XXX-CR, 5.5 Sintered, no brakes!

Fiddybux · #1 27-12-2008

Hi,

Just fitted it in my XXXCR with a 2007 Sphere and 5.5 sintered motor, and the brakes really suck. I like brakes, so for me this is no good.

It's geared on an 88 spur with 16 pinion (should be about right yeah??) on a 5.5 sintered X11 motor.

Slipper is tight enough.

I've checked the stupid stuff like the wheel nuts being tight enough and the wheels hex's not being rounded (I've had this problem before!).

Also I've checked that the tyres aren't skidding and just losing traction.

Any ideas?

Southwell · #2 27-12-2008

Brake fets? Throttle pots on tranny?

Fiddybux · #3 27-12-2008

The FET's in the speedo you mean? Well they could be knackered I suppose, but the motor stops quite aggressively under no load.

The pots on the tranny are all fine - no probs with other cars with identical receivers and servos.

I'll have to give it thorough going over tomorrow in the light and test it properly in the street.

Would you say the gearing is ok anyway? This shouldn't make a huge difference to braking anyway though.

Southwell · #4 27-12-2008

I run 23/78 on a 78 on a 6.5, not sure what an 88 would be though, around 20 would be right?

Have you checked the speedo settings? Could be a dodgy motor i guess.

Fiddybux · #5 28-12-2008

Motor should be fine. The sintered rotor is relatively new too and it's never been allowed to get so hot that it weakens the magnets.

Will open it up to have a look though.

Southwell · #6 28-12-2008

Unfortunately you just have to keep trying things until you find out the problem. Ive had a practically new Novak motor keep cutting out so just becuase it's fairly new it doesn't mean you wont have problems.

Fiddybux · #7 28-12-2008

I had a good look at things this morning and seem to have made things much better.

Even though the speedo is from another car with identical receiver and servo, I thought I should re-do the speedo set up. This made a massive difference straight away. Don't know why but the settings can't have been right and the one-touch setup helped a lot. This is confusing as technically it should be no different. Sure its a physically different receiver / servo, but they are identical models. I don't get it, but it helped.

I also noticed that the road outside was icy in patches, so even though I couldn't hear skidding from the back tyres, they actually were skidding...and this will have been worse last night at about 9pm when I was trying it out.

So all in all, much better today. Thanks for your ear!

ottoswe · #8 28-12-2008

smaller diameter rotor gives less brakeing, but std 14mm should give more than enough.

i run 12.5mm and i use about 95% on EPA when running indoors

sly · #9 28-12-2008

Quote:

Originally Posted by Fiddybux

I also noticed that the road outside was icy in patches, so even though I couldn't hear skidding from the back tyres, they actually were skidding...and this will have been worse last night at about 9pm when I was trying it out.

9pm and how many beers Russ lol.