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VFJ clutch weights and primary spring testing

18K views 91 replies 22 participants last post by  Jimbo630 
#1 ·
Finally got around to uploading my videos with the clutch weight testing.

My Teryx is completely stock (performance wise) and rolls on 27" Roctanes with 14" STI beadlocks wheels. I drove the Rex down the road and back before each pass to warm the engine and fluids. The videos are back to back with the only difference being the clutch weights and primary spring. My daughter, who weighs 100 lbs did the video as I drove. We did a pass each direction.

My results were a one second drop in my zero to 50 mph time, with most of the gain between 20 and 40 mph. The speedo jumps too quickly to do anything under 20 mph.

Before
2013 Teryx 4 before clutch modification:

2013 Teryx 4 acceleration with VFJ clutch weights:
 
#3 ·
I got the same setup you did AZ and I added the PCV at the same time. I am topping out at 54 mph with no engine mods, full windshield, and 28" Evo's. I noticed the same low and mid range pickup that Ludicrous did as well as running out of motor between 45 and 54 mph. I am wanting to hit a trail tomorrow and see what it done for the low end torque. At this point I am very satisfied with the set up.
 
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#4 ·
Ludicrous, I would like to have seen what your Muzzy slip on would have done if you had kept it on. Was the sound that much louder? I know that is why you took it off.
 
#5 ·
I had John see it up mostly for trail riding. Most of the trails we run are at 15mph or less.

I thought about doing the same testing with the Muzzy, but I did not have enough time, and when I realized it was louder than I wanted, I didn't want to drive it and take a chance on something damaging it in any way.
 
#9 ·
Finally got around to uploading my videos with the clutch weight testing.

My Teryx is completely stock (performance wise) and rolls on 27" Roctanes with 14" STI beadlocks wheels. I drove the Rex down the road and back before each pass to warm the engine and fluids. The videos are back to back with the only difference being the clutch weights and primary spring. My daughter, who weighs 100 lbs did the video as I drove. We did a pass each direction.

My results were a one second drop in my zero to 50 mph time, with most of the gain between 20 and 40 mph. The speedo jumps too quickly to do anything under 20 mph.

Before
2013 Teryx 4 before clutch modification: http://youtu.be/co44Qw2a0vI

2013 Teryx 4 acceleration with VFJ clutch weights: http://youtu.be/OmMd5FhZ2q0
Great videos Ludicrous! I really appreciate it because I did the VForce kit with weights and primary spring to offset some performance loss with Roctane 28x10's all the way around. I did it about a week and a half ago and immediately winter decided to show up. I haven't been able to test.

I tried to hand time your videos as best as I could and I kept getting around 4 second 0-30 times. some barely over and some under with human inconsistency.

If I get similar results I will be thrilled, considering I have bigger tires and I am at high altitude

Thanks for the videos.
 
#11 ·
I just played the video and would stop it and look at the timer on the video. I could advance frame by frame that way.

Kawi4life, I still have it and it is for sale. Make me an offer. Other than 15 minutes time, it is brand new in the factory box and everything it comes with, including the stickers. It will cost me $30 to ship
 
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#14 ·
Jschmidt, I do not recall the exact numbers now. I had them all written down and my wife pitched the paper, lol
 
#16 ·
Hi guys
I am new to the site and I am looking for some advice.
I have a 2014 teryx4, completely stock unit with a 2" lift kit installed.
I only ride trails with lots of mud.
I am putting on mud tires this spring, 28 or 29's.
What would you suggest for upgrades to get better lower end torque for the mud?
 
#17 ·
Vfj clutch kit and programmer, the weights and spring make a big difference. Programmer moves the rev limiter to 9600rpms and removes the gov. If you have the cash the muzzy exhaust is a big improvement from what others are saying


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#19 ·
I've only done the weights at the moment plus the fuel utv airfilter. I'm still running the stock tires and I hit the rev limiter after 40, VFJ did say you might be bouncing off the limiter do to them being set pretty low around 7500 I think. The airfilter is around $60 but if you do over it go ahead and get the prefilter as well. there around 20 and well worth it my opinion. I order just the filter and will be getting a prefilter very soon.

Hope this helps, there are a lot of guys that can give you more info but for the most improvement for the money the clutch kit is it. They run around 250 I think I bought a secondary spring for agressive tires over 30" and it was 295 total. John also provides machine work to the clutch but that is a later mod.
 
#20 ·
From what I've read on this forum, the clutch machining would be the best thing for low end torque. Its like having a lower gear. I think he charges around $350 for the machining work. I haven't gotten that far with mine yet, but its going to happen soon. I just can't get enough time between rides to send the clutch off. :)
 
#23 ·
You should also make sure to get rid of the funny looking belt intake and snorkle it up under the dash. Stock it takes in hot air from above the front head of the engine and in a short while the heat kills your belt.
 
#24 ·
I don't know why people keep saying that. There is no evidence of any belt failure related to the updated snorkel. Not one.

The opening is also below the cylinder head.

That was just a bad guess during the 2014 clutch problem. It was a fair guess, but it wasn't the cause.
 
#27 ·
Schmidt by your logic pulling air into the belt that is 180 degrees or more will help cool the belt better than air that is 60 to 100 degrees? I think not. Add in the heat the clutches make all by themselves just from friction and you have a recipe to reach 220-250 degrees at which point the glue WILL let go and the belt WILL fail. I have seen it many times on other machines that blow belts. Cool down your belt it WILL LAST LONGER 👍

Same reason your radiatior is on the front of the vehicle. To pull in cooler air.
 
#30 ·
By my logic, there is no evidence. Nothing more, nothing less.

Of all the Teryx's sold in the last two model years, only maybe 40 or so are retrofitted as you suggest—all people who heard the idea here. Yet all the rest aren't suffering from the rapid belt failures you predict, even in desert environments.

Further, when there was a problem, we saw evidence of it. And when Kawi fixed the problem, we saw a confirming decline in belt failures.

By my logic, just follow the evidence. That's all.
 
#29 ·
I like it! I couldnt bring myself to cut holes in my brand new toy tho so i ran mine up under the dash.
 
#31 · (Edited)
So what you are saying is there is also no evidence that it doesn't help? I never said it was the sole cause of the belt failures in the early 14 models that got the recalled primary clutch. There was obviously something wrong in the oem clutch.
What I am saying is that heat is a contributing factor which will lead to shorter lifespan of the belt. I never said if you don't snorkle it the belt will blow immediately. It just won't last as long as a snorkled, cooler running belt.

If heat is not a factor, why then in the sand dunes where it is hot as balls, do people REMOVE their belt cover completely? (Mainly RZR owners) its to intake cooler air :). Anyhow everyone is entitled to their own opinions.
Just my first hand experience and observations and 15 years being a dual ticketed journeyman mechanic [emoji41] haha. Cheers[emoji482]


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