diablo race tuning – drt · diablo race tuning – drt . brp lynx & ski-doo 850etec setups...

Version 11 – 4.4.2020

Diablo Race Tuning – DRT

BRP Lynx & Ski-Doo 850etec setups and basic adjustments

This kit includes:

– Adjustable ramps (weights) and bolts & washers

– QRS Helix

– Primary spring

– Secondary spring

We recommend that installation of this kit should be only done by professional

workshop!

Version 11 – 4.4.2020

Adjusting the powertrain

At DRT we want to offer our clients only the best performance on the market.

No matter if you are riding deep snow, trails or hillclimb we got you covered!

From this setup & installation tip sheet you will find wide range of setups

tested by our technical team and team riders!

All the BRP 850 kits are the same, only difference is the primary clutch spring.

Spring should be chosen by preferred use, riding style and belt used.

We recommend installing a new belt when installing the kit so it will be easier

to find proper setups for the sled. There are differences in the belts and belt

manufacturers, which should be remembered when adjusting the powertrain: A

belt with more friction needs less weight and the opposite. When using old belt

it is possible that more weight needs to be used. Using too much weight can

lead to snowmobile to ”stall” in long hard run. We recommend to start with less

weight and add if needed.

Basic setup is done by adding/removing weight from center and tip of the ramp

(M6 bolts and washers). Heel can be used for fine-tuning (M5 bolts, threads

and washers).

Basic adjusting simply explained:

- If snowmobile over revs on low speed, weight needs to be added in the

center of the ramp.

- If sled over revs in higher speeds, weight should be added to the tip of

the ramp. Note that adding weight to tip has a lot more effect than

center. If you add weight to tip, might be needed to reduce weight from

the center or from the heel.

- Heel setup: Heel affects the whole rpm range. Depending the conditions,

weight can be added or removed from the heel to find correct and

preferred operating rpm and engine load.

- Too much weight on ramp will slow down the engine response.

Version 11 – 4.4.2020

SETUPS

Deep Snow

- Designed to perform on deep snow conditions

- Sharp throttle response

- Normal engine operation rpm around 8000-8100rpm, but it is not unusual to

see +8100rpm on certain riding situations

Crossover

- Does perform both deep snow and trail

- Has more load than “deep snow” setup to achieve optimal balance on all-

around use

- Engine target operating rpm 8000-8100

Trail

- Used when riding only trails

- Engine target operating rpm 7900-8100

Adjustable weight with unique heel design

-Center and tip are for M6 screws washers

-Heel is for M5 screws, threads & washers

Version 11 – 4.4.2020

Weight chart (screws / washers)

Center / Tip

6mm thread

M6 long screw 3,00g

M6 short screw 2,30g

M6 washer 0,80g

Heel

5mm thread

M5 screw 1,60g

M5 washer 0,35g

M5 thread 0,50g

- M5 threads should be locked by light thread lock glue

- Before installing the kit, see the table and check sled, riding

conditions, primary spring and what belt riders uses

Belt grip levels

BRP -571 !!

BRP -531 * !

BRP -391 !!

GBoost !!!

Gates 49C4266 !!!

Carlisle Ultimax XS821 * !!!!

*Ultimax use not recommended due to sensitivity on weather/snow

conditions

*BRP -531 use not recommended

Pro tip: on spring time on heavy snow / high altitudes like Riksgränsen

it is possible to use belt that less grip, and then there is no need to re-

adjust the clutch. For example, clutch can be calibrated to Carlisle for

the beginning and mid-season, and rider can swap to BRP/Gates on

spring season when snow & conditions gets heavier

Version 11 – 4.4.2020

SETUP CHART

Track length/size has no dramatic effect on setups, but for long tracks with 3”

lug we recommend harder spring options (230-435 or 248-450) for deep snow

riding. Ask for clients preferred riding conditions/style and belt used before

installing! Choose primary spring by these criteria and check setup chart for

correct weight amount.

