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Serpent Spyder SRX-2 Mid Motor Buggy Thread

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Serpent Spyder SRX-2 Mid Motor Buggy Thread

Old 12-03-2015, 03:17 AM
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Old 12-03-2015, 05:09 AM
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Originally Posted by shagino View Post
Not sure if it'll physically fit.
I got a 31 pinion on with the 76 spur last night. Just barely fits. My track is a little on the smaller side so that spur should be good.
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Old 12-03-2015, 06:05 AM
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Originally Posted by Slapjack View Post
I got a 31 pinion on with the 76 spur last night. Just barely fits. My track is a little on the smaller side so that spur should be good.
Monitor your temps. I'd try both.
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Old 12-03-2015, 12:02 PM
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I will have to pickup a temp gun at home depot or something for tomorrows race. I have never used one before on my cars. But I think that gear ratio is pretty safe. The booklet that came with the motor said 5.5-6.5 for buggy and 76/31 is is 5.95 FDR so I am hoping it works ok.
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Old 12-03-2015, 01:07 PM
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Originally Posted by Slapjack View Post
I thought the same thing last night when I bolted up the motor. The shaft is pretty close to the spur. But it was on there so whoever had this before ran it somehow. I will probably just switch to the 70T. I have a 26T, 31 and 33T pinion coming so those will work still even with the 70T pinion. That will be a 5.15, 5.48 & 6.5 FDR.

How do I determine what the FDR should be for different motors? I also have a 6.5T LRP motor I may try running, but not sure what that FDR should be.
On a 7.5 motor you want to be running a 20-22t pinion, if you are using a lower wind than that you'll need under a 20 for sure. I wouldnt go lower than a 7.5 unless you are racing on carpet or a really big track
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Old 12-04-2015, 08:14 AM
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Originally Posted by rxmeador View Post
On a 7.5 motor you want to be running a 20-22t pinion, if you are using a lower wind than that you'll need under a 20 for sure. I wouldnt go lower than a 7.5 unless you are racing on carpet or a really big track
I am starting out with a 17.5T on a smaller size clay track. I used a 6.5T in my xray 4wd and it was way too much at that track so I stuck an 8.5T in that. So all I have right now is the 6.5T and a 17.5T so I figured I would start with the 17.5T. My FDR is 5.95 with 76/31
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Old 12-05-2015, 05:29 AM
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Originally Posted by Slapjack View Post
I am starting out with a 17.5T on a smaller size clay track. I used a 6.5T in my xray 4wd and it was way too much at that track so I stuck an 8.5T in that. So all I have right now is the 6.5T and a 17.5T so I figured I would start with the 17.5T. My FDR is 5.95 with 76/31
If you boost that 17.5T with the right gearing, you'll be surprised how fast it is. Not sure what kind of Speedo your running, but put about 25 degrees of timing in at least. Also run some turbo timing too. Of course you can't do that if you are running in stock class.
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Old 12-05-2015, 05:33 AM
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Originally Posted by jfjohnson View Post
If you boost that 17.5T with the right gearing, you'll be surprised how fast it is. Not sure what kind of Speedo your running, but put about 25 degrees of timing in at least. Also run some turbo timing too. Of course you can't do that if you are running in stock class.
If you are unsure about gearing, start conservative and work your way toward a lower drive ratio. Temp your motor after about 2 - 3 minutes to see where it is at. Don't be afraid to run that 17.5t at 180 after a full heat. That's when you'll know you are getting the most out of it.
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Old 12-07-2015, 03:00 PM
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Hello everyone,

Is anyone running their MM without a slipper for 17.5 stock class? My buggy weighs about 1560 if I use battery with 210grams but I do have a battery that weighs 150grams but not as powerful and it would put it right at 1500grams or so. Anyone tried these two setups? Help!! thank you.
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Old 12-08-2015, 12:10 PM
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Originally Posted by Glen H View Post
Hello everyone,

Is anyone running their MM without a slipper for 17.5 stock class? My buggy weighs about 1560 if I use battery with 210grams but I do have a battery that weighs 150grams but not as powerful and it would put it right at 1500grams or so. Anyone tried these two setups? Help!! thank you.
Maybe ask here...

https://www.facebook.com/groups/SerpentSpyder/


The FB group is much more active on a daily basis than here on Rctech. I don't even visit this site much anymore unless I'm selling something.
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Old 12-11-2015, 10:27 AM
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Originally Posted by jfjohnson View Post
If you are unsure about gearing, start conservative and work your way toward a lower drive ratio. Temp your motor after about 2 - 3 minutes to see where it is at. Don't be afraid to run that 17.5t at 180 after a full heat. That's when you'll know you are getting the most out of it.
Hey I just saw this post. I haven't checked back here in a bit. I was wondering about the motor timing and esc timing. I don't really understand that stuff completely yet but where do you think I should start. The 17.5 Trinity ss motor came set to about 50 deg timing I believe. I am running an Orca VX3 esc... what timing should I put on that? There is no class really at my track other than 2WD buggy, 4wd buggy, etc... No motor restrictions, just run whatever you want for electronics.
I also wanted to ask... If I wanted to swap out the ball studs for ones with a hex head so I can use a hex driver instead of a nut driver what should I buy (size wise, I was thinking Lunsford or at least something titanium)? Also had the same question about the turnbuckles. I have a bent front turnbuckle, which titanium turnbuckle should I get (which sizes)?
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Old 12-11-2015, 11:28 AM
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Originally Posted by Glen H View Post
Hello everyone,

Is anyone running their MM without a slipper for 17.5 stock class? My buggy weighs about 1560 if I use battery with 210grams but I do have a battery that weighs 150grams but not as powerful and it would put it right at 1500grams or so. Anyone tried these two setups? Help!! thank you.
Yeah, I'm running it with the RC Shox slipper eliminator. I've also used the Exotek one.

I can't understand the second part of what you are asking. I had my buggy at like 1500 but I'm not sure what it weighs now as I've stopped being overly concerned with weight. Maybe 1530 or so.
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Old 12-14-2015, 02:09 PM
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I wonder when that 3 gear and carbon/alu chassis coming out.
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Old 12-16-2015, 05:47 PM
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Having a problem with steering throw... I get more steering to the right then the left. When I hooked the servo up I turned it on the installed the horn. I noticed I didn't have much steering at the track but it was my frat time with 2wd and I just figured it was the buggy. But after looking at it on the bench I can tell the throw is much more to the right than the left. I set everything to 100% on my tx what else should I check?
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Old 12-16-2015, 07:28 PM
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Disregard my previous post.... I figured it out. The previous owner had the steering linkage arms all messed up. The lengths were off by 2mm's. I have to learn to check those off the bat when buying used. Seems like atleast a couple linkages are off with every used car I buy.
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