Regeared RTX LE trip update from Weasel33

[Srxspec]

Yes, I've had 3 RTX LE 1.7 (blue/white) models in the shop. All three had 9 tooth 2.86 pitch drivers. With a turbo on they'll run 100 mph, then they are out of gear with the 21/49 ratio, but they are fast as hell in that 0-100 mph!

 

[fasteddie15x]

What size drivers are on a vector? My father inlaw has a 2014 vector and it is 100mph plus sled and it is stock.It walked all over my viper last year before I modded it and changed my gears. I know the gearing is 24 top 39 bottom 1.62 ratio

Yes, I've had 3 RTX LE 1.7 (blue/white) models in the shop. All three had 9 tooth 2.86 pitch drivers. With a turbo on they'll run 100 mph, then they are out of gear with the 21/49 ratio, but they are fast as hell in that 0-100 mph!

 

[weasel33]

Guys I don't know what it is. My sled has 1300 miles on it and it's a true 84 mph top speed sled. Held it several times at severL different spots on the trail and never saw 85 mph. As far as engGement it's pretty bad, I followed a groomer for around a half mile and had to just stop because the sled would not do 4 mph. Either I had to stop or do around 7 mph which would catch me right up to the groomer. Engagement is terribly jerky with cotc. There must be something wrong with the way I have mine set up because all of you say it should be smooth. My brothers sled with ulmer set up is smoother on engagement but it's not nearly as smooth as the vectors or cat 1100 turbo in our group. The standard viper is smoother than mine and my brothers but not as smooth as the other sleds in our group. The best thing I can say about the gearing is it gave me 15 mpg even if I ride it pretty hard. I think my next step is sending the clutches out to get machined.

One other thing, that bog and popping I get at take off is horrible. Both mine and my brothers sled have just stalled when coming to road crossings or coming to a stop. I think nos-pro said its in the mapping but again, for a 15000 dollar sled it's pretty embarrassing for that to happen.

 

[TD Max]

About the only thing left to try is a track swap.

Did you pull the shims from the primary?

As for the popping and missing, they all seem to do that off idle although I've never heard of any stalling issues.

With the combo of the idle pop and the high engagement you almost have to blip the throttle like a 2 stroke to start out.

 

[TD Max]

According to the Cat service manual all of their XF and ZR 7000 are supposed to have the 21/49 gearing. So is it just Yamaha that has 24/50 or are both spec sheets messed up?

 

[NOS-PRO]

Talked to Weasel33 for awhile Saturday night and everything I can possibly think of comes down to the ECU on this sled. The banging, popping and jerky engagement comes from a very lean condition between 2,600-3,250. was able to correct mine with the PC5 but know that Weasel33 does not have a PC5. There is a big difference bewteen the 14 program and the 15 program (or re-flash). My AFR meter was erfect before the re-flash and never saw anything above 13.6 at any rpm. After the re-flash, my engagement was very erratic, my AFR meter was in the 15's and popped like an OSP drag sled on the 2 step.

Changed timing? Who knows....but do know that everybody I talked to (except a couple people) are slower after the re-flash.

So, here is my quest....I am looking for a 14 ECU that has not been re-flashed to try on my sled and hopefully one of these other sleds. I believe I talked with someone and they are willing to swap.....will keep you posted.

 

[Curtis Chambers]

Weasel my engagement was terrible, jerky until clutching done not sure if I can do 4 mph though. I think our sleds are very similar in the way they act. Except I could do 93mph until I did mods now can't break 85. Clutching engages the same at 3700 ish but start out smooth. Goin out with 3 Apexs and 1 turbo viper in about an hour or so this could be interesting or sad lol. To bad we all didn't live closer we could get together with some parts and figure this out. Not that there is one answer. They all have a mind of there own. I would like to try different ECU though.

