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  Topic Review (Newest First)
05-26-2010 02:58 PM
SubSailor
Quote:
Originally Posted by 51'er View Post
So, im logging more internet time doin research on the 51, (while getting paid). I ran across these other guys that talk about engine mods and upgrades JE Pistons, lightened crank, Carillo rods, Moriwaki Stage II cams and HRC springs, Moriwaki airbox.... My question is... (and this might be stupid) but wont the ECM pick up on these radical changes and then what, disable it, re-map it... Im almost sure these mechanical alterations would throw the FI light on.. the computer would be trying to correct a problem thats not actually there.. what to do here?
The ECU only cares about it's sensor inputs and calculates fuel timing based on it's mapping.
By using a power commander, you alter the fuel timing map to compensate for additional air flow at a given RPM and throttle setting.
There's no need to use Carillo rods if you're using the stock 10.2K redline.
The high-compression pistons with stock valves will only yield about 11.4:1 compression. With HRC valves the compression will then jump to 12.8:1 as the HRC valves don't have the reliefs under the valve head.
With higher lift, longer duration cams, the effective compression ratio will fall slightly at idle due to overlap so the effective compression ratio may not be exactly 12.8:1 except at higher RPM. So it may run ok on the street with 93 octane pump gas.
To run the Moriwaki Stage 2 (or Kent) cams, you'll need to replace the valve springs, retainers, and seats with HRC items.
05-26-2010 02:38 PM
51'er Grunt, i agree with you 100%, and the likely hood of me actually dumping the cash into this baby is not really good. I love the way this bike is, from twisties to the throttle response it has. My buddy has a 05' ZX10 and I dont feel like i have half as much control (that and im bias twards HONDAS) Ever since the dirt bike days, its always been a honda.. whoops, i guess i can tag in one 98 R6... but hey, everyone needs a mulligan for mistakes..LOL.. I like the idea of removing the cam silencing gear and overall losing weight there. but yea, the only thing that would make this baby even more sick is to pull the clutch in and hear this baby lopeing at an intersection...
05-26-2010 02:11 PM
grunt12380 Best thing to do would be to dyno it and retune the ecu. Maybe even change the timing since so much would be done to the eternals. I don't really see the need in all of that. So much money would be needed, when for one it is fast enough and the newer liter bikes are just as good or better. But I still love my RC!
05-26-2010 11:36 AM
51'er
Motor work... to do or not to do? that is the ?

So, im logging more internet time doin research on the 51, (while getting paid). I ran across these other guys that talk about engine mods and upgrades JE Pistons, lightened crank, Carillo rods, Moriwaki Stage II cams and HRC springs, Moriwaki airbox.... My question is... (and this might be stupid) but wont the ECM pick up on these radical changes and then what, disable it, re-map it... Im almost sure these mechanical alterations would throw the FI light on.. the computer would be trying to correct a problem thats not actually there.. what to do here?
05-26-2010 04:37 AM
grunt12380
Quote:
Originally Posted by SubSailor View Post
So I'm guessing over-population finally ended the drag strip/race track towards Barbers Point?
I used to go there quite often to watch the guys race their bikes in the late 70's.
Ever taken your RC51 up Tantalus drive? That should stretch you bike's cooling system to the max on the up hill section.
There's another similar road over towards Makaha that goes through the Naval comm station and over the mountain and dumps into Scholfield Barracks.
Both of the those roads will have you parking your bike at the peak to cool off from all those 1st and 2nd gear twisties.
Subsailor I think you are talking about KoleKole pass. Which is gated and only open on hours when people are going to or from work. I been on it once. Going down it will definitely keep you on edge. There is a road called "13 turns" that I will ride this weekend.
05-24-2010 11:29 PM
SubSailor
Quote:
Originally Posted by 51'er View Post
What tooth ratio do you run on the RC51, i was thinking that a 16-41 would make it smoother in town. Any suggustions on that.. I have not put this baby on the track, mostly just 12:00's intown and twisties.. Its just a clutchy pain riding it in town.. looking for help here...
I run 15/41 on mine. Others also run 15/42 or 15/43.
05-24-2010 11:24 PM
SubSailor
Quote:
Originally Posted by 51'er View Post
Yea, Im finding out that shes a b‼tch to cruise town with.. But none the less those twin Yoshi cannons sound so good when I get in her... I think i'll be picking up another bike very shortly. And i stand corrected on the post, its not a Yoshi PC, its an EMS. Theres a cheap set of rubber on it now. Back tire just does not grip when i slip the clutch @ 4k.. JUNK!!! I'll have to get a new front gear this week. .... OK. heres a silly question. The air intake duct, there is a flapper on top of it connected to a vacuum line, (see, mines loose in there and does not seat in the intake duck like its supposed to. The damn thing jumps around when i goose it) I read that if you remove that so the flapper stays open all the time, it generates better air flow and in turn, more HP.. anyone verify this? Heres where i read it from.. http://www.rc51.org/valve.htm. Check it out, let me know what you guys think.. Thanks
It causes a dip in the torque curve. It's only purpose was to damp intake noise. Probably at the RPMs used during EPA sound checks I'm guessing.
You can disable it and remove all the hardware used and save a few pounds plus some needless complexity.
05-24-2010 11:16 PM
SubSailor
Quote:
Originally Posted by grunt12380 View Post
You got a great deal on that bike! I got an '01 basically stock for 4k. Anyway as far as tires go. If you want traction I got continental motion on my gsxr and they hold great. As for the RC I got continental attack. They don't grip as good but I get more mileage out of them than the motions. I ride the RC more and there isn't a track on Oahu, so it makes sense for me.
So I'm guessing over-population finally ended the drag strip/race track towards Barbers Point?
I used to go there quite often to watch the guys race their bikes in the late 70's.
Ever taken your RC51 up Tantalus drive? That should stretch you bike's cooling system to the max on the up hill section.
There's another similar road over towards Makaha that goes through the Naval comm station and over the mountain and dumps into Scholfield Barracks.
Both of the those roads will have you parking your bike at the peak to cool off from all those 1st and 2nd gear twisties.
05-24-2010 08:42 PM
erick1670
Quote:
Originally Posted by 51'er View Post
What tooth ratio do you run on the RC51, i was thinking that a 16-41 would make it smoother in town. Any suggustions on that.. I have not put this baby on the track, mostly just 12:00's intown and twisties.. Its just a clutchy pain riding it in town.. looking for help here...
16 front, 42 rear
05-24-2010 01:06 PM
51'er
Quote:
Originally Posted by erick1670 View Post
You have to disconect the hose then unscrew the flapper and play with it until you see the flapper stay open when you screw the valve on close....hope that helps
What tooth ratio do you run on the RC51, i was thinking that a 16-41 would make it smoother in town. Any suggustions on that.. I have not put this baby on the track, mostly just 12:00's intown and twisties.. Its just a clutchy pain riding it in town.. looking for help here...
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