3LikesSpeed Run Electric (All Classes Welcomed)
05-24-2016, 09:30 AM
#241
My car runs the same diff gears as the GTP2e, 44/14 (3.14/1), which is one of the reasons I chose this kit. The MGT7 runs a 42/12 (3.5/1), or the "overdrive" gear set 44/13 (3.38/1). So, all things being equal, the GTP2e will go faster.
In my opinion, it's all about managing friction, which is another area the OFNA has an advantage. Having the ability to dial out almost all the rear toe-in, is a big advantage. You need a little toe-in to compensate for tire drag and add stability, but not the amount most cars come with come with.
What do you think?
05-24-2016, 12:03 PM
#242
Tech Addict
Ok, I got a couple of questions for you. I don't want you to give away all your secrets, but when you made your 7s149mph run, what was your theoretical top speed? By that I mean, how fast was it supposed to go on paper. I'd like to see what type of drag/friction loss you experienced. Second, what body are you running?
My car runs the same diff gears as the GTP2e, 44/14 (3.14/1), which is one of the reasons I chose this kit. The MGT7 runs a 42/12 (3.5/1), or the "overdrive" gear set 44/13 (3.38/1). So, all things being equal, the GTP2e will go faster.
In my opinion, it's all about managing friction, which is another area the OFNA has an advantage. Having the ability to dial out almost all the rear toe-in, is a big advantage. You need a little toe-in to compensate for tire drag and add stability, but not the amount most cars come with come with.
What do you think?
My car runs the same diff gears as the GTP2e, 44/14 (3.14/1), which is one of the reasons I chose this kit. The MGT7 runs a 42/12 (3.5/1), or the "overdrive" gear set 44/13 (3.38/1). So, all things being equal, the GTP2e will go faster.
In my opinion, it's all about managing friction, which is another area the OFNA has an advantage. Having the ability to dial out almost all the rear toe-in, is a big advantage. You need a little toe-in to compensate for tire drag and add stability, but not the amount most cars come with come with.
What do you think?
To me, the internal diff ratio of a car is not that big of a deal when you can just gear up the pinion or gear down the spur to compensate. My Mugen MGT7's high 3.38 internal diff ratio has never held me back.
Check out some of my speed runs:
https://www.youtube.com/channel/UCLg...zCRTPqUsSUrdPg
05-24-2016, 01:19 PM
#243
I dont use speed calculators because they seem to usually be very innacurate. I believe my mugen went 137 on 6s that day and 149 on 7s. I run Ipanema Warrior bodies.
To me, the internal diff ratio of a car is not that big of a deal when you can just gear up the pinion or gear down the spur to compensate. My Mugen MGT7's high 3.38 internal diff ratio has never held me back.
Check out some of my speed runs:
https://www.youtube.com/channel/UCLg...zCRTPqUsSUrdPg
To me, the internal diff ratio of a car is not that big of a deal when you can just gear up the pinion or gear down the spur to compensate. My Mugen MGT7's high 3.38 internal diff ratio has never held me back.
Check out some of my speed runs:
https://www.youtube.com/channel/UCLg...zCRTPqUsSUrdPg
While it is true that you can match the final drive ratio by changing the pinion/spur ratio, there is a small problem with that. For example, all things being equal, the Mugen would need to be geared at 41/40 (pinion/spur) to match the final drive ratio of the OFNA at 38/40 (pinion/spur). This gives the OFNA a much greater mechanical advantage at the motor that is not lost at the diff.
Just food for thought.
I like your videos. That's super fast on city streets though.
05-24-2016, 01:59 PM
#244
Tech Addict
I agree that the gearing/speed calculators are inaccurate, but thats because they don't account for things like drivetrain friction or aero drag. But, if you know this they can be useful.
While it is true that you can match the final drive ratio by changing the pinion/spur ratio, there is a small problem with that. For example, all things being equal, the Mugen would need to be geared at 41/40 (pinion/spur) to match the final drive ratio of the OFNA at 38/40 (pinion/spur). This gives the OFNA a much greater mechanical advantage at the motor that is not lost at the diff.
Just food for thought.
I like your videos. That's super fast on city streets though.
While it is true that you can match the final drive ratio by changing the pinion/spur ratio, there is a small problem with that. For example, all things being equal, the Mugen would need to be geared at 41/40 (pinion/spur) to match the final drive ratio of the OFNA at 38/40 (pinion/spur). This gives the OFNA a much greater mechanical advantage at the motor that is not lost at the diff.
Just food for thought.
I like your videos. That's super fast on city streets though.
05-25-2016, 03:10 PM
#245
I have to say if you the right numbers in the speed calculator you can get it pretty close. Pete has a couple fast cars. I also agree that internal diff ratio don't matter..
05-25-2016, 06:11 PM
#246
Yeah, the diff ratios don't make a HUGE difference, but there is a mechanical advantage there that results in a little more power at the wheels.
Looks like there is a ROSSA event planned for September just North of LA. Can't wait for that.
05-26-2016, 01:24 AM
#247
Tech Addict
I like the speed calculators. When combined with the info from a data logger, it makes tuning much easier. I wish Castle would fix the new XLX. Their data logger is pretty awesome.
Yeah, the diff ratios don't make a HUGE difference, but there is a mechanical advantage there that results in a little more power at the wheels.
Looks like there is a ROSSA event planned for September just North of LA. Can't wait for that.
Yeah, the diff ratios don't make a HUGE difference, but there is a mechanical advantage there that results in a little more power at the wheels.
Looks like there is a ROSSA event planned for September just North of LA. Can't wait for that.
05-26-2016, 09:37 PM
#248
05-27-2016, 08:01 PM
#249
Tech Addict
05-31-2016, 07:07 PM
#250
Tech Addict
World's Fastest Kyosho
06-02-2016, 08:43 AM
#251
Tech Rookie
pretty sure they have a 42t ring gear as option. to the fella looking into diff ratios.
06-02-2016, 08:46 AM
#252
Tech Rookie
Has anyone noticed a motor temp change from switching over to a spool on the MGT7?
I'm geared pretty low maybe 90ish right now and the motor likes to spike up fast... I have my spool coming and was hoping that would relieve a little heat.
I've gone through and checked everything and there were no binding issues building the kit.
I'm geared pretty low maybe 90ish right now and the motor likes to spike up fast... I have my spool coming and was hoping that would relieve a little heat.
I've gone through and checked everything and there were no binding issues building the kit.
06-02-2016, 09:26 AM
#253
Tech Addict
Has anyone noticed a motor temp change from switching over to a spool on the MGT7?
I'm geared pretty low maybe 90ish right now and the motor likes to spike up fast... I have my spool coming and was hoping that would relieve a little heat.
I've gone through and checked everything and there were no binding issues building the kit.
I'm geared pretty low maybe 90ish right now and the motor likes to spike up fast... I have my spool coming and was hoping that would relieve a little heat.
I've gone through and checked everything and there were no binding issues building the kit.
06-02-2016, 09:29 AM
#254
Tech Addict
Mugen says the 42t diff ring gear must be used with their 12t diff pinion which makes the diff ratio even higher (from 3.38 to 3.5) If the 42t ring gear can be used with the stock 13t ring gear it brings the diff ratio down to 3.23. Stock ring gear is 43t btw.
Last edited by tc4basher; 06-02-2016 at 11:11 AM.
06-02-2016, 09:47 AM
#255
Tech Rookie
Yeah main reason is to use a taller ratio. I figured the center would cause restriction on take off and heat things up.