Rooster tail carbs

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
John Parks said:
All around, I mean its not an OMG difference but I noticed increase in throttle response, it seemed faster also but I don't run a gps to verify. There are a few videos of someone comparing them and the speed is greater.
Click to expand...
Got you. I have the rt990 on my mcd xr5 with the rt efra modified 26 but I've never put anything else on it so can't compare.
 
Roostertails used to be the go to carbs for drag racing.
Yes they provided more power when used for drag racing.
They aren't really basher carbs,just designed four max fuel flow.
Many racers have used them and I'm sure some still do,but most have moved to newer/ modded carbs. Get the right tool for the job.?
 
As I read this thread and try to follow along, I don't know very much about carbs nor am I a good tuner but have been taught 2 different outlooks on tuning the low end. Makes me wonder what is right when these carb threads come up, one guys tune may not be the same as another's so how can we judge carbs unless pushing the motor to the limit?
 
Testing testing and more testing,there's no shortcut for gaining experience. Theres also more to tuning then individual parts,you have to look at it as a system. Carbs are one aspect but where do you go when the carbs set correctly but your vehicle isn't behaving like you want?. You have figure out how you would like the vehicle to behave,once you figure that out - you can begin to be a tuner. Take notes as you try different settings so you have data to fall back on if/when you get totally lost.
Vehicle weight,clutch,tire size etc all come into play when tuning. Grab your tools and make small incremental adjustments, you'll start to put it together after some trial and error and remember what works for one vehicle might be totally different for another regardless of brand.???
 
Milo said:
There’s too much snake oil out there. I need real world experiences like in my other carb thread. If I believed the first thing I’d heard, Tillotson are supposed to be the best but the experienced people on here that have used them say otherwise.

If they were that good then everyone would have them.

I’m just looking to eek out every last drop from what I have.
Click to expand...
I got 3 of them i put 1 on my obr 34ss and its a noticeable improvement over the 1107,990,and the new carb obr sells i think its a 1224 or a 1242. Thats why i got the 2nd and 3rd. Just in case?
Roostertail full mod 990
 
I just don't understand how one can compare. It's not like changing up a pipe. Carb settings will be the same then swap up pipes to tell the difference. What if when you put the new carb on you happened to tune it better this time around? Only takes a 1/16 adjustment to make it perform better or worst??‍♂️
 
Last edited:
crucialRC said:
I just don't understand how one can compare. It's not like changing up a pipe. Carb settings will be the same then swap up pipes to tell the difference. What if when you put the new carb on you happened to tune it better this time around. Only takes a 1/16 adjustment to make it perform better??‍♂️
Click to expand...
Carb tuning is very subjective. Between the person tuning it, environmental factors, and engine set up. What one may see as a huge improvement another may not see as such. Weather it's a percieved change or an actual change is tough to call when your makeing small changes within a std carb structure. Same as my thought going to the spiral diaphram. I'm certain that throttle response was better, but have no way to quantify that besides my experience with that carb before. I did have to tune a bit differently for that diaphragm, was my tune a bit better? Idk. Fact is there are enough guys that like the carbs performance and think it's done better then the factory carb to say it's a decent carb.
 
The biggest issue with tuning for added RC performance is the fact most of the typical RC 'enthusiasts" are test tuning based upon only ONE factor, and that's "i'm OBSERVING better /faster/more performance" . Generally nobody actually puts there RC through a specific systematic documented type of testing. How do you REALLY know you gained any performance by bolting on your "##### ####" performance part from just general bashing ? I went through SO many ugly arguments with arrogant punks over at RCU trying to drive my point but always got slammed. With RC's you have no physical feel of power delivery as you do with typical cars/ trucks/ motorcycles / whatever. Your only going by observations , which no matter what will be inconsistent based upon terrain conditions. When I was testing tunes and pipes and gearing with my nitro Savage back years ago I set up a standard asphault drag strip about 400' long marked with cones and affixed a simple timer right to my Tx . It worked excellent. At least with this I had a repeatable consistent data method of testing power and the "holy grail" of RC bragging the "top speeds" .
 
Back
Top