i wonder why no one has made gears yet. the 300zx had gears only a few years after it came out.

 

cause everyone has been cloaking the issue under the whole "you need to have mad skills yo and drag radials and up your boost some more if you want to go faster" thing

 

this was one of my main problems when I went FI, I was on my third transmission but it was mainly the synchros going.. I'm tough on a transmission so it'd be nice to have something strong that can take a beating.

 

Im thinking that the gear whine of the Dog gears would be similar to the loud high pitched whinning you get when you engage your cars reverse gear....If this is the case I cant imagine living with that freakin noise for all 7 gears on a daily basis. 1 noisy gear is more than enough. Try carrying on a conversation with that constant high pitched whine...You will be a axe murderer in less than a week, trust me. Although it would come in handy if you want to tune your girlfriend out .If it were a little more affordable Id deffinately go the GTM helical route...

 

I would think a T56 transplant (as an alternative) would cost less after all is said and done.

 

That would be very true. T56 is proven.

 

well if you guys end up wanting a T56, you might as well get the 3.9 final drive and just keep the Z's stock tranny and launch in 2nd gear - roughly the same mph and it'd be cheaper than fabbing a T56 to fit and you'd still shift only 3 times down the 1/4 mile

 

I like the idea of more gears that shorten over time. Ive always thought of that in my head while i spent 10 seconds in 3rd gear and then 15 seconds in 4th gear. If first gear lasted 5 seconds, 2nd 10 seconds, 3-5 10 seconds and then 6th as a huge O/D, the Z would be more of a blast to drive and maintain good mpg.

 

hell I'm going to whip out my forza motorsports on my xbox and try that gearing out on a FI Z and see how it does compared to the current gearing options available


btw, I'm sure everyone is familiar with this site since it's a sticky in the engine forum

http://www.f-body.org/gears/

 

You would want a built automatic for drag. Much cheaper too.

 

well according to Forza Motorsports, this set of gearing with the stock final drive worked the best yielding the best 0-60 and 0-100 time - not that a video game simulation really means a whole lot. Their dynocurves area really messed up on the Z. The turbo and supercharger curves look nothing like your typical Z dynos

anyway, these are the tweaked gear ratios

3.05
2.11
1.65
1.32
1.11
.94

 

Very interesting thread. What can be done with a 5at? I would like to change 3 & 4.

 

lol sentry, you'd need 1 more gear at .80 or .70 for half decent MPG, otherwise at 80mph you'd be at 3500rpm.

 

I have the 3.3FD from the auto and I like the gear ratio where its at except for 1st. If I could design it I'd make 1st taller, 2nd just a lil and leave the rest where they are. 7th gear would be nice to just cruise at 80-90mph at 2k. Right now at 80mph its 2700 or so.

I also heard the M45 has a different FD that bolts up, I think they are 3.1's, anyone have any info?

 

lol you want a million hp Z to go fast and you're worried about gas mileage?

 

M45 uses the 3.357 and the M35 uses the 3.538, both with the open diff. VLSD is not an option for those cars. The M35X uses the 3.692, but I'm not sure if that's a direct swap or not.

 

:-D I guess you're right, but 3500rpm at 80mph is rediculous. Different gears is more or less in call, like you said. 6th gear should remain untouched..

 

i dunno, one of my jeeps with a 5 speed hits 80mph in 5th (top) gear at 3500+rpms and it gets decent gas mileage though it doesn't have a million hp either

my Z with the 3.9 FD hits 80mph at around 3300 rpms in 6th gear and it's not super bad mileage IMO

I guess I don't start thinking a car gets bad freeway mileage until it's getting like 14mpg, but then again I didn't FI my Z for great highway gas mileage

 

This same FI ratio debate raged for more than 10 years in the honda scene while i was growing up.

Originally, I ran a hybrid gear setup in my b-series honda tranny. i actually used taller 1st and 2nd gears from an LS tranny and shorter 3,4,5 gears from a GSR tranny on my first high horsepower turbo honda drag car. i tried all the combinations over the years: ultra close gears in the b16 trans, ultra long gears in the LS trans, and even hybrid gears like mentioned above in which i would actually combine gearing from two different trannys.

The ultimate conclusion to the gear ratio debate in the honda world has become personal preference. Emphasis has been moved to gaining traction instead of messing with ratios.

For Z owners that drag race their cars, gearing is important for many reasons but it all comes down to the speed in which the car traps. With my hondas, i changed the ratios so many times because as my car trapped higher and higher i had to worry about my 4th -5th gear shift. i used to use longer gears to avoid having to shift into 5th before the line. however, once i had enough hp and was trapping much higher, i was shifting into 5th gear every run. At this point i decided to go with much shorter gears since i was forced to shift into 5th anyways.

Gear ratios are just one aspect of the total package when it comes to overall performace. They are a reflection of both the tune of the car and the preference of the driver. From personal experience and with traction issues addressed, shorter ratios (a.k.a. stock Z tranny ratios in this case) will be faster than long gears.

Personally, the thought of lengthening my 1st and 2nd gears turns me off. My plans with the Z involve keeping the stock ratios and reinforcing the internals to take higher revs. then its just time to practice,practice,practice once i start driving with the kind of hp and tq FI provides.

 

The Q has had a few FD ratio. I thought I saw a 3.1 on an older spec sheet, and 2.9 on the 07 http://autos.yahoo.com/newcars/infin....v7RZs4F?p=all

Pretty sure the Q uses the RE5R05A.