power for pound......one for the nc30/35 racers

[royster81]

ok guys, i'm not looking to get big horse power from my track bike but i'm looking to do a few mods to help release whats there or maybe get the best from what i have.
i have been chatting to a few racers and they all seem to say the same things,system,jetting and loose some of the useless parts that aren't needed on the track,but i have been considering things like ram air,taking the flywheel off (if not removing it maybe a lighter one) chrisxr's programmable cdi's and the like...

so i'm really looking advice from what you guys the racers have done,what sort of benefits it's given and what you'd consider to be a plus for a track bike or something to leave well alone unless i wanna rebuild it every other year

i know some will say sort the suspension and stick tyres and you're good to go but i'm looking real advice but common sense...

[randallbass]

on my track bike so far im running
a full race exhaust
160 main jets all round with an open airbox setup
modified fuel valve
stiffer front suspension

the jets and airbox setup makes a noticible difference to the wow factor and overall performance of the engine giving it more go :) but getting the suspension sorted is what u noticed gave me more confidence to brake alot later and tip in hard and fast and pick up and back on the gas :) and alot of guys i have spoken to have given the same advice they have spent lots of $$$$ on engine performance and taken 1-2 seconds off and then spent a couple of hundred $$ on suspension setup and tuning and wiped off over 5 seconds lolz and i can now back that up and say its true :) :)

although in Australia the NSW 400cc 4 cyl 4 stroke class you are limited to the modifications you can do the bike like most parts have to remain the same of be of the same era like brakes and suspension so yer were limited to the things we can change but keeps the cost down i guess :)

hope that helped mn
cheers Tim

[tanuki]

mate I know my trackbike is a 29 but..

Full System
HRC CDI
Ram Air

I have run it total loss as well and will do again shortly and did notice it spins up quicker but will not give you any more power its just less rotating mass.

I am about to have David Simon rebuild an engine for me with some different gears and a skimmed head which will raise the compression which is basically a mild tune but without the need for a yearly rebuild.

and mate you know how I feel about jetting..getting the bike correctly set up by a decent dyno operator is worth its weight in gold

[Simon_Ed]

ive had the heads and blocked skimmed on my 35, heads ported and polished, pistons balanced, a full race system, total loss system,all 4 bellmouths are short stacks, slightly bigger main jets, basically now i want to lose as much weight off the bike as possible, the bike is putting out 63bhp@ the back wheel,
might not sound a lot but its enough for a few top 4 finishes

Si :D :D :D :D

[tanuki]

for the amount of work its a pretty low output IMHO my RVF is totally standard other that full Ethos and HRC CDI, 4 short bellmouths and a days set up on the Dyno to get the fueling spot on and I am getting 66BHP.

[royster81]

mate I know my trackbike is a 29 but..
......dyno operator is worth its weight in gold

i hear what you saying mate,a dyno tune in is a must but before i do that i'm think something along the lines of what your doing,but this is where i require the advice,ok i could spend £1000's and get 70 horse,it'll be a weapon on the track,maybe even a top ten runner over here in the minitwin class but i'll probably waste it on the track,or i could spend £500 on mild tune and still have a quicker than standard bike which will keep me on my toes on the track but what state of tune can you get for £500,what would it entail to keep it reliable and whats the best mods for the price....

total loose, i was thinking off but i'm lazy,i like the starter and charge system which is why i'm looking into lightened flywheels
ram air,i was told this is one of ,if not the best mad to unlease the power in the bikes but feedback is hard to get ,local guys talk to you like it's top secret stuff or just say RLR did it ,i know nothing of whats inside,i just check the oil .....
head work,unsure of this tbh,don't think i'll afford it and it comes across to me as if it'll sway towards rebuilds,more of a high tune that a mild tune

[royster81]

ive had the heads and blocked.....
.....enough for a few top 4 finishes Si :D :D :D :D

i'm not going to ask you figures but would you consider it value for money ?
did you ride the bike before this work was carried out and was it a noticable difference ?

if you did it all again or had a tighter budget what would you do again,or what would be the one thing you'd do before doing the rest ?

[Morespeedvicar]

Sell RVF and buy a cbr600rr lol.............
Getting rid of as much weight as possible helps loads, something like Rick's alli subframe, thin race fairing and remove all redundent brackets. Why dont you run total loss ignition but keep the starter, and jump start it from a car( makes life a bit easier tho slighty more weight)?
Cheers
Ian

[Simon_Ed]

all in all i spent about 350 quid on tuning my engine, inc gaskets. My mate who i work with has been preparing race bikes for years and we did it cos we were bored and i wanted more power. Answer to the question about is it noticeable, yes its very noticeable cos the engine has more compression, and with everything else thats been done the engine feels that there is more torque and more mid-range. i also forgot to mention that the quietening gears have been removed.

[fat eddy]

Personnally I would say a decent race exhaust system & Ramair with jetting to suit, is the combination of upgrades that would give the best return. A word of caution, once you've got that far a couple of things worth considering is fitting a fuel pump & modifying the fuel tap to stop possible fuel starvation problems.

I'm a little further on from that point myself with maxton suspension, EBC cast disc's & some gas flowing done to the engine, and I would say that all upgrades have been worth having. Like you, I've only really been interested in doing things that give a siginificant change rather than get carried away with spending a fortune on something that I might not notice.

At this moment in time my engine is getting refreshed by chrisxr, once the bikes back together he's going to fit one of his programmable cdi's, as again this sound's like it could give a good return for the money, along with some dyno time to set-up.

Having said that, I did go a bit E-bay crazy a couple of weeks ago, bought some race radiators, CBR600rr calipers+ m/c, and a quick shifter.....

I let you know how it goes!!!