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Old 03-02-2009, 08:13 AM   #16
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The 8mm is still pretty wide open. At 7mm is where it really starts to tame it down. The best set-up I found to smooth out the V-Spec was a IRDC 7mm venturi and the EB mods pipe.

I use a JX Ninja 7mm restrictor and 2060 pipe in my buggy and can do 10 minute pit stops no problem now.
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Old 03-02-2009, 08:22 AM   #17
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where can I get a 7MM venturi that fite the V-Spec with 21J carb.. in the UK???
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Old 03-02-2009, 08:36 AM   #18
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http://www.amainhobbies.com/product_...oducts_id/7116

I dont know where to get one in the UK as I am in the USA but this is the one I am talking about using in the V-Spec. Unfortunately when I sold the V-Spec I forgot to remove it.

The one I use in my Ninja is the 7mm one that comes with the Speed engine. Its a red aluminum one. The new version of the JX Ninja the BO1A comes with the same 7mm aluminum one but its the gray Mugen color instead of red.
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Old 03-02-2009, 08:41 AM   #19
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Well, last season was my first in nitro off-road. I spent most of the time I should be driving, working on my car.


Then I switched to Xray!
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Old 03-02-2009, 08:43 AM   #20
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Can someone explain exactly what a restrictor does? Also do you guys think I should have one in my grp not-tuned buggy engine? I am a beginner and never have raced 1/8 yet so all help would be great.
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Old 03-02-2009, 08:44 AM   #21
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It limits the amount of air entering the engine and slows it down and increases mileage.
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Old 03-02-2009, 08:46 AM   #22
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So do you think, the Venturi's that fit the Ninja will fit the 21J carb??
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Old 03-02-2009, 08:48 AM   #23
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ok so I think I would like to have one around just in case sowhat size is sort of a good starting point? 7mm
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Old 03-02-2009, 08:52 AM   #24
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Yes I think all the OS carbs use the same size.

The RB and Novarossi inserts are the same too as the first time I tried a 7mm it was a orange plastic RB insert.
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Old 03-02-2009, 09:01 AM   #25
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I dont know a whole lot about the GRP engines as I have never owned one. I think guys using the orange head version told me a 6mm insert worked best. I just checked and GRP offers them anywhere from 5-9mm by 0.5mm.

I would check with others who run that engine though. I have been pretty much strictly OS engines for the last 3 years but will be switching to the Reedy engine when it comes out this spring.
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Old 03-02-2009, 09:10 AM   #26
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got me thinkin....... my os carb is crap and im using a grp carb on my speed, i wonder if the speed inserts fit the grp carb.......
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Old 03-02-2009, 09:14 AM   #27
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What happened to your Speed carb?

I'm looking forward to coming down there next weekend for the first race in the series at RC Pro.
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Old 03-02-2009, 09:18 AM   #28
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Is there, any difference between the Jammin Hard Coated pipes and the Polished pipes.. apart from the looks.. is one stronger than the other?? ect.
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Old 03-02-2009, 09:21 AM   #29
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Yes a hard coating is a little stronger but when your talking JP pipes they are all very strong so its not a big advantage.
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Old 03-02-2009, 09:22 AM   #30
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Yea, Im getting a JP-4 soon and was wondering if there were any diffrences apart from the obvious=Looks.. ok kl..
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