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Old 10-16-2014, 07:24 PM   #31
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well the tekin 2650 is ok for 4 cell in 1/8 on road ive been using it for a while...but i have 5600 and 6000 mah batts..however there is quite a bit left in them (for 5min run). Id say yes just use the same combo for a 977 with 15 pinion. and if that OK for run time maybe test 16T.
i dont think youll get 8min unless you drive really conservatively though.
If you use a 2050kV maybe 20-21 pinion. im not sure which of these two motor will work out better so test whatever you have first before buying new stuff.
also check serpent's calculator, it is for download alongside the manual pdf.
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Old 10-16-2014, 11:29 PM   #32
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I will do 'a try with this engine:tppower-4050-2200kv before I try to 4s and subsequently 6s.La question you do and' I can try this engine in 6s? the esc I am going to use and that 'the castle mamba monster.
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Old 10-21-2014, 01:26 AM   #33
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is there anybody having a set-up sheet by default ?
I do nto know which piston to use and which oil ; I set it up using the 3 holes and the OEM oil and the car looks very hard on shocks

running 3S , Tekin RX8 and 1900 Kv engine combo
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Old 10-21-2014, 03:31 AM   #34
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Hard?, with 3 holes and the supplied 600cst oil?
Didn't you maybe overfill the shocks?
I build them with no, or almost no rebound.
Just start with 600cst oil, and 2 holes in the pistons, front and rear.

In my 977 gas car I use 2 holes in the rear with 600 oil, and 2 holes in front with 1000 oil.
In the 977e I put 2 holes in the rear with 600 oil, and 1 hole in front with 500 oil, but haven't driven the car yet, because of the weather.
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Old 10-21-2014, 06:13 PM   #35
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thxs a lot
do not think i was filling that much
will double check this
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Old 10-22-2014, 11:42 AM   #36
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I got 977e only a week ago.. already hooked on the model!

Used some aluminum screws, weight savings about 60g. I am using currently 4S setup, 16/17 or 18/48 gearing with Trackstar 2400 motor on HW SCTpro and 2 x 2S Gens Ace 6500 cells. Top speed with 17 pinion was 105 km/h. With light tires the RTR weight is about 2520g with no fans... see below.

Some photos:




Here with LRP Dynamic 10L 2400 kv , but proved the motor had too little torque and was overheating. This motor was working great in GT car BTW!


Video on Tolmin RC track in Slovenia: http://youtu.be/thQc8PMPHqE
(this was my very first drive with the model)

No fans? I am working on NACA ducting ...


With Sašo - first two models in Slovenia:



One more video from Sašo: https://vimeo.com/109466889
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Old 10-26-2014, 10:13 PM   #37
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I had a chance to test this finally and its very good with 1900kv.
I tested 4000 40c 6S and had plenty a good margin left after 6min.
I used 18T pinion because I didnt get my ordered pinions in time but this was fine.
everything stays cool enough
I have to guess at the top speed...115kmh or more. ill check with radar another time...not that it matters because there no way i need this thing to go any faster. Im so briefly using full throttle on the (62m) straight.
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Old 10-27-2014, 04:18 AM   #38
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Hi guys,
Yesterday finally I managed to run my 977e for the first time.
I did test the prototype, some time ago, but now I have the kit version, which has a few improvements, over the prototype, (nothing related to performance )

For the first time I drove 21 laps in 5.14, which is a record for me, on our track.

After all testing I have done the last year or so with the Tekin stuff I run, I did make a usefull "roll-out chart" for eveybody to use, to give a good starting point for gearing compared to rear tyre diameter.

You can find it on Serpents website in the download section of the 977e.
http://serpent.com/product/904002/downloads/
http://serpent.com/file.php?FileID=6053

The sheet works really simple.
If you run the T8 2050kv motor, you want the car geared between 41-42mm, on a nice open 8th scale track.
On smaller tracks, go down 1 or 2 mm.
For this example, lets take 41mm roll-out.

Start with measuring the tire diameter of your rear tires.
Lets take 73mm for example.
Now check under the 73mm tire diameter, which spur/pinion combination gets closest to 41mm, and put that in your car.
In this case you will end up with 49/15.

If you don't really constantly want to exchange the spur (I don't!) just start running your car with new tires of around 77mm, with the gearing 48/14 then, and once the tires wear down to 72mm, gear up the car to 48/15.

that's it!
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Old 10-27-2014, 05:39 AM   #39
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Quote:
Originally Posted by M7H View Post
Hi guys,
Yesterday finally I managed to run my 977e for the first time.
I did test the prototype, some time ago, but now I have the kit version, which has a few improvements, over the prototype, (nothing related to performance )

For the first time I drove 21 laps in 5.14, which is a record for me, on our track.

