Author Topic: Dyno graph reading (Read 9501 times)

darrsi · « **on:** 29 September 2012, 10:55:39 am »

Here's a graph of a Dyno reading for my 2000 SP 600.(2 years ago)
The lower line was from when the bike had a hesitation/stutter issue on harder acceleration/overtaking, so i had the bike in for investigation which ended up as a carb overhaul, but the problem actually turned out to be number 2 carb inlet rubber that had folded in on itself on reassembly after having the cam chain replaced at another bike shop.
Even though i took the bike back several times to the shop, 3 of them rode it and refused to acknowledge that there was a problem, which as you can imagine made my blood boil a bit, but what could i do?
So i took it to PDQ and after taking the carbs off he noticed the offending inlet rubber that had been folded in half by about 10mm and then tightened up, so it was just letting too much air in when a bit of power was needed.
Obviously the upper line on the graph is when everything was sorted.
That turned out to be a very expensive month for me

On this graph i had a Quill unbaffled race can on at the time, with a standard paper air filter, and i have an unknown make of replacement stainless downpipes, although they're probably Delkevic.
I now have an SP Engineering Moto GP end can, which is shorter, and i leave it baffled due to noise and unwanted police attention, and a K&N air filter fitted, and after having the bike Dyno'd again last week it had dropped by about 0.5bhp, which i think is expected anyway due to wear and tear, and age.(the bike, not me

)

scottyboy2203 · « **Reply #1 on:** 29 September 2012, 03:47:58 pm »

Thanks Darrsi that is really interesting for a sad git (engineer) like me! So the standard filter and unbaffled can was better? Sounds sensible to me. Can't believe how flat that torque curve is above 8K, lovely engine!

darrsi · « **Reply #2 on:** 29 September 2012, 05:06:49 pm »

The Quill was just a straight through can, it never had a baffle.

The Moto GP exhaust is just a bit too noisy to chance removing the baffle 'cos i just know i'll get pulled for it.
It's also got British Standard markings on it so is fully legal with the baffle in.

red98 · « **Reply #3 on:** 30 September 2012, 08:24:24 am »

thanks for sharing that DARRSI very interesting

.........if all else fails with my stuttering fzs600 i might give them a call

,not far from me as iam in high wycombe.......are you local ?

darrsi · « **Reply #4 on:** 30 September 2012, 12:44:13 pm »

Harrow

red98 · « **Reply #5 on:** 30 September 2012, 01:32:03 pm »

Quote from: darrsi on 30 September 2012, 12:44:13 pm

Harrow

do you get up to the ace much

Paul · « **Reply #6 on:** 30 September 2012, 01:43:44 pm »

Some stainless steel headers don't offer enough back pressure, Motad for instance; and you need to sleeve them down at the collector point.

The Motad collector pipe measures 1364sqm whereas the original collector has an open area of 962sqm (based on a 2mm wall thickness) at its pinch point.

You can see where the original back pressure adjustment (pinch point) was made point on the standard header pipes collector point.

darrsi · « **Reply #7 on:** 30 September 2012, 05:31:27 pm »

You're not gonna believe this, but i worked in the road behind the Ace Cafe for 4 years, before relocating to Greenford next to the A40 for the next 14 years, and i've still never been there!!!

red98 · « **Reply #8 on:** 01 October 2012, 06:51:19 am »

Quote from: darrsi on 30 September 2012, 05:31:27 pm

You're not gonna believe this, but i worked in the road behind the Ace Cafe for 4 years, before relocating to Greenford next to the A40 for the next 14 years, and i've still never been there!!!

great meeting place

iam up there on sunday with a few friends (if all goes well) hornet day $:\$ i know what your thinking

mates got one,probs have to wait for him to catch up a few times and also several stops for fuel

[size=78%] [/size]

wraith600 · « **Reply #9 on:** 01 October 2012, 11:14:49 am »

hi gys this is the last dyno one i had done / also live 5 min from the ace and never go there as normaly just meet dick heads who aint interested in some one riding a 98 even if it it heavy modded like mine

Jamieg285 · « **Reply #10 on:** 01 October 2012, 01:07:25 pm »

Thanks for the graphs guys. Very interesting, and not at all what I was expecting.

They really have produced a great engine there.

darrsi · « **Reply #11 on:** 01 October 2012, 01:13:59 pm »

@wraith600, what have you had done to keep your BHP so high on a 14yr old bike?

wraith600 · « **Reply #12 on:** 02 October 2012, 07:54:36 am »

hardley use it + 30 years of modding bikes

thom_1991 · « **Reply #13 on:** 07 October 2012, 05:03:27 pm »

Don't you have a Micron race system. Anything else? Needles/jets fiddled with?

@ darrsi did you not get an AFr trace?

darrsi · « **Reply #14 on:** 07 October 2012, 06:27:20 pm »

If i knew what that was i'd let you know?

thom_1991 · « **Reply #15 on:** 08 October 2012, 08:48:51 am »

Lol sorry the air fuel ratio trace. Showing you whether its rich or lean at whatever point in the rev range.

darrsi · « **Reply #16 on:** 08 October 2012, 11:21:11 am »

No then, just the torque and bhp as in what's showing on the graph

I'm still interested as to how 'wraith600' graph has 152mph written on it, on a bike that's advertised to do 140mph max from brand new, and only peaking at 10,300rpm?

thom_1991 · « **Reply #17 on:** 08 October 2012, 06:23:54 pm »

Theoretical speed as its only spinning up the dyno drum in top gear. Also he has a rare as rocking horse Micron race system (wish i could find one) and some other bits if i remember rightly. You got me stumped on the rev limit though. Wraith?

wraith600 · « **Reply #18 on:** 10 October 2012, 07:58:41 am »

revs out at 11500 carbs have been dynojeted with a k&n filter and a cut down performance racing parts can with the mentioned micron pipework and the addition of a g pack 0/40 oil and a heavy duty clutch springs with kevlar plates and thats about it at the moment

doing a HID head light mod with 2 complete light units now but having motavatonal issues basicley cant be assed when i get it done

more exhaust mods and some airbox / intake mods and maybe a gasflow

darrsi · « **Reply #19 on:** 10 October 2012, 10:50:16 am »

That lot could be responsible then........nicely done

thom_1991 · « **Reply #20 on:** 10 October 2012, 06:13:10 pm »

Where did you get the Micron Pipes? And did you notice any difference with the G pack? I'm struggling to see anything on the wiring diagram that relays information to the CDI or anywhere about what gear the bike is in....

wraith600 · « **Reply #21 on:** 15 October 2012, 02:02:00 pm »

the pipes i bought in 98 the Gpack only verry small chance mainly in midrange no idea about the way it works mabey modify the signals to the cdi right through the rev range

Will.I.Is · « **Reply #22 on:** 25 October 2012, 03:27:23 pm »

Hi, my fazer is 2001 at 47,700 miles fuelling needs setting up and there was a clutch slip, with that sorted I should be looking near 90bhp, Bike has stainless downpipes and a beowolf can with a K&N filter.