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#1
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xb4 "chassis flex settings "??
Hi , can someone exsplain the chassis flex settings please , obiusly i know the less screws gives the chassis more flex for low grip , and more screws less flex etc ( i know im a bit dumb !! ) for high grip .
I normaly run my xb4 with just the 4x centre screws removed , but on sunday at the mid south reginals at torch ( my local and a cracking track !! ) i saw different cars/drivers , running different settings .. Some had the outer front and rear screws removed , and some had the entire rear end screws removed .. Soo at what point / track conditions would you change the flex settings ?? |
#2
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I found it didn't help grip at all on the super slippy indoor tracks i run at over the winter. I tried various combinations of screws, and couldn't tell the difference. It certainly wasn't the magic answer to my rear rotation and grip problem on the polished and gym floors. Now i'm outside i've put the full-length chassis brace on and all the flex screws in. car feels spot on.
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Team Yokomo - YZ-2CAL3 | YZ-2DTM3 | YZ-4SF2 | YZ-2T | YZ-2DTM Worlds | YZ-2DTM x2 | YRX-12 x2 ------------------------------------------------------------------------------------------------------------------- 10electric | Batley Buggy Club | YORCC | RHR | MB Models --------------------------------------------------------------------------------------------------------------- |
#3
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I found that in conjunction to other setup changes i had made, removing the 2 rear screws helped make the over rotation of the back less of an issue on a mixed gym/slippy floor and carpet.
I also went to 5k front and 3k rear diff oil with 25wt shock oil in the rear with kit springs and 3 hole pistons. was a lot easier to drive However it was also a new set of tires front and rear which made a massive difference. even without rollbars i found that i was grip rolling loads on the carpet and had to adjust my driving to suit |
#4
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I find that the more flex screw you remove the more lazy the car becomes . Max flex is better on bumpy tracks and no flex is more precise in and through the corners . I'm trying a full length top deck tomorrow night so it will be interesting to see how it helps or not .
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#5
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Jerry |
#6
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I was also wondering what different configarations do and for when the grip is inconsistent .... cheers shaun |
#7
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I'm sure the flex effect will be more noticeable on high grip tracks though.
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Team Yokomo - YZ-2CAL3 | YZ-2DTM3 | YZ-4SF2 | YZ-2T | YZ-2DTM Worlds | YZ-2DTM x2 | YRX-12 x2 ------------------------------------------------------------------------------------------------------------------- 10electric | Batley Buggy Club | YORCC | RHR | MB Models --------------------------------------------------------------------------------------------------------------- |
#8
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as said above the tower and weights make the main difference. having said that since i have added a full topdeck i have found the flex is most equal with no screws and this also opens up the setup window to allow the car to be 90% right and quick as opposed to needing to be perfect.
any questions feel free to pm me Nathan Ralls
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www.rallsracing.com HPI, Answer Rc, Rc Disco, Pace Design |
#9
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Yep, throw some weight under your lipos. Works a treat! How much? I had 90g under my lipos. It's will be reduced. But I have 2 45g pieces of lead. Will cut each one in half and try it that way too. But car was ace first day out (yesterday).
Check out this video on YouTube: http://youtu.be/90qEJ3GYXaY
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Xray XB4 2wd & 4wd Xray T4'13, T4'15 & T3'11 (wet car) Mardave CE Supported by RC Disco and Team Powers UK Favourite Model Shop....MB Models! |
#10
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#11
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I've just got some lead flashing cut into lipo shapes, which are 62g each, so I've removed the triangle weights. To be fair, i'll probably end up cutting them down, as it was fine with 50g/side. I found I could use the under lipo foam to pack the smaller weight into the space and keep it secure (from sliding). I'll probably cut down these bigger sized pieces and use foam to keep them towards the rear of the lipo trays.
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Team Yokomo - YZ-2CAL3 | YZ-2DTM3 | YZ-4SF2 | YZ-2T | YZ-2DTM Worlds | YZ-2DTM x2 | YRX-12 x2 ------------------------------------------------------------------------------------------------------------------- 10electric | Batley Buggy Club | YORCC | RHR | MB Models --------------------------------------------------------------------------------------------------------------- |
#12
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Where is it? What electrics you using |
#13
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Kinda looks like the Coventry track.
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Model Junction, Boughton Raceway. |
#14
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That will be because it is the Coventry Astro track
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You Have 20 seconds to comply! |
#15
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tuesday for the towers if the postman gets here and we will be releasing the weights in the next few weeks
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www.rallsracing.com HPI, Answer Rc, Rc Disco, Pace Design |
#16
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soo the under lipo weights makes a big difference then , i thought my xb4 was a fat little bugger anyway weighing in at 1700g !!
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#17
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cheers shaun |
#18
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Yep! It's Coventry.
Motor is Tekin Gen2 6.5, LRP Flow w/v3.3 offroad firmware, HPI Plazma 5600's. Not sure if I was running boosted or not in this vid. Boosted its mental but to be honest it made the car smoother throwing some in but since I was practicing and sometimes driving for 10-12 minutes I turned it off. I was running pretty much kit but now I've gone for a softer set-up running 6 hole pistons all around. I was also running with all screws in chassis but I must start experimenting with this feature.
When I spoke to a fellow racer who has been racing this car it was mentioned that the flex is front to back and not of a twisting action. I didn't know that. I also loaned my weights to another person running the XB4 and he said the adding the weight settle the car down and made it easier to drive. I've now glued them in.
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Xray XB4 2wd & 4wd Xray T4'13, T4'15 & T3'11 (wet car) Mardave CE Supported by RC Disco and Team Powers UK Favourite Model Shop....MB Models! |
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