137LikesTeam Associated RC10 B5m Mid-Motor & Rear Motor Thread
04-22-2024, 12:09 PM - Wikipost
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03-16-2014, 10:08 PM
#6376
The 2.0 was mid motor and had the rocket rc brass upgrades and it was a smooth car but for me I couldn't push it as hard as the b5m. The ae car with very little tuning was faster for me and seams to hold more corner speed and be more forgiving.
03-16-2014, 10:14 PM
#6377
even tho total volume is larger, turbulent flow becomes the greatest factor in pack. because the holes are smaller they resist the flow of oil from bottom to top. volume flow is not pack, the resistance to flow is pack.
i terms of feel...for example, with a 1.6 piston in the b4.2 i ran 32.5wt in the front, with a 1.7 piston to get a similar on track feel it required 37.5wt to feel stable, but with a 1.4 piston and an additional hole the shock felt the best with a 35wt.
another way to show this is that in the b5m kit, it uses a 1.7 piston in the rear to use the same 32.5wt oil all around, while most people run a 1.6 with 27.5wt in the rear.
and i am not disputing that the 2x1.6 has more pack then the 3x1.4 as it also adds up to slightly more volume then the 2x1.7 as well anyway.
im most likely wrong. but oh well, its a forum not a text book.
i terms of feel...for example, with a 1.6 piston in the b4.2 i ran 32.5wt in the front, with a 1.7 piston to get a similar on track feel it required 37.5wt to feel stable, but with a 1.4 piston and an additional hole the shock felt the best with a 35wt.
another way to show this is that in the b5m kit, it uses a 1.7 piston in the rear to use the same 32.5wt oil all around, while most people run a 1.6 with 27.5wt in the rear.
and i am not disputing that the 2x1.6 has more pack then the 3x1.4 as it also adds up to slightly more volume then the 2x1.7 as well anyway.
im most likely wrong. but oh well, its a forum not a text book.
I like that. I may need to steal that one!!!
03-16-2014, 10:18 PM
#6378
TQ of 17.5 was a MM car so both can work. We have proven time after time that MM works on both low and high bite. Don't believe me....the TQ was from LSR in Sacramento which is low/med bite. It's a personal preference and from what I've seen/read some would rather be told a set up rather than test some things out. The winner of Superstock also from LSR.
03-16-2014, 11:00 PM
#6380
In my eyes he could be the most mizzundastood doods in RC. A long time ago I thought he had pity only for old people like me but I quickly saw he helps the 'kids'(and actually anyone who asks). Damn I wish he would just have loosened up their wheel nuts. He's TQ of the pot stirring
Last edited by Lance Tanner; 03-16-2014 at 11:17 PM.
03-16-2014, 11:09 PM
#6381
Tech Addict
hey jake.. no worries .. its hard to help sometimes as you can only convey so much over a few lines here.. especially without seeing the car.
I was at the track the other day and there was a guy who was saying how much he didn't like how the car handled.. I asked if I could take a look.. he had all his shocks different lengths as when he threaded the ends on he didn't make anything equal. not to mention several other things like one front steering block spacer was behind the block the other infront... I spent 10 minutes on his car and he couldn't believe it was the same car after.
ya the weight bias totally changes with a square or saddle over the shorty.. nomatter where you place the shorty you loose or gain something somewhere as compared to the larger batt... and you only gain a ounce with the bigger batt.
I was at the track the other day and there was a guy who was saying how much he didn't like how the car handled.. I asked if I could take a look.. he had all his shocks different lengths as when he threaded the ends on he didn't make anything equal. not to mention several other things like one front steering block spacer was behind the block the other infront... I spent 10 minutes on his car and he couldn't believe it was the same car after.
ya the weight bias totally changes with a square or saddle over the shorty.. nomatter where you place the shorty you loose or gain something somewhere as compared to the larger batt... and you only gain a ounce with the bigger batt.
03-17-2014, 12:21 AM
#6382
diameter to surface area is a more complex equation
1.4mm hole = 1.5393804002589986 square mm of surface area
1.6mm hole = 2.0106192982974678 square mm of surface area
so a 3 hole 1.4mm piston will be about 4.6 sq mm of opening
2 hole 1.6mm piston will be 4.02 sq mm of opening, thusly making the opening smaller than the 1.4mm piston. I used this simple online calc to do the geometetry for me
http://www.onlineconversion.com/circlesolve.htm
1.4mm hole = 1.5393804002589986 square mm of surface area
1.6mm hole = 2.0106192982974678 square mm of surface area
so a 3 hole 1.4mm piston will be about 4.6 sq mm of opening
2 hole 1.6mm piston will be 4.02 sq mm of opening, thusly making the opening smaller than the 1.4mm piston. I used this simple online calc to do the geometetry for me
http://www.onlineconversion.com/circlesolve.htm
03-17-2014, 06:41 AM
#6385
Tech Regular
[QUOTE=Grasschopper;13102737]Well it was a rough day for my B5. Broke the front shock tower in practice before the heats even started and split the front left shock end in the A Main.
Other options?
TLR 22 shock ends will work. Part number TLR 5095
Other options?
TLR 22 shock ends will work. Part number TLR 5095
03-17-2014, 07:37 AM
#6386
who (company) has a good assortment of metric shims? to do some of these changes I need a stock up on all sorts of shims - i'm a slight stickler on this. Tried the 3mm trailing and ran out of 1mm shims so i had to wing it with the plastic black .80mm hub spacers. ran out of those too.
03-17-2014, 07:58 AM
#6390
re: hooking can be caused by a few things. I think most of it in my case is the difference between these pizza cutter panther front slicks and the relatively flat rear panthers. Really want something flatter up front. Also I have been trying to lock in my rear end more since the car drives like a lazy cadillac which requires me to back peddle on the driving a lot compared to my RMs as i was getting the hooking while trying to drive the car through the corner more. For now though, I've mostly eliminated this with roll center changes. also switched to hub BBup and went to short WB. Part of my other problem is the weight transfer to the front end is not exactly fluid. I'm using a shorty and have moved from the back towards the front but the big foam pad is still up front at the moment. I haven't worked on any front shock adjustments outside of moving the bottom to the inside hole, tried out the 3mm trailing which with the unfortunate lack of proper spacers didn't give me a clear concise answer i was looking for. Just too inconsistent. - no fault of the car, just not enough shims on my end!
really just tinkering around right now. car is about bulletproof *KNOCK ON WOOD* Only issues are trying to find the sweet spot on loctite so things stay but don't get stuck in (yes its blue, even an ae bottle!) , and the long long screws. power screwdriver coming this weekend!
really just tinkering around right now. car is about bulletproof *KNOCK ON WOOD* Only issues are trying to find the sweet spot on loctite so things stay but don't get stuck in (yes its blue, even an ae bottle!) , and the long long screws. power screwdriver coming this weekend!