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Old 12-08-2008, 10:40 PM   #1
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Default GRP .21 VS Ninja jx21

I sure this has been asked over and over but my brother was wondering which of these two engines get the bets fuel mileage, as well as which one is easier to tune for a novice - intermediate user, and which one has more power?
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Old 12-08-2008, 11:07 PM   #2
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Frim what I have seen/heard the os based motors(JX21 ninja) are easier to tune and get better runtime than the grp based motors. As for power i can't comment on that. From what I have seen at the track the grp motors are pretty finnickey to tune. My os motors on the other hand are probably the easiest tuning motors I have had. Plus they get 10+ minutes in runtime.
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Old 12-08-2008, 11:39 PM   #3
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i dunno about the grp's but that ninja is quite fast..a guy had one in his losi at rev yesterday it was beyond fast..I
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Old 12-09-2008, 06:04 AM   #4
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both engines are good, i havent been running the ninja jx very long, but i got better fuel economy with the grp, they both have good power, the ninja is punchier on the bottom, but the grp isnt far behind with the right pipe, i found the novarossi 9853 and the ttr2035 to be better then the grp pipe, it really woke the engine up
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Old 12-09-2008, 06:16 AM   #5
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GRP is not difficult to tune, its just unconventional. You typically tune the LSN first. Run times are excellent. Downside, if it's for a Truggy the bottom end is just not there with the GRP.
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Old 12-09-2008, 06:33 AM   #6
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i ran the grp in my truggy and it worked out good, i used p3 plug and 6.5 restrictor and 2035 pipe, had plenty of power everywhere
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Old 12-09-2008, 06:52 AM   #7
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Yeah I had plenty of power everywhere; except the bottom end. I must of had a lemmon, see my post in the GRP thread
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Old 12-09-2008, 07:03 AM   #8
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the jx definatley has some bottom nutt, similar to v-spec and speed
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Old 12-09-2008, 07:47 AM   #9
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Yeah, I ran a v-spec in my truggy after the GRP took a crap, man what a difference, totally woke it up. Now, for buggy, I think I might rather have the opposite.
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Old 12-09-2008, 08:05 AM   #10
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yea the speed would be a little better in the buggy with a 2060, its smoother but still has the punch when you want it, i just started running the jx w/2060 in my mp9 its pretty sick
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Old 12-09-2008, 11:30 AM   #11
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For runtimes and ease of tuning, hands down its the JX21. Raced last Saturday and after each 5min qualifying came in at half tank of full left. Was coming in for pit in the 25min Amain at the 9min interval with no problems.
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Old 12-09-2008, 02:17 PM   #12
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for a buggy I feel the GRP is the better engine. It gets better runtime period over the jx. It may not be what some want in a truggy but it's perfect for buggy and lays the power to the ground!

Thats not to say the jx is a bad engine because it's one of the better ones out now

http://www.carolinasrc.com/webstore/...idproduct=8834

http://www.carolinasrc.com/webstore/...idproduct=9820

Pricing is a little more now on the GRP. If tuned out to get runtime the jx is a handful for most average guys in a buggy.

However the GRP when tuned out runs about 190 goes easily 9-10 minutes and is a smooth fast engine with a decieving bottom end
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Old 12-09-2008, 05:18 PM   #13
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I run both of these engines. The grp on my 8 2.0 gets around 9:30 on average. The jx on my 8t gets about the same. The grp is perfect for buggy plenty enough power and holds a tune well. The jx also holds a tune very well and can throw a truggy around with no problem.
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Old 12-09-2008, 06:00 PM   #14
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grp, for me ran both engines and i would rather have a grp.
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