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Old 08-20-2008, 11:06 PM   #1
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Default Carb Restrictor

Who here races with a carb restrictor on their intake.

I"ve done a bit of reading and a few searches and found that they slow down the engine thats already overpowered, and increase run time. Also to richen out the needles if removing it from the carb.

What are peoples opinions here in regards to these.

Do you use one?

What benefits do you think there is to taking it off or leaving it on.
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Old 08-21-2008, 07:29 AM   #2
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I know that engines from Sirio, novarossi and OS use carb restrictors. They all use a carb restrictor at all times and can be easily swapped out as a tuning option. A smaller restrictor opening will decrease your top speed and may affect the bottom end slightly or maybe not at all. You will however gain runtime.
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Old 08-21-2008, 07:44 AM   #3
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I often run them in on road for more run time (8.5mm or 8mm).

Since all the off road tracks around here are small and tight I see no reason not to use at least an 8mm and usually a 7mm. If you can't use all that power you might as well get better mileage.

I have on occasion seen motors that were very difficult to get tuned right on the bottom end and dropping to a smaller venturi cleared out the problem and made them much more tune friendly.
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Old 08-21-2008, 10:11 AM   #4
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Default venturi

I have a .28 in my truggy and the insane power hurt my lap times. I went to a 6.5 and now a 6mm venturi. I can still clear the biggest jump on the track and have now gained almost 2 minutes run time.
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Old 08-21-2008, 11:11 AM   #5
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If you wanna seriously increase your runtimes but don't want to loose much...if any noticable power....I strongly recommend IDRC carb inserts. If your racing....they are a must have item. I run a 6mm in a Go tech 5P and can pull a 10min run pretty easy.
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Old 08-21-2008, 12:50 PM   #6
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I am sure the 15 inches of fuel line help also......
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Old 08-21-2008, 12:59 PM   #7
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Brian are you picking on the short "gifted" people
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Old 08-21-2008, 01:22 PM   #8
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Quote:
Originally Posted by brian kadow View Post
I am sure the 15 inches of fuel line help also......


It's legal.....I promise.




I just got off the phone with your boss......
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Old 08-21-2008, 02:22 PM   #9
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Hello all,

The IDRC Velocity Venturi's were designed with the racer in mind. They will improve overall performance and mileage of the engine without killing the top end power.
You can run a 6 or 7mm IDRC venturi and increase low to mid response and still acheive the same top end power that you would with a stock OEM 8mm venturi.
The power the engine produces will be smoother through the entire powerband and fuel mileage will increase due to a broader powerband.

These venturi's work very well and are unlike any other on the market.
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Old 08-21-2008, 02:36 PM   #10
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Quote:
Originally Posted by Ralph Walters View Post
Hello all,

The IDRC Velocity Venturi's were designed with the racer in mind. They will improve overall performance and mileage of the engine without killing the top end power.
You can run a 6 or 7mm IDRC venturi and increase low to mid response and still acheive the same top end power that you would with a stock OEM 8mm venturi.
The power the engine produces will be smoother through the entire powerband and fuel mileage will increase due to a broader powerband.

These venturi's work very well and are unlike any other on the market.


Uhhh....ya. They are the best!
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Old 08-26-2008, 09:45 PM   #11
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i run a 6.5 mm carb restrictor in my nov 821b on my x2 and it has plenty of power.
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Old 09-28-2008, 02:25 AM   #12
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I am looking for 5.5 or 6 carb restrictor for the OS Speed or are they any which fit the OS?
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Old 09-28-2008, 09:33 AM   #13
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yup. I run an OS 5.5mm in my jx .21. It is an actual OS part. Machined metal and not plastic. Really tames this motor. Can't remember the part #.
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Old 09-28-2008, 09:39 AM   #14
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where can i purchase carb restrictors?
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Old 09-28-2008, 09:51 AM   #15
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Ralph Walters @ IDRC


rwalters163@msn.com,
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