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Post by lesbaldry on Feb 5, 2009 8:00:51 GMT
hi , at the begining of 08 when we started to use bl we were all advancing our timing on our motors but, when the air temps come up the motors start to fail ! when i say fail they just give up or have no resistance when turning the arm . due to heat ! normally when you up the timing on the motor it will run a lot hotter , more so that upping the fdr hth glenn Yep some of us found this out too with the lower winds.but for some strange reason the very low reving little 17.5 seems to like a bit of advance(in certain conditions..low grip/cold)...non of us yet have run this "weird " but likable little motor in race conditions at other tracks yet..or in high grip/ temps(a different story!!) and I expect a steep learning curve on the horizon..and perhaps a few tears too ....A trip to Aldershot is on the cards shortly
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Post by otr on Feb 5, 2009 8:43:54 GMT
I have run the Losi, the Lrp and the Novak 17.5 motors and to be honest find it hard to see much difference in the heat of battle. The Lrp seems a bit smoother perhaps than the Novak which feels a bit punchier. The Losi seems somewhere between the two. I have been running pretty similar ratios on all 3 motors. Between 3.2 and 3.4 seems to be the OK and that is without touching the timing. Going much further outside of these seems to lose power to me. Either in top speed or punch. Have run 17.5 at Yeovil, Bashley, Cotswolds and Aldershot and not really had to make much of a change to ratios. Minor changes only really.
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Post by lesbaldry on Feb 5, 2009 9:20:58 GMT
I have run the Losi, the Lrp and the Novak 17.5 motors and to be honest find it hard to see much difference in the heat of battle. The Lrp seems a bit smoother perhaps than the Novak which feels a bit punchier. The Losi seems somewhere between the two. I have been running pretty similar ratios on all 3 motors. Between 3.2 and 3.4 seems to be the OK and that is without touching the timing. Going much further outside of these seems to lose power to me. Either in top speed or punch. Have run 17.5 at Yeovil, Bashley, Cotswolds and Aldershot and not really had to make much of a change to ratios. Minor changes only really. ....my feelings too...Hi slushbucket...who are you? ....your intel and feeling on perfomance at those tracks would be handy....If you are prepared to share??
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Post by otr on Feb 5, 2009 11:53:21 GMT
There is not a huge difference to be honest. Ratios between 3.2 and 3.6 depending on the track although you need to make sure you do not lose out on performance in the tricky bits just to gain a few feet on the straight. Would suggest a really good handling car is best option and stick to a conservative ratio. You will gain more by carrying corner speed than being ballistic on the one and only straight on any track.
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Post by lesbaldry on Feb 5, 2009 12:51:42 GMT
There is not a huge difference to be honest. Ratios between 3.2 and 3.6 depending on the track although you need to make sure you do not lose out on performance in the tricky bits just to gain a few feet on the straight. Would suggest a really good handling car is best option and stick to a conservative ratio. You will gain more by carrying corner speed than being ballistic on the one and only straight on any track. 3.2'ish works for Cotswolds/Aldershot???....interesting!...I went as low as 2.9 at the CotSwolds but it was cool on practice day..I had plenty of speed (std timing LRP) I had a sneaking suspicion we would'nt need "silly" ratio's due to the motors narrow power band and low RPM ps Hi *** "you old bean"
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Post by Reuben on Feb 5, 2009 13:02:59 GMT
I would like to get to Aldershot for a race day to test my 17.5 before the slcc starts.... looking at aldershot's calender they seem pretty busy upto the slcc date. So we should start looking at getting up there sooner than later? and obviously a dry / not to cold day?
ps. Yes some more info on the findings of running the 17.5's at these larger tracks would be of a REAL! help.
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Post by otr on Feb 5, 2009 13:22:25 GMT
Les I have tried going below 3 as a ratio with the 17.5 but to be honest could not find a lot of difference on the bigger tracks. Just seemed to be struggling a bit on the infield sections but maybe it's in the mind. Anyway I have found the car really happy (if you can say that) at the ratios I have been running so tend to stick with it. No heat issues even running the under/over body.
Have run the same ratios in full wet conditions and they were fine. Just needed to turn the throttle down a bit and all was really OK.
You can easily get talked into going with much higher ratios when people talk about much larger tracks. The 17.5 in my opinion does not improve significantly by doing that.
There appears to be a power band in these motors and with the LRP in particular it just seems happier between about 3.2 and 3.6. Outside of this it seems to "go off"? but even that is speculative. It is easy to "think" yourself into believing the car is going faster/slower but only lap times show the truth.
I stand by what I said though. Get a well set up car and your lap times will be better than keep messing about with ratios.
ps. Nice to be back Les.
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Post by otr on Feb 5, 2009 13:25:00 GMT
On the other hand Les, if you are an old git who struggles to keep up then messing with ratios may be a help.....
Sorry, couldn't resit it. LOL
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Post by lesbaldry on Feb 5, 2009 13:55:07 GMT
On the other hand Les, if you are an old git who struggles to keep up then messing with ratios may be a help..... Sorry, couldn't resit it. LOL ...... Cheers for the educated info,it will save some time..your superior years out weigh my limited experience...LOL
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Post by otr on Feb 5, 2009 14:33:01 GMT
One thing I have not played with much is the speedo settings. Not sure how much you can do or how much difference they can make. Also I assume different speedos have different parameters you can change.
I bet you have already played Les so is there anything to be gained?
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Post by lesbaldry on Feb 5, 2009 14:57:18 GMT
One thing I have not played with much is the speedo settings. Not sure how much you can do or how much difference they can make. Also I assume different speedos have different parameters you can change. I bet you have already played Les so is there anything to be gained? Not realy...I played in the early days with taller gearing and low punch to keep the temps down but now (unless wet)its max punch,fiddle with FDR's and moniter the temp on the day.
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Post by Reuben on Feb 10, 2009 14:03:21 GMT
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Post by mattsedgley on Feb 10, 2009 18:17:42 GMT
They've been out for a long while i think, I'm pretty sure Ian Loyd has the rear plate It looks like a bolt on Heat Sink, I suppose having the holes only at one end allows for heat to disapate quicker? there'd be no real air flow i don't think particularly with the end of the can still being sealed and no type of fan on the rotor (ala orion style)
How did you find that New Trinity motor from the states Reubes? Is it the next big thing?
Matt
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Post by Reuben on Feb 10, 2009 20:10:05 GMT
i didnt get the Trinity motor from the states in the end, loads of people said they have been blowing them up at a rate of knots! But i do have a new 17.5 and we will see how it goes sunday.
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