Hey, hope everyone had a good start to the new year.

I would like to know about the chips/cards that i have seen mentioned every now and then. I know nothing about them. What are they used for? where are they? etc. etc.

Any info is good.
Thanks.
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Princey37

Right then;

The mc28 is restricted in 2 places;
1; The exhuast headers have large washers in to restrict the flow of exhaust gasses.
2; The ignition advance curve is more retarded than previous NSRs were.
and like all NSR's the airbox is too small to flow enough air for max power.

"1" is easily fixed, new pipes or grind the washers out.

"2" is fixed with a different "smartcard"*;

There were four commonly available HRC cards;

the "000" card was the original and for use with Avgas.
the "010" card was the updated "000" card.
the "020" card arrived with the "010" card and was for wet weather, both where for Avgas.
the "030" card was for normal unleaded pump fuel.

HRC no longer make these cards and they are individually code to the CDI so unless someone in Japan has contacts who say otherwise they are no longer available new.

None the HRC cards work if there is any signal from the sidestand, oil level indicator or neutral switch.
This means you either need to use the HRC wireing harness which means no road kit at all (no lights of any form, no steering lock) or modify the stock loom to cut those signals out.
The HRC card also turns the speedo into a big temperature gauge and removes all other LCD display functions.

Contrary to popular rumour the stock card does work still with either the race loom or a modified road loom. But as the HRC card makes large changes to the ignition advance the jetting on the bike will need changing so you can't swap one card to the other easily.
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Last edited by fontyyy on Thu Jan 08, 2009 6:30 pm; edited 1 time in total

Fontyyy, I've heard before that the MC28 cylinder has more conservative exhaust porting than the MC21? Do you know to what degree?

Honda have superseeded all the MC21 cylinder part numbers to a MC28 part number, just one size - 'A'.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30

Fontyyy just make a very good explication (explain)

Regards

RichG wrote:Fontyyy, I've heard before that the MC28 cylinder has more conservative exhaust porting than the MC21? Do you know to what degree?

Whatever degree it is it's either less than you can measure or less than production tollerances.
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It was only a matter of time before Honda started using the MC28 barrel as a replacement for the MC21 as they are so close to being the same.

I thought I had a port map of a MC21 vs MC28 that myself and Andy did years ago but can only find MC18 and MC21 ones right now.

I might have to do another to show the difference and send it up to Andy to scan.
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If I have to take the carbs off once more...

So are we saying it's impossible to get 'full power' out of a road going MC28 with working lights, speedo etc regardless of which smartcard is fitted?

Nope, no-one's saying that.

Fontyyyy said, with a little editing "None the HRC cards work if there is any signal from the sidestand, oil level indicator or neutral switch. This means you either need to use the HRC wiring harness, which means no road kit at all (no lights of any form, no steering lock), or modify the [stock] loom to cut those signals out [to the HRC card]."
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Andy.
NSR-WORLD.COM

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So these cards are able to control the bikes performance??? Where abouts are they located and how do they control the bike?
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Princey37

Slightly off topic

I havn't ever worked on a MC28, so please excuse my ignorance, but are they a magnetic type card simular to a credit card ?

Has anyone tryed to 'copy' a card using a card scanner ? Its technology from the early 90's, so surely there must be a way to copy them this day and age.
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Andy.
NSR-WORLD.COM

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Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

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So they have a (read on memory) circuit board that has the ingnition maps programmed into it, and the PGM4 reads the card opposed to accually having the maps loaded on the ECU itself ?

So without the card, the ECU is technically incomplete.

I was thinking they worked on having 4 or so maps set in the ECU, and the card just set which one was to be used.
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So to get 'full power'. HRC card, wiring loom mods. exhaust and airbox mods?

and are the HRC cards still available given that they need to be coded to the PGM?

Plus a HRC carb kit.
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If I have to take the carbs off once more...

Watervillian wrote:So to get 'full power'. HRC card, wiring loom mods. exhaust and airbox mods?

and are the HRC cards still available given that they need to be coded to the PGM?

Buy whilst you can!!! http://www.nsr250.net/forums/viewtopic.php?t=7066
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30