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Team Yokomo YZ-4 SF2

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Old 02-23-2022, 07:56 AM   -   Wikipost
R/C Tech ForumsThread Wiki: Team Yokomo YZ-4 SF2
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Last edit by: Cain
YZ4SF2 New Features:
NEW! Aluminum lightweight front and rear bulkhead
NEW! Aluminum lightweight motor mount
NEW! Lightweight slipper unit
NEW! Steering system
NEW! Front and rear suspension arms
● High durability Φ3.5mm inner suspension
● Bush type upper arm pivot ( (Inside)
● Battery position can be changed
● Roll center adjustable bush insert Rear hub
● Dart & carpet spring and stabilizer are also included

Setups and other information:

Predator RC Front Bulkhead Brace & Predator RC Brace Pics
PetitRC YZ4SF2 Setups
Yokomo spring chart
Vehicle check matrix (By Ray Munday)
Vehicle setup matrix (By Ray Munday)
Basic tuning for racing
SoDialed setup and pill calculator apps
How to Sand and Seal carbon fiber
Piston / Oil Tuning Chart

FAQ:
  • What is the difference between 2 gears and 4 gears in the gear diff? Please read these posts by Roger M.
Rear CVD Bone Modification to prevent bone ejection on crashes
  • Part# YOKZ2-01065B 66.5mm Bone
  • Remove the 1mm shim used on the stock CVD
  • install the 66.5mm bone
  • Reassemble

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Old 11-14-2021, 03:57 PM
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Default Team Yokomo YZ-4 SF2

https://teamyokomo.com/product/b-yz4sf2/


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Old 11-14-2021, 04:02 PM
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some additional pics:







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Old 11-14-2021, 04:04 PM
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and some more:



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Old 11-14-2021, 04:04 PM
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So got a race report here:

For the first round of our FMRC Winter Series on indoor carpet, FOSS EcoFi Status Ozite, track conditions were very tight lanes, about 6ft - 7ft lanes. Traction was about a Med-High I would say in comparison to say CRC Black Ozite. We are allowed to sauce so I used SXT 3.0.

Big thing as always on our track is rotation and torque. You really need to choose your lines for passing and with it being a very small track (sub 10 second times are possible when really going), you bobble and you could be down a lap before you know it.

First Heat:

During practice I started with some slightly worn cactus tires and felt they had sufficient traction to rotation decided to stick with them versus a fresh set. This was a good idea as based on my CAL3 running with a newer set, it wasn't as good. From the start I had a bit more push than I liked but the car was consistent, no weird kick out on the rear. I managed to TQ the round here with the fastest lap of 9.791 however my consistency could be better. Based on what I was seeing, I ended up changing the following:

- Yellow AE V2 front springs

Heat Two:

Since the car was good before, I decided to try and work on consistency and see if any areas I felt I could pick up some improvements. The car had improved rotation but I felt I could still get a bit more. After the resort that happened, I was in the later heat and saw that the first heat top driver didn't geat my previous TQ time so I decided to focus on staying in front but not push it too hard. Was a bit slower this time but still respectable. Based on what I saw I decided to change:

- Down half degree on rear toe


A Main:

This time it was time to let her rip. the few quick pre-race laps I did I felt the car was more free in the rear end like I needed but still very stable. Going back and forth with 2wd to 4wd definitely change the mindset on how I drive, with 4wd being more on power. From the beginning took off and held first the whole race, and based on what the timing system is sayiing looks like I may have lapped the field as well. Had second fastest lap of a 9.775 with the fastest set by another of a 9.430. My consistency though was significantly better and the car was pretty much on rails lol.

Here is the setup I ended with:



based on what I am seeing, for this track I would probably try the following next for a bit more rotation:
- 2mm on rear carrier
- inside position on rear shock tower
- Drop front kickup
- 1 corner pill on RR block versus 0.5 corner pill


Like the DTM3.1/CAL3.1 thread, I think we should also have a YZ4SF2 thread.
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Old 11-15-2021, 07:12 AM
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Originally Posted by Cain View Post

Like the DTM3.1/CAL3.1 thread, I think we should also have a YZ4SF2 thread.
Probably going to be a YZ4 SF2.1 or SF3 soon.
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Old 11-15-2021, 09:06 AM
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Originally Posted by Cain View Post
Like the DTM3.1/CAL3.1 thread, I think we should also have a YZ4SF2 thread.
IMO this only makes sense with a new iteration of a car (like the mentioned 3.1 versions), but not after a car has already been discussed in a thread for such a long time.
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Old 11-15-2021, 09:38 AM
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Originally Posted by 4times View Post
Probably going to be a YZ4 SF2.1 or SF3 soon.
With how things went with covid and all and the car was released just last year, be curious if they update anything, to that level, maybe a running change on front bulkheads.

Originally Posted by DirkW View Post
IMO this only makes sense with a new iteration of a car (like the mentioned 3.1 versions), but not after a car has already been discussed in a thread for such a long time.
Gotcha.


So back to some discussions on the car, how have things been working out for you all with the 6 dig carriers?

the wiki has been updated with the 66.5mm bone modification to prevent the ejection of the CVD bone on the rear of the car

Last edited by Cain; 11-15-2021 at 12:52 PM.
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Old 11-22-2021, 05:13 AM
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Amain dropped price to $399 so probably a new version coming soon.
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Old 11-22-2021, 09:05 AM
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Originally Posted by 4times View Post
Amain dropped price to $399 so probably a new version coming soon.
Possible or its a black friday sale thing.
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Old 11-23-2021, 09:38 AM
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Originally Posted by 4times View Post
Amain dropped price to $399 so probably a new version coming soon.
That could because the CAL/DTM 3.1 is priced around that. They have had the YZ2T on sale for a long while and there is no word on a new (per me talking to Maifield).

With that, I had the chance to see but of Maifield's cars in Oct. I could see some of the changes to the 2wd, which I asked him about, and the 4wd didn't have anything new on it that I could see. I don't suspect to see a new 4wd within a year.
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Old 11-26-2021, 08:47 PM
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What are the spur options for this car? Anything under 80?
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Old 11-27-2021, 08:08 PM
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Originally Posted by ChadoSan View Post
What are the spur options for this car? Anything under 80?
You are able to use the AE spur if I'm not mistaken if you are going below 80T.
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Old 11-28-2021, 07:58 AM
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I am testing another spur gear assembly setup on here too see if its lighter, will report back if it works out.
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Old 11-29-2021, 06:42 AM
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Originally Posted by F1nalized View Post
You are able to use the AE spur if I'm not mistaken if you are going below 80T.
I'm running a Yokomo 3 pad 78 tooth on mine with no issue
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Old 11-29-2021, 03:50 PM
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Originally Posted by Scott R View Post
I'm running a Yokomo 3 pad 78 tooth on mine with no issue
What part number
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