Why isnt my mission as fast as everyone elses?

[Jackv202]

Hi,

I dont quite understand why my mission is only just as fast or slower than other peoples with 27turn motors when i have a 19turn motor that is new.

I dont really know how to set up my car so it might be that.
I am using the 17tooth pulley, 86t spur gear and a 28t pinion gear.
Demon 19turn motor. 3000 and 3300 batteries (one matched 3300).
Also the rear diff feels quite gritty, could this be the problem?

Thank you for your help

Jack Varty (if you need any more info then please ask)

[MattW]

Jack, That really doesn't give anyone much to go on. i'm not convinced your gearing is right, but i haven't run 19 turn (just doesn't seem right to me!!!). It's a good idea to check the ratio of others running same/similar motors on the same track. Although for those that have they might need to know what sort of track you are running on. i.e small, large, tight. flowing?????

You don't say what speedcontrol you are using, it might be relevent. I get the feeling that your cells are "budget" cells. Realisticially if that is the case they probably won't have the power of "top" cells. Although again i suspect that isn't all of the issue.

The rear diff being gritty probably isn't the problem. Although it could be, if it is the diff bearings or wheel bearings that are causing it to be gritty. Be sure to check all of your bearings, especially the layshaft bearings as i have seen some of those sieze up before. Just check that the whole transmission is free.

You should run a 19turn motor the same as a stock (gearing wise). Seems way over geared to me, (i think you run at basildon?is it you?) if it is you are way over geared for that track, the people who run stock realy put lots of time and effort in to there cars, thats why they are fast....with a 19turn you should have loads more punch and about 25-50% more top end, thats what i found when i ran it any way.

[Remo]

First check your gearing with others running with you. What track size is it and what is the average lap time there...?

Study how others are faster than you... is it down the straights or they are just quicker overall? Are they just carrying more corner speed than you?

Check the drive train, remove the pinion see if the drive chain is nice and free... Gritty diff wont affect that much as a diff dont really work in straight line....

Gearing 19T is similar to 27T and often the same.... 19T gives much more punch than 27T hance better lap times that 27T but top end is less dramatic in difference in my experience, so it is not uncommon that 27T in good hands can often keep up or in front a 19t... ;)

[Jackv202]

i do race at basilodon, the track is quite small and fairly technical with only one longish straight (50ft roughly). The fastest lap times are about 11 to 12 seconds for stock 27 turn, but mine with a 19turn gets in the low 12 seconds. They are faster overall, in straight line speed and acceleration. If i am way overgeared then please tell me what gearing i should use (pinion and spur size etc). The speed controler is a no limit PC Line esc. Though i havent heard of anyone who knows it (cost £45. My batteries are 2xsanyo 3000 1xGP 3300 and 1xGP 3300 matched pack. The car's bearings are all quite free and none of them are locked or gritty and are relubed regularly and cleaned quite recently.

[Jackv202]

im also using the 1.8:1 ration instead of the 2.1:1 ratio, could this be why it is going slower. Does it make that much difference in speed?

You shouldnt run a 28pinion at basildon, just asking for a smoked motor! With the 86spur you should be running about 23-25 pinion, 25at the most. You also need to maintain the motor in top condition all the time (clean brushes, change brushes, skim comm, clean brush hoods etc...) The people that are faster than you in 27t all do that, if they dont they are just lucky that there car is fast.

[bigrab]

it could be the motor or the speedcontrol.......it could just be that the motor needs a good skim...if not, try changing the pinion to a 23........

robin........

[Barry_Hughes]

I run 19T at a small track at Risby.

I use the 20t pulley 22 pinion and 83 spur.
Don't forget to turn the layshaft mounts if you do change pulley! The 17T pulley is supposed to give a bit more punch, but everyone I know always runs the 20T.

So with the 86 spur a 23 pinion is about the same.

Ensure your belts are free as possible, i.e. check your belt tensioner, some people move it up thinkinkng the belts should be tensioned. This is not the case, mine with grey front belts is set very low, you can almos push the belt at the top down on to the belt at the bottom. Just ensure they don't skip round the pulleys.

[Jackv202]

the belt tensioner i set very very low, though i cant get close enough to touch the lower belt if i push it down (if i push it down it is about 5mm-8mm away from touching the bottom part of the belt). i am also using the grey belts. i am going to upgrade the motor to a 10x2 by putting an infinity armature from apex models in the D5 can.

[Barry_Hughes]

If you are running on a small track I wouldn't recommend running a 10Double. A 19T should perform far better, a wind like the 10D is more suited to a far larger track.

Speed is all about finding the right ratio for the motor, and driving to strengths of the motor. for example in stock you need to carry the speed into, through and out of the corner, modified you can go quicker to the start of the corner, brake then use the power of the motor to pull the car out of the corner.

Also driving the correct lines to carry the speed out of the corner onto the straights is important, just boltimg a hotter motor in does not compensate for learning these skills.

[mark barord]

Jack
speed through the corners is the thing!
I have sent you a p.m and I will gladly help you all i can. I won't be at Basildon this week (14th Jan) but Iwill be the week after.

[axpayne]

Hi Jack. When you say your car isn't as fast as others are you talking about the straight line speed down the straight or your time over the race distance. ? If it is the second, look at the car set up compared to others and the driving line they take.

If you are slower through a corner, you will have less speed down the straight.