New Final Drive Ratio

[hombre]

The table below shows theoretical MPH speed vs RPM for each gear, calculated with a new final drive ratio of 2.33 (2 teeth each on ring and crown gear). It also assumes 7250 RPM limit and 18" BST wheels, but tire diameter is similar to stock.

....... 1...... 2... 3... 4... 5
0 ---- 0.0 - 0.0 0.0 0.0 0.0
0500- 5.4 - 8.1 11.0 13.6 16.3
1000 10.8 16.2 21.9 27.1 32.7
1500 16.1 24.3 32.9 40.7 49.0
2000 21.5 32.3 43.9 54.3 65.3
2500 26.9 40.4 54.9 67.9 81.7
3000 32.3 48.5 65.8 81.4 98.0
3500 37.6 56.6 76.8 95.0 114.3
4000 43.0 64.7 87.8 108.6 130.7
4500 48.4 72.8 98.8 122.2 147.0
5000 53.8 80.9 109.7 135.7 163.3
5500 59.1 89.0 120.7 149.3 179.7
6000 64.5 97.0 131.7 162.9 196.0
6500 69.9 105.1 142.6 176.5 212.3
7000 75.3 113.2 153.6 190.0 228.7
7250 78.0 117.3 159.1 196.8 236.8

I've found a company capable of cutting these gears, but due to dial-in and break-in considerations, I have no interest in manufacturing them for sale. However, it's just as easy for them to cut a few extra sets when they setup tooling for two (I always buy a spare). No pricing yet, but if you have an interest, PM me.

 

[hombre]

It's been pointed out to me that 2.33 is a bit low for all around street use. Here's the same chart for 2.57 gears (1 tooth each):

..... 1 ... 2 ... 3... 4 ... 5
0 - 0.0 - 0.0 - 0.0 0.0 0.0
0500 4.9 7.3 9.9 12.3 14.8
1000 9.7 14.7 19.9 24.6 29.6
1500 14.6 22.0 29.8 36.9 44.4
2000 19.5 29.3 39.8 49.2 59.2
2500 24.4 36.7 49.7 61.5 74.0
3000 29.2 44.0 59.7 73.8 88.9
3500 34.1 51.3 69.6 86.1 103.7
4000 39.0 58.7 79.6 98.5 118.5
4500 43.9 66.0 89.5 110.8 133.3
5000 48.7 73.3 99.5 123.1 148.1
5500 53.6 80.7 109.4 135.4 162.9
6000 58.5 88.0 119.4 147.7 177.7
6500 63.4 95.3 129.3 160.0 192.5
7000 68.2 102.6 139.3 172.3 207.3
7250 70.7 106.3 144.2 178.4 214.7

 

[Sidecar Flip]

The table below shows theoretical MPH speed vs RPM for each gear, calculated with a new final drive ratio of 2.33 (2 teeth each on ring and crown gear). It also assumes 7250 RPM limit and 18" BST wheels, but tire diameter is similar to stock.

I've found a company capable of cutting these gears, but due to dial-in and break-in considerations, I have no interest in manufacturing them for sale. However, it's just as easy for them to cut a few extra sets when they setup tooling for two (I always buy a spare). No pricing yet, but if you have an interest, PM me.

Hombre....

First off, you don't have either the capability or the knowledge to manufacture a matched gear set. What you did was find a shop willing to hob a gearset for you, in other words a gear hobber (which is the proper machinist term) for gear manufacturing. I also believe you'll find that one off gearsets are quite expensive for the final drive in the R3 and just replacing the gearset (ring and pinion) is a bit more involved that you expect. Just like any hypoid gearset, the coast and drag has to be set with proper shims and the proper pinion preload as well. While I enjoy reading your posts and I enjoy looking at your machinery, you are venturing into areas that I have a pretty through knowledge of. Don't step over the line with a statement like 'I have no interest in manufacturing them for sale'......you don't and you lack the knowledge. You aren't a manufacturer but rather an end user.

 

[hombre]

I stand corrected, Flip. When I learned about the difficulty in dialing the gear set, AND the critical break-in, I knew it wasn't something I wanted to be responsible for... ie. the marketeer. I also knew the break-in was beyond the capabilities of the average R3 rider.

Neither of these difficulties will prevent my having a gear set machined, installed, and properly broken-in for my use.

 

[THE PUNISHER]

I stand corrected, Flip. When I learned about the difficulty in dialing the gear set, AND the critical break-in, I knew it wasn't something I wanted to be responsible for... ie. the marketeer. I also knew the break-in was beyond the capabilities of the average R3 rider.

Neither of these difficulties will prevent my having a gear set machined, installed, and properly broken-in for my use.

I wish one day I had your amount of play money

 

[busajack]

Chain

Easer and cheaper to convert to chain and eleminate the final drive and bearing problems and gain 15-20 HP..And have no end to ratios..BJC

 

[Baggage1]

Chain?

Busajack I was impressed while I was in California just starting out in my field on info about the engine on the shuttle and what the mechanical components had to rev to in in a split second from some guys at a component jobber. I rode my Trophy for 10 yrs and several chains and motor rebuilds. I know your busa is chain and the technology has improved from those days but if that puppy let loose at 250mph I sure wouldn't want to be around for that. I've cut straight ratio sets, nothing fancy but helical is another world and I don't have that much time or inclination to get into it. Hombre sounds like he knows what he wants and has demonstrated a proficiency at getting it done. But for someone to want to check out the monster at those speeds better be strapped in so he don't get sucked off that thing. I'll be a prayin for ya Hombre.

 

[busajack]

Busajack I was impressed while I was in California just starting out in my field on info about the engine on the shuttle and what the mechanical components had to rev to in in a split second from some guys at a component jobber. I rode my Trophy for 10 yrs and several chains and motor rebuilds. I know your busa is chain and the technology has improved from those days but if that puppy let loose at 250mph I sure wouldn't want to be around for that. I've cut straight ratio sets, nothing fancy but helical is another world and I don't have that much time or inclination to get into it. Hombre sounds like he knows what he wants and has demonstrated a proficiency at getting it done. But for someone to want to check out the monster at those speeds better be strapped in so he don't get sucked off that thing. I'll be a prayin for ya Hombre.

Hey, I know that chain use to scare the hell outta me every time I looked at it,but ya know just about all the top speed records are being set with chains and very few problems or breakage.If it breaks at 100 your just as dead as 250.The chain is still the most efficient way to transmit power that we have but I hate the filthy messey maintance hassels..Jack

 

[Gunshots]

One could slide just as far if a universal was to take a **** on ya too.

 

[talltxguy]

Hombre, do you plan on going the chain route eventually? I would have thought your RWHP / RWTQ would demand a chain drive by now. Is there a RWHP # when you would say to yourself, 'Yeah, I gotta get a chain'?