I was just considering 3.91 final drive as a near future mod, but came across this video: click
Now.. I don't get that at all. So the guy with the HKS exhaust wins vs a guy with 3.91 final drive? (They both have popchargers..)
The only thing I could think of is that the guy with 3.91 also has 19" rims, but that couldn't be the reason he lost so badly..

 

Im also looking at this, can somebody (if info is correct on this post) answer this. It does'nt make sense. The 3.91 sould be walking the other z down the raod.

 

Oh, someone check the description again, I might be reading it wrong (I do that alot..)

 

Many of the time, it is the driver... not the mod; if you are comparing two 6mts

 

Yes but even inbetween shifts, just with in-gear acceleration, the other car seems to absolutely kill the guy with 3.9 final drive..

Can someone with the 3.9 final drive please comment on this?

 

well we need to know EVERYTHING about those two cars

where was that video posted? Who's cars are those?

did the dude with the 3.9 have a big pimp stereo in the back. You'll notice there was a 2nd person in that car who was videotaping. How much does he weigh? Probably 160-200 lbs maybe?

Are we certain there's no other mods?

what about weigh reduction mods? Draining windshield washer fluid, removing spare tire and tools, how full were the tanks of gas?

What year and trim are those cars? This makes a freaking HUGE difference because if you have a 06 grand touring vs an 03 base model, that's like a 200 lb difference

which HKS exhaust does the car have?

what type of tires?

both cars were manual? You can put a 3.9 in an automatic

 

regardless of the vid the fact is that a 3.9 FD equipped Z should beat a stock Z or exhaust equipped Z given equal drivers. one particular race doesn't prove crap.

 

the losing car doesn't seem like it was shifting. When racing, you'll always need to be in manual mode for optimal performance.

 

no not really, the 3.9 helps a bit, but it isn't like it's FI or something. See my above post. The other car could have a lot less weight, a better driver, better tires, etc

then there's the ECU factor. How does anyone know what timing map the ECU was running on or even what octane gas was in each car for the ECU to feel ok to get more aggressive. The other driver looked like a lot more aggressive driver which means his ECU is going to be more aggressive.

We don't even know what year and trim these cars are. Maybe the one driving was a 300hp engine with a LOT less torque and the other one was a 287hp engine with more torque to get it to jump ahead so quick

 

Very interesting...
I'm waiting anxiously awaiting on my gears to arrive... Z1 said sometime in July, so I will try to give an accurate review when I get them installed. As well as racing a few friends with modded Z's.

 

ok, but I'm wasn't talking about this specific race. I was speaking in general terms. To me it seems like dingobiatch's questions is whether an exhaust would make a Z faster than a Z with an FD (given all other things equal). and the answer is no.

 

i personally have the Central 20 3.9 final drive, to be honest with you, i dont' think it helps that much. After installing the final drive, i do feel a lil increase in all gear's acceleration, as in the pull of the gears. One thing i always thought for this final gear is that, the gear ratio for all gears should be shorter, meaning my revs should be higher for each gear at a given speed. I find my rpm rev at 3000rpm when going 120km/h, i think this is the stock rev isn't it? I was also suspecting that maybe my techo was off, but I don't really think so as I compare my speed to the cars next to me...
I did raced a couple of my buddies S2000s before, Here are my mods on my 03 performance 6mt:

Greddy E-manage, mine's straight pipe, blitz intake, custom straight mid pipe, central 20 exhaust, skunk 2 intake plenuem, buddy club suspension, work emotion cr kai rims, toyo t1-s tires. My buddy's 04' S2000 only has straight pipe exhaust, buddy club sus. On the straight, i find the first 1,2,3, gear almost the same as the S2000, and 4th i started to pull. We also did highway 3rd gear 100km/h runs, 3-4 the same, 4-5 i pull like nuts. We then switched driver, pretty much the same results. He later said he thought the Z with final drive would be a lot faster, which was what i thought.

There could also be a tuning problem with my emanage...but everything aside, the final drive...its a very weird mod that i'm still trying to figure out.

Does anyone with the 3.9 final drive have any similar experiences?

 

Ya.. my question was kinda that.. more like.. how the hell would an exhaust be better than 3.9 final drive..

 

Are you guys kidding me? That guy is a HORRIBLE driver. His response time sucks...he bogged on his launch...and he spent over a second shifting. This should not be used to compare 3.9 final drive vs exhaust.

 

have you raised your rev limiter? that can also make a world difference. I would assume you need to retune with he regearing.

 

Talking about rev limiter, if I got the technosquare reflash, would it be bad to rev up to 7500 (stock engine)? And I'm talking about quite often revving that high.. I love to do traffic to traffic light accelerations and whatnot. :-P

 

a 3.9 makes the same speed, regardless of the gear, happen at a higher rpm than it does with the stock gears.

It's a great mod to do, especially when coupled to a pulley, a flywheel, and other rev-improving mods

 

Z1, any ETA on the gears ordered in June yet?

 

eta is end of July

 

Thanks!