not the end all modification. Through the principles of torque multiplication, it can feel like it improves your power by 8-10%. But a car that is lighter, with more power can still be faster, even if it doesn't have the gearing advantage.

Given two vehicles that are identical other than gearing, the shorter gearing will accelerate more quickly. But I don't think the cars in the video were really that close to begin with.

 

In the video, I'm the better driver. I win every race. The car that is being silver car that pulls so hard is my car. The other car has FD, 19 inch rims, and BBk. He told me the 19 inch rims and BBK really slowed him down. As far as my driving goes in the video ... I really don't make any mistakes.

In the video, the only mods I have on the car are: HKS exhaust and Popcharger. Thats it, none of my current mods are seen in that video. Soon, though, I'll post another video after I get UtEC tuned, and I'll race him again and show you by how much I beat him then. Otherwise, in the video, the only advantage my car has is that it is lighter.

 

I'm just in disbelief that in-gear acceleration would be worse for the guy with 3.9 FD.. I mean, especially if you only had the exhaust and popcharger. Do the 19's and big brakes make THAT much of a difference??
And in-gear acceleration doesn't really have to do with driver.. so it can't be the driver..

 

If you're talking an additional 200-300 lbs in the cabin and 50-60 lbs of unspring weight, that will make a very noticable difference in acceleration times between 2 cars.

 

I love my 3.9 FD. It works very well with NA mods like I have. I wouldn't recommend it for FI though.

First gear is short in the Z and the 3.9 FD makes it shorter. I often start out in second when I am just driving around. However the 3.9 makes a big difference in the way the car accelerates, especially when you are already in motion.

Overall I think it is one of the best bangs for the buck in a NA car. I have a friend with on 05 Z who only has an intake and the 3.9 FD (and 17" stock wheels). His car is almost as fast as mine from a stand still. Mine is faster still when we accelerate from a roll. I also have an ECU reflash with a higher rev limiter. I think that helps if you have the 3.9 FD. The higher reving 06 motor would probably benefit from the 3.9 FD too.

 

If talking about the Technosquare reflash, is revving up to 7500rpm's bad for the rev-up engine?

 

Can someone confirm for me that you do/don't lose cruise control with these gears......it was stated in another thread that the gears effect how cruise control works and essentially make it non-operable.

thanks.

 

if you have an AT car you lose the cruise, if you have a manual car cruise remains fully functional

 

Just out of curiousity, what type of rear-end lube(ha hah ha) should we be using with these 3.9 FD's? Anything with more protection than stock?

 

nothing special is needed

 

Great Thanks!