MrLean

iTrader: (17)

I'm assuming you're at GRRC?

I don't think this class will last very long, based on what a lot of peoples reactions were when they announced it. They are running 13.5 and 17.5 classes last I checked, which is odd. Seems like there are already too many classes.

estill

iTrader: (14)

I'm at Tacoma RC Raceway. Next weekend is the Gold Cup race where they are running Stock and ProStock in both 2wd (21.5/17.5) and 4wd (17.5/13.5). The 21.5 2wd has been catching on at the club races as people are trying to get ready for the Gold Cup.

I can't say this is a bad decision. But, I'm a casual racer that mostly does open practice and races every month or two.

BuggyFan21

New Will Speed chassis announced:

https://www.redrc.net/2023/09/willsp...is-conversion/

https://www.willspeed.co.uk/products...4&_ss=e&_v=1.0

​​​​​

estill

iTrader: (14)

To close out this conversation the consensus was 29/72 for a 17.5 motor. I have to admit, it was fun. The slower motor removed the temptation to send it, and made you really focus on your driving line.

mrkab

iTrader: (3)

78 / 23 * 2.5 = 8.47 final drive ratio

That seems way too high. I'm at 78 / 28 * 2.5 = 6.96 on a 13.5T Reedy S plus and it gets hot enough even in 70 degree weather but it hasn't overheated even in 15+ minute practice rubs.

The other poster is at 7.2 (72/25) and 7.22 (78/27). I think that would be fine for mine if I didn't run it past 10-12 minutes. If I was optimizing for < 10 minutes maybe 7.5 (78/26).
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​​​​Just googling a bit and 7-7.5 seems a common FDR for 4wd 13.5: buggy.

akimrc

Hello,

i am building B74.2 carpet and i have a small problem.
Build the shocks per manual, but the rear shock spring cup touching the arm. Its moving like 1mm and blocking arm movement. Its not much, but...
Stroke is 27,5mm.
Eyelet +0mm.
Spring cup offset +0mm.
Internal limiter 0mm.
Position on arm is B.
Pills and geometry per manual.

Thank you.

jabroni racing

iTrader: (46)

13.5 Gearing Question, if your FDR(final drive ratio) is rea;;y close does it matter if its smaller or larger spur and how would it affect acceleration or anything??? for instance 72/28- 6.42 FDR 78/30- 6.5 fdr would the smaller sur have acceleration advantage?

BigBuckORamma

Thats really awesome to hear!
I was just up in Washington this last week, and i thought about bringing my car up and racing back at TRCR for the weekend. But all i had running was my 21.5 B6.3, and didnt want to become a mobile chicane in 17.5. Now i wish i would have brought it, showed up, and did some racing.

#NextTime

MrLean

iTrader: (17)

Use the +5mm spring cup

mrkab

iTrader: (3)

Nearly all of the 10x15x4 kit bearings (8 in total) on my B74.2D have failed in the first three track days with the car. No problems with any other size so far, and no issues with any of the replacements either. Both the pair on the wheels and 5 on diffs have failed. One seized entirely and caused some aesthetic damage, the others I've pulled before they get that far.

Track days are for tuning right now so I'm in the diffs pretty often and so I'm checking these often too. When they fail it doesn't even feel gritty either there's usually one spot that feels way off. When I checked all the bearings before the first track day I had noticed the 10x15 all felt and looked different too, they spun too freely and looked dry.

Very weird, don't know what to make of it but reminded me of the kit bearings they shipped dry.

Jamie007

Yep! I just went through the same thing. Had some bearings in the rear end fail, then the front end, then all over.. Ruined three weekends for me. Stock bearings are absolute garbage. I ended up ordering Fast Eddie's bearing kit, replaced all the bearings, I haven't had an issue since...

mrkab

iTrader: (3)

I've got a full set of ceramic from Avid as replacements but I was expecting the kit bearings to last a lot longer. I don't recall seeing bearing issues in the B6.4 thread and it's only the 10x15 so far, maybe the others are good.

But it making me wonder, when I get my B6.4 do I need to just throw away the kit bearings because these aren't very good imo.

edman4523

I had issues with my B74.2 bearings and I filled out an RMA and Team Associated sent me a replacement kit. I also recently built a b6.4 and I have had no issues with the bearings.

BuggyFan21

Maybe it's specific to batches of kits? I've had my 6.4 since release and raced it a lot. Not had issues with any of the bearings on it (I just give them a drop of thin bearing oil from time to time).

Alexv2024

iTrader: (2)

Personally I think its specific batches of bearings, I bought a 74.2 kit a few months after it launched and have had zero issues with kit bearings. I've ran stock and mod and broken other parts but never a bearing. I've been using 1up and similar light bearing oil here and there, but nothing consistently.

I also built it with adding light bearing oil, that possibly helped a lot.

I was building my new kits with pilot bearings since they always out lasted even b6.1 and .2 kit bearings and were super free spinning ceramic bearings, but pilots gone now. I think 1ups bearings are similar, but I haven't tried any personally.