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Polarbear
Familiar Member
United Kingdom
314 Posts |
 Posted - 21/10/2007 : 15:41:56
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| im seriously thinkin about movin onto a straight four like an fzr where its easy to get more power. i know half of you are going to say:just get a bigger bike, but i want to stay with the retro flingable 400 look. the mods on my bike are below listed below as usual. but everytime i carry out a new mod im happy for a few months, then hear about these flat fours that make my bike look like its reached its full potential and thats the end of the line, wont get any more out of it. id love to get a 444 conversion but last time i checked your talking £3000 plus!! HELP ME!!! |
The Polarbear. Bringing motogp to the open roads:) |
Edited by - Polarbear on 21/10/2007 15:43:47 |
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billybilboa
Familiar Member
United Kingdom
400 Posts |
Posted - 21/10/2007 : 16:36:38
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Yea but nothing on your sig list other than your jet kit upgrade and the scorpion exhaust will give you anymore power. At the end of the day to get massive bhp gains on a VFR you'll have to pay through the nose for it, enjoy what you've got or move on...
Billy |
Black & White '89 NC30 Track Bike & Scorched Yellow '56 Triumph 675 Road Bike....Rain bad...very bad, Billy |
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crm250
Roll on may
United Kingdom
4821 Posts |
Posted - 21/10/2007 : 16:38:11
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it is quite true and the FZR's and ZXR's seem to have the jump in power / speed over the V4's however tuning a 400 can result in a shorter lifespan in the motor.
why not make a 400 / 600 hybrid ? i would love to try a gullarm with a 600 motor grafted in
why not keep the 400 and buy another bike to satisfy the craving, very quickly often you will appreciate the benfits of the little NC |
CRM in "sold a bike" shocker |
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viper_biker
Administrator
Ireland
7563 Posts |
Posted - 21/10/2007 : 17:13:31
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From looking at your sidnature, there is nothing there that will increase your power. A can and jet kit will get you an extra 1 or 2 bhp, that's it, there are no other mods there that will improve the power of the engine. Ditch the standard system and try and get a Japanese race system (it just so happens I have one of the most popular system for sale), then, look at your carbs and air-box. My bike runs a Yamamoto twin stack, HRC air-scoop, no snorkel on the airbox, shimmed the airbox up by 1mm to increase a little more volume of air in the air-box, K+N air filter (these are no longer available, but a new OE filter will do the same job), RVF carbs with 115 jets all round (RVF and VFR carbs are quite different) and removed the breather that ran from the rear head back into the air-box with a little K+N filter also.
I think that's all the mods I've done to change a little bit of power and I'll be doing to a dyno soon whici will tell me if it was at all worth it. It's really down to how much you want to spend, the mods I have done above are about £1000 worth and I don't really expect to get much more power. If I'm not mistaken the 444 conversion is no longer available but the 433 is, and is more reliable (Rick Oliver has recently bought back the bike he did this to a few years ago and it's still going strong). It's all really down to money, time and finding the parts, personally, I recommend you to buy a bigger bike if it's more hp your after. |
Social worker: "Glen honey, I got a question for you. What do you do for a living?
Quagmire: "I got a question for you. Why are you still here?" |
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Polarbear
Familiar Member
United Kingdom
314 Posts |
Posted - 21/10/2007 : 17:15:08
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very true crm 250, i noticed a guy on the cbr general chat forum appears to be sellin one, ive asked him for details, think theres a guy called graeme france on the cbr forums that recommends against the 600 conv and for about £1500 can tune a std cbr400rr to the 80+ hp mark. hmmm possibilities. plus bilibilboa is right about the jet kit mod being the only power gain increase but nearly all the mods ive carried out on mine do increase overall performance.
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The Polarbear. Bringing motogp to the open roads:) |
Edited by - Polarbear on 22/10/2007 06:02:45 |
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Graeme France
Senior Member
United Kingdom
2129 Posts |
Posted - 21/10/2007 : 18:06:49
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70 ish BHP is our best so far on a 399 CBR400 !!
Graeme |
Meiling Li
Director
France and Li Asia Trading
Tel 07778 628448
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Polarbear
Familiar Member
United Kingdom
314 Posts |
Posted - 21/10/2007 : 18:29:47
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| lol, hi graeme, and howe many pesos would that cost roughly? seriously thinkin about it. unless theres a similar way of squeezin that out of the vfr400? |
The Polarbear. Bringing motogp to the open roads:) |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 21/10/2007 : 21:41:35
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Your engine is virtually standard polarbear.
A good exhaust system will give it much better midrange power, then just throw some money at RLR, 75hp is realistic with the right money, gear it right and it will be an animal. |
I DUG the underground! |
Edited by - Cammo on 21/10/2007 22:28:36 |
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hannakournikova
Senior Member
Ireland
1787 Posts |
Posted - 21/10/2007 : 22:30:56
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to be honest, and im sure most people will agree, a decent bike with decent hp - 60+ is fine for the road, system, jetted to suit, sharper brakes, etc and you will be happy enough.
its when you start tracking it that you want big HP gains, to win races etc, a 75bhp nc30 roadbike covered in "trick" tat will surely be not better Power VS Pennies than well set up "standardish" bike??? |
If you run bollock naked through town with a dildo hanging out your hole you'll turn heads too... |
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Polarbear
Familiar Member
United Kingdom
314 Posts |
Posted - 22/10/2007 : 06:01:16
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| so since the bore out has dropped to 433 rather thatn 444, will that make it any cheaper. i think ive seen ricks one he bought back, v nice, the red one if im not mistaken. also is it any easier to do labour wise? |
The Polarbear. Bringing motogp to the open roads:) |
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Royster81
Left handed surfer
Ireland
3914 Posts |
Posted - 22/10/2007 : 09:42:50
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quote:
Originally posted by Graeme France
70 ish BHP is our best so far on a 399 CBR400!!Graeme
i'd say thats pretty *Censored*g respectible from a 399cc motor!
