what he is saying stampy is a 5.5 is way too much for a b4

that what the guy was racing it with si coe

actually Mark, i was trying to impersonate the usual advice that Stampy gives out and see if he likes getting completely wrong advice. I guess he doesn't.

But your point is equally true, 5.5 in a B4 is a handful for anyone

I was told that Neil Cragg ran a 7.5 in his B4 at Worksop last series. If a 7.5 is fast enough for Neil then its fast enough for anyone. 5.5 in 2WD will just take the fun out of the driving i reckon.

Is it a eazyrun 5.5turn motor with cooling ribs around it?

If so it's a 480 sized motor instead of a 540 size. This means you can't compare it or ask anyone advice on it either because noone runs that size motor. Your MadRat and your B4 have the same internal reduction, so if you already know how to run it in the madrat gear it the same for your B4.

Otherwise you could always do what other people do and time your runs. If your speedo is boiling after 4 minutes you are too long and if it reaches top speed immediately it's too short.

By the way my BMW read differential has a final drive ratio of 4 in 1 hot exhaust. Do I have to squish a Banana on my left front tyre to make my fuel tank into a pram? What happens when I unscrew my bellybutton.
Wibble wibble...

i have no idea what you started on about there Sparrow, but that last paragraph made it all clear! :P

take it up with si coe it came with it car he told me he raced it a bury all the time i was asking about gearing it not a arguement guys ask si coe at bury

sparrow its the same size can as my mamba motor mate

its a 6000kv motor

Its a full 540 sized motor

Actually I used an LRP X11 7.5t with an Orion esc when I had the car. The Ezrun 5.5t lived in my D4. When I sold the car I offered it with a 9T motor (one of the 380 sized finned ones) but that idea was deemed to slow so I offered the 5.5t instead.
I only raced the B4 one time with that motor/esc combo. It was a bit wild as I warned you it would be, but drivable. The Ezrun 5.5t is only really equivalent to others 6.5t's anyway, and a few people use them in 2wd.
In any case the gearing I supplied it with (can't remember now but suspect it was an 18 tooth pinion) was correct being the same ratio as had been successfully used with that motor in my D4 all summer.

its a 20 pinion simon

i ran with 5.5 novak with my old b4 ft. was std. spur (84t am i correct) and ran with pinions between 18 - 21tooth. we cant really tell you what pinion to go for as all tracks are different. and require differnt gearing. i manily ran with 18tooth pinion on standard spur with throttle turned down and top speed turned down on the transmitter

the reason for the overheating is that you played about with your esc. if you put more brake on the esc, it has to work harder and generates more heat, causing it to cut out (so you dont blow it up). 7minutes ?? thats surley long enough?

reset your esc to factory settings and try from there

Good point - as you stated I'd dialled all the brake away, mostly as it really wasn't needed in the D4 and having too much made it overheat indoors. Actually I never overheated that particular esc, just the similar one in my Cat, so adjusted both the same. Back some of the brakes away and it will be fine, its not a gearing issue - at least it never was in the Cat!

just reset the esc cut the brakes down a bit thanks si

i done the brakes and it fine thanks si coe
i think it was to do with the grass over long and wet but still ripping the grass up

driving in long grass will put the motor under far more strain than short grass or astro. this will obviously heat up the motor faster. it's not a good idea to race them in long grass as it will also wrap around the drive shafts

thanks jim 76