DEEP SNOW

TYPE: Deep Snow SOFT

BELT: BRP -531/-571/-391

PRIMARY SPRING: soft 200-400

RPM target: 8000-8100

Heel Center Tip

1 x M5 screw No screws M6 short screw

No washers No washers No washers

Engine overrevs: add weight to heel

Engine underrevs: remove weight from the heel

TYPE: Deep Snow SOFT

BELT: GBoost / Gates 49C4266



Heel Center Tip

No screws No screws M6 short screw




Version 11 – 4.4.2020

Recommended for sleds with 3” track:

TYPE: Deep Snow HARD

BELT: BRP -531/-571/-391

PRIMARY SPRING: hard 230-435 / 248-450


Heel Center Tip









Heel Center Tip






BELT: Carlisle Ultimax XS821



Heel Center Tip

No Screws No screws M6 short screw




Version 11 – 4.4.2020

CROSSOVER

TYPE: Crossover SOFT

BELT: BRP -531/-571/-391

PRIMARY SPRING: soft 200-400 / 200-380


Heel Center Tip

1 x M5 screw M6 Long screw No screws

1 x washer 1 x washer No washers



TYPE: Crossover HARD

BELT: BRP -531/-571/-391



Heel Center Tip

2 x M5 screw M6 long screw No screws

2 x washers 1 x washer No washers



Version 11 – 4.4.2020

TYPE: Crossover SOFT




Heel Center Tip

No screws M6 long screw No screws

No washers 1 x washer No washers







Heel Center Tip

1 x M5 screw M6 long screw No screws





BELT: Carlisle Ultimax XS821

PRIMARY SPRING: hard 248-450


Heel Center Tip

No screws M6 long screw No screws




Version 11 – 4.4.2020

TRAIL

TYPE: Trail

BELT: BRP -531/-571/-391

PRIMARY SPRING: soft 200-380 / 170-385


Heel Center Tip

1 x M5 screw M6 short screw M6 short screw




TYPE: Trail

BELT: GBoost / Carlisle Ultimax XS821 / Gates 49C4266



Heel Center Tip

No screws M6 short screw M6 short screw




www.ridedrt.com

Facebook: Alta Racing Service AS

Instagram: @ridedrt & #ridedrt

For technical support contact your dealer or [email protected] (Nor)

[email protected] (Swe) [email protected] (Fin)

mailto:[email protected]



Version 11 – 4.4.2020

Installing tip sheet

Fitting the weights:

1. Fitting the pin to the weight

- Fitment might be tight when new:

- If the pin is too tight (not moving easily), you can hone the pin slightly:

Version 11 – 4.4.2020

2. Fitting weights to clutch sheave

- Metal washers will be installed on both sides of the weight

- Fitment is tight as new

- After install weights should move easily up and down

- If necessary, use sand paper to hone both sides of the weight slightly until it

moves easy

Version 11 – 4.4.2020

3. Installing M6 screws to the weight (ramp)

- Screws (and washers) should be installed on the right side of the weight

(pic below)

- M5 threads on the heel need light thread lock glue

NOTE:

- QRS BOLT THREADS SHOULD BE CLEANED AND SEALED WITH GOOD QUALITY

MEDIUM THREAD LOCK GLUE WHEN INSTALLING THE HELIX. TIGHTEN TO

SPECIFIC TORQUE. LET GLUE DRY FOR 12HRS. REPLACE BOLTS IF ANY DOUBT

THAT BOLTS ARE NOT IN 100% CONDITION.

- REMEMBER TO RE-INSTALL ORIGINAL PLASTIC BEARINGS FOR

SECONDARY SPRING TO BOTH HELIX AND QRS SHEAVE. IN OUR HELIX

BOTTOM OF THE HELIX IS FLAT, BUT ORIGINAL PLASTIC WASHER/BEARING

DOES WORK ANYWAY.

- ALLWAYS CHECK PDRIVE SPIDER ROLLER BEARINGS. ROLLERS NEED TO SPIN

EASILY, OTHERWISE CLUCTCH WONT WORK PROPERLY

Version 11 – 4.4.2020

Primary spring options

Optional primary clutch springs available with the kit

Choose your primary spring by desired engagement rpm, riding style &

conditions! See the setup chart for more info

– DALTON 170-385lbs (engagment approx. 3100-3200rpm) recommended for

trail use

– BRP 200-380lbs (engagment approx. 3300-3400rpm) recommended for trail

use

– BRP 200-400lbs (engagment approx. 3300-3400rpm)

– BRP 230-435lbs (engagment approx. 3600-3700rpm) recommended for

sleds with 3″ lug track

- DALTON 248-450lbs (engagment approx. 3800-3900rpm) recommended for

sleds with 3″ lug track

diablo race tuning – drt · diablo race tuning – drt . brp lynx & ski-doo 850etec setups...

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