Gearing test, 22t vs 24t

[ranger1]

Upon searching old posts, I have noticed that most agree that the 23t top gear & 38t bottom seems to be the best combination for the Apex. The problem I am having is that I want to go up to the 23t as recommended, but everybody says unless you are getting full shift out of the clutches (rarely happens unless on snow plowed road) you are wasting money gearing up because you will gain nothing on top end. If this is true it would be a big waste of money as going up from a 22t to 23t I would have to buy a 70L chain as well as the gear.
This brings me to the gearing test.
A friend of mine & myself marked our clutches & compared the sleds at wide open for about a mile down a loosely packed track. His sled was faster than mine & the shift out was exactly the same ( 1/2" from top of primary). Since the conditions were not optimum, we knew we would not get full shift out. The consensus say that the apex can't pull the 24t so this is why the 23 is recommended.
So why & how could his 2008 apex with 24t gear be faster when in those conditions the 22t should shift out more than his & be technically faster?
If I know for sure that taller gearing can be faster even if the conditions don't allow full shift out, then I will invest in a 23t or 24t with the longer chain.

 

[machzrobbie]

24 is the fastest gear with our testing, and your buddies sled proved it

 

[SledFreak]

Upon searching old posts, I have noticed that most agree that the 23t top gear & 38t bottom seems to be the best combination for the Apex. The problem I am having is that I want to go up to the 23t as recommended, but everybody says unless you are getting full shift out of the clutches (rarely happens unless on snow plowed road) you are wasting money gearing up because you will gain nothing on top end. If this is true it would be a big waste of money as going up from a 22t to 23t I would have to buy a 70L chain as well as the gear.
This brings me to the gearing test.
A friend of mine & myself marked our clutches & compared the sleds at wide open for about a mile down a loosely packed track. His sled was faster than mine & the shift out was exactly the same ( 1/2" from top of primary). Since the conditions were not optimum, we knew we would not get full shift out. The consensus say that the apex can't pull the 24t so this is why the 23 is recommended.
So why & how could his 2008 apex with 24t gear be faster when in those conditions the 22t should shift out more than his & be technically faster?
If I know for sure that taller gearing can be faster even if the conditions don't allow full shift out, then I will invest in a 23t or 24t with the longer chain.

The 22 gear works better on the pro-active skid or a 136 mono skid.... The 23 gear works better on the mono for a 121 and 136 and will provide better acceraltion in a 1/4 miles or less. For all out top end in very good hard packed condition the 24 gear will pull better top end...

 

[07apexcan]

What is the stock gearing of a 2007 apex short track ?

 

[yamstock1]

What is the stock gearing of a 2007 apex short track ?

24/38

 

[SledFreak]

What is the stock gearing of a 2007 apex short track ?

Apex RTX is 22/38. Standard Apex is 24/38.

 

[BADSLED]

What is the stock gearing of a 2007 apex short track ?

24/38

2007 Apex RTX has 22/38 gearing.

 

[ranger1]

24 is the fastest gear with our testing, and your buddies sled proved it

Did you guys ever test the 24 in a Attak? Those sleds ran a 23 on top & were faster than the Apex's that were running 22's & 24's. Just can't figure out why the long track is faster when normally long track sleds are slower do to more rotating mass, hmmm???

I noticed that you run a supercharger, have you ever tried a 25t? I seen somewhere that a clutch kit manufacture runs 25's in their kits but I would imagine it would have to be in modded sleds that are pumping out more hp. I don't think it would work in stock sleds unless on ice road.

 

[darv]

I have a 136 23/38 gearing

 

[sledneck22]

http://www.totallyamaha.com/snowmobiles ... /Specs.htm

That link is in the tech section for future use... You can differentiate between all the different makes and models

 

[machzrobbie]

24 is the fastest gear with our testing, and your buddies sled proved it

Did you guys ever test the 24 in a Attak? Those sleds ran a 23 on top & were faster than the Apex's that were running 22's & 24's. Just can't figure out why the long track is faster when normally long track sleds are slower do to more rotating mass, hmmm???

I noticed that you run a supercharger, have you ever tried a 25t? I seen somewhere that a clutch kit manufacture runs 25's in their kits but I would imagine it would have to be in modded sleds that are pumping out more hp. I don't think it would work in stock sleds unless on ice road.

I run a 25 in my S/C sled but I am running 12# of boost, we tested it in the stocker and unless you were on glare ice it was slower everywhere, and it only matched the 24 on glare ice - it was no faster. I personally use the 24 gear in my stocker as it out performed the 23 everywhere on our set up. My buddy stone has a attack and we have the same clutching gearing and PC3 set up - sleds are set up identicle and he is always 1-2 MPH faster on top end - the 136 MONO skid is faster.

 

[ranger1]

http://www.totallyamaha.com/snowmobiles/AAATuning%20Chart/Specs.htm

That link is in the tech section for future use... You can differentiate between all the different makes and models

Thanks a lot sleneck22 for the link to the tuning chart. It is nice to be able to compare specs with the other yammi models!!

 

[ranger1]

24 is the fastest gear with our testing, and your buddies sled proved it

Did you guys ever test the 24 in a Attak? Those sleds ran a 23 on top & were faster than the Apex's that were running 22's & 24's. Just can't figure out why the long track is faster when normally long track sleds are slower do to more rotating mass, hmmm???

I noticed that you run a supercharger, have you ever tried a 25t? I seen somewhere that a clutch kit manufacture runs 25's in their kits but I would imagine it would have to be in modded sleds that are pumping out more hp. I don't think it would work in stock sleds unless on ice road.

I run a 25 in my S/C sled but I am running 12# of boost, we tested it in the stocker and unless you were on glare ice it was slower everywhere, and it only matched the 24 on glare ice - it was no faster. I personally use the 24 gear in my stocker as it out performed the 23 everywhere on our set up. My buddy stone has a attack and we have the same clutching gearing and PC3 set up - sleds are set up identicle and he is always 1-2 MPH faster on top end - the 136 MONO skid is faster.

When you test your sleds is it always perfect conditions, or sometimes snowpacked as well? Do you think the 24 would work in my pro-active skid even though a lot of RTXER"S seem to think they are geared lower due to the fact they can't pull a higher gear. I think they are geared lower because it was built to be a ditch banger with more corner to corner pep ( just my opinion though)
I believe you are right in that the 136 mono is a faster skid, not sure why, maybe it has a less attack angle in the front curve of the skid possibly? I was debating changing out the the skid on mine but don't know where to even start. I have no idea which skid has a good ride, is fast & will fit under the Apex.

 

[Essarex]

The reason the 24 tooth was faster on top even without full shift out (compared to the 23 or 22), is because the taller gearing requires less shift out for the same final drive ratio. With less shift out, the clutches are closer to the 1:1 ratio, which is the most efficient ratio for transmitting power thru a belt CVT.

For trail riding, you want the tallest gearing you can run while still pulling strongly out of the hole. Once out of the hole, the CVT will automatically settle on the right final drive ratio to keep the sled on its hp peak. The track doesn't know what gear you have in the chaincase - it only "sees" the final combination of gearing, drivers, and clutch ratio. If, on the other hand, you are on the ice with a speed track and 240 needle sharp steel picks, you can afford to gear down because you will have the traction to take advantage of the low primary drive.

Also, when mountain riding, where speeds are considerably lower than trail riding, you want to gear down so that your new lower top speed is achieved at that 1:1 ratio.

 

[Super Sled]

I have a 136 23/38 gearing

Not to be off topic, but 23/38 is the standard 07 Attak gearing, right? My brain is not remembering right now!