Im just curious if anyone has added F/I either turbo or SC doesnt matter to a Z with 3.9 Gears or a Tilton flywheel or both like in my case.....Im considering going this route but have not found anyone....Im just looking for driving impressions......And if my plan is STUPID....LOL

Started off N/A but have the need for boost......

 

IMO you'll get tired of the 3.9 gears quick.

 

I agree with nis350ztt about the gears. The clutch you should be good to go with, especially with people going with the ATS twin disc that is super light compared to stock.

 

Note you just can't use a Tilton flywheel alone. You need to use their clutches as well. The sinlge disk variety are inadequate for the TQ an FI VQ puts down. If you go Tilton, you'd need the hig end Carbon multi-disk variety.

My vote is for ATS twin at this point.

3.9 and FI are counter productive with TTs and somewhat less so with SCs. If anything you want to swap out 3.5 for 3.3 to make 1st gear more useful.

 

Just to let you know he already has the Tilton clutch and flywheel as well as the gears. So, I think buying the ATS clutch isn't really on his mind at this point. Although it is on mine

 

I have a clutch assembly that will support 600HP and it is a DUAL disk setup......The clucth I have is easier to drive but only supports a little more than 300WHP...

 

I guess ill just drive around with it on a lower boost setting and when I tear apart the rear in install a LSD I may put something else in....But who knows I may like it

 

I read feedback in another thread about this. It seems the 3.9 gear is too short for F/I. You have traction issues in 1st and 2nd gear about all the time, and you need to shift like a son-of-a-gun during spirited driving to keep from bumping off of the rev limiter. In fact, some folks are trading their stock Z gear (3.5?) for the taller 5AT G35 gear (3.3) to help alleviate that problem.

 

Start saving for tires.

 

I only get about 4000 miles right now...I have switched to Kumho MX cause they are cheaper to replace every few months.....

 

But wouldnt driving with 350WHP and these gears feel just like driving a Z with say for example 400WHP???? Its all down to ratio's right????

When you have a crap ton of power you need to shift quick anyway...Im not to concerned with MPH anyways......

Issues I will have in 1st and 2nd can be corrected with a LSD upgrade and kick a$$ tires....right?????

Input anyone?????
I just wanted my Z to feel like it had more power but in all reality maybe have the motor last longer because I dont have to boost as high with these gears.....

 

I don't have or have had the 3.9 but did have the stock 3.5 and went to the AT 3.3 and it made 1st and 2nd much more useful. I can only imagine how fast 1st and 2nd will go if you have FI and 3.9, with the 3.5 I used to bounce off the rev limiter constantly.

And if you do any 1/4 mile stuff it will probably hurt you as with the 3.3 you can go to the finish in 4th gear and save a shift.

 

Is your cruise control happy with the 3.3 swap?

 

No it isn't, as mentioned on the other thread it wont stay engaged.

 

So you believe that the loss of acceleration you got from changing a 3.53 to a 3.3 was worth it????

You may not have to shift as much but its like losing 30WHP....

 

If you stepped up the power to 430WHP wont you encounter the same problem you had before.....Bumping off the REV limiter????

 

You do not feel any loss in acceleration trust me once the boost kicks in it is great, and on highway runs I have done against an APS kit I have held my own and get the edge once 110 hits and they have to shift and I keep going.

 

I doubt it but imagine how it would be with a 3.9.

 

Initially I planned on staying N/A but then all you F/I owners made me an my Z feel inadiquate......

The only reason im going Turbo is because hopefully the LAG will help me in my launch.....

Worst case I guess Ill change things back....I dont plan on 400WHP as of right now..... but you never know.....

Hopefully the physics of Power/ Gearing and traction will prevail...LOL I dont care about what gear ends with this or that MPH....

I care about the acceleration curve......better acceleration with less WHP because of the shorter gears seems better in theory.....

Only time will tell though.... I could launch 2nd gear right.....

 

Well, give F/I a try with your 3.9 gear. The proof will be in the pudding.

Your situation is not unlike the guy who invested in new headers, which really helped his N/A performance. Then he went with a twin-turbo system, which came with new exhaust manifolds. The benefits of the new headers for N/A, unfortunately, did not transfer to his new TT set-up. But they were fun while they lasted!