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Policar Lotus 72


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#21 shadow_rusty

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Posted 07 January 2016 - 09:28 PM

I fitted MJK pro slot 21x11's to mine. Pretty good fit and they don't look out of place.
Even With the 14k bwa in it, boy oh boy does it have brakes, and is surprisingly quick lap time wise arround my small track.
That said, you are definitely hitting the rev limiter very early.

As for the gearing, Unfortunately, the pinion is a different size and pitch, so replacement pinions are out of the question.
Crowns ate a specialist item, and I don't think policar have released the axles, so gearing is stock or stock.

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#22 Peter Gunn

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Posted 07 January 2016 - 09:48 PM

Top Slots and trains over web site over here have the spare axles along with other spares rusty, if you have a problem getting them PM me and i'll get them for you they are 16 and 18 tooth and the standard one is 17 in the car.

#23 charlesx

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Posted 08 January 2016 - 05:31 PM

Hi SR.

One of AUSLOT's sponsors - Slotraceshop - also has them in stock. 16, 17 and 18 tooth I think. About $10NZ if memory serves me right

I am surprised you would want one until car well sorted though. I still have to run my car on decent wood track but it certainly flys on my short temporary Scaly track. Car is so light I would have thought it will pull well over a wide range of conditions.

Confirm great brakes too.

Wood track I am likely to try on has several very tight curves so should be a good test. Will report further ASAP.

Regards Chas Le Breton

#24 shadow_rusty

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Posted 08 January 2016 - 09:17 PM

We run BWA 14k motor's here in our classic F1's, and the gearing is just way too short for it.
Yes, I did notice that NZ has them, and I'm hoping a friend places an order there shortly, and I'll get my axle with it.
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#25 charlesx

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Posted 09 January 2016 - 11:16 AM

Sorry SR. Forgot you said you changed motor.

Regards Chas Le Breton

#26 dangermouse

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Posted 09 January 2016 - 02:25 PM

So what ratio are you heading for SR

cheers
David

#27 shadow_rusty

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Posted 09 January 2016 - 02:35 PM

Arround 22mm rollout is a good start for our smaller tracks, and 24 for the larger (but still small by commercial standards) tracks.
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#28 shadow_rusty

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Posted 11 January 2016 - 03:13 PM

Hmmm, according to Policar, it should be a 25t crown, not a 28t one... http://policar.it/AC...I2516-Pl_EN.pdf
Not too sure how I miss counted it that badly, but if that's the case, then the 16t axle will suit me perfectly at ~23mm rollout.

That said, it may be a while before I pull the back end out yet again to recount it.

Edited by shadow_rusty, 17 January 2016 - 11:02 AM.

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#29 shadow_rusty

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Posted 17 January 2016 - 11:02 AM

I recounted the crown gear, and I'm not too sure how I miscounted it twice before.
Fixed the spreadsheet and updated the pic...

View Postshadow_rusty, on 07 January 2016 - 06:33 PM, said:

Mine finally arrive...

I must say, that whilst it looks great, and drives well enough with it's stock motor, I'm kind of disappointed in it.

I must of gotten a Friday / Monday car...
One of the front wings is broken (internally only thankfully)
One of the spacers has a slot in it (C shaped), and only just doesn't fall off of the shaft
One of my front screws was an incorrect type, and jammed into the chassis
3 out of 4 tyres were not fitted to the rim properly, and as such, are now mal-formed


Also, it's definitely going to be a pain to gear these correctly for slower motors.
To work out the gearing, I built this chart Red writing is parts that don't exist yet, and Green writing is the stock parts.
Download File...

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Also, if they had just made the exhaust 'extensions' go towards the front of the car further, the whole thing would be SOOO much easier to disassemble / re-assemble.

Edited by shadow_rusty, 17 January 2016 - 11:03 AM.

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#30 charlesx

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Posted 17 January 2016 - 05:24 PM

Hi all.

Got to try my OTB Lotus 72 today on Bowman Raceway. 18m wood track with smooth 2 pot finish.

Only work undertaken was to adjust tyres to rims better so they ran more or less true. Also rear tyres were lightly sanded to take off any minor imperfections.

Car ran beautifully immediately. Forgot to get some times but it was very quiet and handled well with good brakes, acceleration and top speed compared to Slot-it orange motor powered opposition.

First impressions - far better OTB than any other GP car tried.Only weak point was exhaust extension which came right off. On my Scaly track it kept coming out of main exhaust section mounts. Think this will get discarded for any serious racing. It is possible the grub screw securing it was not tight enough but it is still a weak point with car.

Everybody liked the look of the car. I will now proceed to glue and true the rear tyres and try again.

Regards Chas Le Breton

#31 shadow_rusty

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Posted 16 January 2018 - 01:02 PM

Updated this spreadsheet to an online version...

Policar Gearing / Rollout Calculator
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#32 SlotsNZ

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Posted 16 January 2018 - 02:51 PM

Noice Rusty, Noice, thanks for that
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#33 shadow_rusty

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Posted 17 January 2018 - 12:44 AM

Thanks mate, glad it's of use to others too...
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