07 RTX Gearing?

[dfroster]

Anyone know if the 07 RTX gearing be geared down like the Nytro?

 

[stumper]

That's what I 've heard, but someone on here probably has firm numbers. I've got a Nytro, and it pulls big time!! If the lower gearing is a reality, then that should be one potent combination of HP and gearing!

 

[Iceman57]

All 06 Apex including the RTX use a 24 top gear. All Attacks use a 23.

For 2007 all of that remains the same except for the RTX which will have a 22 top gear.

I hope this helps

I believe all use a 38 lower gear. I have a Apex ER and changed the lower to a 40 and when I checked the stock, it was 38.

 

[Mighty]

Anyone know if the 07 RTX gearing be geared down like the Nytro?

Yes, for better corner to corner acceleration.

 

[Srxspec]

22-38 gearing

 

[Candyredrx1]

Your gonna lose top end though.

 

[LazyBastard]

It'll only loose top end if it overrevs at full shift, otherwise it will NOT. 22/38 on an 03-05 doesn't overrev, 06+ engine gearing is little lower, so it *might*, but this can be cured with a little overdrive. Most people who loose top end when they gear down forget to add weight to the primary to force it to shift more.

 

[LJ 452]

Alright I've got a few questions? In earlier posts guys are talking about going to a 40 tooth bottom gear and not sure about the top. My question is, what is the gear arrangement for this 40 tooth setup. I'd like to improve corner to corner, as I don't use the full top end anyway. Also it seems like my belt never reaches full shift. There's about 1/2" to 3/4" of secondary that is untouched. Will this 40 tooth setup help or hinder. Sorry if these are dumb questions but I'm fairly new to the performance side of sledding.

Thanks,

 

[LazyBastard]

Two teeth bigger on the bottom is approximately equal to 1 tooth smaller on the top. Most going to 40 bottom are going to 24/40, some are going 23/38, which is about the same ratio. I went to 23/42 with overdrive, for about 15% lower engagement ratio and 10% lower full shift ratio, top end is not noticeably affected, holeshot is just silly - be careful with passengers, need to hold on TIGHT.

So to answer your question... don't stop at 40. When my new gears arrived, I found that the chain wasn't quite long enough to reach around the 42 tooth bottom, so I tried it out with 23/38. The difference wasn't enough to mention. The next weekend, I had a new longer chain (72L), and had the ratio fully lowered. NICE change. With that, it was overreving a little, so I slammed as much weight as I had at my HH's. Now its perfect.

Now as for your not fully shifting, that is due to two things;
1) Factory clutches can't shift out fully regardless of gearing/power/resistance. To correct this, you need to cut the surfaces of the primary where they touch together to allow them to close further, and space the helix out further in the secondary. This is overdrive.
2) Your sled is overgeared, that means that the engine isn't strong enough to go fast enough to have the clutches shift out fully (or even as fully as possible with unmodified clutches). This can be corrected by lowering the gear ratio.


What you are really looking for is this; you want the clutches to shift out fully, and you do NOT want the engine to overrev when you run at top speed.

 

[LJ 452]

Thanks for the info. Greatly appreaciated.

 

[snowbeast]

Yup if the 07 rtx is geared 22/38 it will be quicker to 80 mph than buy buy to the 07,the 06 will blow by it,22 top is to much of a drop to make up,any way you want to cut it,overdrive it clutch it do whatever you want,mine will be faster thru top end of midrange and top end,oh ya mine will get better milage too.

 

[Mighty]

Yup if the 07 rtx is geared 22/38 it will be quicker to 80 mph than buy buy to the 07,the 06 will blow by it,22 top is to much of a drop to make up,any way you want to cut it,overdrive it clutch it do whatever you want,mine will be faster thru top end of midrange and top end,oh ya mine will get better milage too.

I was told by a Yamaha rep that top end will suffer but they figured buyers of this sled weren't too much concerned about it.

 

[SledFreak]

Viper34, said it was 2-3 mph slower than the GT on the gun, but I believe that is at best conditions.

 

[Mighty]

SledFreak, do the chicks in Ontario really look like the ones in your avatar? If so I may have to make a visit

 

[SledFreak]

SledFreak, do the chicks in Ontario really look like the ones in your avatar? If so I may have to make a visit

Oh Ya, most definitely.