Originally Posted by LOW ET

here's what i found on a setup sheet for a 1/12 scale,

single cell lipo
lrp 13.5t
lrp spx, profiles: 2-8-1-1

Originally Posted by cyanyde

48p or 64p?

Originally Posted by Benzaah

We had an interesting session at the local track last meet. 3 guys had bought the spx and the x11 10.5 so it was going to be interesting to see the speed differences and gearing choices. We have another couple of guys who were waiting for these speedies so there was a bit of a buzz in the pits wanting to see who did what and how it all worked out.

Guy one kept his gearing at 6.0 with profile 7 all day when we usually run around 4.8 to 5.1 for 10.5. This was the 4 teeth he had read about here as well so this is good thinking. He was quick all day and came 3rd overall but he was more playing with car set up as he was previously using the car in Mod. He was more than happy with the performance he was getting and will have a bit more of a play with gearing next round thinking maybe another tooth down might find that perfect balance.

Guy two did not heed the warnings of us other spx users and kept his gearing at 5.1 and profile 7. He set fastest lap of the day in round 1 and commented how his car was flying. 2nd run he thermalled his motor and that was the end of that. He then put in a new Losi 10.5 and kept everything the same and commented how the losi felt slow compared to the LRP motor. He went down 2 teeth with the new motor on run 3 but was not really willing to try anything out there with his gearing and was willing to let us try things and run conservative. I guess thermaling a motor day 1 is not a nice feeling.

I did the exact opposite to these guys and went a bit wild with my gearing. I stuck with profile 7 all day till the last run when i tried profile 8. To start off i tried 6.3 with p7 which was good and had plenty of speed. I then took it down to 5.8 to see if there was much of a difference. The car was slower and did not have the same amount of punch or top end as 6.3 and the boost did not kick in as hard or when it was needed. I then went all the way up to 7.0 which did the same at going down to 5.8 and it was a little bit soft and not up to pace. At this point i should have switched to profile 8 to see if that made a difference but did not do this for some reason. For arguments sake i then changed back to a 6.0 and found a pretty nice sweet spot for the track at profile 7. Funny how this is what Guy one chose straight away and was happy with all day. After thinking a little more about how the spx works i set the car back up to 6.3 and put profile 8 on this time and the car was going really slow and had no punch. I thought this was weird but goes to show that the higher profiles really need that high gearing to work. I put it back to profile 7 and kept it at 6.3 for my final run as it was getting late. The car was an absolute rocket but got really hot after 3 minutes so i pulled the run and was happy with my first days testing with this new set up.


From all of this I suggest that anyone using this speedy throw out the rule book for gearing and start re writing it for yourself and your own track. Finding that sweet spot where the boost kicks in at the right time is the key as you can have all the speed at the end of the straight but using the extra punch out the corners and up the hills in our case is where its at. All the gearing advice i got was pretty tame but there were a couple of posts that i took heed to.

I would suggest to new users try profile 7 and lose 4 to 6 teeth on the pinion from what ever you are currently running and just temp after 3, 4 and 5 minutes on your first couple of runs and move forward or backwards from there. And profile 8 I would drop 6 to 8 teeth on the pinion and move forward or backwards from there.

i will post another report after next meet. We should have 5 running this speedy then and it will be on for young and old.

Originally Posted by kn7671

Interesting, my SPX settings are 2-7-0-0 for 17.5 or 13.5 1/12 or WGT 13.5.

Originally Posted by kn7671

I run the the SPX in my Pro-10 on Profile 7 with a Novak Booster and the Thunder Power 5000mAh 1s LiPo too, but use a Tekin Redline 13.5 or LRP X-11 13.5 Stock Spec motor. Motor timing on the Tekin is 10-deg, LRP X11 is stock.

I run an 88/36 combo with 56mm F/R. This yields approx a 72mm Rollout. Our tracks back straight is about 110ft long.

Originally Posted by Shev

wow, from what I've experienced and what I've read, everyone has a different set up. I'm trying to get back into this after 12 months and sooooo much has changed. Where are people heading for a starting point regarding Final Drive with the SPX on level 8 for a touring car with a 17.5. Is there such a thing?

Thanks

Originally Posted by Shev

wow, from what I've experienced and what I've read, everyone has a different set up. I'm trying to get back into this after 12 months and sooooo much has changed. Where are people heading for a starting point regarding Final Drive with the SPX on level 8 for a touring car with a 17.5. Is there such a thing?

Thanks