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Ski-Doo: TURBO Turbo discussion for Ski-Doo aftermarket turbo sleds
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  #1  
Old 01-29-2018, 07:22 PM
panorama panorama is offline
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Default "Rate of RPM limiter" keeps getting triggered - clutching issue?

Turboed XM @ 6-7PSI

I am wondering how I can build more "load" into the clutch system as the XM keeps triggering the what i assume is the "rate of RPM limiter" - if i punch the throttle (usually happens around 6000 - 7000 rpm - cuts right out).

The is no over rev displayed - as It is not over reving because if i slowly increase the throttle to full it lands around 7400RPM - no where close to 8300. If I put it on clicker one to decrease RPM I can then punch the throttle again but i cant get full rpm as it lands about 7000 RPM - but the rate of RPM limiter does not get triggered. If i try to increase the clicker - to get proper RPM (7900) I can't punch the throttle at all - it just triggers the rate of RPM limiter. I have to stay under 7400. If i try to increase RPM or increase boost from 6 to 7 - it immediately trigger rate of RPM limiter when i punch the throttle.


I tried stock secondary - way way worse!



Someone told me that a 43/47 Helix works well on the XM turbo to add more load to slow down the rev rate so the limiter is not triggered. I am not sure what the angle of the Cudney CR-8 is that i have in it.




Current specs:

2013 XM 800

mountain riding mostly @ 5000-6500 feet

21-51 gearing - 163 2.5 track
200/290 primary spring
441 ramps
23 grams pin weight
CR-8 Helix (cudney racing)
165-300 Secondary Spring (Dalton red)
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  #2  
Old 01-30-2018, 06:49 AM
Turbo11T Turbo11T is offline
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Im not sure what the CR-8 helix is exactly. But I will give you some thoughts.


You need to set your clickers on 3 and then adjust your pin weight to make 7900-8000 rpm. Clicker 3 is the best all around spot for revviness and load. Clickers are to fine tune your sled once you have it right where you want it. Preferably just overreving(8100) on the trail so that it will be right at 7900 in the powder.


I kind of doubt you are setting a safety for rpm increase. I have a lightweight primary and 1mm oversize rollers and my sled revs extremely fast with no issues. Others have ran the p85 which is light and revs quickly as well. Wells others still have ran the new pdrive which revs quickly as well and still not experienced what you think is happening.


I think you need to fix your WOT RPM first.


I will share what I am running for clutching and have been super happy with.


DJ mountain ramps 415/441 blend
200-290 spring
21.5 grams of pin weight
1mm oversize rollers(adds 2 grams, Makes it revvyer)
DJ qr11 Helix(no idea on the angle as he doesn't tell you)
225/330 spring


My buddy is running close to the same setup but he doesn't have the DJ helix he is running a 43/47 helix. His works ok but not as good as mine.


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  #3  
Old 01-30-2018, 07:57 AM
fredw fredw is offline
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Explain what's your thoughts on what the clickers do on this pdrive, do they drop or increase top rpm or just make bottom revier?? ... When you increase clicker does it pull on motor harder pulling it down in rpm?? Thanks

Quote:
Originally Posted by Turbo11T View Post
Im not sure what the CR-8 helix is exactly. But I will give you some thoughts.


You need to set your clickers on 3 and then adjust your pin weight to make 7900-8000 rpm. Clicker 3 is the best all around spot for revviness and load. Clickers are to fine tune your sled once you have it right where you want it. Preferably just overreving(8100) on the trail so that it will be right at 7900 in the powder.


I kind of doubt you are setting a safety for rpm increase. I have a lightweight primary and 1mm oversize rollers and my sled revs extremely fast with no issues. Others have ran the p85 which is light and revs quickly as well. Wells others still have ran the new pdrive which revs quickly as well and still not experienced what you think is happening.


I think you need to fix your WOT RPM first.


I will share what I am running for clutching and have been super happy with.


DJ mountain ramps 415/441 blend
200-290 spring
21.5 grams of pin weight
1mm oversize rollers(adds 2 grams, Makes it revvyer)
DJ qr11 Helix(no idea on the angle as he doesn't tell you)
225/330 spring


My buddy is running close to the same setup but he doesn't have the DJ helix he is running a 43/47 helix. His works ok but not as good as mine.
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Old 01-30-2018, 09:08 AM
Turbo11T Turbo11T is offline
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Quote:
Originally Posted by fredw View Post
Explain what's your thoughts on what the clickers do on this pdrive, do they drop or increase top rpm or just make bottom revier?? ... When you increase clicker does it pull on motor harder pulling it down in rpm?? Thanks


Fred,


No idear on the pdrive clickers. His post is on a XM so it has the TRA. I was making note of the fact that the pdrive is lighter so in turn it is faster revving and that many have ran it on the 800 etec without causing a "rate of RPM increase" safety in the ECU.


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Old 01-30-2018, 11:09 AM
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That is the strange thing - if i try to raise my rpms to get them around 8000 it just cuts out when i pin it (around 6000). Gauge never says over rev. The only way i can get it to not cut out is when i set the clickers to keep the rpm below 7400 (then i can pin it). Or if i lower the boost i can get more rpm but then i am only at 5psi boost. That is why i was thinking it was the rate of RPM limiter.

Maybe there is some other issue going on?
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Old 01-30-2018, 12:05 PM
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Quote:
Originally Posted by panorama View Post
That is the strange thing - if i try to raise my rpms to get them around 8000 it just cuts out when i pin it (around 6000). Gauge never says over rev. The only way i can get it to not cut out is when i set the clickers to keep the rpm below 7400 (then i can pin it). Or if i lower the boost i can get more rpm but then i am only at 5psi boost. That is why i was thinking it was the rate of RPM limiter.

Maybe there is some other issue going on?


You must have missed my point about setting the clickers on 3 and changing your pin weight until you get 8000 rpm. 3 is where you want to run the clickers. No matter turbo'ed or not.


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Old 01-30-2018, 01:08 PM
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That is classic "rate of rpm" hesitation. It's from not loading hard enough in the low-mid.
The 200 primary spring start is where I would start....never could get a etec to consistently not trigger that annoying hesitation, even stock. I would drop to a 160 start, adjust weight as needed and run on clicker 3-4.
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Old 01-30-2018, 03:55 PM
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Thanks Winter Brew!! I Will try a 160-290 primary spring - and adjust weight to clicker 3 or 4.
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Old 01-31-2018, 09:15 PM
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I`m with winterbrew totally rate of rpm hesitation. I run almost the same setup had to get all the way up to 25 grams pin weight with 2mm over sized rollers that pin weight includes the extra weight of the oversize rollers. this is on a impulse setup 7 psi. sled rips can pin it from a dead stop now no hesitation had to run a 320 finish cause my top end rpm was dropping off on a long pull with a 290 finish rate. 5000 too 7000+ feet elevation.

DJ mountain ramps 415/441 blend
160-320 spring
25 grams of pin weight
2mm oversize rollers
DJ qr11 Helix
225/330 spring
clicker 3
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Old 02-05-2018, 06:50 PM
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Old 02-06-2018, 09:51 AM
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Old 02-06-2018, 11:02 AM
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Old 02-06-2018, 02:49 PM
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Old 02-06-2018, 03:01 PM
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Old 02-06-2018, 05:19 PM
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Old 02-10-2018, 10:15 PM
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