Originally Posted by Sp Racer
Ok guys, here we go again!
I had a read of some of the suggestions on this thread, so I tried doing as suggested !
Ran a club meeting today ( LRP .12 Spec 3) , started by tuning the engine way rich on bottom and top end, to the point that it ran out of fuel at 4min 40...no power.
So I leaned it off bit by bit until it started to make power, by mainly the top end needle .
I got it to go pretty well, but it was very flat on the bottom ( clutch setting .4 gap, 1.2 mm pre-load / Kyosho RRR ), so I leaned off the bottom gradually until it was crisp, and added a bit of fuel to the top end to compensate.
Well, 4 minutes into the race, big lean bog out of every corner....up to that point, an absolute weapon...I had to richen the top end needle almost a full turn to stop it from happening, then, no power.
It seems to me that as soon as I get the engine tune to the point that it makes good power, I get this silly lean bog. If I tune it so it doesn't bog, then it's too rich, no power...
I've tried a few different pipe & glow plug combos, gearing etc and it seems to make little difference, surely I'm missing something?
Ok, Let me see if can help you sorry the bad english ;
I have race LRP .12 engines since the first one ,later sepc2 an spec3 now,
of course your head shims need to be correct by the % percentage ok
this engines likes and works perfectly with the botton en needle too rich, try to use aroud 9 turns opened dont worry its too much ok but works,
later this maybe you will never need to touch/tune again on the booton end
needle , to check if the botton end is fine , try this; run the car same way you run on the race, fastest you can around 3 laps , come to the pit, stop the car, and lift the front end of the chassis your car you will put the car almost on vertical the engine this time will want to rich a lot and want to die , here is the best point, if not you will need to rich a little bit more the low end needle, if the engine die before this the low end is too rich, this tip works because the car on vertical position makes the fuel inside of the tank goes easy to the carburator and make the engine rich alone,
Of course before you tune the botton end is better you tune the main needle , go to the track with main needle rich, your second speed maybe does not shift or shitf too late , start to lean 1/8 of turn each time until your engine show you a very good power so later this stop to lean or just go moore 1/8 maximum , later this go to tune the botton end like i told above,
The LRP engines does not work same procedure like nova based or anothers to have a good power on botton you need to work too rich on botton needle
Dont be afraid to rich a lot the botton end the more you rich better will be until the point of the engine die when stops
Try,
I hope will work for you