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Old 04-26-2005, 10:48 AM   #7921
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Rody,

I feel your pain. I ran a NTC3 last season, and that S bend isnt the optimal design. If you have extra manifold (in case it doesnt work for you), try cutting 10mm off the manifold. This should help out greatly on the top 1/4 of the power band.

Also if possible converting to a centax clutch is huge. These two mods will wake up that Rody!!


John
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Old 04-26-2005, 03:57 PM   #7922
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will i lose bottom end by cutting the manifold? Im using a Traxxas clutch at the moment with a 2mm drill hole in each shoe! It feels like my old centax.
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Old 04-26-2005, 04:57 PM   #7923
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Originally posted by Rody
Hey guys, i race an RB V12 Turbo powered NTC3 in Australia and im using an OFNA pipe! My car just seems to hit a brick wall at 3/4 of the rev range! I have tried different gearing and the problem is still there! The general opinion here seem to be that the RB does not like so many 'S bends' in the pipe, and also the length of the pipe. Unfortunately in Australia, there are barely any NTC3's racing so i cant really compare with other racers at the track. If anyone is running an RB V12 in a NTC3, what pipe are you using and how do you find it! Thanks (p.s. tune is good and running trinity 16% nitro)
I`ve raced my Factory Team NTC3 at both Moorebank and Eastern Creek tracks here in Sydney and was very pleased with the way the RB V12 (non-turbo) performed with the FT dual chamber pipe......VERY good low to mid range power and the top end was good as well.
That engine now resides in my RRR with a RB manifold and RB V-Concept 401 pipe......the only real difference thats noticeable over the pipe/manifold in the FT NTC3, is that theres just a fraction more torque on the bottom end with the RB pipe setup.....top-end is virtually the same.
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Old 04-26-2005, 05:01 PM   #7924
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Quote:
Originally posted by Rody
I have tried different gearing and the problem is still there! )
How large a tyre diameter have you been using Rody?
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Old 04-26-2005, 06:19 PM   #7925
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Rody: Cut the pipe like said here and try, I think 10mm is'nt enough but try that first, if that helps go 13mm in 1mm intervals to make sure 13 is not too much. I'd try the factory dual chamber instead of the ofna if you have it or buy it. It's the cheapest thing next. If money is'nt a problem get the RD lodgics pipe (Turbo pipe), or better yet try the WERKS RACING I really like the WERKS pipe. I've always prefered the RD pipe and the WERKS pipe.
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Old 04-26-2005, 11:55 PM   #7926
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i am running a jp fx3 with "the winners choice" pipe (US$37.90 from rcmart). it has ballistic bottom end and only slightly slower top end then the hoards of mugens at my local track. i am using 21/27 pinions and 48/54 spur gears.
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Old 04-27-2005, 12:00 AM   #7927
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Hi Rody,
I run RB Engines in my NTC3 (V12 and V12 Rody) and I find the RD Logics pipe quite good for delivering top end power, due to it's smaller volume. The Factory Team dual chamber pipe is also an excellent choice.
Hope this helps.
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Old 04-27-2005, 01:28 AM   #7928
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Thanks for all the help and feedback guys. I'm going to try the the RD logics pipe setup! P.S. Andy T, i was running out of legs 3/4 of the way down the straight at Moorebank with standard gearing!!!
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Old 04-27-2005, 04:49 AM   #7929
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Here you go Striker. Centax view.
Attached Images
File Type: jpg centax.jpg (150.8 KB, 150 views)
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Old 04-27-2005, 05:03 AM   #7930
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Rody,
Moorebank will certainly test a car out for gearing......i ran the stock FT gearing there 54/48 , 21/27 and it wasnt too bad at all down the straight as long as tyre diameter wasnt too small.
A friend of mine is running a FT NTC3 with a mod .12 in it at Eastern Creek... running the FT pipe this car makes some serious low end torque but the straight there just isnt long enough to see how the cars top end is....hopefully he can get it down to Moorebank one day
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Old 04-27-2005, 05:37 AM   #7931
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I just went to Joe's (RB distributor) house and picked up an RD logics pipe! Hopefully this does the trick! Your not wrong about Moorebank, its a true test for a nitro car where gearing and everything has to be spot on!!!
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Old 04-27-2005, 05:55 AM   #7932
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Its also a track that will show up any weak point in a car......if theres something about to break in a car, you can be sure it`ll happen at Moorebank
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Old 04-28-2005, 03:41 AM   #7933
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Hey guys, got the RD logics pipe. Lost a bit of bottom end but gained heaps of top end! 2nd run down the straight, BANG, broke the crankshaft! . That is the last RB engine i will own! It's been nothing but trouble. Long live Novarossi!
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Old 04-28-2005, 04:09 AM   #7934
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Rody, which RB is this? The older X12 or the newer V12 model? I know the older RB X12 crankshafts are notorious for this...
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Old 04-28-2005, 04:22 AM   #7935
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It's a V12. I has only had aroung 7 litres of fuel through it (1.5 gallons or so), i've been through 2 rods, piston and liner, and now crankshaft! I take so much care of it, and only use it for racing and not bashing. I also never run it lean of hot!
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