After all testing I have done the last year or so with the Tekin stuff I run, I did make a usefull "roll-out chart" for eveybody to use, to give a good starting point for gearing compared to rear tyre diameter.

You can find it on Serpents website in the download section of the 977e.
http://serpent.com/product/904002/downloads/
http://serpent.com/file.php?FileID=6053

The sheet works really simple.
If you run the T8 2050kv motor, you want the car geared between 41-42mm, on a nice open 8th scale track.
On smaller tracks, go down 1 or 2 mm.
For this example, lets take 41mm roll-out.

Start with measuring the tire diameter of your rear tires.
Lets take 73mm for example.
Now check under the 73mm tire diameter, which spur/pinion combination gets closest to 41mm, and put that in your car.
In this case you will end up with 49/15.

If you don't really constantly want to exchange the spur (I don't!) just start running your car with new tires of around 77mm, with the gearing 48/14 then, and once the tires wear down to 72mm, gear up the car to 48/15.

that's it!
Looks like the 2050 setup will be for me now I just need to get the money together!!!
Did you run that on 4 or 6 s??
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Old 10-27-2014, 05:55 AM   #40
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Quote:
Originally Posted by scooby61 View Post
Looks like the 2050 setup will be for me now I just need to get the money together!!!
Did you run that on 4 or 6 s??
6S.

I'm pretty sure, the 1900kv will be even better, because the 2050kv "delta" wounded 4 pole motor, but the 1900kv is a "star" wounded 4 pole motor. And it should have a little less torque, but runs cooler on higher rpm. I did test that motor extensively in my 966e, and know it is fast! but the 2050 does the job also pretty good!

Don't forget, depending on the outside temperatures, I advise you to install fans above the motor!
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Old 11-03-2014, 09:09 AM   #41
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Just got my 977e cant wait to build it so excited!! Im a bit of serpent nut when this came out i was so eager to get one..

been reading the thread and all your input is awesome
im looking for run times not really a speed freak . want to run longer run times..
Have you guys tested 4S vs 6S run times?
What gearing do you use?
Insight on weight and handling 4S vs 6s?

thanks guys and i hope this following catches on

Im thinking of making use 7200mah 2S packs
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Last edited by BIBOY; 11-03-2014 at 10:23 AM.
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Old 11-03-2014, 06:21 PM   #42
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6S 4500 and 1500kv and 18-19T pin or something..

with those 7200s its slightly more watt-hours but wont be quite as good run time due to lower voltage. but maybe 2200-2400KV with those...same pinions

handling the same? because the packs weigh the same. around 320g each.
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Old 11-04-2014, 05:27 AM   #43
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Default motor and esc choice for 4s

I am still undecided as to whether to go for 4s or 6s, but because the track that I frequent has a straight of about 150ft so guys who run there said 6s would be way too fast, so I am leaning towards 4s. Has anyone tried the Toro TS 150A with 4s? How about the LRP ix8?

Was thinking of using that with a speed passion blaze motor, which KV should I get? 2450 or 2750 kv? And how many tooth pinion should I start with? Then, is there any setup that could work for botb 4s and 6s? Cause I might bring it to another bigger track sometime.

Any advice appreciated. Thanks
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Old 11-04-2014, 05:50 AM   #44
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A 2650kv motor on 4s, is just as fast as a 2000kv motor on 6s, so if you are looking for a set which you can use on 4s but also on 6s, go for a 2000kv motor max!, and gear up that pinion on 4s, until you reach the speed you want!

i did test my 966e with 4S lipo => https://www.youtube.com/watch?v=uwOzil59Mvg

check the description for set-up details.

To give you an answer on what pinion you should start with.

Lets take a 1800kv speed passion blaze motor.
If you want to gear the car to reach 85kmh, this is how you need to gear it.
1800kv x 3.7V x 4S = 26.640 rpm (theoretically)
check gearchart.com an fill in the figures you know and to find out the gearing you need to accomplish this.
- internal ratio = 1.714 (28/18)
- rpm = 26.640
- tire diameter = 73mm
And start playing with the spur (48 / 49 / 50) and pinion (14 => 21), until you have the desired speed, then check what roll-out goes with this speed.
If you fill in everything correctly, you will come to a roll-out of around 53,5mm and a spur / pinion of 50 / 20.


The "roll-out" chart you can also download from serpents website on the 977e page.

If I'm correct, a 21 pinion is the max pinion that fits the car.
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Last edited by M7H; 11-04-2014 at 06:47 AM.
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Old 11-04-2014, 06:20 AM   #45
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ive used the IX8 a lot on 4s, it is really cool and its a little softer power, easy to drive consistent.
but at the moment im using a turnigy 150A genII with 6S.
I have the blaze motor too, (1800kv)...looks good....havnt run it yet. be sure to get the sensored version to run with iX8.
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