 

[Studroes144]

Guys I don't know what it is. My sled has 1300 miles on it and it's a true 84 mph top speed sled. Held it several times at severL different spots on the trail and never saw 85 mph. As far as engGement it's pretty bad, I followed a groomer for around a half mile and had to just stop because the sled would not do 4 mph. Either I had to stop or do around 7 mph which would catch me right up to the groomer. Engagement is terribly jerky with cotc. There must be something wrong with the way I have mine set up because all of you say it should be smooth. My brothers sled with ulmer set up is smoother on engagement but it's not nearly as smooth as the vectors or cat 1100 turbo in our group. The standard viper is smoother than mine and my brothers but not as smooth as the other sleds in our group. The best thing I can say about the gearing is it gave me 15 mpg even if I ride it pretty hard. I think my next step is sending the clutches out to get machined.

One other thing, that bog and popping I get at take off is horrible. Both mine and my brothers sled have just stalled when coming to road crossings or coming to a stop. I think nos-pro said its in the mapping but again, for a 15000 dollar sled it's pretty embarrassing for that to happen.

So may sound crazy but have u tried all stock clutching back in the sled? Springs, weights, helix etc. if your rpm is spot on with different setups and still no top speed you know for sure you can eliminate clutching. With mine I can literally putt around a parking lot at 1 mph and not have it go over that if I want to. Mine still has that little lean spot around 2800, but that doesn't affect how smoothly the sled rolls once the clutch is engaged..and the weights I have are the same aggressive profile of the stock weights.

 

[Curtis Chambers]

Studroes is that directed at weasel33

 

[Studroes144]

Strudroes is that directed at weasel33

Yes, I mean at this point (if it hasn't been tried yet) anything is worth a shot. The cotc setup and the stock setup are about as opposite as you can get, so if that doesn't change anything you can narrow out that possibility

 

[TD Max]

Weasel had stock clutching on his versus Ulmers on his brothers for their first trip.


Terry, Did I hear you guys are testing in Weston this weekend?

Just for grins I added 5 shims to my Ulmer setup. I got a jerky engagement and 84 mph in decent conditions. I did not really pick up the upper RPM that I thought I would. Using my watch the tach method my sled runs in the 8400-8600 like it typically does with a brief 8700.

 

[Studroes144]

Weasel stated "engagement was terrible jerky with cotc" I'm assuming he used that setup and was getting all the low speeds still.

 

[TD Max]

Weasel stated "engagement was terrible jerky with cotc" I'm assuming he used that setup and was getting all the low speeds still.

My recollection of the call: COTC with 3.6g in tip. He had jerky engagement, bumping rev limiter, no gain in top speed, pretty much dead even with brother's sled. Brother's sled is running Ulmer clutching and 50# more rider weight.

What does not add up is that the dealer sled is said to have gained a bunch of mph with the gearing change and they did not.

 

[NOS-PRO]

Terry, Did I hear you guys are testing in Weston this weekend?

Yes.

My recollection of the call: COTC with 3.6g in tip. He had jerky engagement, bumping rev limiter, no gain in top speed, pretty much dead even with brother's sled. Brother's sled is running Ulmer clutching and 50# more rider weight.

What does not add up is that the dealer sled is said to have gained a bunch of mph with the gearing change and they did not.

And this was the main part of our discussion the other night between myslef and Weasel....why did the dealer gain mph and they didn't?

Weasel stated "engagement was terrible jerky with cotc" I'm assuming he used that setup and was getting all the low speeds still.

Remember...it's not the clutch kit doing this, it is the ECU lean spot that is causing this. I'm able to crawl at any mph. This was after I richened up the PC5 to compensate for the lean condition.

 

[Studroes144]

I have the same lean spot on mine, mine slowly creeps at 2600-2700-2750 then it jumps to 3100-3200 and engages somewhere in the middle, but engagement is smooth and doesn't jerk a bit. I'm more curious if it's the actual clutches themselves rather than just setup, but I'd hafta thing that all that stuff has already been checked over