SP2 TBs and injectectors on SP1? - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 10 (permalink) Old 02-22-2012, 12:52 AM Thread Starter
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SP2 TBs and injectectors on SP1?

is this a good mod? does it work as long as you have a power commander etc to retune with for any differences? or is more involved and not really worth the effort? I wonder becuase the larger TBs and more hole injectors yeild better atomization supposedly? TBs with injectors can be had relatively cheap on Ebay?

or for the matter maybe just an injector swap for better MPG??

Sorry if this is an topic. just couldn't help but wonder.. and didn't do a search.

Current steeds: 2000 RC51 SP1, 2002 KTM 520EXC, 2001 YZ250f
Road bikes I used to own: '03 Bandit 1200s, '02 ZZR1200, '00 Guzzi V11 Sport, '97 H-D 1200c sportster (don't judge me).

"If you don't stand for something, you will fall for anything".
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post #2 of 10 (permalink) Old 02-22-2012, 01:09 AM
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I did the mod and it is quite good......check it out

https://www.rc51forums.com/forums/showthread.php?t=6033

You will need the whole SP2 package though
1) TBs
2) ECM
3) Air box

I got them from Ben here for a real bargain!


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post #3 of 10 (permalink) Old 02-22-2012, 12:11 PM
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I read a post somewhere that a dyno revealed the smaller SP1's TB's where better for the street (more mid range torque then the SP2's)

2000 VTRSP1
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post #4 of 10 (permalink) Old 02-22-2012, 01:31 PM
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I read a post somewhere that a dyno revealed the smaller SP1's TB's where better for the street (more mid range torque then the SP2's)
That is totally correct.

Makis, post up your before and after dyno charts from where you switched to the SP2 throttle bodies and harness.
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post #5 of 10 (permalink) Old 02-22-2012, 03:26 PM
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That is totally correct.

Makis, post up your before and after dyno charts from where you switched to the SP2 throttle bodies and harness.
Unfortunately I haven't take her to the dyno yet.
The closest dealer with a dyno is in 120km from my place and I haven't finished with the PC mapping yet.


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post #6 of 10 (permalink) Old 02-24-2012, 12:22 AM Thread Starter
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i see.
So the SP2 TBs yeild more top end where the SP1s have better mid range? For my riding style i think i could use the mid range power more. i think i'll be sticking with the SP1 TBs then.

What about just an injector swap. is that possible? to get the 12 hole injectors for possibly better atomization= + MPG./POWER?

would still be interested in that dyno run though Makis when you get time for a tune.

Current steeds: 2000 RC51 SP1, 2002 KTM 520EXC, 2001 YZ250f
Road bikes I used to own: '03 Bandit 1200s, '02 ZZR1200, '00 Guzzi V11 Sport, '97 H-D 1200c sportster (don't judge me).

"If you don't stand for something, you will fall for anything".
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post #7 of 10 (permalink) Old 02-24-2012, 07:05 AM
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Originally Posted by mondo View Post
I read a post somewhere that a dyno revealed the smaller SP1's TB's where better for the street (more mid range torque then the SP2's)
http://www.speedzilla.com/forums/hon...tml#post545478

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post #8 of 10 (permalink) Old 02-25-2012, 12:48 AM Thread Starter
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great info waldo. that pretty much sums it up. awesome to know that 150 rwhp is achievable with the SP1 tbs, that is definetly a good thing.
I love how this motor seems to respond well to a few key mods.

Current steeds: 2000 RC51 SP1, 2002 KTM 520EXC, 2001 YZ250f
Road bikes I used to own: '03 Bandit 1200s, '02 ZZR1200, '00 Guzzi V11 Sport, '97 H-D 1200c sportster (don't judge me).

"If you don't stand for something, you will fall for anything".
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post #9 of 10 (permalink) Old 02-25-2012, 01:00 AM
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Originally Posted by dnsducks View Post
i see.
So the SP2 TBs yeild more top end where the SP1s have better mid range? For my riding style i think i could use the mid range power more. i think i'll be sticking with the SP1 TBs then.

What about just an injector swap. is that possible? to get the 12 hole injectors for possibly better atomization= + MPG./POWER?

would still be interested in that dyno run though Makis when you get time for a tune.
I have tried the injector swap, well its not just a straight swap as custom seats have to be used, I did not have it dyno tuned, but my seat of pants dyno felt no difference. link below

http://www.fireblades.org/forums/hon...-into-sp1.html

2000 VTRSP1

Last edited by mondo; 02-25-2012 at 01:28 AM.
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post #10 of 10 (permalink) Old 02-25-2012, 08:54 PM Thread Starter
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good post mondo thanks.
that puts it into some perspective. it would be great if there was tuned dyno runs to actually go along with swap but i guess you can have it all...

the only reason i suggested it was because one would think that injectors with more holes would be better for atomization. the end result being better MPG with no drop off in power. I am not concered whatsoever with the power production of this MC. more that anything i only ask becuase of the documented fueling issues on/off throttle and mid corner acceleration. FUEL mpg and range..oh and... i HATE snatchy throttle action. hate it. did i say, and make clear enough that i hate it. yes i hate it. nothing worse than trying to roll the throttle back on mid corner and get a hesitation,..flatness or the ultimate sacrelige.. nothing nothing.. blam !hate it. firicken hate it.
ok i am done with the hate. fwiw I was favoring CV carbs for a while before FI simply becuase it seemed so many bikes had the .. SNATCH when FI was becoming mainstream. sorry digressiing...

But it sounds like any issues can be tuned out with the PC3. so that is good. I have one on order... YES!!! lovin me some tax returns.... whooohooo
happy days...

Current steeds: 2000 RC51 SP1, 2002 KTM 520EXC, 2001 YZ250f
Road bikes I used to own: '03 Bandit 1200s, '02 ZZR1200, '00 Guzzi V11 Sport, '97 H-D 1200c sportster (don't judge me).

"If you don't stand for something, you will fall for anything".

Last edited by dnsducks; 02-25-2012 at 08:57 PM.
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