dyno tune questions - Wrist Twisters
 
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post #1 of 16 Old 04-05-2012, 11:39 AM Thread Starter
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dyno tune questions

im at 15000 miles and i got my pciii and wanted to go get a tune. my question is should i get a value job before the tune? and my tires are less then 1000 miles till they get replaced should i wait for that as well?

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post #2 of 16 Old 04-05-2012, 12:08 PM
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I'd ask the dudes at the dyno tune place, but I'll say no and no. Rarely are the valves out at 15000, and the tires won't get worn much on the dyno.

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post #3 of 16 Old 04-05-2012, 01:29 PM
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if anything get the dyno tune close to the end of the life of the rear.... which it sounds like you are. multiple dyno runs will definitely wear the tire some.

As far as valves. its good to check em around 15-16k but more than likely none will be out of spec.

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post #4 of 16 Old 04-05-2012, 01:31 PM
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i don't believe anyone has shimmed valves b4 29k miles

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post #5 of 16 Old 04-05-2012, 03:00 PM Thread Starter
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ok good to know thanks for all the quick responses guys, realy 29k!?!?

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post #6 of 16 Old 04-05-2012, 04:59 PM
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that's from memory, but i believe it's sumething close to that. and if i remember correctly it was 1-2 valves only.

hey senior members, anybody remember??

'04 Honda 919, Candy apple red met., 17/44t sprockets,f-16 windscreen,delkevic ss exhaust,Tharbars,givi engine bars, billet alum. led turns w/ running lights,red adj.levers from china, bar end mirrors,grip heaters,adj. foot peg brackets,adj. bar risers,dunlop Q2(that are better than your pp 2ct,lol)bike wired for gps and phone charger
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post #7 of 16 Old 04-05-2012, 05:07 PM
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https://www.wristtwisters.com/f94/val...eck-29112.html

https://www.wristtwisters.com/f94/919...vey-28920.html post #2 by marylandmike, #21, check out #28- 47k vavle check all in spec

https://www.wristtwisters.com/forums/...eck-26979.html

'04 Honda 919, Candy apple red met., 17/44t sprockets,f-16 windscreen,delkevic ss exhaust,Tharbars,givi engine bars, billet alum. led turns w/ running lights,red adj.levers from china, bar end mirrors,grip heaters,adj. foot peg brackets,adj. bar risers,dunlop Q2(that are better than your pp 2ct,lol)bike wired for gps and phone charger
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post #8 of 16 Old 04-05-2012, 05:39 PM
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I shimmed 2 intake valves at 32K. They were just a little on the tight side. Got another check at 48K coming this summer sometime.

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post #9 of 16 Old 04-05-2012, 06:01 PM
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Quote:
Originally Posted by Cotten Mouth Chris View Post
ok good to know thanks for all the quick responses guys, realy 29k!?!?
See it as a 919 cc car engine stuffed into a bike, then ask again about 29 K.

Seriously, your angst is being wasted.
Dyno it as it is, and seeing as it has as much tire as a litre SS bike, and you have street tires on the bike, how much wear do you think you'll get from the dyno work ?
How about next to nothing, and likely the only thing you'll see is surface evidence of the tire having been heavily loaded.
This coming from someone who has had a good number of runs done on a 919.

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post #10 of 16 Old 04-06-2012, 10:18 AM Thread Starter
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i was just thinking the the smaller circumstance of the tire might affect it im not to worried about waering them out like i siad their the next thing on my todo list

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post #11 of 16 Old 04-06-2012, 11:12 AM
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Quote:
Originally Posted by Cotten Mouth Chris View Post
i was just thinking the the smaller circumstance of the tire might affect it im not to worried about waering them out like i siad their the next thing on my todo list
If they did affect the readings who cares? it will by a small amount. And however you tune it will be good for whatever size tire is on there.

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post #12 of 16 Old 04-06-2012, 11:13 AM
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Quote:
Originally Posted by Cotten Mouth Chris View Post
i was just thinking the the smaller circumstance of the tire might affect it im not to worried about waering them out like i siad their the next thing on my todo list
No, be it full OD new with skinnier centre section or worn out flatter centre with smaller OD, is not going to have any effect at all on the mapping that gets done.
Whatever the tire loss effect is, is more driven by the tires air pressure.
Being a low HP bike, you can run the rear at 40 psi on the dyno and still maintain traction.
At least that way you know your tire losses are minimized.
Pickier still, is making sure your chain has been well cleaned and lubed.
A gummed up chain uses hp.

Check out 919.org (LDH's site, I'm pretty sure he another one, or is tied to another one, but I can't remember the name)
Look for the Dyno basics info.
Ignorance is not bliss, especially if some one gives you curves based on MPH instead of RPM.
Only accept RPM based curves.
You should get both Torque and HP curves, before and after type, all on the same page.
Make sure the peak torque and peak RPMs are noted, do not accept trying to read the curve lines down to the RPM axis.
Being PAIR equipped engines, the 919 is susceptible to spooked A/F readings from improperly blocked off PAIR air, be sure to ask about how they are going to block it off.
919s are large volume X small radiator area type cooling systems, and once the engine is up to temperature, it's very easy to have the coolant temp get out of hand if repeated runs are done with no inter-run cool down.
The needle should not get past half way, and if the fan goes on during a run, that run should be torched, otherwise you will have improper fueling when the coolant is at normal temperatures (the Honda ECU starts enrichening past a certain coolant temp and the PC does not change this).
Don't ask for a full power mapping, they are too rich for normal street use, engine responsiveness will likely suffer also, as full power fueling tends to feel "flat" at smaller throttle X lower RPM combos. If you want a track day map, there are plenty of those kicking around to try for free.

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post #13 of 16 Old 04-06-2012, 03:14 PM Thread Starter
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^ ok sounds good i got a pair blockoff plates installed already. the shop im going to was recommended by a good friend and my mechanic both said thats where everyone around these prts gets their bikes tuned(basically thats all these guys do).

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post #14 of 16 Old 04-09-2012, 02:54 PM
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Repeat: Do not do a dyno run on good (new) tires.

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post #15 of 16 Old 04-09-2012, 03:36 PM
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Quote:
Originally Posted by curiousmike View Post
Repeat: Do not do a dyno run on good (new) tires.
Wouldn't this scrub them in better than sand?

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post #16 of 16 Old 04-09-2012, 06:54 PM
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Quote:
Originally Posted by curiousmike View Post
Repeat: Do not do a dyno run on good (new) tires.
There is absolutely nothing wrong with doing 919 dyno runs with "good" tires.

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