GRP .21 Carb Restrictor ?
02-26-2009, 07:51 AM
#1
GRP .21 Carb Restrictor ?
I am running a GRP .21 Silver top all stock.. My mill has plenty of power I was wondering how much run time I would stand to gain by changing the size of the carb restrictor. I would really like to hear from some people that have played around with some different sizes.
I just looked at mine and it came with a 7.0. Do I have to use a GRP?
Right now with a race tune on the richer side I am getting about 7 mins run time with a JP3 pipe
I just looked at mine and it came with a 7.0. Do I have to use a GRP?
Right now with a race tune on the richer side I am getting about 7 mins run time with a JP3 pipe
02-26-2009, 07:58 AM
#2
I am running a GRP .21 Silver top all stock.. My mill has plenty of power I was wondering how much run time I would stand to gain by changing the size of the carb restrictor. I would really like to hear from some people that have played around with some different sizes.
To be honest I am not even sure what size my motor came with I dont see it any where in the manual.
Right now with a race tune on the richer side I am getting about 7 mins run time with a JP3 pipe
To be honest I am not even sure what size my motor came with I dont see it any where in the manual.
Right now with a race tune on the richer side I am getting about 7 mins run time with a JP3 pipe
02-26-2009, 08:10 AM
#3
It comes with a 7mm stock. I have been using the 8mm in a .21 tuned and averaging 10-11 min per tank in a truggy. I also have a powerhouse modded GRP .21 with the 8mm insert and that engine was averaging 11.5 min per tank in a 8T 2.0. How much fuel has been through the motor. It sounds like it is not broken in all the way yet. These engines take awhile to break in.
02-26-2009, 01:14 PM
#5
I'll go ahead and tell ya; on the JP3 you're not going to see mega-mileage.
Look into the GRP 2053 or even a Nova 9853 or 9901 and see if you don't pick up a little.
The one guy in my area that runs a GRP uses a 6mm restrictor (on a buggy). Fine for most tracks, but runs out on the top end of bigger tracks.
Look into the GRP 2053 or even a Nova 9853 or 9901 and see if you don't pick up a little.
The one guy in my area that runs a GRP uses a 6mm restrictor (on a buggy). Fine for most tracks, but runs out on the top end of bigger tracks.
02-26-2009, 01:20 PM
#6
I'll go ahead and tell ya; on the JP3 you're not going to see mega-mileage.
Look into the GRP 2053 or even a Nova 9853 or 9901 and see if you don't pick up a little.
The one guy in my area that runs a GRP uses a 6mm restrictor (on a buggy). Fine for most tracks, but runs out on the top end of bigger tracks.
Look into the GRP 2053 or even a Nova 9853 or 9901 and see if you don't pick up a little.
The one guy in my area that runs a GRP uses a 6mm restrictor (on a buggy). Fine for most tracks, but runs out on the top end of bigger tracks.
02-26-2009, 02:43 PM
#7
Use a dynamite 053 with the 7mm insert and you should be getting around 8:30 to 9 minutes in race tune. By the way it's a sweet little engine you'll be glad you bought it. jp3 is killing the mileage!
02-26-2009, 03:21 PM
#8
pipe and restrictor
So what you guys are saying is a smaller restrictor alone is not going to make any sort of noticeable difference. But switching the pipe and the restrictor will make a small diff maybe an extra 1min or 1.30 min run time
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