well i understand the 4.45 would be the best for acceleration, but is it also the stronger of the 3? i'd really like to try and stay out of 4th if at all possible. i may end up running a 28" tire as well. based on how bad it breaks loose in 2nd on the 110 idk if a 26" will hold it

 

It's not so much about the 4.45 gearing being "stronger" as it is more about there being significantly less strain on the drivetrain componants due to a 4.45 gear being much deeper of a gearing than a 3.82.

It basically creates significantly less rolling resistance which in return greatly decreases the chances of the weak links in the drivetrain peaking their ugly head, such as the well known issue with 3rd gear in the F35, ESPECIALLY if you plan of running a taller and stickier tire...

 

roger. looks like i'm goin with 4.45s

 

yes, it's not about going faster. The increased mechanical advantage increases the power handling capacity of the trans. A gear will handle more power the faster it is turning.

 

well. i'm glad you guys cleared that up for me. cause i just tried fitting my spacers i had made to be wheel centric to centerlines into my 16"s that i have my 555r's mounted to. and they fit perfectly. and the only true slick i've found so far is a 28". with the coilovers, it'll fit, but i mean...its a 28" lol.

 

Took that out of a truck bed that was traded in lol.

 

lol hey gotta do what you gotta do

 

You need to stay 26 or smaller I would think. Putting on a 28 in tire would negate the 4.45 gear I would think. I will be staying on a 24x8.5

 

i'm not worried about the gearing for acceleration. i want something strong. and being a bigger turbo car, i don't make much power down low so the longer i can stay in the gear up top, the more i can accelerate. that and Ryan was telling me he spun pretty bad on the 24.5s. the 26s idk how i'd do but its about a 3 week wait time for the wheels. if i stayed with the 16" wheels, i could have my slicks before i even pick up the car.

 

i start seeing boost around 3400, 10psi at 4600, 23psi at 5100, 31.5psi at 5500. so the longer i'm in gear, the longer i can keep making power. the acceleration i'd see with the 4.45 and 28s is pretty much exactly the same as a 24.5 on a 4.05


24.5 and 4.05, shift into 4th
24.5 and 4.45, shift into 4th
26 and 4.05, might shift into 4th
26 and 4.45, shift into 4th
28 and 4.05, can stay in 3rd
28 and 4.45, might shift into 4th

 

Mine feels real strong. Acceleration is unreal in all gears. ZZP 4.45 stage 2

 

If you are going to have to go into 4th it is better to get there sooner than later. I know with the 4.45 and 24.5's I will be hitting 4th shortly after the 1/8th mile and carrying it out to the 1320. On a bigger tire you may have to shift still but it might not be till the 1000 foot mark or more and the car may not recover enough before going throw the traps. I see what your saying, but with a proper set up as far as suspension and everything you can do better with the smaller tires.

 

Thats good to hear. Looks like I may go this way as well. I was in on the shep trans but there is not going to be enough people quick enough, also I will need to replace the clutch again as well so thats 700 extra bucks.

 

What do you expect to trap? Maybe 125ish? If so....

A 4.05 gear with a 26" tire should put you at around 6400rpm in 4th by 125mph
A 4.45 gear with a 26" tire should put you at around 7000rpm in 4th by 125mph
A 4.45 gear with a 28" tire should put you at around 6550rpm in 4th by 125mph

Personally I like the combo of the 4.45 gearing with a 26" tire. It just puts you at a perfect rpm through the traps assuming you trap 125mph of course. Although the 28" isn't REALLY all that far off from the 26" rpm wise at 125mph

 

yeah i'll definitely be trying many different setups. but since my spacers will fit the 16s i already have, i'm gonna try out the 28s first, cause if they work then i won't need to spend $600 on wheels.

heres the mph that 3rd ends with each of these combos

24.5 and 4.05, 122
24.5 and 4.45, 111
26 and 4.05, 129
26 and 4.45, 117
28 and 4.05, 139
28 and 4.45, 126

so 26 on a 4.05, and either of the 28s i'll be good. but the others idk where i'll be at when i shift into 3. i know for a fact a 24.5 won't hook up so i'd have to go with a 26 and 4.45 then, which i'm guessing is gonna be right inbetween the 1/8 and 1000' mark

 

this is also assuming i'm on the race gas tune and not the pump gas as theres about a 180-190whp difference between the two

 

Yea at least get the trans part done and then you can mess with the tire wheel combos since its the cheaper part.

 

Is the math accurate here? I'm figuring these trap speeds in 4th not 3rd

 

definitly third. 4th on a stock tire and the 4.45's is about 142

 

?? I'm not saying you're wrong buy I just can't see how that's possible unless you're spinning over 8000rpm. Which is of course very possible with the build you guys have

 

yes the limiter is at 8,100 but i'll shift at or a little before 8

 

ahh that changes alot then. Ok my mistake there. I stupidly assumed your limiter was set at 7500.

My math is still a little off from what you're coming up with, but it definitely makes more sense now.

I'm coming up with 115mph @ 7971rpm, 4.45 28" tire
110mph @ 8211rpm, 4.45 26" tire

So I'm still thinkin you will need to shift to 4th judging from my math, but I could definitely be wrong

 

But it also cancels out the increased mechanical advantage. Why are you trying to avoid using 4th gear?

 

You need to watch some erabbit23 videos.

 

I'm working on that!!! Don't give up on me yet. I'm trying to please everybody as well as make our trans as bulletproof as it can be for a reasonable price. You, or whoever was saying about 4th gear being unnecessary to be redesigned, is right. We can def save money there and do more work to tighten clearances instead.

Fall/Winter is coming fast and if we can have this done and available by the spring I think it would take off.