quote:
Originally posted by Polarbear
so since the bore out has dropped to 433 rather thatn 444, will that make it any cheaper. i think ive seen ricks one he bought back, v nice, the red one if im not mistaken.
i think,and don't hold me to this,an other member build one not so long ago to the tune of £800 all in,i think i remember reading that somewhere.
the kit costs £400,then the barrel hone,rebuild and new parts needed,i think it could be done for that,you possibly could do a lot of work yourself if you know "how to adjust a chain on an nc30" and at the end on it you'd have a pretty special bike that you don't see too often,even on a 400 forum
tbh i'd of though more people would be doing it..... |
400R,loud proud and modified. |
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Polarbear
Familiar Member
United Kingdom
314 Posts |
Posted - 22/10/2007 : 17:17:06
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wow, didnt realise it was that cheap, id be willing to spend £800 and obviously pay someone to fit it for me. those of you who know me will also know that im crap with a spanner (if i had one).
didnt notice you edited your earlier reply viper, soz man, sounds like good stuff, would be good to see what its puttin out, how much would you want for the full sys? might be interested. |
The Polarbear. Bringing motogp to the open roads:) |
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viper_biker
Administrator
Ireland
7563 Posts |
Posted - 22/10/2007 : 17:36:49
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quote:
Originally posted by Polarbear
didnt notice you edited your earlier reply viper, soz man, sounds like good stuff, would be good to see what its puttin out, how much would you want for the full sys? might be interested.
Sorry Polerbear, my post wasn't edited (on edited post would actually say 'edited' below the main post) It's not a full system I have, it's a 1/2 system made by a company called Ethos (regarded as a quality system by 400 owners) and all the details are in the 'For Sale' section (I think it's on page 2 now) and the price is £250. If you do go down the 433 conversion, you WILL need at least a half system as a stock system and an end-can will not get you the best power out of the motor. HTH. |
Social worker: "Glen honey, I got a question for you. What do you do for a living?
Quagmire: "I got a question for you. Why are you still here?" |
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Polarbear
Familiar Member
United Kingdom
314 Posts |
Posted - 23/10/2007 : 19:13:09
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| think ill pass on the half sys mate, thanks anyway. if im to go ahoead with an exh sys and the 433 upgrade id rather hand it to a pro and have it all done at once in a package rather than bits and pieces........and when money allows. really interested in the mods you mentioned earlier in the discussion, nice work. wouldnt mind finding a bit more out on this RLR place cammo mentioned earlier. |
The Polarbear. Bringing motogp to the open roads:) |
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viper_biker
Administrator
Ireland
7563 Posts |
Posted - 23/10/2007 : 19:36:11
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| RLR are known to get good results, but expect to pay mega money (I'm talking £3/4k) their exhausts are about £1000 alone iirc. If it were me I'd sooner fit a Jap system. RLR engines are maily track bikes as well, and a re-fresh will cost another £1200 or so. With those figures in mind, I'd start looking at a bigger bike. |
Social worker: "Glen honey, I got a question for you. What do you do for a living?
Quagmire: "I got a question for you. Why are you still here?" |
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Polarbear
Familiar Member
United Kingdom
314 Posts |
Posted - 23/10/2007 : 21:14:05
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| er....yeah....you may have a point there, serious pesos. although id still be interested to see what hp your is puttin out. those are mods within my reach and look worthwhile. |
The Polarbear. Bringing motogp to the open roads:) |
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viper_biker
Administrator
Ireland
7563 Posts |
Posted - 23/10/2007 : 21:51:54
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I don't think what I have done is greatly special, and certainly not a 'Specialist' modification, but here's a few pics of how it looks underneath,
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Social worker: "Glen honey, I got a question for you. What do you do for a living?
Quagmire: "I got a question for you. Why are you still here?" |
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billybilboa
Familiar Member
United Kingdom
400 Posts |
Posted - 23/10/2007 : 22:24:42
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Is the carbon tray purely to stop the heat from the engine getting to the carbs and to channel fresh air to them thus giving the carbs cooler cleaner air? When fitted do you need to mod the airbox aswell?
Billy |
Black & White '89 NC30 Track Bike & Scorched Yellow '56 Triumph 675 Road Bike....Rain bad...very bad, Billy |
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CMSMJ1
Forum Veteran
United Kingdom
3623 Posts |
Posted - 24/10/2007 : 00:18:05
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| yes, yes and no billy |
89 NC30 my mate Number 9
IMPERATOR REX ANGLORUM |
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billybilboa
Familiar Member
United Kingdom
400 Posts |
Posted - 24/10/2007 : 08:08:19
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Is it a worthwhile mod for trackday use? I'm a novice at bike mechanics and my knowledge of what not and what to do in terms of worthy modifications is limited, so I'm starting from the ground up. Plus I now have a garage which has spured me on to do work on the bikes myself.
Billy |
Black & White '89 NC30 Track Bike & Scorched Yellow '56 Triumph 675 Road Bike....Rain bad...very bad, Billy |
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viper_biker
Administrator
Ireland
7563 Posts |
Posted - 24/10/2007 : 11:01:54
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| Billy, I have the exact same mods done to my own track bike but not the RVF carbs and it works well. There are VFR carbs in there with a completely different set-up, but you'll go quicker round the track with a new suspension and stock set-up than you will be trying to raise the HP and still not hold a line in the corners. |
Social worker: "Glen honey, I got a question for you. What do you do for a living?
Quagmire: "I got a question for you. Why are you still here?" |
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